气候变化领域集成服务门户(CCPortal): Rapid deglacial and early Holocene expansion of peatlands in Alaska

CCPortal

DOI	10.1073/pnas.0911387107
	Rapid deglacial and early Holocene expansion of peatlands in Alaska
	Jones M.C.; Yu Z.
发表日期	2010
ISSN	0027-8424
起始页码	7347
结束页码	7352
卷号	107 期号:16
英文摘要	Northern peatlands represent one of the largest biospheric carbon (C) reservoirs; however, the role of peatlands in the global carbon cycle remains intensely debated, owing in part to the paucity of detailed regional datasets and the complexity of the role of climate, ecosystem processes, and environmental factors in controlling peatland C dynamics. Here we used detailed C accumulation data from four peatlands and a compilation of peatland initiation ages across Alaska to examine Holocene peatland dynamics and climate sensitivity. We find that 75% of dated peatlands in Alaska initiated before 8,600 years ago and that early Holocene C accumulation rates were four times higher than the rest of the Holocene. Similar rapid peatland expansion occurred in West Siberia during the Holocene thermal maximum (HTM). Our results suggest that high summer temperature and strong seasonality during the HTM in Alaska might have played a major role in causing the highest rates of C accumulation and peatland expansion. The rapid peatland expansion and C accumulation in these vast regions contributed significantly to the peak of atmospheric methane concentrations in the early Holocene. Furthermore, we find that Alaskan peatlands began expanding much earlier than peatlands in other regions, indicating an important contribution of these peatlands to the pre-Holocene increase in atmospheric methane concentrations.
英文关键词	Alaska; Climate seasonality; Holocene thermal maximum; Peatland carbon; Siberia
语种	英语
scopus关键词	carbon; methane; article; biosphere; carbon cycle; climate; climate change; deglaciation; ecosystem; environmental factor; environmental temperature; Holocene; peatland; priority journal; seasonal variation; summer; United States; Alaska; Atmosphere; Carbon; Ecosystem; Geology; Hot Temperature; Methane; Models, Biological; Radiometric Dating; Seasons; Siberia; Soil; Temperature
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159156
作者单位	Jones, M.C., Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, United States; Yu, Z., Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, United States
推荐引用方式 GB/T 7714	Jones M.C.,Yu Z.. Rapid deglacial and early Holocene expansion of peatlands in Alaska[J],2010,107(16).
APA	Jones M.C.,&Yu Z..(2010).Rapid deglacial and early Holocene expansion of peatlands in Alaska.Proceedings of the National Academy of Sciences of the United States of America,107(16).
MLA	Jones M.C.,et al."Rapid deglacial and early Holocene expansion of peatlands in Alaska".Proceedings of the National Academy of Sciences of the United States of America 107.16(2010).