期刊
NATURE GEOSCIENCE
卷 5, 期 8, 页码 551-556出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NGEO1529
关键词
-
资金
- US National Science Foundation [ATM-0910766, F1137306/MIT, 5710003122]
- NASA Terrestrial Ecology award [NNX10AR68G (2N041)]
- AmeriFlux (the Office of Science (BER), US Department of Energy [DE-FG02-04ER63917, DE-FG02-04ER63911]
- Direct For Biological Sciences
- Emerging Frontiers [1137306] Funding Source: National Science Foundation
Fossil fuel emissions aside, temperate North America is a net sink of carbon dioxide at present(1-3). Year-to-year variations in this carbon sink are linked to variations in hydroclimate that affect net ecosystem productivity(3,4). The severity and incidence of climatic extremes, including drought, have increased as a result of climate warming(5-8). Here, we examine the effect of the turn of the century drought in western North America on carbon uptake in the region, using reanalysis data, remote sensing observations and data from global monitoring networks. We show that the area-integrated strength of the western North American carbon sink declined by 30-298 Tg C yr(-1) during the 2000-2004 drought. We further document a pronounced drying of the terrestrial biosphere during this period, together with a reduction in river discharge and a loss of cropland productivity. We compare our findings with previous palaeoclimate reconstructions(7) and show that the last drought of this magnitude occurred more than 800 years ago. Based on projected changes in precipitation and drought severity, we estimate that the present mid-latitude carbon sink of 177-623 Tg C yr(-1) in western North America could disappear by the end of the century.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据