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An Observed Trend in Central South American Precipitation
Open accessAbstract
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.
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Cited by
Toward a Unified View of the American Monsoon Systems
Vera, C., Higgins, W., Amador, J., Ambrizzi, T., Garreaud, R., Gochis, D., Gutzler, D., Lettenmaier, D., Marengo, J., Mechoso, C. R., et al. (2006) · Journal of Climate · doi:10.1175/jcli3896.1 · Cited by 906
Self-citationHaylock, M. R., Peterson, T. C., Alves, L. M., Ambrizzi, T., Anunciação, Y. M. T., Baez, J., Barros, V. R., Berlato, M. A., Bidegain, M., Coronel, G., et al. (2006) · Journal of Climate · doi:10.1175/jcli3695.1 · Cited by 719
Self-citationTropical drying trends in global warming models and observations
Neelin, J. D., Münnich, M., Su, H., Meyerson, J. E., & Holloway, C. E. (2006) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0601798103 · Cited by 498
Millennial‐scale precipitation changes in southern Brazil over the past 90,000 years
Wang, X., Auler, A. S., Edwards, R. L., Cheng, H., Ito, E., Wang, Y., Kong, X., & Solheid, M. (2007) · Geophysical Research Letters · doi:10.1029/2007gl031149 · Cited by 330
Interhemispheric anti-phasing of rainfall during the last glacial period
Wang, X., Auler, A. S., Edwards, R. L., Cheng, H., Ito, E., & Solheid, M. (2006) · Quaternary Science Reviews · doi:10.1016/j.quascirev.2006.02.009 · Cited by 306
Metadata
- Authors
- Liebmann, B., Vera, C. S., Carvalho, L. M. V., Camilloni, I. A., Hoerling, M. P., Allured, D., Barros, V. R., Báez, J., & Bidegain, M.
- Venue
- Journal of Climate
- Publisher
- American Meteorological Society
- Published
- 2004-11-15
- Volume
- 17
- Issue
- 22
- Pages
- 4357-4367
- ISSN
- 0894-8755 (ISSN-L)
- 1520-0442
- OpenAlex
- W1567153305
- Cited by
- 192
- References
- 0
- FWCI
- 4.72
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Liebmann, B., Vera, C. S., Carvalho, L. M. V., Camilloni, I. A., Hoerling, M. P., Allured, D., Barros, V. R., Báez, J., & Bidegain, M. (2004). An Observed Trend in Central South American Precipitation. Journal of Climate. https://doi.org/10.1175/3205.1
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