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Greenhouse air temperature modelling

Cunha, José Boaventura; Oliveira, Paulo; Coelho, J.P.
Fonte: Instituto Politécnico de Bragança Publicador: Instituto Politécnico de Bragança
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
56.03%
This paper describes two implementation approaches for modelling the air temperature of an automated greenhouse located in the campus of the University of Trás-os- Montes e Alto Douro. Linear models, based in the discretization of the heat transfer physical laws, and non-linear neural networks models are used. These models are describes as functions of the outside climate and control actions performed for heating and cooling. Results are presented to illustrate the performance of each model in the simulation and prediction of the greenhouse air temperature. The data used to compute the simulation models was collected with a PC-based acquisition and control system using a sampling time interval of 1 minute.

Análises estatísticas das tendências de elevação nas séries anuais de temperatura mínima do ar no Estado de São Paulo; Statistical analysis of annual minimum air temperature trends in São Paulo State

BLAIN, Gabriel Constantino; PICOLI, Michelle Cristina Araujo; LULU, Jorge
Fonte: Instituto Agronômico de Campinas Publicador: Instituto Agronômico de Campinas
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
66.12%
Considerando que algumas investigações sobre o tema aquecimento global utilizam longas séries temporais de temperatura uma questão que deve ser levantada é relativa a influência de possíveis concentrações de fontes de calor urbano a que os postos meteorológicos possam estar submetidos. O primeiro passo para responder a essa questão é verificar se, em uma mesma região, ocorrem tendências concomitantes de elevação nos dados de temperatura em diversas localidades, possivelmente ligadas a fenômenos de escala global. Entretanto, se essa elevação tiver seu início em períodos bastante distintos entre as diversas localidades, o descarte de forçantes radioativas locais como principais responsáveis por esse aumento, dificilmente poderá ser realizado. O objetivo do trabalho foi detectar tendências de elevação nas séries anuais de temperatura mínima, bem como a data inicial dessas prováveis alterações, em seis localidades do Estado de São Paulo. A caracterização das séries foi realizada por meio da distribuição normal. O teste de Mann-Kendall não indicou tendências concomitantes nos dados anuais de temperatura mínima. Dessa forma, fatores de escala local parecem se sobrepor a fatores de escala global como principais forçantes radioativas causadoras do aumento médio dos valores da variável meteorológica sob investigação. Os resultados demonstram a necessidade de avaliar e/ou isolar fatores locais...

Relationships of Photosynthetic Photon Flux Density, air Temperature and Humidity with Tomato Leaf Diffusive Conductance and Temperature

Righi, Evandro Zanini; Buriol, Galileo Adeli; Angelocci, Luiz Roberto; Heldwein, Arno Bernardo; Tazzo, Ivonete Fatima
Fonte: INST TECNOLOGIA PARANA; CURITIBA-PARANA Publicador: INST TECNOLOGIA PARANA; CURITIBA-PARANA
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.15%
The objective was to study the leaf temperature (LT) and leaf diffusive vapor conductance (gs) responses to temperature, humidity and incident flux density of photosynthetically active photons (PPFD) of tomato plants grown without water restriction in a plastic greenhouse in Santa Maria, RS, Brazil. The plants were grown in substrate and irrigated daily. The gs was measured using a steady-state null-balance porometer on the abaxial face of the leaves during the daytime. Both leaf surfaces were measured in one day. The PPFD and LT were measured using the porometer. Leaf temperature was determined using an infrared thermometer, and air temperature and humidity were measured using a thermohygrograph. The leaves on the upper layer of the plants had higher gs than the lower layer. The relationship between the gs and PPFD was different for the two layers in the plants. A consistent relationship between the gs and atmospheric water demand was observed only in the lower layer. The LT tended to be lower than the air temperature. The mean value for the gs was 2.88 times higher on the abaxial than adaxial leaf surface.

