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Title: Changes in global vegetation activity and its driving factors during 1982–2013

Journal Article · · Agricultural and Forest Meteorology
 [1];  [2];  [2]
  1. Wuhan University (China)
  2. State University of New York (SUNY), Albany, NY (United States)

Vegetation activity plays a crucial role in the global carbon cycle and climate. Many studies have examined recent changes in vegetation growth and the associated local climatic drivers. They revealed a global greening trend during the recent decades. However, few studies have analyzed how remote oceanic conditions affect land vegetation growth through atmospheric teleconnection, and the causes of the recent greening needs further investigation. Here in this study, we investigate the spatio-temporal variations (including trends) of vegetation activity using satellite data of growing-season normalized difference vegetation index (NDVIgs), and examine their relationship to local and remote climate oscillations and external anthropogenic forcing by statistical means. As expected, there is an increasing trend in global-mean NDVIgs from 1982–2013, with significant greening over Europe and many other land areas. NDVIgs is temperature-limited at northern high-latitudes, but water-limited in arid and semi-arid regions, and radiation-limited in the Amazon and eastern and southern Asia. Globally, El Niño-Southern Oscillation (ENSO) is the leading climatic driver of interannual variability of NDVIgs, especially over southern and eastern Africa, eastern Australia, northeastern Asia, and northern South America. Consistent with previous modeling studies, a regression-based attribution analysis suggests that historical anthropogenic forcing (mainly increases in greenhouse gases) explains about two thirds of the NDVIgs trend from 1982 to 2013, with the rest coming mainly from the Atlantic Multi-decadal Oscillation (AMO). Contributions to the recent NDVIgs trend from ENSO and Pacific decadal variability and Artctic Oscillation appear to be small.

Research Organization:
State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); National Oceanic and Atmospheric Administration (NOAA); National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation
Grant/Contract Number:
SC0012602; AGS-1353740; NA15OAR4310086; 41301586; 2014T70731
OSTI ID:
1537935
Alternate ID(s):
OSTI ID: 1549161
Journal Information:
Agricultural and Forest Meteorology, Vol. 249, Issue C; ISSN 0168-1923
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 132 works
Citation information provided by
Web of Science

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