干旱区生态环境知识资源中心(Arid): A Triple Collocation-Based Comparison of Three L-Band Soil Moisture Datasets, SMAP, SMOS-IC, and SMOS, Over Varied Climates and Land Covers

Arid

DOI	10.3389/frwa.2021.693172
	A Triple Collocation-Based Comparison of Three L-Band Soil Moisture Datasets, SMAP, SMOS-IC, and SMOS, Over Varied Climates and Land Covers
	Kim, Seokhyeon; Dong, Jianzhi; Sharma, Ashish
通讯作者	Kim, S (corresponding author), Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia.
来源期刊	FRONTIERS IN WATER
EISSN	2624-9375
出版年	2021
卷号	3
英文摘要	Soil moisture plays an important role in the hydrologic water cycle. Relative to in-situ soil moisture measurements, remote sensing has been the only means of monitoring global scale soil moisture in near real-time over the past 40 years. Among these, soil moisture products from radiometry sensors operating at L-band, e.g., SMAP, SMOS, and SMOS-IC, are theoretically established to be more advantageous than previous C/X-band products. However, little effort has been made to investigate the inter-product differences of L-band soil moisture retrievals and provide insights into the optimal use of these products. In this regard, this study aims to identify the relative strengths and weaknesses of three L-band soil moisture products across diverse climate zones and land covers at the global scale using triple collocation analysis. Results show that SMOS-IC exhibits significantly improved soil moisture estimation skills, relative to the original SMOS product. This demonstrates the paramount importance of retrieval algorithm development in improving global soil moisture estimates-given both SMOS-IC and SMOS are using the same L-band brightness temperature information. Relative to SMOS-IC, SMAP is superior across 69% of global land surface in terms of error variances. However, SMOS-IC tends to outperform SMAP over temperate/arid regions including in the east of North America, South America, western Africa, northern China, and central Australia. Additionally, considerable performance degradation of all the L-band data products is observed over unvegetated areas. This may suggest that improving soil moisture retrieval accuracy over arid and semi-arid regions should be a key priority for future L-band soil moisture development, and model-based (e.g., GLDAS) soil moisture products appear to provide more accurate soil moisture estimates over these regions.
英文关键词	soil moisture L-band triple collocation SMAP SMOS SMOS-IC
类型	Article
语种	英语
开放获取类型	gold
收录类别	ESCI
WOS记录号	WOS:000674321400001
WOS关键词	MICROWAVE EMISSION ; DATA SETS ; SATELLITE ; MODEL ; RETRIEVAL ; COMBINATION ; TEMPERATURE ; CALIBRATION ; VALIDATION ; RADIOMETER
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363358
作者单位	[Kim, Seokhyeon; Sharma, Ashish] Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia; [Dong, Jianzhi] MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA
推荐引用方式 GB/T 7714	Kim, Seokhyeon,Dong, Jianzhi,Sharma, Ashish. A Triple Collocation-Based Comparison of Three L-Band Soil Moisture Datasets, SMAP, SMOS-IC, and SMOS, Over Varied Climates and Land Covers[J],2021,3.
APA	Kim, Seokhyeon,Dong, Jianzhi,&Sharma, Ashish.(2021).A Triple Collocation-Based Comparison of Three L-Band Soil Moisture Datasets, SMAP, SMOS-IC, and SMOS, Over Varied Climates and Land Covers.FRONTIERS IN WATER,3.
MLA	Kim, Seokhyeon,et al."A Triple Collocation-Based Comparison of Three L-Band Soil Moisture Datasets, SMAP, SMOS-IC, and SMOS, Over Varied Climates and Land Covers".FRONTIERS IN WATER 3(2021).