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| Registros recuperados: 10 | |
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| MAIA, A. de H. N.; GONDIM, R. S.; CASTRO, M. A. H. de. |
| Resumo: O objetivo deste trabalho foi avaliar a sensibilidade da demanda de água para irrigação numa sub-região da bacia do Rio Jaguaribe, no Estado do Ceará, a variáveis climáticas e fatores operacionais dos sistemas de cultivo. A necessidade hídrica bruta de culturas (NHB) é estimada usando um modelo simplificado baseado num balanço hídrico, a partir de dados de evapotranspiração mensal das culturas (ETP), que depende da temperatura e da composição de culturas, total mensal de chuva (PPT) e eficiência de aplicação de água dos sistemas de irrigação (EA). Foi realizada uma análise de sensibilidade algébrica, para quantificar o efeito de alterações relativas nas seguintes variáveis de entrada do modelo sobre a NHB: temperatura média mensal (T), usada para... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Demanda hídrica; Semiárido.; Irrigação; Agricultura; Modelo matemático; Mudança Climática.; Agriculture; Irrigation requirement; Climate models; Mathematical models. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1067318 |
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| JUSTINO, L. F.; ALVES JÚNIOR, J.; BATTISTI, R.; STONE, L. F.; HEINEMANN, A. B.. |
| O estudo visou quantificar o retorno econômico proporcionado pela irrigação suplementar do feijoeiro na época das águas. A produtividade do feijoeiro foi simulada para 30 anos no modelo de cultura Cropgro-Dry Bean para a cultivar Pérola, considerando as datas de semeadura de 1º de novembro a 1º de janeiro e quatro manejos hídricos: sem irrigação; irrigação com 70%, 50% e 30% do total de água disponível no solo (TAD). As irrigações a 70%, 50% e 30% do TAD aumentaram a produtividade em 26,7% a 41,4%; 5,5% a 14,5%; e 0,4% a 2,4% , respectivamente . A demanda média foi de 53 mm ciclo-1 no manejo de 70% do TAD e de 19 mm ciclo-1 no de 50% e de 30%, sem necessidade de irrigação na maioria das estações de cultivo. O atraso na semeadura em relação a 1º de novembro... |
| Tipo: Folhetos |
Palavras-chave: Feijão; Phaseolus Vulgaris; Risco Climático; Modelo de Simulação; Análise Econômica; Manejo; Irrigação; Método de Irrigação; Rendimento; Irrigation management; Climate models; Economic analysis; Crop models; Yields; Beans. |
| Ano: 2022 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1140955 |
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| Thomas, Yoann; Cassou, Christophe; Gernez, Pierre; Pouvreau, Stephane. |
| Beyond key ecological services, marine resources are crucial for human food security and socio-economical sustainability. Among them, shellfish aquaculture and fishing are of primary importance but become more vulnerable under anthropogenic pressure, as evidenced by reported mass mortality events linked to global changes such as ocean warming and acidification, chemical contamination, and diseases. Understanding climate-related risks is a vital objective for conservation strategies, ecosystems management and human health. We provide here a comprehensive study of the historical mortality of adult oysters related to observed climate variability along the French Atlantic coast from 1986 to 2015, and we built on this knowledge to develop hindcast and forecast... |
| Tipo: Text |
Palavras-chave: North Atlantic; Weather regime; Oyster; Monitoring network; Mortality risk assessment; Climate models; RCP scenarios. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00461/57255/59281.pdf |
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| Liu, Wei; Fedorov, Alexey; Sevellec, Florian. |
| We explore the mechanisms by which Arctic sea ice decline affects the Atlantic meridional overturning circulation (AMOC) in a suite of numerical experiments perturbing the Arctic sea ice radiative budget within a fully coupled climate model. The imposed perturbations act to increase the amount of heat available to melt ice, leading to a rapid Arctic sea ice retreat within 5 years after the perturbations are activated. In response, the AMOC gradually weakens over the next similar to 100 years. The AMOC changes can be explained by the accumulation in the Arctic and subsequent downstream propagation to the North Atlantic of buoyancy anomalies controlled by temperature and salinity. Initially, during the first decade or so, the Arctic sea ice loss results in... |
| Tipo: Text |
Palavras-chave: Arctic; Meridional overturning circulation; Climate models. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00599/71107/69388.pdf |
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| Souza,Paulo Jorge de Oliveira Ponte de; Farias,José Renato Bouças; Abreu,José Paulo Mourão de Melo e; Ribeiro,Aristides; Rocha,Edson José Paulino da; Botelho,Marcel do Nascimento; Sousa,Adriano Marlisom Leão de. |
| The objective of this work was to parameterize, calibrate, and validate a new version of the soybean growth and yield model developed by Sinclair, under natural field conditions in northeastern Amazon. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, PA, Brazil, from 2006 to 2009. The climatic conditions during the experiment were very distinct, with a slight reduction in rainfall in 2007, due to the El Niño phenomenon. There was a reduction in the leaf area index (LAI) and in biomass production during this year, which was reproduced by the model. The simulation of the LAI had root mean square error (RMSE) of 0.55 to 0.82 m² m-2, from 2006 to 2009. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Amazon region; Climate models; Leaf area index; Soybean crop expansion; Yield simulation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000600001 |
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| Fischer, Carolyn; Morgenstern, Richard D.. |
| Estimates of marginal abatement costs for reducing carbon emissions in the United States by the major economic-energy models vary by a factor of five, undermining support for mandatory policies to reduce greenhouse gas emissions. We use meta analysis to explain these cost differences, holding policy regimes constant and focusing on the role of baseline emissions projections and structural characteristics of the models. The results indicate that certain assumptions, like freer trade and greater disaggregation of regions and nonenergy goods, lead to lower estimates of marginal abatement costs, while more disaggregated energy goods raise them. Other choices, like myopic optimization by households or the inclusion of an international finance sector, seem less... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Climate models; Carbon tax; Environmental Economics and Policy; Q4; Q25; D58. |
| Ano: 2003 |
URL: http://purl.umn.edu/10537 |
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| Registros recuperados: 10 | |
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