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Tropical gravity wave momentum fluxes and latent heating distributions

Citation

Geller, MA and Zhou, T and Love, PT, Tropical gravity wave momentum fluxes and latent heating distributions, Journal of The Atmospheric Sciences, 72, (July) pp. 2762-2768. ISSN 0022-4928 (2015) [Refereed Article]


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DOI: doi:10.1175/JAS-D-15-0020.1

Abstract

Recent satellite determinations of global distributions of absolute gravity wave (GW) momentum fluxes in the lower stratosphere show maxima over the summer subtropical continents and little evidence of GW momentum fluxes associated with the intertropical convergence zone (ITCZ). This seems to be at odds with parameterizations for GW momentum fluxes, where the source is a function of latent heating rates, which are largest in the region of the ITCZ in terms of monthly averages. The authors have examined global distributions of atmospheric latent heating, cloud-top-pressure altitudes, and lower-stratosphere absolute GW momentum fluxes and have found that monthly averages of the lower-stratosphere GW momentum fluxes more closely resemble the monthly mean cloud-top altitudes rather than the monthly mean rates of latent heating. These regions of highest cloud-top altitudes occur when rates of latent heating are largest on the time scale of cloud growth. This, plus previously published studies, suggests that convective sources for stratospheric GW momentum fluxes, being a function of the rate of latent heating, will require either a climate model to correctly model this rate of latent heating or some ad hoc adjustments to account for shortcomings in a climate model’s land–sea differences in convective latent heating.

Item Details

Item Type:Refereed Article
Keywords:gravity waves, deep convection, momentum flux
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Tropospheric and Stratospheric Physics
Objective Division:Environment
Objective Group:Atmosphere and Weather
Objective Field:Atmospheric Processes and Dynamics
Author:Love, PT (Dr Peter Love)
ID Code:121592
Year Published:2015
Web of Science® Times Cited:4
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-10-04
Last Modified:2017-11-10
Downloads:3 View Download Statistics

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