1983~2012年长江流域地表净辐射变化特征

doi:10.11870/cjlyzyyhj201603016

摘要/Abstract

摘要： 本文采用统计相关分析、Morlet小波分析、Rodionov时间序列分析与GIS空间分析等技术方法,分析了1983年7月至2012年9月长江流域SRB和CERES地表净辐射月产品的时空变化特征。结果表明:拟合后遥感产品比气象辐射站点观测值整体高15.8%,平均误差为15.31 W/m²,均方根误差为21.58 W/m²。长江流域地表净辐射多年均值为78.0 W/m²,整体呈下降趋势,于1996年突降,存在16年和10年周期;季相上,呈夏 > 春 > 秋 > 冬。空间上,呈现西部地区 > 东部地区 > 中部地区;1996~2012年相较1983~1995年净辐射整体下降,其中上游流域降幅大于中下游;净辐射降低主要出现在5~7月,降幅较大地区主要是长江上游流域部分地区和长江中游流域纬度较低地区。研究结果对于认识长江流域的气候变化条件下的能量和水分循环过程等具有重要意义。

关键词: SRB, CERES, 长江流域, 地表净辐射, 时空特征变化

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

中图分类号:

P404

潘鑫, 刘元波. 1983~2012年长江流域地表净辐射变化特征[J]. 长江流域资源与环境, 2016, 25(03): 486-496.

PAN Xin, LIU Yuan-bo. SPATIO-TEMPORAL VARIATION OF SURFACE NET RADIATION OVER THE YANGTZE RIVER BASIN DURING 1983-2012[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2016, 25(03): 486-496.

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