An observed trend in central South American precipitation
Seasonal linear trends of precipitation from South American station data, which have been averaged onto grids, are examined, with emphasis on the central continent. In the period 1976-99, the largest trend south of 20°S occurs during the January-March season, is positive, and is centered over southe...
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v17_n22_p4357_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v17_n22_p4357_Liebmann |
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paper:paper_08948755_v17_n22_p4357_Liebmann2023-06-08T15:47:51Z An observed trend in central South American precipitation Coastal zones Data reduction Sea level Temperature Coastal upwelling Grids Precipitation (meteorology) air-sea interaction precipitation (climatology) sea surface temperature seasonality trend analysis upwelling Atlantic Ocean Atlantic Ocean (South) oceanic regions South America Western Hemisphere World Seasonal linear trends of precipitation from South American station data, which have been averaged onto grids, are examined, with emphasis on the central continent. In the period 1976-99, the largest trend south of 20°S occurs during the January-March season, is positive, and is centered over southern Brazil. From 1948 to 1975 the trend is also positive, but with less than half the slope. The trend is not due to a systematic change in the timing of the rainy season, which almost always starts before January and usually ends after March, but rather results from an increase in the percent of rainy days, and an increase in the rainy day average. The dynamic causes of the trend are not obvious. It does not appear to be accounted for by an increase in synoptic wave activity in the region. The precipitation trend is related to a positive sea surface temperature trend in the nearby Atlantic Ocean, but apparently not causally. The trend in the Atlantic seems to result from a decrease in mechanical stirring and coastal upwelling associated with a decrease in the strength of the western edge of the circulation associated with the South Atlantic high. © 2004 American Meteorological Society. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v17_n22_p4357_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v17_n22_p4357_Liebmann |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Coastal zones Data reduction Sea level Temperature Coastal upwelling Grids Precipitation (meteorology) air-sea interaction precipitation (climatology) sea surface temperature seasonality trend analysis upwelling Atlantic Ocean Atlantic Ocean (South) oceanic regions South America Western Hemisphere World |
| spellingShingle |
Coastal zones Data reduction Sea level Temperature Coastal upwelling Grids Precipitation (meteorology) air-sea interaction precipitation (climatology) sea surface temperature seasonality trend analysis upwelling Atlantic Ocean Atlantic Ocean (South) oceanic regions South America Western Hemisphere World An observed trend in central South American precipitation |
| topic_facet |
Coastal zones Data reduction Sea level Temperature Coastal upwelling Grids Precipitation (meteorology) air-sea interaction precipitation (climatology) sea surface temperature seasonality trend analysis upwelling Atlantic Ocean Atlantic Ocean (South) oceanic regions South America Western Hemisphere World |
| description |
Seasonal linear trends of precipitation from South American station data, which have been averaged onto grids, are examined, with emphasis on the central continent. In the period 1976-99, the largest trend south of 20°S occurs during the January-March season, is positive, and is centered over southern Brazil. From 1948 to 1975 the trend is also positive, but with less than half the slope. The trend is not due to a systematic change in the timing of the rainy season, which almost always starts before January and usually ends after March, but rather results from an increase in the percent of rainy days, and an increase in the rainy day average. The dynamic causes of the trend are not obvious. It does not appear to be accounted for by an increase in synoptic wave activity in the region. The precipitation trend is related to a positive sea surface temperature trend in the nearby Atlantic Ocean, but apparently not causally. The trend in the Atlantic seems to result from a decrease in mechanical stirring and coastal upwelling associated with a decrease in the strength of the western edge of the circulation associated with the South Atlantic high. © 2004 American Meteorological Society. |
| title |
An observed trend in central South American precipitation |
| title_short |
An observed trend in central South American precipitation |
| title_full |
An observed trend in central South American precipitation |
| title_fullStr |
An observed trend in central South American precipitation |
| title_full_unstemmed |
An observed trend in central South American precipitation |
| title_sort |
observed trend in central south american precipitation |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v17_n22_p4357_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v17_n22_p4357_Liebmann |
| _version_ |
1768544872027914240 |