Reduced carbon uptake during the 2010 Northern Hemisphere summer from GOSAT
Reduced carbon uptake during the 2010 Northern Hemisphere summer from GOSAT
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DOI：
10.1002/grl.50402
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发表时间：
2013-05-28
影响因子：
5.2
通讯作者：
Aben, I.
中科院分区：
文献类型：
--
作者：
Guerlet, S.;Basu, S.;Aben, I.
温室气体观测卫星（GOSAT）测量的CO2柱平均干空气摩尔分数（XCO 2）揭示了2009 - 2010年北方半球夏季CO2吸收的显著年际变化（IAV）。2010年北美和欧亚大陆的XCO（2）下降比2009年分别浅2.4ppm和3.0ppm。2010年夏季碳吸收的减少很可能是由于欧亚大陆的热浪推动了生物圈通量和火灾排放。GOSAT和地面数据的联合反演估计综合生物圈和火排放异常在4月至9月的0.89 - 0.20 PgC欧亚大陆。相比之下，仅反演地面观测值不能复制观测到的XCO（2）IAV，并低估了欧亚大陆的发射IAV。这表明GOSAT XCO（2）在限制陆地-大气CO2交换对气候事件的响应方面的价值。
Column-averaged dry air mole fractions of carbon dioxide (XCO2) measured by the Greenhouse Gases Observing Satellite (GOSAT) reveal significant interannual variation (IAV) of CO(2)uptake during the Northern Hemisphere summer between 2009 and 2010. The XCO(2)drawdown in 2010 is shallower than in 2009 by 2.4ppm and 3.0ppm over North America and Eurasia, respectively. Reduced carbon uptake in the summer of 2010 is most likely due to the heat wave in Eurasia driving biospheric fluxes and fire emissions. A joint inversion of GOSAT and surface data estimates an integrated biospheric and fire emission anomaly in April-September of 0.89 0.20 PgC over Eurasia. In contrast, inversions of surface measurements alone fail to replicate the observed XCO(2)IAV and underestimate emission IAV over Eurasia. This shows the value of GOSAT XCO(2)in constraining the response of land-atmosphere exchange of CO2 to climate events.