Search

Your search keyword '"Costa, Marcos Heil"' showing total 173 results
Start Over Author "Costa, Marcos Heil" Search Limiters Available in Library Collection
173 results on '"Costa, Marcos Heil"'

1. Local Evapotranspiration Is the Only Relevant Source of Moisture at the Onset of the Rainy Season in South America.

Author

Versieux, Verônica and Costa, Marcos Heil

Subjects
*HUMIDITY, *SUMMER, *REMOTE sensing, *EVAPOTRANSPIRATION, *MONSOONS
Abstract

The South American Monsoon System, which transports moisture from Amazonia to Central-West Brazil, is an important moisture source for the summer rainy season in this region. While local evapotranspiration also contributes to the atmospheric moisture supply, the balance between local and remote sources during the onset of the rainy season remains uncertain. Our research aimed to quantify the role of local evapotranspiration in initiating the rainy season in Central-West Brazil. By utilizing data from various sources, such as remote sensing (MODIS), modern reanalysis (ECMWF's ERA5), and composite products of rainfall (CHIRPS), and analyzing them in a comparative way, we conclusively found that local evapotranspiration is the only relevant source of moisture to the atmosphere during the dry-to-wet season transition, preceding the establishment of the monsoon system. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

3. Sentinel-1 Imagery Used for Estimation of Soil Organic Carbon by Dual-Polarization SAR Vegetation Indices

Author

Santos, Erli Pinto dos, primary, Moreira, Michel Castro, additional, Fernandes-Filho, Elpídio Inácio, additional, Demattê, José Alexandre M., additional, Dionizio, Emily Ane, additional, Silva, Demetrius David da, additional, Cruz, Renata Ranielly Pedroza, additional, Moura-Bueno, Jean Michel, additional, Santos, Uemeson José dos, additional, and Costa, Marcos Heil, additional

Published
2023
Full Text
View/download PDF

30. Influence of climate variability, fire and phosphorus limitation on the vegetation structure and dynamics in the Amazon-Cerrado border.

Author

Dionizio da Silva, Emily Ane, Costa, Marcos Heil, Castanho, Andrea Almeida, Pires, Gabrielle Ferreira, Marimon, Beatriz Schwantes, Marimon-Junior, Ben Hur, Lenza, Eddie, and Pimenta, Fernando Martins

Subjects
CLIMATE change, VEGETATION dynamics, PHOSPHORUS, LEAF area index, PLANT biomass
Abstract

Climate, fire and soil nutritional limitation are important elements that affect the vegetation dynamics in areas of forest-savanna transition. In this paper, we use the dynamic vegetation model INLAND to evaluate the influence of climate variability, fire and phosphorus limitation on the Amazon-Cerrado transitional vegetation structure and dynamics. We assess how each element affects the net primary production, leaf area index and biomass and compare the simulations of aboveground biomass to observed biomass map. We used two climate datasets - the 1960-1990 average seasonal climate and the 1948 to 2008 interannual climate variability, two regional datasets of total soil P content in soil, based on regional (field measurements) and global data and the INLAND fire module. Our results show that climate interannual variability, phosphorus limitation and fire occurrence gradually improve simulated vegetation types and these effects are not homogeneous along the latitudinal/longitudinal gradient showing a synergistic effect among them. In terms of magnitude, the effect of fire is stronger, and is the main driver of vegetation changes along the transition. The nutritional limitation, in turn, is stronger than the effect of climate variability acting on the transitional ecosystems dynamics. Overall, INLAND typically simulates more than 80 % of the biomass variability in the transition zone. However, in many places, the biomass is clearly not well simulated indicating that important soil and physiological factors in the Amazon-Cerrado border, such as lithology and water table depth, carbon allocation strategies and mortality rates, still need to be included in the model. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

32. Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental drought

Author

Powell, Thomas L., primary, Galbraith, David R., additional, Christoffersen, Bradley O., additional, Harper, Anna, additional, Imbuzeiro, Hewlley M. A., additional, Rowland, Lucy, additional, Almeida, Samuel, additional, Brando, Paulo M., additional, da Costa, Antonio Carlos Lola, additional, Costa, Marcos Heil, additional, Levine, Naomi M., additional, Malhi, Yadvinder, additional, Saleska, Scott R., additional, Sotta, Eleneide, additional, Williams, Mathew, additional, Meir, Patrick, additional, and Moorcroft, Paul R., additional

Published
2013
Full Text
View/download PDF

37. Relações entre a data de início das chuvas e a duração da estação de crescimento das culturas na região de Viçosa, Minas Gerais

Author

Machado, Marco Aurélio de Mello, Sediyama, Gilberto Chohaku, Costa, Marcos Heil, and Costa, José Maria Nogueira da