Relationships of photosynthetic photon flux density, air temperature and humidity with tomato leaf diffusive conductance and temperature

Righi, Evandro Zanini; Buriol, Galileo Adeli; Angelocci, Luiz Roberto; Heldwein, Arno Bernardo; Tazzo, Ivonete Fátima
Fonte: Brazilian Archives of Biology and Technology Publicador: Brazilian Archives of Biology and Technology
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.15%
The objective was to study the leaf temperature (LT) and leaf diffusive vapor conductance (gs) responses to temperature, humidity and incident flux density of photosynthetically active photons (PPFD) of tomato plants grown without water restriction in a plastic greenhouse in Santa Maria, RS, Brazil. The plants were grown in substrate and irrigated daily. The gs was measured using a steady-state null-balance porometer on the abaxial face of the leaves during the daytime. Both leaf surfaces were measured in one day. The PPFD and LT were measured using the porometer. Leaf temperature was determined using an infrared thermometer, and air temperature and humidity were measured using a thermohygrograph. The leaves on the upper layer of the plants had higher gs than the lower layer. The relationship between the gs and PPFD was different for the two layers in the plants. A consistent relationship between the gs and atmospheric water demand was observed only in the lower layer. The LT tended to be lower than the air temperature. The mean value for the gs was 2.88 times higher on the abaxial than adaxial leaf surface.

Incertezas associadas à temperatura do ar no contexto das mudanças climáticas: determinação das causas e efeitos de heterogeneidades e discussão das implicações práticas; Uncertainties associated with the air temperature in the context of climate change: determination of the causes and effects of heterogeneities and discussion of the practical implications

Oliveira, Marcos José de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 08/10/2010 PT
Relevância na Pesquisa
66.2%
O registro da temperatura terrestre é um indicador fundamental nas análises de mudanças do clima global. A presente investigação tratou da verificação e quantificação dos efeitos de heterogeneidades (erros) em séries da temperatura do ar obtidas em estação climatológica localizada em Itirapina, SP, Brasil. As principais causas de heterogeneidades estudadas foram: mudanças dos horários de observação e cálculos da temperatura média diária; mudanças dos tipos de instrumentos utilizados (convencionais e automáticos) e mudanças nos abrigos meteorológicos. A metodologia aplicada consistiu em comparar, em diferentes escalas temporais, várias séries de temperatura do ar em relação a uma série de referência, assumida como mais confiável. As diferenças obtidas, em termos de desvios, resultaram em valores nas seguintes ordens de grandeza, de acordo com cada escala: 10,0ºC na escala das medições horárias; 5,0ºC na escala das médias diárias; 2,0ºC, na escala mensal; 1,0ºC na escala anual; e 1,5ºC na escala de normal climatológica (30 anos) de exibição dos valores médios da temperatura do ar. Conclui-se que em escalas reduzidas (horárias e diárias) existem erros de alta magnitude de variação, porém de baixa frequência de ocorrência. Com o aumento da escala...

Interações entre a atmosfera e a superfície terrestre: variações da temperatura e umidade na bacia B do Núcleo Cunha (IF) - SP; Interactions between atmosphere and land surface: temperature and humidity variations in Basin B of Núcleo Cunha (IF) - SP

Armani, Gustavo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 08/10/2004 PT
Relevância na Pesquisa
56.08%
Os objetivos desta pesquisa são: a) compreender como a temperatura do ar e a umidade relativa na bacia B do Núcleo Cunha (IF) estão relacionadas aos controles climáticos (altitude, declividade e orientação das vertentes, vegetação, a configuração do céu, etc); b) entender qual a importância de cada controle climático nas variações de temperatura e umidade relativa sob a ação de diferentes sistemas atmosféricos. Os controles microclimáticos produzem alterações no ritmo da temperatura e da umidade relativa de diferentes formas e graus de importância em função do sistema atmosférico atuante. Entretanto, a combinação de controles climáticos específicos pode criar ambientes que mantém o ritmo da temperatura e umidade mais estável, independente do sistema atmosférico que estiver atuando. A água no solo desempenha um papel fundamental na minimização das variações da temperatura e da umidade em ambientes específicos. A vegetação também desempenha um papel importante no controle dos valores de umidade relativa, sendo mais relevante que a declividade e a orientação da vertente. As unidades climáticas da Bacia B foram delimitadas como síntese de todas as interações entre os atributos e controles climáticos. O conceito de unidade climática como um espaço onde a interação entre os atributos e controles climáticos tem uma certa homogeneidade...

