Cold pool dissipation

Grant, Leah D.; van den Heever, Susan C.

doi:10.1002/2015JD023813

Cold pool dissipation

Journal Article · Sat Feb 06 00:00:00 EST 2016 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1002/2015JD023813· OSTI ID:1402198

Grant, Leah D. ^[1]; van den Heever, Susan C. ^[1]

Department of Atmospheric Science Colorado State University Fort Collins Colorado USA

Abstract

The mechanisms by which sensible heat fluxes (SHFs) alter cold pool characteristics and dissipation rates are investigated in this study using idealized two‐dimensional numerical simulations and an environment representative of daytime, dry, continental conditions. Simulations are performed with no SHFs, SHFs calculated using a bulk formula, and constant SHFs for model resolutions with horizontal (vertical) grid spacings ranging from 50 m (25 m) to 400 m (200 m). In the highest resolution simulations, turbulent entrainment of environmental air into the cold pool is an important mechanism for dissipation in the absence of SHFs. Including SHFs enhances cold pool dissipation rates, but the processes responsible for the enhanced dissipation differ depending on the SHF formulation. The bulk SHFs increase the near‐surface cold pool temperatures, but their effects on the overall cold pool characteristics are small, while the constant SHFs influence the near‐surface environmental stability and the turbulent entrainment rates into the cold pool. The changes to the entrainment rates are found to be the most significant of the SHF effects on cold pool dissipation. SHFs may also influence the timing of cold pool‐induced convective initiation by altering the environmental stability and the cold pool intensity. As the model resolution is coarsened, cold pool dissipation is found to be less sensitive to SHFs. Furthermore, the coarser resolution simulations not only poorly but sometimes wrongly represent the SHF impacts on the cold pools. Recommendations are made regarding simulating the interaction of cold pools with convection and the land surface in cloud‐resolving models.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010569

OSTI ID:: 1402198

Journal Information:: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 3 Vol. 121; ISSN 2169-897X

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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