meteorological context of the onset and end of the rainy season in central amazonia during the goamazon2014/5
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2017
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Abstract
The onset and demise of the rainy season in Amazonia are assessed
in this study using meteorological data from the GoAmazon experiment, with a
focus on the 2014–2015 rainy season. In addition, global reanalyses are
also used to identify changes in circulation leading to the establishment of
the rainy season in the region. Our results show that the onset occurred in
January 2015, 2–3 pentads later than normal, and the rainy season during the
austral summer of 2015 contained several periods with consecutive dry days in
both Manacapuru and Manaus, which are not common for the wet season, and
resulted in below-normal precipitation. The onset of the rainy season has
been strongly associated with changes in large-scale weather conditions in
the region due to the effect of the Madden–Julian Oscillation (MJO). Regional
thermodynamic indices and the height of the boundary layer did not present a
significant difference between the onset and demise of the wet season of
2015. This suggests that local changes, such as those in the regional thermodynamic
characteristics, may not have influenced its onset. Thus, variability of the
large-scale circulation was responsible for regional convection and rainfall
changes in Amazonia during the austral summer of 2014–2015.
| Reference Key |
marengo2017atmosphericmeteorological
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|---|---|
| Authors | ;J. A. Marengo;G. F. Fisch;L. M. Alves;N. V. Sousa;R. Fu;Y. Zhuang;Y. Zhuang |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-7671-2017
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| URL | |
| Keywords |
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