radar-observed spatial and temporal rainfall variability near the tapajós-amazon confluence
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2014
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Abstract
Standard Amazonian rainfall climatologies rely on stations preferentially located near river margins. River breeze circulations that tend to suppress afternoon rainfall near the river and enhance it inland are not typically considered when reporting results. Previous studies found surprising nocturnal rainfall maxima near the rivers in some locations. We examine spatial and temporal rainfall variability in the Santarém region of the Tapajós-Amazon confluence, seeking to describe the importance of breeze effects on afternoon precipitation and defining the areal extent of nocturnal rainfall maxima.We used three years of mean S band radar reflectivity from Santarém airport with a Z-R relationship appropriate for tropical convective conditions. These data were complemented by TRMM satellite rainfall estimates. Nocturnal rainfall was enhanced along the Amazon River, consistent with the hypothesis that these are associated with the passage of instability lines, perhaps enhanced by local channeling and by land breeze convergence. In the daytime, two rainfall bands appear in mean results, along the east bank of the Tapajós River and to the south of the Amazon River, respectively.
| Reference Key |
cohen2014revistaradar-observed
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| Authors | ;Julia Clarinda Paiva Cohen;David Roy Fitzjarrald;Flávio Augusto Farias D'Oliveira;Ivan Saraiva;Illelson Rafael da Silva Barbosa;Adilson Wagner Gandu;Paulo Afonso Kuhn |
| Journal | Applied microbiology and biotechnology |
| Year | 2014 |
| DOI |
10.1590/0102-778620130058
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