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Vertical Heat Fluxes Generated by Mesoscale Atmospheric Flow Induced by Thermal Inhomogeneities in the PBL
- Source :
- Journal of the Atmospheric Sciences. 50:919-926
- Publication Year :
- 1993
- Publisher :
- American Meteorological Society, 1993.
-
Abstract
- An analytical evaluation of the vertical heat fluxes associated with the mesoscale flow generated by thermal inhomogeneities in the PBL in the absence of a synoptic wind is presented. Results show that the mesoscale fluxes are of the same order as the diabatic heat fluxes. In the sea-breeze case results show that in the lower layer of the atmosphere the heat flux is positive over the land and negative over the sea with an overall positive horizontal average. In the free atmosphere above the PBL the mesoscale vertical heat flux is negative over the land and over the sea; that is, the lower atmosphere becomes warmer while the free atmosphere above becomes cooler. As a result the mesoscale flow contributes to the weakening of the atmospheric stability within a region that extends a Rossby radius distance from the coastline, and up to an altitude larger than twice the depth of the convective PBL. The average momentum flux equals zero because the momentum removed over the sea is fed back into the atmo...
- Subjects :
- Convection
Atmospheric Science
Meteorology
Planetary boundary layer
Mesoscale meteorology
Sensible heat
Atmospheric sciences
Atmosphere
Heat flux
Sea breeze
Atmospheric instability
Astrophysics::Solar and Stellar Astrophysics
Environmental science
Astrophysics::Earth and Planetary Astrophysics
Physics::Atmospheric and Oceanic Physics
Subjects
Details
- ISSN :
- 15200469 and 00224928
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Journal of the Atmospheric Sciences
- Accession number :
- edsair.doi...........9ccef1450978c597ce5f0454709b4d1e