Moisture source for the Amazon Basin: A study of contrasting years
The regions where the divergence of vertically integrated water vapor flux, averaged over a season or a year, is positive (negative) are sources (sinks) of moisture for the atmosphere. An aerial river is defined as a stream of strong water vapor flux connecting a source and a sink. Moisture flux, it...
| Autor principal: | Satyamurty, Prakki |
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| Outros Autores: | Costa, Cláudia Priscila Wanzeler da, Manzi, Antônio Ocimar |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Theoretical and Applied Climatology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/17931 |
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oai:repositorio:1-17931 |
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oai:repositorio:1-17931 Moisture source for the Amazon Basin: A study of contrasting years Satyamurty, Prakki Costa, Cláudia Priscila Wanzeler da Manzi, Antônio Ocimar High Pressure Intertropical Convergence Zone Moisture Numerical Model Precipitation (climatology) Sensitivity Analysis Subtropical Region Water Vapor Amazon Basin Atlantic Ocean Atlantic Ocean (north) Atlantic Ocean (south) The regions where the divergence of vertically integrated water vapor flux, averaged over a season or a year, is positive (negative) are sources (sinks) of moisture for the atmosphere. An aerial river is defined as a stream of strong water vapor flux connecting a source and a sink. Moisture flux, its divergence, and sources and sinks over the tropics of South and Central America and the adjoining Atlantic Ocean are obtained for dry years and for wet years in the Amazon Basin. Results show that the Amazon Basin is a sink region for atmospheric moisture in all seasons and that there are two source regions for the moisture in the basin, one situated in the South Atlantic and the other in the North Atlantic, both located equator-ward of the respective subtropical high-pressure centers. The convergence of moisture increases over the Amazon Basin in austral summer, and at the same time it decreases in the Pacific and Atlantic ITCZs. Box model calculations reveal that the wet years, on the average, present about 55 % more moisture convergence than the dry years in the Amazon Basin. A reduction in the moisture inflow across the eastern and northern boundaries of the basin (at 45°W and at the Equator, respectively) and an increase in the outflow across the southern boundary (at 15°S) lead to dry conditions. The annual mean contribution of moisture convergence to the precipitation over the Amazon Basin is estimated to be 70 %. In the dry years, it lowers to around 50 %. The net convergence of water vapor flux over the basin is a good indicator of the wet or dry condition. © 2012 Springer-Verlag. 2020-06-15T21:50:12Z 2020-06-15T21:50:12Z 2013 Artigo https://repositorio.inpa.gov.br/handle/1/17931 10.1007/s00704-012-0637-7 en Volume 111, Número 1-2, Pags. 195-209 Restrito Theoretical and Applied Climatology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
High Pressure Intertropical Convergence Zone Moisture Numerical Model Precipitation (climatology) Sensitivity Analysis Subtropical Region Water Vapor Amazon Basin Atlantic Ocean Atlantic Ocean (north) Atlantic Ocean (south) |
| spellingShingle |
High Pressure Intertropical Convergence Zone Moisture Numerical Model Precipitation (climatology) Sensitivity Analysis Subtropical Region Water Vapor Amazon Basin Atlantic Ocean Atlantic Ocean (north) Atlantic Ocean (south) Satyamurty, Prakki Moisture source for the Amazon Basin: A study of contrasting years |
| topic_facet |
High Pressure Intertropical Convergence Zone Moisture Numerical Model Precipitation (climatology) Sensitivity Analysis Subtropical Region Water Vapor Amazon Basin Atlantic Ocean Atlantic Ocean (north) Atlantic Ocean (south) |
| description |
The regions where the divergence of vertically integrated water vapor flux, averaged over a season or a year, is positive (negative) are sources (sinks) of moisture for the atmosphere. An aerial river is defined as a stream of strong water vapor flux connecting a source and a sink. Moisture flux, its divergence, and sources and sinks over the tropics of South and Central America and the adjoining Atlantic Ocean are obtained for dry years and for wet years in the Amazon Basin. Results show that the Amazon Basin is a sink region for atmospheric moisture in all seasons and that there are two source regions for the moisture in the basin, one situated in the South Atlantic and the other in the North Atlantic, both located equator-ward of the respective subtropical high-pressure centers. The convergence of moisture increases over the Amazon Basin in austral summer, and at the same time it decreases in the Pacific and Atlantic ITCZs. Box model calculations reveal that the wet years, on the average, present about 55 % more moisture convergence than the dry years in the Amazon Basin. A reduction in the moisture inflow across the eastern and northern boundaries of the basin (at 45°W and at the Equator, respectively) and an increase in the outflow across the southern boundary (at 15°S) lead to dry conditions. The annual mean contribution of moisture convergence to the precipitation over the Amazon Basin is estimated to be 70 %. In the dry years, it lowers to around 50 %. The net convergence of water vapor flux over the basin is a good indicator of the wet or dry condition. © 2012 Springer-Verlag. |
| format |
Artigo |
| author |
Satyamurty, Prakki |
| author2 |
Costa, Cláudia Priscila Wanzeler da Manzi, Antônio Ocimar |
| author2Str |
Costa, Cláudia Priscila Wanzeler da Manzi, Antônio Ocimar |
| title |
Moisture source for the Amazon Basin: A study of contrasting years |
| title_short |
Moisture source for the Amazon Basin: A study of contrasting years |
| title_full |
Moisture source for the Amazon Basin: A study of contrasting years |
| title_fullStr |
Moisture source for the Amazon Basin: A study of contrasting years |
| title_full_unstemmed |
Moisture source for the Amazon Basin: A study of contrasting years |
| title_sort |
moisture source for the amazon basin: a study of contrasting years |
| publisher |
Theoretical and Applied Climatology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/17931 |
| _version_ |
1787143933022699520 |
| score |
11.675608 |