Increased plant growth in the northern high latitudes from 1981 to 1991
Increased plant growth in the northern high latitudes from 1981 to 1991
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DOI：
10.1038/386698a0
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发表时间：
1997-04-17
期刊：
影响因子：
64.8
通讯作者：
Nemani, RR
中科院分区：
文献类型：
--
作者：
Myneni, RB;Keeling, CD;Nemani, RR
大气CO2季节性循环的幅度和时间变化与地面空气温度的关系与以下假设一致：在北方高纬度地区，较高的温度促进了夏季植物生长（1）和/或冬季植物呼吸（2）。在这里，我们提出的证据，从卫星数据表明，陆地植被的光合活性增加，从1981年至1991年的方式，这是暗示植物生长与延长的活跃生长季节的增加。增幅最大的地区位于北纬45度至70度之间，由于雪提前消失（4），春季（3）出现了明显变暖。卫星数据与自20世纪70年代初以来大气二氧化碳季节性循环幅度超过20%的增加以及春季和初夏CO2下降时间的提前长达7天一致（1）。因此，卫星数据和CO2记录都表明，全球碳循环对地表气温的年际波动作出了反应，这种波动虽然在全球范围内很小，但在区域范围内非常重要。
Variations in the amplitude and timing of the seasonal cycle of atmospheric CO2 have shown an association with surface air temperature consistent with the hypothesis that warmer temperatures have promoted increases in plant growth during summer(1) and/or plant respiration during winter(2) in the northern high latitudes. Here we present evidence from satellite data that the photosynthetic activity of terrestrial vegetation increased from 1981 to 1991 in a manner that is suggestive of an increase in plant growth associated with a lengthening of the active growing season. The regions exhibiting the greatest increase lie between 45 degrees N and 70 degrees N, where marked warming has occurred in the spring time(3) due to an early disappearance of snow(4). The satellite data are concordant with an increase in the amplitude of the seasonal cycle of atmospheric carbon dioxide exceeding 20% since the early 1970s, and an advance of up to seven days in the timing of the drawdown of CO2 in spring and early summer(1). Thus, both the satellite data and the CO2 record indicate that the global carbon cycle has responded to interannual fluctuations in surface air temperature which, although small at the global scale, are regionally highly significant.