干旱区生态环境知识资源中心(Arid): Exploring SMAP and OCO-2 observations to monitor soil moisture control on photosynthetic activity of global drylands and croplands

Arid

DOI	10.1016/j.rse.2019.111314
	Exploring SMAP and OCO-2 observations to monitor soil moisture control on photosynthetic activity of global drylands and croplands
	Gonsamo, Alemu 1,2; Chen, Jing M.1; He, Liming 1,3; Sun, Ying 4; Rogers, Cheryl 1; Liu, Jane 1
通讯作者	Gonsamo, Alemu
来源期刊	REMOTE SENSING OF ENVIRONMENT
ISSN	0034-4257
EISSN	1879-0704
出版年	2019
卷号	232
英文摘要	Sun-induced chlorophyll fluorescence (SIF) has proven valuable as a proxy of terrestrial ecosystem photosynthesis that can be used to study the impact of environmental limiting factors on terrestrial ecosystem productivity. In global drylands and croplands, soil moisture is often a primary limiting factor to plant growth. Here we use the SIF retrievals from the Orbiting Carbon Observatory-2 (OCO-2) and soil moisture (SM) retrievals from the Soil Moisture Active Passive (SMAP) satellites to study the soil moisture control on photosynthetic activity of global drylands and croplands. We primarily analyze the predawn SM control on daily peak photosynthetic activity using the morning SM observations from SMAP and the noon SIF observations from OCO-2. On global drylands (i.e., dry sub-humid, semi-arid, and arid zones) and majority of croplands, soil water content is typically low, moisture in the topsoil is critical for plant growth, and satellite-based SIF and SM observations are expected to have high retrieval accuracy. The SMAP SM retrievals show positive daily relationships with OCO-2 SIF for drylands and croplands of the tropics and Australia, where SM is expected to limit plant growth and concurrent data records are sufficient to make statistical inferences. Negative relationships between SIF and SM were observed in forested areas of mid-latitude dry subhumid zones with high average annual SM for which SIF showed a positive relationship with air temperature. The relationships between SM and SIF follow the expected spatial patterns, positive and stronger in drier and warmer regions whereas weaker and often negative in colder and wetter regions. We find strong evidence that the OCO-2 SIF is accurately capturing monthly SMAP SM dynamics particularly for regions with distinct seasonality of rainfall such as the Sub-Saharan North Africa, Indian subcontinent, and South African countries. These results indicate new opportunities for monitoring dryland and cropland productivity solely using satellite observed SIF and soil moisture data.
英文关键词	Dryland Crop monitoring SMAP Chlorophyll fluorescence Soil moisture OCO-2 SIF
类型	Article
语种	英语
国家	Canada ; USA
收录类别	SCI-E
WOS记录号	WOS:000486355300029
WOS关键词	INDUCED CHLOROPHYLL FLUORESCENCE ; SUN-INDUCED FLUORESCENCE ; SPATIOTEMPORAL PATTERNS ; DROUGHT ; EARTH ; VALIDATION ; RETRIEVAL ; DESERTIFICATION ; MECHANISMS ; SURFACE
WOS类目	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218431
作者单位	1.Univ Toronto, Dept Geog & Planning, Toronto, ON M5S 3G3, Canada; 2.McMaster Univ, Sch Geog & Earth Sci, Hamilton, ON L8S 4L8, Canada; 3.Lab Environm Model & Data Optima EMDO, Laurel, MD USA; 4.Cornell Univ, Soil & Crop Sci Sect, Sch Integrat Plant Sci, Ithaca, NY USA
推荐引用方式 GB/T 7714	Gonsamo, Alemu,Chen, Jing M.,He, Liming,et al. Exploring SMAP and OCO-2 observations to monitor soil moisture control on photosynthetic activity of global drylands and croplands[J],2019,232.
APA	Gonsamo, Alemu,Chen, Jing M.,He, Liming,Sun, Ying,Rogers, Cheryl,&Liu, Jane.(2019).Exploring SMAP and OCO-2 observations to monitor soil moisture control on photosynthetic activity of global drylands and croplands.REMOTE SENSING OF ENVIRONMENT,232.
MLA	Gonsamo, Alemu,et al."Exploring SMAP and OCO-2 observations to monitor soil moisture control on photosynthetic activity of global drylands and croplands".REMOTE SENSING OF ENVIRONMENT 232(2019).