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A Systematic Study of Longwave Radiative Heating and Cooling within Valleys and Basins Using a Three-Dimensional Radiative Transfer Model

Hoch, S.W. and Whiteman, C.D. and Mayer, B. (2011) A Systematic Study of Longwave Radiative Heating and Cooling within Valleys and Basins Using a Three-Dimensional Radiative Transfer Model. Journal of Applied Meteorology and Climatology, 50, pp. 2473-2489. DOI: 10.1175/JAMC-D-11-083.1.

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Official URL: http://journals.ametsoc.org/doi/pdf/10.1175/JAMC-D-11-083.1

Abstract

The Monte Carlo code for the physically correct tracing of photons in cloudy atmospheres (MYSTIC) three-dimensional radiative transfer model was used in a parametric study to determine the strength of longwave radiative heating and cooling in atmospheres enclosed in idealized valleys and basins. The parameters investigated included valley or basin shape, width, and near-surface temperature contrasts. These parameters were varied for three different representative atmospheric temperature profiles for different times of day. As a result of counterradiation from surrounding terrain, nighttime longwave radiative cooling in topographic depressions was generally weaker than over flat terrain. In the center of basins or valleys with widths exceeding 2 km, cooling rates quickly approached those over flat terrain, whereas the cooling averaged over the entire depression volume was still greatly reduced. Valley or basin shape had less influence on cooling rates than did valley width. Strong temperature gradients near the surface associated with nighttime inversion and daytime superadiabatic layers over the slopes significantly increased longwave radiative cooling and heating rates. Local rates of longwave radiative heating ranged between 230 (i.e., cooling) and 90 K day21. The effects of the near-surface temperature gradients extended tens of meters into the overlying atmospheres. In small basins, the strong influence of nocturnal near-surface temperature inversions could lead to cooling rates exceeding those over flat plains. To investigate the relative role of longwave radiative cooling on total nighttime cooling in a basin, simulations were conducted for Arizona�s Meteor Crater using observed atmospheric profiles and realistic topography. Longwave radiative cooling accounted for nearly 30% of the total nighttime cooling observed in the Meteor Crater during a calm October night.

Document Type:Article
Title:A Systematic Study of Longwave Radiative Heating and Cooling within Valleys and Basins Using a Three-Dimensional Radiative Transfer Model
Authors:
AuthorsInstitution or Email of Authors
Hoch, S.W.Univ. of Utah, Salt Lake City, Utah, USA
Whiteman, C.D.Univ. of Utah, Salt Lake City, Utah, USA
Mayer, B.LMU / DLR
Date:2011
Journal or Publication Title:Journal of Applied Meteorology and Climatology
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:50
DOI:10.1175/JAMC-D-11-083.1
Page Range:pp. 2473-2489
Status:Published
Keywords:radiative transfer, MYSTIC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Jana Freund
Deposited On:02 Jan 2012 14:44
Last Modified:12 Dec 2013 21:32

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