Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0154.1 |
A Robust Null Hypothesis for the Potential Causes of Megadrought in Western North America | |
Ault, Toby R.1; George, Scott St.2; Smerdon, Jason E.3; Coats, Sloan4; Mankin, Justin S.3,5,6; Carrillo, Carlos M.; Cook, Benjamin I.3,5; Stevenson, Samantha7 | |
2018 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:1页码:3-24 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The western United States was affected by several megadroughts during the last 1200 years, most prominently during the Medieval Climate Anomaly (MCA; 800 to 1300 CE). A null hypothesis is developed to test the possibility that, given a sufficiently long period of time, these events are inevitable and occur purely as a consequence of internal climate variability. The null distribution of this hypothesis is populated by a linear inverse model (LIM) constructed from global sea surface temperature anomalies and self-calibrated Palmer drought severity index data for North America. Despite being trained only on seasonal data from the late twentieth century, the LIM produces megadroughts that are comparable in their duration, spatial scale, and magnitude to the most severe events of the last 12 centuries. The null hypothesis therefore cannot be rejected with much confidence when considering these features of megadrought, meaning that similar events are possible today, even without any changes to boundary conditions. In contrast, the observed clustering of megadroughts in the MCA, as well as the change in mean hydroclimate between the MCA and the 1500-2000 period, are more likely to have been caused by either external forcing or by internal climate variability not well sampled during the latter half of the twentieth century. Finally, the results demonstrate that the LIM is a viable tool for determining whether paleoclimate reconstructions events should be ascribed to external forcings or to "out of sample'' climate mechanisms, or if they are consistent with the variability observed during the recent period. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429528800001 |
WOS关键词 | EL-NINO ; EQUATORIAL PACIFIC ; ICE-AGE ; CLIMATE ; DROUGHT ; VARIABILITY ; TELECONNECTIONS ; RECONSTRUCTIONS ; OSCILLATION ; EVOLUTION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/20721 |
专题 | 气候变化 |
作者单位 | 1.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14850 USA; 2.Univ Minnesota, Dept Geog, Minneapolis, MN 55455 USA; 3.Columbia Univ, Lamont Doherty Earth Observ, Div Ocean & Climate Phys, Palisades, NY USA; 4.Natl Ctr Atmospher Res, Climate & Large Scale Dynam Lab, POB 3000, Boulder, CO 80307 USA; 5.NASA, Goddard Inst Space Studies, New York, NY 10025 USA; 6.Dartmouth Coll, Dept Geog, Hanover, NH 03755 USA; 7.Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Ault, Toby R.,George, Scott St.,Smerdon, Jason E.,et al. A Robust Null Hypothesis for the Potential Causes of Megadrought in Western North America[J]. JOURNAL OF CLIMATE,2018,31(1):3-24. |
APA | Ault, Toby R..,George, Scott St..,Smerdon, Jason E..,Coats, Sloan.,Mankin, Justin S..,...&Stevenson, Samantha.(2018).A Robust Null Hypothesis for the Potential Causes of Megadrought in Western North America.JOURNAL OF CLIMATE,31(1),3-24. |
MLA | Ault, Toby R.,et al."A Robust Null Hypothesis for the Potential Causes of Megadrought in Western North America".JOURNAL OF CLIMATE 31.1(2018):3-24. |
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