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Title: Role of surface heat fluxes underneath cold pools

In this paper, the role of surface heat fluxes underneath cold pools is investigated using cloud–resolving simulations with either interactive or horizontally homogenous surface heat fluxes over an ocean and a simplified land surface. Over the ocean, there are limited changes in the distribution of the cold pool temperature, humidity, and gust front velocity, yet interactive heat fluxes induce more cold pools, which are smaller, and convection is then less organized. Correspondingly, the updraft mass flux and lateral entrainment are modified. Over the land surface, the heat fluxes underneath cold pools drastically impact the cold pool characteristics with more numerous and smaller pools, which are warmer and more humid and accompanied by smaller gust front velocities. The interactive fluxes also modify the updraft mass flux and reduce convective organization. These results emphasize the importance of interactive surface fluxes instead of prescribed flux boundary conditions, as well as the formulation of surface heat fluxes, when studying convection.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Columbia Univ., New York, NY (United States)
  2. Harvard Univ., Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
SC0008720; SC0011094; SC0014203; NNX14AI36G
Type:
Published Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 2; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Columbia Univ., New York, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1235747
Alternate Identifier(s):
OSTI ID: 1235748; OSTI ID: 1435624

Gentine, Pierre, Garelli, Alix, Park, Seung -Bu, Nie, Ji, Torri, Giuseppe, and Kuang, Zhiming. Role of surface heat fluxes underneath cold pools. United States: N. p., Web. doi:10.1002/2015GL067262.
Gentine, Pierre, Garelli, Alix, Park, Seung -Bu, Nie, Ji, Torri, Giuseppe, & Kuang, Zhiming. Role of surface heat fluxes underneath cold pools. United States. doi:10.1002/2015GL067262.
Gentine, Pierre, Garelli, Alix, Park, Seung -Bu, Nie, Ji, Torri, Giuseppe, and Kuang, Zhiming. 2016. "Role of surface heat fluxes underneath cold pools". United States. doi:10.1002/2015GL067262.
@article{osti_1235747,
title = {Role of surface heat fluxes underneath cold pools},
author = {Gentine, Pierre and Garelli, Alix and Park, Seung -Bu and Nie, Ji and Torri, Giuseppe and Kuang, Zhiming},
abstractNote = {In this paper, the role of surface heat fluxes underneath cold pools is investigated using cloud–resolving simulations with either interactive or horizontally homogenous surface heat fluxes over an ocean and a simplified land surface. Over the ocean, there are limited changes in the distribution of the cold pool temperature, humidity, and gust front velocity, yet interactive heat fluxes induce more cold pools, which are smaller, and convection is then less organized. Correspondingly, the updraft mass flux and lateral entrainment are modified. Over the land surface, the heat fluxes underneath cold pools drastically impact the cold pool characteristics with more numerous and smaller pools, which are warmer and more humid and accompanied by smaller gust front velocities. The interactive fluxes also modify the updraft mass flux and reduce convective organization. These results emphasize the importance of interactive surface fluxes instead of prescribed flux boundary conditions, as well as the formulation of surface heat fluxes, when studying convection.},
doi = {10.1002/2015GL067262},
journal = {Geophysical Research Letters},
number = 2,
volume = 43,
place = {United States},
year = {2016},
month = {1}
}