DOI: 10.5194/cp-8-37-2012
Scopus记录号: 2-s2.0-84860259549
论文题名: Tropical climate and vegetation changes during Heinrich Event 1: A model-data comparison
作者: Handiani D. ; Paul A. ; Dupont L.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 1 起始页码: 37
结束页码: 57
语种: 英语
Scopus关键词: biome
; climate effect
; climate modeling
; data acquisition
; glacial environment
; land surface
; Last Glacial Maximum
; latitude
; Northern Hemisphere
; palynology
; simulation
; tropical environment
; vegetation structure
; Atlantic Ocean
; South America
英文摘要: Abrupt climate changes from 18 to 15 thousand years before present (kyr BP) associated with Heinrich Event 1 (HE1) had a strong impact on vegetation patterns not only at high latitudes of the Northern Hemisphere, but also in the tropical regions around the Atlantic Ocean. To gain a better understanding of the linkage between high and low latitudes, we used the University of Victoria (UVic) Earth System-Climate Model (ESCM) with dynamical vegetation and land surface components to simulate four scenarios of climate-vegetation interaction: the pre-industrial era, the Last Glacial Maximum (LGM), and a Heinrich-like event with two different climate backgrounds (interglacial and glacial). We calculated mega-biomes from the plant-functional types (PFTs) generated by the model to allow for a direct comparison between model results and palynological vegetation reconstructions. Our calculated mega-biomes for the pre-industrial period and the LGM corresponded well with biome reconstructions of the modern and LGM time slices, respectively, except that our pre-industrial simulation predicted the dominance of grassland in southern Europe and our LGM simulation resulted in more forest cover in tropical and sub-tropical South America. The HE1-like simulation with a glacial climate background produced sea-surface temperature patterns and enhanced inter-hemispheric thermal gradients in accordance with the "bipolar seesaw" hypothesis. We found that the cooling of the Northern Hemisphere caused a southward shift of those PFTs that are indicative of an increased desertification and a retreat of broadleaf forests in West Africa and northern South America. The mega-biomes from our HE1 simulation agreed well with paleovegetation data from tropical Africa and northern South America. Thus, according to our model-data comparison, the reconstructed vegetation changes for the tropical regions around the Atlantic Ocean were physically consistent with the remote effects of a Heinrich event under a glacial climate background. © 2009 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49545
Appears in Collections: 气候变化与战略
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Recommended Citation:
Handiani D.,Paul A.,Dupont L.. Tropical climate and vegetation changes during Heinrich Event 1: A model-data comparison[J]. Climate of the Past,2012-01-01,8(1)