干旱区生态环境知识资源中心(Arid): Potential Reemergence of Seasonal Soil Moisture Anomalies in North America

Arid

DOI	10.1175/JCLI-D-18-0540.1
	Potential Reemergence of Seasonal Soil Moisture Anomalies in North America
	Kumar, Sanjiv 1; Newman, Matthew 2,3; Wang, Yan 2,3; Livneh, Ben 2,4
通讯作者	Kumar, Sanjiv
来源期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
EISSN	1520-0442
出版年	2019
卷号	32 期号:10 页码:2707-2734
英文摘要	Soil moisture anomalies within the root zone (roughly, soil depths down to similar to 0.4 m) typically persist only a few months. Consequently, land surface-related climate predictability research has often focused on subseasonal to seasonal time scales. However, in this study of multidecadal in situ datasets and land data assimilation products, we find that root zone soil moisture anomalies can recur several or more seasons after they were initiated, indicating potential interannual predictability. Lead-lag correlations show that this recurrence often happens during one fixed season and also seems related to the greater memory of soil moisture anomalies within the layer beneath the root zone, with memory on the order of several months to over a year. That is, in some seasons, notably spring and summer when the vertical soil water potential gradient reverses sign throughout much of North America, deeper soil moisture anomalies appear to return to the surface, thereby restoring an earlier root zone anomaly that had decayed. We call this process reemergence, in analogy with a similar seasonally varying process (with different underlying physics) providing winter-to-winter memory to the extratropical ocean surface layer. Pronounced spatial and seasonal dependence of soil moisture reemergence is found that is frequently, but not always, robust across datasets. Also, some of its aspects appear sensitive to spatial and temporal sampling, especially within the shorter available in situ datasets, and to precipitation variability. Like its namesake, soil moisture reemergence may enhance interannual-to-decadal variability, notably of droughts. Its detailed physics and role within the climate system, however, remain to be understood.
英文关键词	Land surface model Climate variability Interannual variability Seasonal variability
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000465567600003
WOS关键词	COMMUNITY LAND MODEL ; LONG-TERM DROUGHT ; HYDRAULIC REDISTRIBUTION ; HISTORICAL SIMULATIONS ; CLIMATE MODELS ; DESERT SOILS ; PART I ; WATER ; VARIABILITY ; SURFACE
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216878
作者单位	1.Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA; 2.Univ Colorado Boulder, Cooperat Inst Res Environm Sci, Boulder, CO USA; 3.NOAA, Div Phys Sci, Earth Syst Res Lab, Boulder, CO USA; 4.Univ Colorado Boulder, Dept Civil Environm & Architectural Engn, Boulder, CO USA
推荐引用方式 GB/T 7714	Kumar, Sanjiv,Newman, Matthew,Wang, Yan,et al. Potential Reemergence of Seasonal Soil Moisture Anomalies in North America[J],2019,32(10):2707-2734.
APA	Kumar, Sanjiv,Newman, Matthew,Wang, Yan,&Livneh, Ben.(2019).Potential Reemergence of Seasonal Soil Moisture Anomalies in North America.JOURNAL OF CLIMATE,32(10),2707-2734.
MLA	Kumar, Sanjiv,et al."Potential Reemergence of Seasonal Soil Moisture Anomalies in North America".JOURNAL OF CLIMATE 32.10(2019):2707-2734.