Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds

Autor:	Chaincy Kuo, Mark Flanner, Daniel Feldman, Eli J. Mlawer, Xianglei Huang, Chia Pang Kuo, Ping Yang
Rok vydání:	2017
Předmět:	Earth's energy budget 010504 meteorology & atmospheric sciences Atmospheric sciences 01 natural sciences Atmospheric Sciences 010309 optics Affordable and Clean Energy 0103 physical sciences Radiative transfer Environmental Chemistry Physics::Atmospheric and Oceanic Physics longwave scattering 0105 earth and related environmental sciences simulation biases Physics outgoing longwave radiation Global and Planetary Change Scattering Longwave Radiant energy Spectral bands Lidar radiative transfer radiative effect of clouds General Earth and Planetary Sciences Outgoing longwave radiation doubling CO2
Zdroj:	Journal of Advances in Modeling Earth Systems, vol 9, iss 8 Kuo, CP; Yang, P; Huang, X; Feldman, D; Flanner, M; Kuo, C; et al.(2017). Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds. Journal of Advances in Modeling Earth Systems, 9(8), 3082-3098. doi: 10.1002/2017MS001117. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/98w101vp
ISSN:	1942-2466
DOI:	10.1002/2017ms001117
Popis:	Author(s): Kuo, CP; Yang, P; Huang, X; Feldman, D; Flanner, M; Kuo, C; Mlawer, EJ | Abstract: General circulation models (GCMs) are extensively used to estimate the influence of clouds on the global energy budget and other aspects of climate. Because radiative transfer computations involved in GCMs are costly, it is typical to consider only absorption but not scattering by clouds in longwave (LW) spectral bands. In this study, the flux and heating rate biases due to neglecting the scattering of LW radiation by clouds are quantified by using advanced cloud optical property models, and satellite data from Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), CloudSat, Clouds and the Earth's Radiant Energy System (CERES), and Moderate Resolution Imaging Spectrometer (MODIS) merged products (CCCM). From the products, information about the atmosphere and clouds (microphysical and buck optical properties, and top and base heights) is used to simulate fluxes and heating rates. One-year global simulations for 2010 show that the LW scattering decreases top-of-atmosphere (TOA) upward flux and increases surface downward flux by 2.6 and 1.2 W/m2, respectively, or approximately 10% and 5% of the TOA and surface LW cloud radiative effect, respectively. Regional TOA upward flux biases are as much as 5% of global averaged outgoing longwave radiation (OLR). LW scattering causes approximately 0.018 K/d cooling at the tropopause and about 0.028 K/d heating at the surface. Furthermore, over 40% of the total OLR bias for ice clouds is observed in 350–500 cm−1. Overall, the radiative effects associated with neglecting LW scattering are comparable to the counterpart due to doubling atmospheric CO2 under clear-sky conditions.
Databáze:	OpenAIRE
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