Regional trends in terrestrial carbon exchange and their seasonal signatures

被引:28
作者
Gurney, Kevin R. [1 ]
Eckels, Warren J. [2 ]
机构
[1] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
[2] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47906 USA
来源
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY | 2011年 / 63卷 / 03期
关键词
ATMOSPHERIC CO2 GROWTH; FORESTS GREEN-UP; SATELLITE-OBSERVATIONS; CYCLE FEEDBACKS; LAND-USE; CLIMATE; SINKS; EMISSIONS; VARIABILITY; NORTHERN;
D O I
10.1111/j.1600-0889.2011.00534.x
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The trends of terrestrial carbon exchange and their mechanistic drivers are key components in understanding how carbon reservoirs will respond to climate change. Here we show trends in seasonal non-fossil land-atmosphere carbon exchange from 1980 to 2008 using atmospheric CO2 inversion results. Four indices were analysed: growing-season net flux (GSNF), dormant-season net flux (DSNF), amplitude and annual net carbon flux (NCF). We find that the global land carbon sink is intensifying at -0.057 +/- 0.01 PgC yr(-2), resulting in -1.65 +/- 0.29 PgC of additional uptake over the period examined. This increased total land uptake is driven by a decline in the DSNF (-0.04 +/- 0.01 PgC yr(-2)) and intensification of the GSNF (-0.02 +/- 0.008 PgC yr(-2)). Regional analysis shows the dominant role of the southern half of the African continent; intensification of the GSNF (-0.02 +/- 0.005 PgC yr(-2)) and a decline in the DSNF (-0.013 +/- 0.004 PgC yr(-2)) imply that Africa has shifted from a net carbon source in the 1980s to near-neutral emissions. By contrast, a weakening of the GSNF is found in temperate North America (0.015 +/- 0.007 PgC yr(-2)) and tropical America (0.01 +/- 0.005 PgC yr(-2)).
引用
收藏
页码:328 / 339
页数:12
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