Viscoelastic behavior of persimmons dried at constant air temperature

Nicoleti, J. F.; Silveira, V; Telis-Romero, J.; Telis, VRN
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 143-150
ENG
Relevância na Pesquisa
56.14%
The viscoelastic behavior of dried persimmons at different air-drying temperatures and velocities was evaluated. Air temperatures and velocities were varied according to a second-order central composite design, with temperature ranging from 40degreesC to 70degreesC and air velocity from 0.8 to 2.0 m/s. After drying, persimmons were equilibrated at four different water activities: 0.432, 0.576, 0.625 and 0.751. The rheological behavior of dried and conditioned persimmons was studied under uniaxial compression-relaxation tests. Three different rheological models were fitted to the experimental relaxation curves: Maxwell, Generalized Maxwell and Peleg and Normand. Based on the root mean square of residuals, the Generalized Maxwell model showed the best fit and a regression analysis was applied to obtain response surfaces for the model parameters. The dependence of the rheological properties on water activity was also analysed. Results showed that only the linear effect of air temperature was significant at a 5% level on the equilibrium stress and relaxation times. In a general way, these parameters increased with increasing air temperature and decreasing water activity. (C) 2004 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.

Effects of Irrigation and Tree Spacing on Soil and Air Temperature Profiles of Olive Orchards

Andrade, Josè; Santos, Francisco; Correia, Manuela; Paço, Teresa
Fonte: VIIth International Symposium on Olive Growing Publicador: VIIth International Symposium on Olive Growing
Tipo: Aula
POR
Relevância na Pesquisa
66.18%
Changes on the climate of the boundary layer occur when a vegetation cover above a bare soil is introduced, namely on temperatures and humidity profiles, above and under soil surface. Since air and soil temperatures affect crop growth and development and also soil moisture, they have been used as driving variables in numerous crop growth and development models as well as in those referred to soil mineralization, evaporation, transpiration, etc. The aim of this work was to evaluate (a) the soil thermal behavior in two olive orchards (Olea europaea sp. europaea), both grown on soils with little profile development (Regosol and Cambisol) and subject to drip irrigation but with different spacing between trees, and (b) the air thermal profile over olive rows. Experiments were performed from April to June 2012 in Southern Portugal. Soil and air temperatures were measured by thermocouples. The two orchards changed spatial distribution of soil surface temperature, soil temperature profiles and air temperature within the canopy, either on a daily or hourly basis. Olive tree spacing and irrigation affected both the soil thermal behavior and air thermal profiles. Tree spacing affected the horizontal gradients established along the interrows (intensity and rhythm). Irrigation reduced hourly and daily mean soil surface temperatures and daily thermal amplitudes of both profiles. Differences were also found on damping depths of the thermal wave estimated for the driest and the wettest profiles. Along the row...

A neural network based intelligent predictive sensor for cloudiness, solar radiation and air temperature

Ferreira, P. M.; Gomes, João M.; Martins, I.; Ruano, A. E.
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Artigo de Revista Científica
Publicado em //2012 ENG
Relevância na Pesquisa
55.95%
Accurate measurements of global solar radiation and atmospheric temperature, as well as the availability of the predictions of their evolution over time, are important for different areas of applications, such as agriculture, renewable energy and energy management, or thermal comfort in buildings. For this reason, an intelligent, light-weight and portable sensor was developed, using artificial neural network models as the time-series predictor mechanisms. These have been identified with the aid of a procedure based on the multi-objective genetic algorithm. As cloudiness is the most significant factor affecting the solar radiation reaching a particular location on the Earth surface, it has great impact on the performance of predictive solar radiation models for that location. This work also represents one step towards the improvement of such models by using ground-to-sky hemispherical colour digital images as a means to estimate cloudiness by the fraction of visible sky corresponding to clouds and to clear sky. The implementation of predictive models in the prototype has been validated and the system is able to function reliably, providing measurements and four-hour forecasts of cloudiness, solar radiation and air temperature.

A neural network based intelligent predictive sensor for cloudiness, solar radiation and air temperature. Sensors: Correction. 2012, 12, 15750–15777

Ferreira, P. M.; Gomes, João M.; Martins, I.; Ruano, A. E.
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
Relevância na Pesquisa
55.95%
Accurate measurements of global solar radiation and atmospheric temperature, as well as the availability of the predictions of their evolution over time, are important for different areas of applications, such as agriculture, renewable energy and energy management, or thermal comfort in buildings. For this reason, an intelligent, light-weight and portable sensor was developed, using artificial neural network models as the time-series predictor mechanisms. These have been identified with the aid of a procedure based on the multi-objective genetic algorithm. As cloudiness is the most significant factor affecting the solar radiation reaching a particular location on the Earth surface, it has great impact on the performance of predictive solar radiation models for that location. This work also represents one step towards the improvement of such models by using ground-to-sky hemispherical colour digital images as a means to estimate cloudiness by the fraction of visible sky corresponding to clouds and to clear sky. The implementation of predictive models in the prototype has been validated and the system is able to function reliably, providing measurements and four-hour forecasts of cloudiness, solar radiation and air temperature.

