globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.005
Scopus记录号: 2-s2.0-85020841481
论文题名:
Ocean-atmosphere dynamics linked to 800–1050 CE drying in mesoamerica
作者: Bhattacharya T.; Chiang J.C.H.; Cheng W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 169
起始页码: 263
结束页码: 277
语种: 英语
英文关键词: Central America ; Climate dynamics ; Drought ; Holocene ; Paleoclimatology ; Proxy-model synthesis
Scopus关键词: Climate models ; Digital storage ; Dynamics ; Oceanography ; Central America ; Climate dynamics ; Holocenes ; Paleoclimatology ; Proxy model ; Drought ; atmosphere-ocean system ; Bayesian analysis ; climate variation ; drought ; general circulation model ; Holocene ; paleoclimate ; proxy climate record ; Atlantic Ocean ; Atlantic Ocean (North) ; Central America ; Mexico [North America]
英文摘要: Proxy records from the last millennium in Mesoamerica suggest a widespread interval of drought at some point between the 7th and 13th centuries CE. In some records, this time period represents the driest proxy values in the last few millennia. There is currently no clear dynamical explanation for these droughts, nor consensus as to whether they were spatiotemporally coherent over the region. We perform several analyses to develop a novel hypothesis to explain these droughts that is consistent with our knowledge of the dynamics of the climate system. We use Bayesian age modeling techniques and a synthesis of regional proxy records to suggest that there is robust evidence of drying between 800 and 1050 CE, with the sites showing dry conditions clustered in southern central America. By studying control simulations of two general circulation models (GCMs), we suggest that this pattern may be diagnostic of hydroclimate changes associated with multidecadal variability in the Atlantic Basin. Models and instrumental data suggest that cooling of tropical Atlantic SSTs and strengthening of the North Atlantic Subtropical High drives a pattern of multidecadal drought with negative rainfall anomalies in southern central America and positive anomalies in northern Mexico. This process could have resulted in the droughts observed in the proxy record. Our work offers a novel hypothesis about the dynamics of multidecadal drought in Mesoamerica, and builds on previous efforts to synthesize proxy records from the region. © 2017 Elsevier Ltd
资助项目: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE 1106400. Additional funding comes from NSF DDRIG No. BCS-13333370, and a U.C. Museum of Paleontology Graduate Research Award (2013–2014, 2014–2015) and NOAA grants NA16OAR4310171 to J.C.H. Chiang and NA16OAR4310169 to W. Cheng. We thank Jeff Knight for help with HadCM3 output. We thank current and past members of the U.C. Berkeley Climate ‘Supergroup,’ David Wahl, Roger Byrne, Ben Cook, and others for helpful suggestions and discussions.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59168
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作者单位: Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Geography, University of California Berkeley, Berkeley, CA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States

Recommended Citation:
Bhattacharya T.,Chiang J.C.H.,Cheng W.. Ocean-atmosphere dynamics linked to 800–1050 CE drying in mesoamerica[J]. Quaternary Science Reviews,2017-01-01,169
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