Subjects
Duração da estação de crescimento das culturas, Início das chuvas em Viçosa, Viçosa, Minas Gerais
Abstract

O presente trabalho procurou investigar a série histórica de precipitação pluvial de Viçosa, no Estado de Minas Gerais, com o objetivo de estabelecer as virtuais datas mais adequadas de plantios de culturas agrícolas, bem como definir a duração da estação de crescimento em função da quantidade e distribuição temporal das chuvas. Conhecendo-se o regime de distribuição de chuvas, foi possível avaliar os parâmetros balizadores e as estratégias para manejo das atividades agrícolas, o que permitiu concluir que a) A análise das probabilidades teóricas das durações das estações de crescimento sugere que os plantios de sequeiro podem ser mais seguramente efetuados entre os dias 17.09 a 27.10, o que possibilitaria maximização do período das chuvas por culturas de ciclo médio; b) Para plantios efetuados após o início do mês de novembro seria recomendável a utilização de cultivares precoces, uma vez que a expectativa teórica pela estação de crescimento das culturas seria de somente 160 dias aproximadamente; e c) Ao fazer escolha de datas propícias ao plantio, em função da data de início das chuvas, o agricultor poderá também tomar decisões sobre períodos de aração e gradagem do solo, tipo e níveis de calagem e adubação, épocas de colheita, pulverizações etc. This paper deals with an investigation of histOrical series of rainfall data for Viçosa, in the State of Minas Gerais, with the aim of determining the best agricultural planting dates and defining the length of the growing season in relation to the amount and distribution of rainfall. Analysis of the theoretical probabilities of the duration of thefl growing season suggested that rainfed agriculture can be carried out more safely from September; 17 through October 27 so as to assure a better chance for a medium cycle crop during the rainy period. For planting carried out in the mid-November or after, early cycle cropping is recommended since the theoretical expectation for growing season duration is only 160 days approximately. The importante of awareness of the beginning date of the rainy season with regard to the planting season also holds true when determining other agricultural pratices such as tillage, and harvesting dates.

Published
1995

44. Modelo de otimização dos recursos hídricos para irrigação, conforme a época de plantio

Author

Costa, Marcos Heil, Alves, Adil Rainier, Queiroz, Daniel Marçal de, and Sediyama, Gilberto Chohaku

Subjects
Risco climático, Recursos hídricos, Ciências Agrárias
Abstract

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Propôs-se desenvolver, neste trabalho, um modelo para o consumo de água para fins de irrigação com o objetivo de prever, por meio de simulação, o impacto que teriam diferentes épocas de plantio adotadas pelos irrigantes de toda uma bacia hidrográfica na vazão dos cursos d'água dessa bacia, na época mais seca do ano. O modelo desenvolvido resultados obtidos em função da capacidade do computador disponível e do tempo de processamento do modelo. O modelo mostrou-se sensível aos parâmetros de entrada testados, porém sua validação não pôde ser feita nesta parte do trabalho, em razão da complexidade da bacia hidrográfica simulada.

Published
1991

50. Influence of Land Use and Land Cover on Hydraulic and Physical Soil Properties at the Cerrado Agricultural Frontier.

Author

Dionizio, Emily Ane and Costa, Marcos Heil

Subjects
CONSERVATION of natural resources, WATER supply, SOIL quality, WATER conservation, SOIL conservation
Abstract

Western Bahia is one of the most active agricultural frontiers in the world, which raises concern about its natural resources conservation, especially regarding water availability. This study evaluated the influence of five different land uses and land covers on physical and hydraulic soil properties, and developed pedotransfer functions to derive regional hydraulic properties. Significant changes between physical and hydraulic soil properties under agricultural areas and under natural vegetation cover were found, reinforcing that agricultural activity may influence the soil water balance. Cerrado and Forest formation areas have higher infiltration rates ( K s a t ) compared to managed areas, with average values of 16.29 cm h−1, and 14.47 cm h−1, while irrigated croplands, rainfed croplands and pasture areas have much smaller infiltration rates, with K s a t equal to 3.01 cm h−1, 6.22 cm h−1 and 5.01 cm h−1, respectively. Our results suggest that the agriculture practices do not directly affect the vertical nature of hydrological flowpath, except in the case of intensive irrigated agriculture areas, where K s a t reduction can lead to erosive processes favoring organic matter losses, and decreases in productivity and soil quality. Impacts of land use change on hydraulic and physical soil properties are a reality in the Cerrado agriculture frontier and there is an urgent need to monitor how these changes occur over time to develop effective mitigation strategies of soil and water conservation. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results