Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds
Abstract
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/m 2 , 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 0.018more »
- Authors:
-
- Department of Atmospheric Sciences Texas A&,M University College Station TX USA
- Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor MI USA
- Lawrence Berkeley National Laboratory Berkeley CA USA
- Atmospheric and Environmental Research, Inc Cambridge MA USA
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
- OSTI Identifier:
- 1415147
- Alternate Identifier(s):
- OSTI ID: 1415148; OSTI ID: 1433103
- Grant/Contract Number:
- DE‐SC0013080; AC02-05CH11231; SC0013080; AGS-1632209
- Resource Type:
- Published Article
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 9 Journal Issue: 8; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; longwave scattering; radiative effect of clouds; radiative transfer; doubling CO2; outgoing longwave radiation; simulation biases
Citation Formats
Kuo, Chia‐Pang, Yang, Ping, Huang, Xianglei, Feldman, Daniel, Flanner, Mark, Kuo, Chaincy, and Mlawer, Eli J. Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds. United States: N. p., 2017.
Web. doi:10.1002/2017MS001117.
Kuo, Chia‐Pang, Yang, Ping, Huang, Xianglei, Feldman, Daniel, Flanner, Mark, Kuo, Chaincy, & Mlawer, Eli J. Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds. United States. https://doi.org/10.1002/2017MS001117
Kuo, Chia‐Pang, Yang, Ping, Huang, Xianglei, Feldman, Daniel, Flanner, Mark, Kuo, Chaincy, and Mlawer, Eli J. Fri .
"Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds". United States. https://doi.org/10.1002/2017MS001117.
@article{osti_1415147,
title = {Impact of Multiple Scattering on Longwave Radiative Transfer Involving Clouds},
author = {Kuo, Chia‐Pang and Yang, Ping and Huang, Xianglei and Feldman, Daniel and Flanner, Mark and Kuo, Chaincy and Mlawer, Eli J.},
abstractNote = {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/m 2 , 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 CO 2 under clear‐sky conditions.},
doi = {10.1002/2017MS001117},
journal = {Journal of Advances in Modeling Earth Systems},
number = 8,
volume = 9,
place = {United States},
year = {Fri Dec 29 00:00:00 EST 2017},
month = {Fri Dec 29 00:00:00 EST 2017}
}
https://doi.org/10.1002/2017MS001117
Web of Science
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