Relationships of photosynthetic photon flux density, air temperature and humidity with tomato leaf diffusive conductance and temperature

Righi,Evandro Zanini; Buriol,Galileo Adeli; Angelocci,Luiz Roberto; Heldwein,Arno Bernardo; Tazzo,Ivonete Fátima
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2012 EN
Relevância na Pesquisa
56.15%
The objective was to study the leaf temperature (LT) and leaf diffusive vapor conductance (gs) responses to temperature, humidity and incident flux density of photosynthetically active photons (PPFD) of tomato plants grown without water restriction in a plastic greenhouse in Santa Maria, RS, Brazil. The plants were grown in substrate and irrigated daily. The gs was measured using a steady-state null-balance porometer on the abaxial face of the leaves during the daytime. Both leaf surfaces were measured in one day. The PPFD and LT were measured using the porometer. Leaf temperature was determined using an infrared thermometer, and air temperature and humidity were measured using a thermohygrograph. The leaves on the upper layer of the plants had higher gs than the lower layer. The relationship between the gs and PPFD was different for the two layers in the plants. A consistent relationship between the gs and atmospheric water demand was observed only in the lower layer. The LT tended to be lower than the air temperature. The mean value for the gs was 2.88 times higher on the abaxial than adaxial leaf surface.

Espacialização da temperatura mensal e anual do ar no estado de Alagoas baseado em modelo determinístico global; Monthly and annual air temperature spatialization in Alagoas based on a deterministic models

Santos, Paulo José dos
Fonte: Universidade Federal de Alagoas; BR; Processos de superfície terrestre; Programa de Pós-Graduação em Meteorologia; UFAL Publicador: Universidade Federal de Alagoas; BR; Processos de superfície terrestre; Programa de Pós-Graduação em Meteorologia; UFAL
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
66.21%
The space-temporal estimative of air temperature provide information on several key areas, such as weather element influences in several metabolic and physiological processes in living organisms. This also includes their direct effects on the climate, that for her time, it intervenes in the agriculture as for the agroclimatic zoning, definition of sowing times, projects and handling of the irrigation, determination of potential productivity, zoning of climatic risk, credit and safe agricultural. Because of the small number of meteorological stations and of the scarce readiness of data, the need of the application appears every time larger of Geoestatistic in mathematical models and regression equations that allow to esteem the temperature. Therefore, this work interferes in this context, approaching the estimate of the air temperature as for his space and temporary distribution, where important sazonality patterns are revealed. The averages of the air temperature were calculated for the series in every month and station, in order to expose the distinction among the monthly and annual sazonalities. This itinerary is in agreement with the climatology of NEB and of the Alagoas State. The series were obtained in the database of the National Institute of Meteorology (INMET)...

Rela????o entre seq????ncias de temperaturas m??nimas e riscos de geadas no Estado Rio Grande do Sul.; Relation between sequence of occurrence of the minimum air temperature and frost risk in the State of Rio Grande do Sul.

BONINI, Antonio S??rgio dos Santos
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Agronomia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
66.18%
The minimum air temperature is one of the meteorological variables which exercises relevant influence over environmental conditions, being one of the determining factors to the growth and development of the plants. The evaluation of the minimum air temperature, in the Southern Region of Brasil, is directly related to the identification of the more adequate periods for the sowing or planting of the various cultivation, for it permits the establishment of the critical plant phase to coincide with the period of a minor probability of harmful temperature occurrence to the cultivation. Through the thirty years of daily data study of the minimum air temperature, in twelve surface meteorological stations, in the State of Rio Grande do Sul, during the months of the year, the characterization period was done with a minimum temperature within the following interval t < 3??C. The probability of minimum temperature to be found in the referred interval was obtained through the calculation of the conditional probability and the probability of occurrence of days with the minimum temperature within an interval of seven days, using the first-order Markov Chain Model. The results obtained showed that the probability of a determined day to be found at a minimum particular temperature depends on the precedent state...

