What drives daily precipitation over the central Amazon? Differences observed between wet and dry seasons
<p>This study offers an alternative presentation regarding how diurnal precipitation is modulated by convective events that developed over the central Amazon during the preceding nighttime period. We use data collected during the Observations and Modelling of the Green Ocean Amazon (GoAmazon 2...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/21/6735/2021/acp-21-6735-2021.pdf |
| Summary: | <p>This study offers an alternative presentation regarding
how diurnal precipitation is modulated by convective events that developed
over the central Amazon during the preceding nighttime period. We use data
collected during the Observations and Modelling of the Green Ocean Amazon
(GoAmazon 2014/2015) field campaign that took place from 1 January 2014
to 30 November 2015 in the central Amazon. Local surface-based
observations of cloud occurrence, soil temperature, surface fluxes, and
planetary boundary layer characteristics are coupled with satellite data to
identify the physical mechanisms that control the diurnal rainfall in
central Amazon during the wet and dry seasons. This is accomplished through
evaluation of the atmospheric properties during the nocturnal periods
preceding raining and non-raining events. Comparisons between these
non-raining and raining transitions are presented for the wet (January to
April) and dry (June to September) seasons. The results suggest that
wet-season diurnal precipitation is modulated by nighttime cloud coverage and
local influences such as heating induced turbulence, whereas the dry-season
rain events are controlled by large-scale circulations.</p> |
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| ISSN: | 1680-7316 1680-7324 |