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Tilt Error in Cryospheric Surface Radiation Measurements at High Latitudes: a Model Study : Volume 9, Issue 4 (18/08/2015)

By Bogren, W. S.

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Book Id: WPLBN0004023251
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: Tilt Error in Cryospheric Surface Radiation Measurements at High Latitudes: a Model Study : Volume 9, Issue 4 (18/08/2015)  
Author: Bogren, W. S.
Volume: Vol. 9, Issue 4
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Kylling, A., Burkhart, J. F., & Bogren, W. S. (2015). Tilt Error in Cryospheric Surface Radiation Measurements at High Latitudes: a Model Study : Volume 9, Issue 4 (18/08/2015). Retrieved from

Description: NILU – Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway. We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in-situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response foreoptic. Emphasis is placed on assessing total error over the solar shortwave spectrum from 250 to 4500 nm, as well as supporting investigation over other relevant shortwave spectral ranges. The total measurement error introduced by sensor tilt is dominated by the direct component. For a typical high latitude albedo measurement with a solar zenith angle of 60°, a sensor tilted by 1, 3, and 5° can respectively introduce up to 2.6, 7.7, and 12.8 % error into the measured irradiance and similar errors in the derived albedo. Depending on the daily range of solar azimuth and zenith angles, significant measurement error can persist also in integrated daily irradiance and albedo.

Tilt error in cryospheric surface radiation measurements at high latitudes: a model study

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