globalchange  > 气候变化与战略
DOI: 10.5194/cp-10-1165-2014
Scopus记录号: 2-s2.0-84902779096
论文题名:
Impact of precession on the climate, vegetation and fire activity in southern Africa during MIS4
作者: Woillez M.-N.; Levavasseur G.; Daniau A.-L.; Kageyama M.; Urrego D.H.; Sánchez-Goñi M.-F.; Hanquiez V.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期:3
起始页码: 1165
结束页码: 1182
语种: 英语
Scopus关键词: biome ; downscaling ; fire behavior ; fire history ; marine isotope stage ; Mediterranean environment ; simulation ; statistical analysis ; Africa
英文摘要: The relationships between climate, vegetation and fires are a major subject of investigation in the context of climate change. In southern Africa, fire is known to play a crucial role in the existence of grasslands and Mediterranean-type biomes. Microcharcoal-based reconstructions of past fire activity in that region have shown a tight correlation between grass-fueled fires and the precessional cycle, with maximum fire activity during maxima of the climatic precession index. These changes have been interpreted as the result of changes in fuel load in response to precipitation changes in eastern southern Africa. Here we use the general circulation model IPSL-CM5A (Institut Pierre Simon Laplace Climate Model version 5A) and the dynamic vegetation model LPJ-LMfire to investigate the response of climate, vegetation and fire activity to precession changes in southern Africa during marine isotopic stage 4 (74-59 kyr BP). We perform two climatic simulations, for a maximum and minimum of the precession index, and use a statistical downscaling method to increase the spatial resolution of the IPSL-CM5A outputs over southern Africa and perform high-resolution simulations of the vegetation and fire activity. Our results show an anticorrelation between the northern and southern African monsoons in response to precession changes. A decrease of the precession climatic index leads to a precipitation decrease in the summer rainfall area of southern Africa. The drying of climate leads to a decrease of vegetation cover and fire activity. Our results are in qualitative agreement with data and confirm that fire activity in southern Africa during MIS4 is mainly driven by vegetation cover. © 2014 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49256
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Recommended Citation:
Woillez M.-N.,Levavasseur G.,Daniau A.-L.,et al. Impact of precession on the climate, vegetation and fire activity in southern Africa during MIS4[J]. Climate of the Past,2014-01-01,10(3)
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