干旱区生态环境知识资源中心(Arid): Evaluation of the SMOS and SMAP soil moisture products under different vegetation types against two sparse in situ networks over arid mountainous watersheds, Northwest China

Arid

DOI	10.1007/s11430-018-9308-9
	Evaluation of the SMOS and SMAP soil moisture products under different vegetation types against two sparse in situ networks over arid mountainous watersheds, Northwest China
	Zhang, Lanhui 1; He, Chansheng 1,2; Zhang, Mingmin 1; Zhu, Yi 1
通讯作者	He, Chansheng
来源期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
EISSN	1869-1897
出版年	2019
卷号	62 期号:4 页码:703-718
英文摘要	Assessment of the suitability of satellite soil moisture products at large scales is urgently needed for numerous climatic and hydrological researches, particularly in arid mountainous watersheds where soil moisture plays a key role in land-atmosphere exchanges. This study presents evaluation of the SMOS (L2) and SMAP (L2_P_E and L2_P) products against ground-based observations from the Upstream of the Heihe River Watershed in situ Soil Moisture Network (UHRWSMN) and the Ecological and Hydrological Wireless Sensor Network (EHWSN) over arid high mountainous watersheds, Northwest China. Results show that all the three products are reliable in catching the temporal trend of the in situ observations at both point and watershed scales in the study area. Due to the uncertainty in brightness temperature and the underestimation of effective temperature, the SMOS L2 product and both the SMAP L2 products show dry bias in the high, cold mountainous area. Because of the more accurate brightness temperature observations viewing at a constant angle and more suitable estimations of single scattering albedo and optical depth, both the SMAP L2 products performed significantly better than the SMOS product. Moreover, comparing with station density of in situ network, station representation is much more important in the evaluation of the satellite soil moisture products. Based on our analysis, we propose the following suggestions for improvement of the SMOS and SMAP product suitability in the mountainous areas: further optimization of effective temperature; revision of the retrieval algorithm of the SMOS mission to reduce the topographic impacts; and, careful selection of in situ observation stations for better representation of in situ network in future evaluations. All these improvements would lead to better applicability of the SMOS and SMAP products for soil moisture estimation to the high elevation and topographically complex mountainous areas in arid regions.
英文关键词	SMOS SMAP Evaluation Different vegetation types Sparse in situ networks Arid mountainous watershed
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000462228900009
WOS关键词	LAND DATA ASSIMILATION ; MICROWAVE EMISSION ; SCATTERING ALBEDO ; CATCHMENT SCALE ; OPTICAL DEPTH ; SWAT MODEL ; VALIDATION ; RETRIEVAL ; MISSION ; OPPORTUNITIES
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218559
作者单位	1.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab West Chinas Environm Syst, Lanzhou 730000, Gansu, Peoples R China; 2.Western Michigan Univ, Dept Geog, Kalamazoo, MI 49008 USA
推荐引用方式 GB/T 7714	Zhang, Lanhui,He, Chansheng,Zhang, Mingmin,et al. Evaluation of the SMOS and SMAP soil moisture products under different vegetation types against two sparse in situ networks over arid mountainous watersheds, Northwest China[J]. 兰州大学,2019,62(4):703-718.
APA	Zhang, Lanhui,He, Chansheng,Zhang, Mingmin,&Zhu, Yi.(2019).Evaluation of the SMOS and SMAP soil moisture products under different vegetation types against two sparse in situ networks over arid mountainous watersheds, Northwest China.SCIENCE CHINA-EARTH SCIENCES,62(4),703-718.
MLA	Zhang, Lanhui,et al."Evaluation of the SMOS and SMAP soil moisture products under different vegetation types against two sparse in situ networks over arid mountainous watersheds, Northwest China".SCIENCE CHINA-EARTH SCIENCES 62.4(2019):703-718.