气候变化领域集成服务门户(CCPortal): Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling

CCPortal

DOI	10.5194/cp-15-1251-2019
	Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling
	Tardif R.; Hakim G.J.; Perkins W.A.; Horlick K.A.; Erb M.P.; Emile-Geay J.; Anderson D.M.; Steig E.J.; Noone D.
发表日期	2019
ISSN	18149324
起始页码	1251
结束页码	1273
卷号	15 期号:4
英文摘要	The Last Millennium Reanalysis (LMR) utilizes an ensemble methodology to assimilate paleoclimate data for the production of annually resolved climate field reconstructions of the Common Era. Two key elements are the focus of this work: the set of assimilated proxy records and the forward models that map climate variables to proxy measurements. Results based on an updated proxy database and seasonal regression-based forward models are compared to the LMR prototype, which was based on a smaller set of proxy records and simpler proxy models formulated as univariate linear regressions against annual temperature. Validation against various instrumental-era gridded analyses shows that the new reconstructions of surface air temperature and 500 hPa geopotential height are significantly improved (from 10 % to more than 100 %), while improvements in reconstruction of the Palmer Drought Severity Index are more modest. Additional experiments designed to isolate the sources of improvement reveal the importance of the updated proxy records, including coral records for improving tropical reconstructions, and tree-ring density records for temperature reconstructions, particularly in high northern latitudes. Proxy forward models that account for seasonal responses, and dependence on both temperature and moisture for tree-ring width, also contribute to improvements in reconstructed thermodynamic and hydroclimate variables in midlatitudes. The variability of temperature at multidecadal to centennial scales is also shown to be sensitive to the set of assimilated proxies, especially to the inclusion of primarily moisture-sensitive tree-ring-width records. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	air temperature; climate modeling; database; geopotential; instrumentation; paleoclimate; proxy climate record; reconstruction; seasonal variation; tree ring; Anthozoa
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146799
作者单位	Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; College of Earth Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Retired, NOAA Paleoclimatology Program, Boulder, CO, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Tardif R.,Hakim G.J.,Perkins W.A.,et al. Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling[J],2019,15(4).
APA	Tardif R..,Hakim G.J..,Perkins W.A..,Horlick K.A..,Erb M.P..,...&Noone D..(2019).Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling.Climate of the Past,15(4).
MLA	Tardif R.,et al."Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling".Climate of the Past 15.4(2019).