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Estimation of Daily Average Downward Shortwave Radiation over Antarctica

1
State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100875, China
2
Beijing Engineering Research Center for Global Land Remote Sensing Products, Institute of Remote Sensing Science and Engineering, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;
3
Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(3), 422; https://doi.org/10.3390/rs10030422
Received: 11 January 2018 / Revised: 19 February 2018 / Accepted: 19 February 2018 / Published: 9 March 2018
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Abstract

Surface shortwave (SW) irradiation is the primary driving force of energy exchange in the atmosphere and land interface. The global climate is profoundly influenced by irradiation changes due to the special climatic condition in Antarctica. Remote-sensing retrieval can offer only the instantaneous values in an area, whilst daily cycle and average values are necessary for further studies and applications, including climate change, ecology, and land surface process. When considering the large values of and small diurnal changes of solar zenith angle and cloud coverage, we develop two methods for the temporal extension of remotely sensed downward SW irradiance over Antarctica. The first one is an improved sinusoidal method, and the second one is an interpolation method based on cloud fraction change. The instantaneous irradiance data and cloud products are used in both methods to extend the diurnal cycle, and obtain the daily average value. Data from South Pole and Georg von Neumayer stations are used to validate the estimated value. The coefficient of determination (R2) between the estimated daily averages and the measured values based on the first method is 0.93, and the root mean square error (RMSE) is 32.21 W/m2 (8.52%). As for the traditional sinusoidal method, the R2 and RMSE are 0.68 and 70.32 W/m2 (18.59%), respectively The R2 and RMSE of the second method are 0.96 and 25.27 W/m2 (6.98%), respectively. These values are better than those of the traditional linear interpolation (0.79 and 57.40 W/m2 (15.87%)). View Full-Text
Keywords: downward shortwave radiation; daily average value; Antarctica; sinusoidal method; cloud fraction; interpolation downward shortwave radiation; daily average value; Antarctica; sinusoidal method; cloud fraction; interpolation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhou, Y.; Yan, G.; Zhao, J.; Chu, Q.; Liu, Y.; Yan, K.; Tong, Y.; Mu, X.; Xie, D.; Zhang, W. Estimation of Daily Average Downward Shortwave Radiation over Antarctica. Remote Sens. 2018, 10, 422.

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