摘要
基于Terra-MODIS L3级产品(MOD11C3),研究江汉平原区域比辐射率在一年四季的变化特征。结果表明,江汉平原区域的比辐射率值在1 a内整体处于一个稳定的区间,相比其他三季,冬季高比辐射率区间所占面积有明显增加,同时存在多种类别的比辐射率值;春季和冬季的平均比辐射率值最高,夏季最低,秋季比辐射率值居夏冬两季之中。对不同土地覆被类型的比辐射率值的研究表明,水田和水域的比辐射率值最高,建设用地比辐射率值最低但波动较大,林地和草地的比辐射率值最为稳定,耕地的比辐射率值明显高于自然植被;各种地类的比辐射率年变化趋势基本一致,均在夏季出现波谷,秋季呈上升趋势,冬季有小幅的波动,春季最稳定。
We researched the land surface emissivity four seasons changes in Jianghan Plain, based on MOD11C3 of Terra-MODIS L3 level products in this paper. The results show that, emissivity value of Jianghan Plain within a year in a stable range, middle-high emissivity(0.973 6~0.974 5) and high emissivity(0.974 6~0.976 1) region makes up of 70%~90% of Jianghan Plain land surface area. The high emissivity region area in winter has a big increase than the other three seasons, and also includes more categories. Winter and spring have a relatively high value of emissivity than summer and autumn. Summer has the lowest value. Another research of emissivity value on different land cover types shows that, paddy fi eld and waters have the highest emissivity value, construction land has the lowest emissivity value with the biggest fluctuations. The most stable land cover types are forest and grass, arable land's emissivity values have a significantly higher than the natural vegetation. Each land cover type has the lowest emissivity value in summer, a trend of rising in autumn, a stable value in spring. MODIS11C3 product has a low resolution, can only satisfy a wide range of temperature's estimation and analysis, and is not sensitive enough to reflect the region-wide emissivity.
出处
《地理空间信息》
2015年第5期69-71,78,共4页
Geospatial Information
基金
全球变化研究国家重大科学研究计划资助项目(2010CB950902)
