Hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil

Rodrigues, Thiago Rangel; Curado, Leone Francisco Amorim; Pereira, Vinícius Marcio Rodrigues; Sanches, Luciana; Nogueira, José S.

doi:10.1590/0001-3765201620150130

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…The climate in the study area showed a distinct seasonal variation (Figure 2). The dry season, which was defined as the period with a rainfall depth lower than 100 mm/month [4,54,55], occurred from April to October, and approximately 25% of the rainfall was recorded during this period (Figure 2F). Mean yearly accumulated rainfall (±sd) was 941 ± 297 mm during the study period, which is 34% lower than the expected rainfall for this region.…”

Section: Seasonal Variation In Micrometeorological Conditionmentioning

confidence: 99%

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Júnior

Vourlitis

Curado

et al. 2021

Water

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The Brazilian savanna (Cerrado) has been heavily impacted by agricultural activities over the last four to five decades, and reliable estimates of reference evapotranspiration (ETo) are needed for water resource management and irrigation agriculture. The Penman–Monteith (PM) is one of the most accepted models for ETo estimation, but it requires many inputs that are not commonly available. Therefore, assessing the FAO guidelines to compute ETo when meteorological data are missing could lead to a better understanding of which variables are critically important for reliable estimates of ETo and how climatic variables are related to water requirements and atmospheric demands. In this study, ETo was computed for a grass-dominated part of the Cerrado from April 2010 to August 2019. We tested 12 different scenarios considering radiation, relative humidity, and/or wind speed as missing climatic data using guidelines given by the FAO. Our results presented that wind speed and actual vapor pressure do not affect ETo estimates as much as the other climatic variables; therefore, in the Cerrado’s conditions, wind speed and relative humidity measurements are less required than temperature and radiation data. When radiation data were missing, the computed ETo was overestimated compared to the benchmark. FAO procedures to estimate the net radiation presented good results during the wet season; however, during the dry season, their results were overestimated because the method could not estimate negative Rn. Our results indicate that radiation data have the highest impact on ETo for our study area and presumably for regions with similar climatic conditions. In addition, those FAO procedures for estimating radiation are not suitable when radiation data are missing.

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Section: Seasonal Variation In Micrometeorological Conditionmentioning

confidence: 99%

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Júnior

Vourlitis

Curado

et al. 2021

Water

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“…However, the spatial distribution and temporal variation of rainfall (Curado et al, 2016), as well as duration of droughts (Rodrigues et al, 2016a), can have a profound impact on the dynamics of energy exchange by affecting the partitioning of energy between sensible and latent heat fluxes (Vourlitis et al, 2008;Rocha et al, 2009;Rodrigues et al, 2013;. Because our current knowledge of the climate system is still insufficient to solve some of the divergent predictions about this topic, it is important to improve the understanding of mechanisms of vegetation-climate interaction in forested regions such as the Amazon (Gonçalves et al, 2013), whose seasonal patterns of certain biophysical and climatic parameters show complex interactions Rodrigues et al, 2016b).…”

Section: Introductionmentioning

confidence: 99%

Surface albedo in different land-use and cover types in Amazon forest region

Faria¹,

Rodrigues²,

Curado³

et al. 2018

Rev. ambiente água

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Albedo is the portion of energy from the Sun that is reflected by the earth's surface, thus being an important variable that controls climate and energy processes on Earth. Surface albedo is directly related to the characteristics of the Earth's surface materials, making it a useful parameter to evaluate the effects of original soil cover replacement due to human occupation. This study evaluated the changes in the surface albedo values due to the conversion of vegetation to other land uses and to analyze the applicability of the use of albedo in the spatial delimitation of land-use classes in the transitional region between the Cerrado and Amazon biomes. Surface albedo measurements were obtained from processing of Landsat Thematic Mapper data in the Geographic Information System (GIS), and land-use information were collected using Google Earth high-resolution images. The results show that human activities such as the cultivation of crops and burning have contributed substantially to variations in the surface albedo, and that albedo estimates from Landsat imagery have the potential to help in the recognition and delimitation of features of land use and cover.Keywords: Landsat 5, reflectance, remote sensing.Albedo de superfície em diferentes classes de uso e cobertura do solo em região de floresta amazônica RESUMO Albedo é a porção de energia solar refletida pela superfície terrestre, sendo assim, uma importante variável que controla os processos climáticos e energéticos sobre a Terra. Albedo da superfície está diretamente relacionado com as características dos materiais da superfície da Terra, tornando-se um parâmetro útil para avaliar os efeitos da substituição de cobertura do solo original devido à ocupação humana. Este estudo objetivou avaliar as alterações nos valores de albedo da superfície em função da conversão da vegetação em outras formas de uso do solo, e analisar a aplicabilidade do uso do albedo na delimitação espacial de classes de uso do solo em região de transição entre os biomas Cerrado e Amazônia. As medidas de albedo da superfície foram obtidas a partir de processamento de dados Landsat Thematic Mapper em sistema SIG e as informações de uso do solo foram obtidas usando imagem de alta resolução do Google Earth.Rev. Ambient. Água vol. 13 n. 2, e2120 -Taubaté 2018 2 Thiago de Oliveira Faria et al.Os resultados demonstram que ações antrópicas sobre a superfície, como desenvolvimento de lavouras e queimadas contribuem substancialmente para as mudanças no albedo de superfície, e que as estimativas de albedo a partir de imagens Landsat apresentam potencial para auxiliar na identificação e delimitação de feições de uso e cobertura do solo.Palavras-chave: Landsat 5, reflectância, sensoriamento remoto.

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“…2). We considered the dry season as the period with a rainfall depth lower than 100 mm/month (Hutyra et al 2005;Rodrigues et al 2014Rodrigues et al , 2016a. The dry season was defined from April to October, with approximately 25% of the recorded rainfall during the study period (Fig.…”

Section: Seasonal Variation In Micrometeorological Conditionmentioning

confidence: 99%

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Júnior

Vourlitis

Curado

et al. 2021

Preprint

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Since the Brazilian Cerrado has been heavily impacted by agricultural activities over the last four to five decades, reference evapotranspiration (ETo) plays a big role in water resources management for irrigation agriculture. The Penman-Monteith (PM) is one of the most accepted models for ETo estimation, but it requires many inputs that are not commonly available. Therefore, assessing the FAO guidelines to compute ETo when meteorological data are missing could lead to a better understanding of how climatic variables are related to water requirements and atmospheric demands for a grass-mixed savanna region and which variable impacts the estimates the most. ETo was computed from April 2010 to August 2019. We tested twelve different scenarios considering radiation, relative humidity, and/or wind speed as missing climatic data using guidelines given by FAO. When wind speed and/or relative humidity data were the only missing data, the PM method showed the lowest errors in the ETo estimates and correlation coefficient (r) and Willmott’s index of agreement (d) values close to 1.0. When radiation data were missing, computed ETo was overestimated compared to the benchmark. FAO procedures to estimate net radiation presented good results during the wet season; however, during the dry season, their results were overestimated, especially because the method could not estimate negative Rn. Therefore, we can infer that radiation data have the largest impact on ETo for our study area and regions with similar conditions and FAO guidelines are not suitable when radiation data are missing.

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Hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil

Cited by 9 publications

References 32 publications

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Surface albedo in different land-use and cover types in Amazon forest region

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

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