TITLE

Assessment of Physical Parameterizations Using a Global Climate Model with Stretchable Grid and Nudging

AUTHOR(S)
Coindreau, O.; Hourdin, F.; Haeffelin, M.; Mathieu, A.; Rio, C.
PUB. DATE
April 2007
SOURCE
Monthly Weather Review;Apr2007, Vol. 135 Issue 4, p1474
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The Laboratoire de Météorologie Dynamique atmospheric general circulation model with zooming capability (LMDZ) has been used in a nudged mode to enable comparison of model outputs with routine observations and evaluate the model physical parameterizations. Simulations have been conducted with a stretched grid refined over the vicinity of Paris, France, where observations, collected at the Trappes station (Météo-France) and at the Site Instrumental de Recherche par Télédétection Atmosphérique observatory, are available. For the purpose of evaluation of physical parameterizations, the large-scale component of the modeled circulation is adjusted toward ECMWF analyses outside the zoomed area only, whereas the inside region can evolve freely. A series of sensitivity experiments have been performed with different parameterizations of land surface and boundary layer processes. Compared with previous versions of the LMDZ model, a “thermal plume model,” in association with a constant resistance to evaporation improves agreement with observations. The new parameterization significantly improves the representation of seasonal and diurnal cycles of near-surface meteorology, the day-to-day variability of planetary boundary layer height, and the cloud radiative forcing. This study emphasizes the potential of using a climate model with a nudging and zooming capability to assess model physical parameterizations.
ACCESSION #
25305548

 

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