A New Mechanism for the Dependence of Tropical Convection on Free‐Tropospheric Humidity

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Virman , M , Bister , M , Sinclair , V A , Järvinen , H & Räisänen , J 2018 , ' A New Mechanism for the Dependence of Tropical Convection on Free‐Tropospheric Humidity ' , Geophysical Research Letters , vol. 45 , no. 5 , pp. 2516–2523 . https://doi.org/10.1002/2018GL077032

Title: A New Mechanism for the Dependence of Tropical Convection on Free‐Tropospheric Humidity
Author: Virman, M.; Bister, M.; Sinclair, V. A.; Järvinen, H.; Räisänen, J.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-03-16
Language: eng
Number of pages: 8
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
URI: http://hdl.handle.net/10138/298276
Abstract: Atmospheric deep convection is responsible for transport of the most important greenhouse gas, water vapor, to the free-troposphere and for most of the precipitation on Earth. Observations show that deep convection is strongly sensitive to the amount of moisture in the low-to-midtroposphere. The current understanding is that this sensitivity is due to entrainment. In this study, it is found that over tropical oceans shallow warm anomalies, likely strong enough to hinder subsequent convection, are observed just above the boundary layer after precipitation, but only where the low-to-midtroposphere is dry. The results, showing a cold anomaly above the warm anomaly, suggest that evaporation of stratiform precipitation and subsidence warming below likely cause these temperature anomalies. Evaporation of stratiform precipitation should therefore be a topic of high priority for developing more realistic theories of convective weather phenomena and for improving climate and weather forecast models.
Subject: 1172 Environmental sciences
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