Surface irradiances consistent with CERES-derived top-of-atmosphere shortwave and longwave irradiances Kato, Seiji Loeb, Norman G. Rose, Fred G. Doelling, David R. Rutan, David A. Caldwell, Thomas E. Yu, Lisan Weller, Robert A. 2013-06-04T19:30:12Z 2014-10-22T08:57:22Z 2013-05-01
dc.description Author Posting. © American Meteorological Society, 2013. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 26 (2013): 2719–2740, doi:10.1175/JCLI-D-12-00436.1. en_US
dc.description.abstract The estimate of surface irradiance on a global scale is possible through radiative transfer calculations using satellite-retrieved surface, cloud, and aerosol properties as input. Computed top-of-atmosphere (TOA) irradiances, however, do not necessarily agree with observation-based values, for example, from the Clouds and the Earth’s Radiant Energy System (CERES). This paper presents a method to determine surface irradiances using observational constraints of TOA irradiance from CERES. A Lagrange multiplier procedure is used to objectively adjust inputs based on their uncertainties such that the computed TOA irradiance is consistent with CERES-derived irradiance to within the uncertainty. These input adjustments are then used to determine surface irradiance adjustments. Observations by the Atmospheric Infrared Sounder (AIRS), Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO), CloudSat, and Moderate Resolution Imaging Spectroradiometer (MODIS) that are a part of the NASA A-Train constellation provide the uncertainty estimates. A comparison with surface observations from a number of sites shows that the bias [root-mean-square (RMS) difference] between computed and observed monthly mean irradiances calculated with 10 years of data is 4.7 (13.3) W m−2 for downward shortwave and −2.5 (7.1) W m−2 for downward longwave irradiances over ocean and −1.7 (7.8) W m−2 for downward shortwave and −1.0 (7.6) W m−2 for downward longwave irradiances over land. The bias and RMS error for the downward longwave and shortwave irradiances over ocean are decreased from those without constraint. Similarly, the bias and RMS error for downward longwave over land improves, although the constraint does not improve downward shortwave over land. This study demonstrates how synergetic use of multiple instruments (CERES, MODIS, CALIPSO, CloudSat, AIRS, and geostationary satellites) improves the accuracy of surface irradiance computations. en_US
dc.description.embargo 2013-11-01 en_US
dc.description.sponsorship The work was supported by theNASACERES and, in part, Energy Water Cycle Study (NEWS) projects. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Climate 26 (2013): 2719–2740 en_US
dc.identifier.doi 10.1175/JCLI-D-12-00436.1
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.subject Energy budget/balance en_US
dc.subject Radiation budgets en_US
dc.subject Radiative fluxes en_US
dc.subject Radiative transfer en_US
dc.title Surface irradiances consistent with CERES-derived top-of-atmosphere shortwave and longwave irradiances en_US
dc.type Article en_US
dspace.entity.type Publication
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