Fog and rain in the Amazon

Proceedings of the National Academy of Sciences of the United States of America
Usama AnberAdam H Sobel

Abstract

The diurnal and seasonal water cycles in the Amazon remain poorly simulated in general circulation models, exhibiting peak evapotranspiration in the wrong season and rain too early in the day. We show that those biases are not present in cloud-resolving simulations with parameterized large-scale circulation. The difference is attributed to the representation of the morning fog layer, and to more accurate characterization of convection and its coupling with large-scale circulation. The morning fog layer, present in the wet season but absent in the dry season, dramatically increases cloud albedo, which reduces evapotranspiration through its modulation of the surface energy budget. These results highlight the importance of the coupling between the energy and hydrological cycles and the key role of cloud albedo feedback for climates over tropical continents.

References

Jun 14, 2013·Proceedings. Biological Sciences·Jung-Eun LeeSassan Saatchi
Aug 21, 2013·Nature·Markus ReichsteinMartin Wattenbach
Mar 6, 2015·Nature Communications·Benoit P GuillodSonia I Seneviratne

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Citations

Jun 27, 2018·Annals of the New York Academy of Sciences·Diego G MirallesAdriaan J Teuling
Sep 1, 2017·Nature Communications·Anders AhlströmRobert B Jackson
May 29, 2017·Nature Geoscience·Julia K GreenPierre Gentine

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