Radiation transfer in stratus clouds at the BSRN Payerne site

Abstract

Clouds represent a major source of uncertainty in understanding climate change, be-cause potential changes in the way they affect the atmospheric and surface energy budget are difficult to predict. It is therefore important to determine how clouds af-fect radiation. Stratiform clouds in particular have an important effect on climate as 5 they cover large areas. This article presents results of radiation transfer calculations with MODTRAN TM for well-defined stratus cloud cases detected at the meteorological station of Payerne, Switzerland. These stratus situations are selected in a data set covering the years from 2000 to 2005 with a method using data widely available at national meteorological observing stations. For 18 single layer stratus situations the 10 shortwave radiation fluxes calculated with MODTRAN TM are compared to surface ob-servations from the Baseline Surface Radiation Network (BSRN) site at Payerne and top of atmosphere (TOA) observations from the Clouds and the Earth's Radiant En-ergy System (CERES) experiment. A median bias on the order of 20 Wm −2 (<9%) was found for the differences between modeled and observed reflected solar radiation at 15 TOA. At the surface, good agreement is obtained by adjusting the vertical extinction in the modeled cloud layer within reasonable limits for a stratus cloud: The median bias of modeled minus observed shortwave downward radiation is well within instrument pre-cision (<1%). The simultaneous agreement of modeled and observed radiation fluxes at the surface and TOA confirmed that radiation transfer in the atmosphere including 20 a single cloud layer can be well simulated with MODTRAN TM . Based on the present results, the absorbance was calculated within the stratus cloud layer (cloud base to cloud top). For the 18 single stratus layer situations the median absorbance is 0.07 [minimum 0.04, maximum 0.1], the median transmittance is 0.29 [0.15 0.39], and the median cloud reflectance is 0.70 [0.63, 0.80].