Building a model to investigate the effect of varying ambient air temperature on air-cooled organic Rankine cycle plant performance

Varney, J.; Bean, N.
Fonte: Geoscience Australia; Australia Publicador: Geoscience Australia; Australia
Tipo: Conference paper
Publicado em //2012 EN
Relevância na Pesquisa
56.27%
Air-cooling is necessary for geothermal plays in dry areas and ambient air temperature significantly affects the power output of air-cooled thermal power plants. Hence, a method for determining the effect of ambient air temperature on subcritical and supercritical, air-cooled binary Rankine cycles using moderate temperature geothermal fluid and various working fluids is presented. Part of this method, includes a method for maximizing working fluid flow from a supercritical heat exchanger. In the example presented isobutane is used as the working fluid, while the geothermal fluid temperature and flowrate are set at 150°C and 126kg/s. Results of this analysis show that for every 14°C increase in ambient air temperature, above the ambient temperature used for design purposes, there is ~20% loss in brine efficiency; while conversely, there is no gain in brine efficiency for any drop in ambient air temperature below the ambient air temperature used for design purposes. Using the ambient air temperature distribution from Leigh Creek, Australia, this analysis shows that an optimally designed plant produces 6% more energy annually than a plant designed using the mean ambient temperature.; J.J. Varney and N. Bean; GeoCat; 74874

Étude de l’impact de la température et de l’humidité sur la survie et la dynamique de la ponte de la mouche du chou (Delia radicum L.)

Lepage, Marie-Pier
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
Relevância na Pesquisa
56.04%
On dénombre divers modèles de simulation de la mouche du chou (Delia radicum L.), mais plusieurs comportent d’importantes lacunes au niveau des différences génotypiques de l’insecte et des paramètres utilisés. L’objectif principal de ce projet est de rassembler les informations manquantes afin de créer dans le futur un modèle bioclimatique permettant de simuler efficacement la dynamique des populations de ce ravageur. L’effet de la température et de l’humidité du sol a été mesuré sur les œufs et les larves de la mouche du chou. L’humidité n’influence la survie des œufs qu’en dessous de 25% [m/m]. L’exposition graduelle des œufs à des températures élevées au dessus de 33°C affecte également la survie. La survie des larves augmente avec la hausse des températures et de l’humidité. Nous croyons que la mouche du chou est bien adaptée aux conditions des sols organiques au Québec, et nous recommandons l’intégration de la température du sol pour les stades au sol plutôt que de l’air dans l’élaboration d’un nouveau modèle. La ponte a également été étudiée à partir de différents critères préétablis pour chacun des génotypes hâtifs et tardifs, à différentes températures. Excepté pour la pré-oviposition qui est plus longue chez les hâtifs...

Modeling air temperature through a combination of remote sensing and GIS data

Cristóbal Rosselló, Jordi; Ninyerola i Casals, Miquel; Pons, Xavier
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2008 ENG
Relevância na Pesquisa
66.22%
Air temperature is involved in many environmental processes such as actual and potential evapotranspiration, net radiation and species distribution. Ground meteorological stations provide important local data of air temperature, but a continuous surface for large and heterogeneous areas is also needed. In this paper we present a hybrid methodology between Remote Sensing and Geographical Information Systems to retrieve daily instantaneous, mean, maximum and minimum air temperatures (2002–2004) as well as monthly and annual mean, maximum and minimum air temperatures (2000-2005) on a regional scale (Catalonia, northeast of the Iberian Peninsula) by means of multiple regression analysis and spatial interpolation techniques. To perform multiple regression analysis we have used geographical and multiresolution remotely sensed variables as predictors. The geographical variables we have included are altitude, latitude, continentality and solar radiation. As remote sensing predictors, we have selected those variables that are most closely related with air temperature such as albedo, land surface temperature (LST) and NDVI obtained from Landsat-5 (TM), Landsat-7 (ETM+), NOAA (AVHRR) and TERRA (MODIS) satellites. The best air temperature models are obtained when remote sensing variables are combined with geographical variables: averaged R2 = 0.60 and averaged root mean square error (RMSE) = 1.75C for daily temperatures...

