气候变化领域集成服务门户(CCPortal): The North American hydrologic cycle through the last deglaciation

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DOI	10.1016/j.quascirev.2019.105991
	The North American hydrologic cycle through the last deglaciation
	Lora J.M.; Ibarra D.E.
发表日期	2019
ISSN	0277-3791
卷号	226
英文摘要	While the climate evolution of North America during the last deglaciation has received considerable attention, few detailed model–data comparisons of the deglacial hydroclimate have been conducted at the continental scale. Here we use a transient climate simulation of the last deglaciation and a synthesis of hydroclimate proxies from across the continent to broadly assess the moisture budget and its evolution, including the primary components and mechanisms for changes, and evaluate the level of agreement between model and data in order to inform areas of major discrepancy for attention in future work. At the broadest scale, the simulation indicates that North America was wetter than modern through much of the last deglaciation, with the exception of the Pacific Northwest. This was principally due to increased moisture convergence by the mean flow over the west of the continent, and by transient eddies over the east. We find that the simulation demonstrates considerable skill in comparison to proxy records in the coastal Southwest and Pacific Northwest, with limited success in other regions. The highest disagreement occurs in the North-central region, where the model and data disagree on the sign of changes. In addition, we find that the areas of agreement coincide with regions whose hydroclimate is dominated by winter precipitation, while regions of disagreement are those where summer precipitation is predominant, and where the model suggests dynamical changes are important. These results illustrate the impact of the ice sheet on the atmospheric dynamics, and therefore the importance of its accurate reconstruction, as well as that of model resolution. Our analysis and synthesis provide context for future transient climate simulations, and suggest numerous areas of priority for future research. © 2019 Elsevier Ltd
英文关键词	Climate dynamics; Deglaciation; Hydroclimate; Lagoons & swamps; Lakes; North America; Paleoclimate modeling; Paleoclimate records; Pleistocene; Sedimentology; Speleothems
语种	英语
scopus关键词	Budget control; Lakes; Moisture; Sedimentology; Climate dynamics; Deglaciations; Hydroclimate; North America; Paleoclimate records; Paleoclimates; Pleistocene; Speleothems; Climate models; atmospheric dynamics; climate change; coastal lagoon; comparative study; deglaciation; eddy covariance; historical record; hydrological cycle; hydrometeorology; ice sheet; lake; last deglaciation; moisture transfer; paleoclimate; Pleistocene; precipitation (climatology); proxy climate record; reconstruction; sedimentology; simulation; speleothem; swamp; Pacific Northwest
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151666
作者单位	Department of Geology and Geophysics, Yale University, New Haven, CT 06520, United States; Department of Geological Sciences, Stanford University, Stanford, CA 94305, United States; Present Address: Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Lora J.M.,Ibarra D.E.. The North American hydrologic cycle through the last deglaciation[J],2019,226.
APA	Lora J.M.,&Ibarra D.E..(2019).The North American hydrologic cycle through the last deglaciation.Quaternary Science Reviews,226.
MLA	Lora J.M.,et al."The North American hydrologic cycle through the last deglaciation".Quaternary Science Reviews 226(2019).