北方森林火灾对气候变暖的影响。

The impact of boreal forest fire on climate warming.

作者信息

Randerson J T, Liu H, Flanner M G, Chambers S D, Jin Y, Hess P G, Pfister G, Mack M C, Treseder K K, Welp L R, Chapin F S, Harden J W, Goulden M L, Lyons E, Neff J C, Schuur E A G, Zender C S

机构信息

Department of Earth System Science, University of California, Irvine, CA 92697, USA.

出版信息

Science. 2006 Nov 17;314(5802):1130-2. doi: 10.1126/science.1132075.

DOI:10.1126/science.1132075

PMID:17110574

Abstract

We report measurements and analysis of a boreal forest fire, integrating the effects of greenhouse gases, aerosols, black carbon deposition on snow and sea ice, and postfire changes in surface albedo. The net effect of all agents was to increase radiative forcing during the first year (34 +/- 31 Watts per square meter of burned area), but to decrease radiative forcing when averaged over an 80-year fire cycle (-2.3 +/- 2.2 Watts per square meter) because multidecadal increases in surface albedo had a larger impact than fire-emitted greenhouse gases. This result implies that future increases in boreal fire may not accelerate climate warming.

摘要

我们报告了对一场北方森林火灾的测量与分析，综合考量了温室气体、气溶胶、黑碳在雪和海冰上的沉积，以及火灾后地表反照率的变化所产生的影响。所有因素的净效应在火灾发生后的第一年增加了辐射强迫（每平方米燃烧面积为34±31瓦），但在80年的火灾周期内平均计算时则降低了辐射强迫（每平方米-2.3±2.2瓦），这是因为地表反照率数十年的增加所产生的影响比火灾排放的温室气体更大。这一结果表明，未来北方火灾的增加可能不会加速气候变暖。