Utilizing a new soil effective temperature scheme and archived satellite microwave brightness temperature data to estimate surface soil moisture in the Nagqu region, Tibetan Plateau of China
Utilizing a new soil effective temperature scheme and archived satellite microwave brightness temperature data to estimate surface soil moisture in the Nagqu region, Tibetan Plateau of China
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利用新的土壤有效温度方案和卫星微波亮温数据估算青藏高原那曲地区表层土壤湿度
DOI：
10.1007/s40333-017-0075-6
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发表时间：
2018-01
影响因子：
3
通讯作者：
Mudassar IQBAL
中科院分区：
文献类型：
--
作者：
TIAN Hui;Mudassar IQBAL
自2000年代初以来，许多卫星无源微波亮度温度（BT）档案，例如对地观测系统先进微波扫描辐射计（AMSR-E）BT，已成为评估干旱和半干旱地区表层和深层土壤湿度变化的有用资源。在这项研究中，我们使用新的土壤有效温度 (Teff) 方案和存档的 AMSR-E BT 来估算中国青藏高原中部那曲地区的表面土壤湿度 (SM)。计算区域尺度 Teff 所需的表面和深层土壤温度是从社区土地模型版本 4.5 (CLM4.5) 的输出中获得的。在CEOP-CAMP/Tibet（青藏高原亚澳季风协调增强观测项目）实验点进行的原位SM测量被用来在区域和单点尺度上验证基于AMSR-E的SM估计。此外，2004年7月那曲地区16次白天AMSR-E BT观测得到了那曲地区月平均地表SM的空间分布。结果表明，基于 AMSR-E 的地表 SM 估计与基于原位的地表 SM 测量结果吻合较好，夜间和白天的均方根误差 (RMSE) 范围为 0.042 至 0.066 m3/m3，决定系数 (R2) 范围为 0.71 至 0.92。区域表层土壤水状态图呈现出与地形相关的清晰的空间格局。表明,较低的地表SM值出现在那曲地区北部、中西部和东南部山区,而较高的地表SM值则出现在那曲地区中部的通天河流域、纳木错湖、沼泽草甸等低海拔地区。我们的分析还表明，新的 Teff 方案不需要特殊的拟合参数或额外的假设，这简化了区域规模应用的数据要求。该方案与存档的卫星被动微波BT观测相结合，可用于估算青藏高原地区水文过程研究的历史地表SM。
Since the early 2000s, many satellite passive microwave brightness temperature (BT) archives, such as the Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) BTs, have become the useful resources for assessing the changes in the surface and deep soil moistures over both arid and semi-arid regions. In this study, we used a new soil effective temperature (Teff) scheme and the archived AMSR-E BTs to estimate surface soil moisture (SM) over the Nagqu region in the central Tibetan Plateau, China. The surface and deep soil temperatures required for the calculation of regional-scale Teff were obtained from outputs of the Community Land Model version 4.5 (CLM4.5). In situ SM measurements at the CEOP-CAMP/Tibet (Coordinated Enhanced Observing Period Asia-Australia Monsoon Project on the Tibetan Plateau) experimental sites were used to validate the AMSR-E-based SM estimations at regional and single-site scales. Furthermore, the spatial distribution of monthly mean surface SM over the Nagqu region was obtained from 16 daytime AMSR-E BT observations in July 2004 over the Nagqu region. Results revealed that the AMSR-E-based surface SM estimations agreed well with the in situ-based surface SM measurements, with the root mean square error (RMSE) ranging from 0.042 to 0.066 m3/m3 and the coefficient of determination (R2) ranging from 0.71 to 0.92 during the nighttime and daytime. The regional surface soil water state map showed a clear spatial pattern related to the terrain. It indicated that the lower surface SM values occurred in the mountainous areas of the northern, mid-western and southeastern parts of Nagqu region, while the higher surface SM values appeared in the low elevation areas such as the Tongtian River Basin, Namco Lake and bog meadows in the central part of Nagqu region. Our analysis also showed that the new Teff scheme does not require special fitting parameters or additional assumptions, which simplifies the data requirements for regional-scale applications. This scheme combined with the archived satellite passive microwave BT observations can be used to estimate the historical surface SM for hydrological process studies over the Tibetan Plateau regions.
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DOI：
10.1007/978-3-030-03017-9_9
发表时间：
2018-12
期刊：
Environmental Geoinformatics
影响因子：
--
作者：
J. Awange;J. Kiema
通讯作者：
J. Awange;J. Kiema
DOI：
10.1145/1874391.187410
发表时间：
1987-02
期刊：
ACM SIGSOFT Softw. Eng. Notes
影响因子：
--
作者：
Will Tribbey
通讯作者：
Will Tribbey
DOI：
--
发表时间：
1982-08
期刊：
--
影响因子：
--
作者：
F. Ulaby;R. Moore;A. Fung
通讯作者：
F. Ulaby;R. Moore;A. Fung
DOI：
10.1002/2015jd023305
发表时间：
2015-04
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
Nadine Nicolai-Shaw;M. Hirschi;H. Mittelbach;S. Seneviratne
通讯作者：
Nadine Nicolai-Shaw;M. Hirschi;H. Mittelbach;S. Seneviratne
DOI：
10.1109/tgrs.1985.289498
发表时间：
1985-01-01
影响因子：
8.2
作者：
DOBSON, MC;ULABY, FT;ELRAYES, MA
通讯作者：
ELRAYES, MA