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DOI | 10.1038/s41561-018-0220-7 |
Ice-sheet modulation of deglacial North American monsoon intensification | |
Bhattacharya, Tripti1,2; Tierney, Jessica E.1; Addison, Jason A.3; Murray, James W.4 | |
2018-11-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:11页码:848-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The North American monsoon, the dominant source of rainfall for much of the arid US Southwest, remains one of the least understood monsoon systems. The late Pleistocene evolution of this monsoon is poorly constrained, largely because glacial changes in winter rainfall obscure summer monsoon signatures in many regional proxy records. Here, we develop deglacial records of monsoon strength from isotopic analyses of leaf wax biomarkers in marine sediment cores. Reconstructions indicate a regional decrease in monsoon rainfall during the Last Glacial Maximum, and that the deglacial trajectory of the North American monsoon closely tracks changes in North American ice cover. In climate model simulations, North American ice cover shifts the westerlies southwards, favouring the mixing of cold, dry air into the US Southwest. This process, known as ventilation, weakens the monsoon by diluting the energy fluxes required for convection. As the ice sheet retreats northwards, the monsoon strengthens, and local ocean conditions may play a larger role in regulating its intensity. We conclude that on glacial-interglacial timescales, ice-sheet-induced reorganizations of atmospheric circulation have a dominant influence on the North American monsoon. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448672100011 |
WOS关键词 | GULF-OF-CALIFORNIA ; SOUTHWESTERN UNITED-STATES ; ISOTOPIC COMPOSITION ; REGIONAL REANALYSIS ; TIBETAN PLATEAU ; AFRICAN MONSOON ; ATLANTIC OCEAN ; SOIL-MOISTURE ; CLIMATE ; PRECIPITATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34700 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 2.Syracuse Univ, Dept Earth Sci, Syracuse, NY 13244 USA; 3.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 4.Univ Washington, Sch Oceanog, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Bhattacharya, Tripti,Tierney, Jessica E.,Addison, Jason A.,et al. Ice-sheet modulation of deglacial North American monsoon intensification[J]. NATURE GEOSCIENCE,2018,11(11):848-+. |
APA | Bhattacharya, Tripti,Tierney, Jessica E.,Addison, Jason A.,&Murray, James W..(2018).Ice-sheet modulation of deglacial North American monsoon intensification.NATURE GEOSCIENCE,11(11),848-+. |
MLA | Bhattacharya, Tripti,et al."Ice-sheet modulation of deglacial North American monsoon intensification".NATURE GEOSCIENCE 11.11(2018):848-+. |
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