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Browning in Desert Boundaries in Asia in Recent DecadesIn this study, the changes in desert boundaries in Asia (Gobi, Karakum, Lut, Taklimakan, and Thar deserts) during the growing season (April October) in the years 1982 2008 were investigated by analyzing the normalized difference vegetation index (NDVI), precipitation, and temperature. In the desert boundary regions, the domain mean NDVI values increased by 7.2% per decade in 1982 1998 but decreased by 6.8% per decade thereafter. Accordingly, the bare soil areas (or nonvegetated areas) of the inside of the desert boundaries contracted by 9.8% per decade in the 1990s and expanded by 8.7% per decade in the 2000s. It is noted that the five deserts experience nearly simultaneous NDVI changes although they cover a very diverse area of Asia. In contrast, changes in temperature and precipitation in the deserts show rather diverse results. In desert boundaries located along 40 N (Gobi, Taklimakan, and Karakum), the decadal changes in vegetation greenness were mainly related to regional climate during the entire analysis period. Precipitation increased in the 1990s, providing favorable conditions for vegetation growth (i.e., greening), but precipitation reduced (19 mm per decade) and warming intensified (0.7 C per decade) in the 2000s, causing less moisture to be available for vegetation growth (i.e., browning). In desert boundaries below 40 N (Lut and Thar), although an increase in precipitation (8 mm per decade) led to greening in the 1990s, local changes in precipitation and temperature did not necessarily cause browning in the 2000s. Observed multidecadal changes in vegetation greenness in the present study suggest that under significant global and/or regional warming, changes in moisture availability for vegetation growth in desert boundaries are an important factor when understanding decadal changes in areas vulnerable to desertification over Asia.
Document ID
20110015504
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jeong, Su-Jong
(Seoul National Univ. Korea, Republic of)
Ho, Chang-Hoi
(Seoul National Univ. Korea, Republic of)
Brown, Molly E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kug, Jong-Seong
(Korea Ocean Research and Development Inst. Seoul, Korea, Republic of)
Piao, Shilong
(Peking Univ. Beijing, China)
Date Acquired
August 25, 2013
Publication Date
January 20, 2011
Publication Information
Publication: Journal of Geophysical Research - Atmospheres
Publisher: American Geophysical Union
Volume: 116
ISSN: 0148-0227
Subject Category
Geophysics
Report/Patent Number
GSFC.JA.4994.2011
Funding Number(s)
CONTRACT_GRANT: CATER 2006-4204
Distribution Limits
Public
Copyright
Other

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