Projected Average Summer Air Temperature Increases and the Implications for Philadelphia's Surface Drinking Water Supply

Rockwell, Julia
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 05/12/2014 EN_US
Relevância na Pesquisa
56.23%
Water managers are faced with numerous uncertainties that need to be addressed in the development of long-term planning initiatives and large-scale investment decisions. One of the primary and perhaps most far-reaching of these uncertainties is climate change. The objective of this project is to utilize one aspect of projected climate change impacts, increasing average summer air temperature, to understand potential impacts to surface drinking water supply temperatures in the Schuylkill River at Philadelphia, PA. The project consists of three major components. As an initial step, climate model output from the Coupled Model Intercomparison Project Phase 5 (CMIP5) was evaluated for the Northeast US and Philadelphia by mapping and analyzing Network Common Data Form (NetCDF) files for near-surface air temperatures in Matlab. The evaluation of climate model output included model validation for six selected CMIP5 Global Climate Models (GCMs), as well as future projections using the Representative Concentration Pathway 8.5 (RCP8.5) climate scenario. Secondly, this project aimed to develop a statistical relationship between air and surface water temperatures in Philadelphia using publicly available data from the United States Geological Survey (USGS) and Daymet. Following the aforementioned empirical analyses...

Increased air temperature during simulated autumn conditions impairs photosynthetic electron transport between photosystem II and photosystem

Busch, Florian; Huner, Norman P A; Ensminger, Ingo
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
55.95%
Changes in temperature and daylength trigger physiological and seasonal developmental processes that enable evergreen trees of the boreal forest to withstand severe winter conditions. Climate change is expected to increase the autumn air temperature in th

ESTIMATIVA DA TEMPERATURA MÉDIA DIÁRIA DO AR EM DISTINTAS REGIÕES BRASILEIRAS EMPREGANDO MÉTODOS ALTERNATIVOS; ESTIMATION OF DAILY MEAN AIR TEMPERATURE IN DISTINCT REGIONS OF BRAZIL USING ALTERNATIVE METHODS

JERSZURKI, Daniela; Universidade Federal do Paraná; SOUZA, Jorge Luiz Moretti de; Universidade Federal do Paraná
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf; application/pdf
Publicado em 16/12/2010 POR; ENG
Relevância na Pesquisa
66.19%
This study aimed to determine the reliability of two alternative methods (IAC and Max/Min) commonly used to estimate daily mean air temperature in relation to the standard method recommended by the National Institute of Meteorology (INMET). The air temperature data were obtained by the National Institute for Space Research (INPE), between the period 2005 to 2008 for twelve locations, in ten Brazilian States. Statistical analysis of data were made using linear regression and their correlation coefficients (R), precision index ("d") and performance index ("c"), considering INMET method as standard. The IAC method showed better results to estimate daily mean air temperature than Max/Min method for annual and seasonal period. The Max/Min method showed serious constraints to estimate the daily mean air temperature, especially in the spring and summer seasons. There was no influence of latitude and altitude on the performance of estimates daily mean air temperature with the IAC and Extremes methods for the localities studied.; O presente trabalho teve por objetivo determinar a confiabilidade de dois métodos alternativos (IAC e Extremos) comumente utilizadas para estimar a temperatura média diária do ar, em relação ao método padrão recomendada pelo Instituto Nacional de Meteorologia (INMET). Os dados de temperatura do ar foram cedidos pelo Instituto Nacional de Pesquisas Espaciais (INPE)...

Urbanization effects upon the air temperature in Mexicali, B. C., México

GARCÍA CUETO,O. R.; TEJEDA MARTÍNEZ,A.; BOJÓRQUEZ MORALES,G.
Fonte: Centro de Ciencias de la Atmósfera, UNAM Publicador: Centro de Ciencias de la Atmósfera, UNAM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2009 EN
Relevância na Pesquisa
66.11%
A spatial and temporal analysis of the air temperature in the boundary layer of Mexicali City, B.C. and rural surroundings was carried out. Several statistical tests were applied to a long-term database (1950-2000) to identify the temporal variability of the temperature; positive and statistically significant trends of the minimum temperature were observed, with a value of 0.66 °C/decade in the urban area, while in rural stations, smaller values were observed. Statistically significant results, but with a negative trend, were also observed with respect to the maximum temperature. When the spatial analysis was carried out, with a data base from a recent period (2000-2005), a nocturnal warm air mass in the urban atmosphere was present, and it was found that the maximum difference between the city and its surroundings occurs in winter with a value of 5.7 °C. These results suggest that urbanization, as well as in many other cities around the world, importantly affect the local climate and corroborate that in this city, an urban heat island has developed.