Parameterization of solar radiation from model and observations.

Lengfeld, Katharina, Macke, Andreas, Feister, Uwe and Güldner, Jürgen (2010) Parameterization of solar radiation from model and observations. Open Access Meteorologische Zeitschrift, 19 (1). pp. 25-33. DOI 10.1127/0941-2948/2010/0423.

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Abstract

The influence of the external and internal structure of clouds on the incoming solar radiation cannot yet be included in parameterizations used in numerical models. Based on numerical simulations, SCHEWSKI and MACKE (2003) (Schewski-parameterization) have shown that a robust link exists between the domain averaged cloud and the domain averaged solar broadband radiation fluxes, despite the 3d nature of the cloud fields involved. The present work revisits this approach with observed cloud (cloud cover and liquid water path) and radiation (downwelling shortwave radiative flux) properties obtained from the Richard Assmann Observatory (RAO) of the German Weather Service in Lindenberg. Applying the original (model based) cloud-radiation parameterization by SCHEWSKI and MACKE (2001) to observed domain averaged cloud fields yields an overall good correlation between observed and parameterized downwelling solar radiation fluxes. However, the parameterized fluxes strongly underestimate the observations. The Schewski parameterization has been modified by removing the bias and re-adjusting the parameterization coefficients to match the observed cloud and radiation correlation. Furthermore, the empirical parameterization by ZILLMAN (1972) has been implemented for describing the clear conditions. Applying the new parameterization to an independent data set provides significant improvements. However, the accuracy remains in the order of previously used one-or two-parameter empirical cloud-radiation parameterizations. We conclude that cloud cover and liquid water path, i.e. those data that are available from large scale climate models, cannot be regarded as sufficient to describe the cloud radiative effect at the surface.

Document Type: Article
Keywords: Meteorology; CLOUD LIQUID WATER; MIXED-PHASE CLOUDS; MICROWAVE RADIOMETRY; SEA-SURFACE; PARAMETRIZATION; TEMPERATURE; LINDENBERG; FLUXES; PART
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1127/0941-2948/2010/0423
ISSN: 0941-2948
Date Deposited: 11 Jan 2012 06:41
Last Modified: 05 Jul 2018 10:06
URI: http://oceanrep.geomar.de/id/eprint/13363

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