Fire regimes during the Last Glacial
Fire regimes during the Last Glacial
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DOI：
10.1016/j.quascirev.2009.11.008
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发表时间：
2010-10-01
影响因子：
4
通讯作者：
Bartlein, P. J.
中科院分区：
文献类型：
--
作者：
Daniau, A. -L.;Harrison, S. P.;Bartlein, P. J.
沉积木炭记录记录了火情的变化。我们已经确定了67个地点(30个地点的分辨率高于千禧年)，这些地点记录了最后一次冰川的某些部分，以分析全球火灾制度的变化。冰川时期的火势一直低于伊米亚和全新世。在冰川时期，海洋同位素阶段(MIS3)的全球火势比MIS2多。MIS4的信号不太清楚：与MIS2和MIS3相比，北半球的火情更多，南半球的火情更少。记录，尤其是来自北部温带地区的记录，显示了与Dansgaard-Oeschger(D-O)循环相关的快速气候变化所对应的火情的千年尺度变化。末次冰期和所有海因里希体育场的大部分D-O循环在全球火灾状况的综合记录中都很明显：在D-O变暖事件期间火灾增加，在快速冷却期间减少。我们的分析表明，在D-O变暖事件中，火场对快速气候变化的响应约为100-200年，在D-O冷却事件中，约为0-100年，在Heinrich Stadials事件中，约为200年。尽管生物质燃烧的基本水平比今天低，但冰川时期经历的强烈气候变化导致了火灾制度的重要变化。(C)2009爱思唯尔有限公司。保留所有权利。
Sedimentary charcoal records document changes in fire regime. We have identified 67 sites (30 sites with better than millennial resolution) which have records for some part of the Last Glacial to analyse changes in global fire regimes. Fire was consistently lower during the glacial than during the Eemian and Holocene. Within the glacial, Marine Isotope Stage (MIS) 3 is characterised globally by more fire than MIS 2. The signal for MIS 4 is less clear: there is more fire in the Northern Hemisphere and less fire in the Southern Hemisphere than during MIS 2 and 3. The records, most particularly records from the northern extratropics, show millennial-scale variability in fire regimes corresponding to the rapid climate changes associated with Dansgaard-Oeschger (D-O) cycles. Most of the D-O cycles during the Last Glacial and all of the Heinrich stadials are apparent in the composite global record of fire regime: fire increases during D-O warming events and decreases during intervals of rapid cooling. Our analyses show that fire regimes show a lagged response to rapid climate changes of ca 100-200 years in the case of D-O warming events, ca 0-100 years in the case of D-O cooling events and ca 200 years in the case of Heinrich Stadials. The Strong climatic variability experienced during the glacial resulted in important changes in fire regimes even though the base level of biomass burning was less than today. (C) 2009 Elsevier Ltd. All rights reserved.