三峡库区典型样带潜热通量遥感反演与验证
作者简介:罗红霞(1972-),女,副教授,主要从事遥感与GIS应用研究。E-mail:tam_7236@swu.edu.cn
收稿日期: 2013-07-27
要求修回日期: 2013-11-14
网络出版日期: 2014-07-10
基金资助
重庆市自然科学重点基金“基于库周气象数据的三峡水库地表覆被变化气候效应的情景模拟”(2010JJ0069)
Estimation of Latent Heat Flux from Landsat TM Data in the Three Gorges Reservoir Region
Received date: 2013-07-27
Request revised date: 2013-11-14
Online published: 2014-07-10
Copyright
罗红霞 , 邵景安 , 邹扬庆 , 张雪清 . 三峡库区典型样带潜热通量遥感反演与验证[J]. 地球信息科学学报, 2014 , 16(4) : 638 -644 . DOI: 10.3724/SP.J.1047.2014.00638
Due to its close relation with the physical state of ground surface, vegetation status and the change of precipitation, latent heat flux in the Three Gorges Reservoir Region is an important expression of water circulation and energy exchange of ground-air and an important parameter for assessment of climatic effect on regional scale. Taking a part of the Three Gorges Reservoir Region as a typical transect, making use of the timeliness and regional advantages of remote sensing data, and combining with the conventional meteorological data, the quantitative inversion of surface latent heat flux was completed. The contrast verification between the result of remote sensing inversion and FAO Penman-Monteith formula calculated proved the feasibility and reliability of inversion methods based on the relative error. There is a realistic significance for the reservoir area climate scene simulation on the regional scale. Considering the influence of terrain factor fully is conducive to the inversion results closing to the actual values. Further analysis on the spatial distribution of surface latent heat flux in the sample region provided scientific evidence for the climate effect under a changing surface cover. The results show that different surface cover condition appears different latent heat flux, and the spatial distribution of latent heat flux is changing obviously with the change in surface cover, namely, the spatial heterogeneity. For example, the latent heat flux values range from 20 to 80W/m2 in urban residential area and non-vegetation coverage area, 180 to 280 W/m2 in artificial forest, mountain forest, grass, shrub and piedmont farming area, and 420 to 470 W/m2 in water body. In addition, because the surface cover is more complex as well as influenced by undulating landform, the spatial distribution of latent heat flux presents obviously terrain differentiation characteristics.
Fig.1 DEM of the study region图1 研究区DEM |
Fig.2 Land cover of the study region and thedistribution of validation climate stations图2 样带地表覆被及验证气象站点分布 |
Fig.3 Technological roadmap of the study图3 研究技术路线 |
Fig.4 Spatial distribution of Rn in the study region图4 样带地表净辐射通量空间分布 |
Fig.5 Spatial Distribution of G in the study region图5 样带土壤热通量空间分布 |
Fig.6 Histogram of λETd in the study area图6 样带日潜热通量直方图 |
Fig.7 Spatial distribution of λETd in the study area图7 样带日潜热通量空间分布 |
Tab.1 The λET contrast表1 验证站点潜热通量对比 |
站点 | 像元日潜热通量 (MJ·m-2·day-1) | FAO潜热通量 (MJ·m-2·day-1) | 相对误差(%) |
---|---|---|---|
57355 | 18.63 | 22.63 | 17.67 |
57349 | 19.70 | 25.94 | 24.05 |
57348 | 35.02 | 37.69 | 7.08 |
57345 | 19.25 | 25.38 | 24.09 |
57338 | 28.94 | 38.35 | 24.53 |
Fig.8 Spatial distribution of λETd (after unit conversion)in the study area图8 研究区λETd(经单位转换后的)空间分布 |
Fig.9 Spatial distribution of λET in the study area图9 研究区λET空间分布 |
The authors have declared that no competing interests exist.
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