RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (03): 486-496.doi: 10.11870/cjlyzyyhj201603016

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SPATIO-TEMPORAL VARIATION OF SURFACE NET RADIATION OVER THE YANGTZE RIVER BASIN DURING 1983-2012

PAN Xin1,2,3, LIU Yuan-bo1,2   

  1. 1. Key Laboratory of Watershed Geographic Sciences, Nanjing 210008, China;
    2. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-07-25 Revised:2014-12-29 Online:2016-03-20
  • Supported by:
    the State Key Program of National Science Foundation of China (41430855);the 973 Program of National Basic Research Program of China(2012CB417000);the Key Program of Nanjing Institute of Geography and Limnologyof the ChineseAcademy of Sciences (NIGLAS2012135001)

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Abstract: Surface net radiation is the main energy source which drives atmospheric movement. It determinates evapotranspiration,photosynthesis and the temperature of the Earth's surface and atmosphere, and plays an important role in the interactions between the surface and the atmosphere. This paper addresses the spatio-temporal variation of surface net radiationusing satellite-retrieved flux data over the Yangtze River Basin during 1983.7-2012.9. The data are composed of the surface radiation budget (SRB) and the Clouds and the Earth's Radiant Energy System (CERES) products. Statistical correlation analysis, Morlet wavelet analysis, Rodionovtime series analysis and GIS spatial analysis are applied. Our evaluation showed that the fittingsatellite-retrieved surface net radiationagreed well with meteorological observations, with an overestimation of 15.8%, with a mean error of 15.31 W/m2, and a root mean square error of 21.58 W/m2(more than 99.99 percent confidence level). The accuracy of the fitting data meets the requirement of regional atmospheric research.From a spatial perspective, the maximum net radiation appeared at the western part of the Yangtze River Basin, followed by the eastern and the middle parts. The net radiationhad seasonal variations with a maximum in summer and a minimum in winter (a maximum value of 120.5 W/m2 in July and a minimum value of 32.1 W/m2 in December). The dominant inter-annual cycles include 16 and 10 year. From 1983.7 to 2012.9, the multi-year mean of surface net radiation was 78.0 W/m2, and it had a decreasing trend with an abrupt decline in 1996. Net radiation d uring 1996-2012 is less than that during 1983-1995 in all the Yangtze River Basin, with more decrease in the upper reaches than in the middle and lower reaches of river basin. The reduction mainly happened from May to July, especially in June with a reduction of up to 20 W/m2. The main regions with a large reduction of surface net radiation are the upper reaches and the low latitude regions of the middle and lower reaches of the Yangtze River Basin. Overall, the present study is valuable for understanding of the energy and water cycles in the Yangtze River Basin.

Key words: SRB, CERES, Yangtze River Basin, surface net radiation, spatio-temporal variation

CLC Number: 

  • P404
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