NDLI: Using CERES Data to Evaluate the Infrared Flux Derived From Diffusivity Approximation

Content Provider	IEEE Xplore Digital Library
Author	Wenbo Sun Yongxiang Hu Loeb, N.G. Bing Lin Mlynczak, M.G.
Copyright Year	2004
Abstract	Based on the diffusivity approximation theory, the infrared flux at the top of atmosphere (TOA) can be obtained by multiplying a factor of pi on the infrared radiance that was measured at a viewing zenith angle (VZA) of 53^deg. This letter applies the diffusivity approximation on radiance measurements of the Clouds and the Earth's Radiant Energy System (CERES) to derive TOA infrared fluxes and compares these fluxes with the state-of-the-art CERES outgoing radiative fluxes. We find that the mean difference between the two kinds of instantaneous flux that were estimated at the window channel is ~ 1 Wmiddotm^-2, with a root-mean-square error of ~ 1.7 Wmiddotm^-2. This result shows that radiance measurement at a fixed VZA of 53 ^deg is a simple and effective method in the remote sensing of the infrared flux for satellite missions that monitor some specific climate processes and require longwave/window TOA fluxes, such as the Broad Band Radiometer instrument on EarthCARE; however, this approach may involve errors from an inhomogeneous scene or non-Lambertian emission of the surface. A careful design of the VZA and scan mode, such as a conical scan at 53^deg, would produce much more convenient infrared flux measurements for the Earth-atmosphere system than other designs.
Sponsorship	IEEE Geoscience and Remote Sensing Society
Starting Page	17
Ending Page	20
Page Count	4
File Size	283169
File Format	PDF
ISSN	1545598X
Volume Number	5
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atmospheric measurements Remote monitoring Approximation methods Atmosphere Energy measurement Clouds Earth Infrared surveillance Satellite broadcasting Radiometry infrared flux Clouds and the Earth's Radiant Energy System (CERES) diffusivity approximation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Geotechnical Engineering and Engineering Geology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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