Role of surface heat fluxes underneath cold pools
| Autor: | Alix Garelli, Pierre Gentine, Ji Nie, Giuseppe Torri, Seung-Bu Park, Zhiming Kuang |
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| Rok vydání: | 2015 |
| Předmět: |
Mass flux
Entrainment (hydrodynamics) Convection Atmospheric Science 010504 meteorology & atmospheric sciences surface fluxes Astrophysics::High Energy Astrophysical Phenomena 0208 environmental biotechnology entrainment 02 engineering and technology Atmospheric sciences 01 natural sciences Convective Processes Flux (metallurgy) cold pools Front velocity Research Letter Physics::Atmospheric and Oceanic Physics convection 0105 earth and related environmental sciences Turbulence Nonlinear Geophysics Front (oceanography) Tropical Meteorology Humidity mass flux Research Letters 020801 environmental engineering Geophysics Atmospheric Processes General Earth and Planetary Sciences Environmental science Clouds and Cloud Feedbacks |
| Zdroj: | Geophysical Research Letters |
| ISSN: | 0094-8276 |
| Popis: | 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. Key Points Cold pools are affected by surface heat fluxesConvection over the ocean and land is differentially affected by surface heat fluxes on cold poolsFlux boundary conditions for convection generally give unrealistic convection organization |
| Databáze: | OpenAIRE |
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