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DOI | 10.1007/s00382-016-3256-7 |
Understanding the control of extratropical atmospheric variability on ENSO using a coupled data assimilation approach | |
Lu, Feiyu1; Liu, Zhengyu1,2; Liu, Yun3,4; Zhang, Shaoqing5; Jacob, Robert6 | |
2017-05-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | The control of extratropical atmospheric variability on ENSO variability is studied in a coupled general circulation model (CGCM) utilizing an ensemble-based coupled data assimilation (CDA) method in the perfect-model framework. Assimilation is limited to the desired model components (e.g. atmosphere) and spatial areas (e.g. the extratropics) to study the ensemble-mean model response (e.g. tropical response to "observed" extratropical atmospheric variability). The CDA provides continuously "corrected" extratropical atmospheric forcing and boundary conditions for the tropics and the use of ensemble optimizes the observational forcing signal over internal variability in the model component or region without assimilation. The experiments demonstrate significant control of extratropical atmospheric forcing on ENSO variability in the CGCM. When atmospheric "observations" are assimilated only poleward of 20A degrees in both hemispheres, most ENSO events in the "observation" are reproduced and the error of the Nino3.4 index is reduced by over 40 % compared to the ensemble control experiment that does not assimilate any observations. Further experiments with the assimilation in each hemisphere show that the forced ENSO variability is contributed roughly equally and independently by the Southern and Northern Hemisphere extratropical atmosphere. Further analyses of the ENSO events in the southern hemisphere forcing experiment reveal robust precursors in both the extratropical atmosphere over southeastern Pacific and equatorial Pacific thermocline, consistent with previous studies of the South Pacific Meridional Mode and the discharge-recharge paradigm, respectively. However, composite analyses based on each precursor show that neither precursor alone is sufficient to trigger ENSO onset by itself and therefore neither alone could serve as a reliable predictor. Additional experiments with northern hemisphere forcing, ocean assimilation or different latitudes are also performed. |
英文关键词 | ENSO Variability Precursors Coupled model dynamics Coupled data assimilation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399431900020 |
WOS关键词 | PACIFIC MERIDIONAL MODE ; ENSEMBLE KALMAN FILTER ; SEASONAL FOOTPRINTING MECHANISM ; EL-NINO ; EQUATORIAL PACIFIC ; ANNUAL CYCLE ; PARAMETER-ESTIMATION ; TROPICAL PACIFIC ; OCEAN ; CLIMATE |
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/36141 |
专题 | 气候变化 |
作者单位 | 1.Univ Wisconsin Madison, Nelson Inst Ctr Climat Res, Dept Atmospher & Ocean Sci, 1225 W Dayton St, Madison, WI 53706 USA; 2.Peking Univ, Lab Climate Ocean & Atmosphere Studies, Beijing, Peoples R China; 3.Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA; 4.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA; 5.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA; 6.Argonne Natl Lab, Math & Comp Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA |
推荐引用方式 GB/T 7714 | Lu, Feiyu,Liu, Zhengyu,Liu, Yun,et al. Understanding the control of extratropical atmospheric variability on ENSO using a coupled data assimilation approach[J]. CLIMATE DYNAMICS,2017,48. |
APA | Lu, Feiyu,Liu, Zhengyu,Liu, Yun,Zhang, Shaoqing,&Jacob, Robert.(2017).Understanding the control of extratropical atmospheric variability on ENSO using a coupled data assimilation approach.CLIMATE DYNAMICS,48. |
MLA | Lu, Feiyu,et al."Understanding the control of extratropical atmospheric variability on ENSO using a coupled data assimilation approach".CLIMATE DYNAMICS 48(2017). |
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