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DOI | 10.1175/JCLI-D-18-0206.1 |
An Intraseasonal Mode of Atmospheric Variability Relevant to the US Hydroclimate in Boreal Summer: Dynamic Origin and East Asia Connection | |
Zhao, Siyu; Deng, Yi; Black, Robert X. | |
2018-12-01 | |
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:24页码:9855-9868 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Intraseasonal modes of atmospheric variability over the Northern Hemisphere (NH) midlatitudes in boreal summer are identified via an empirical orthogonal function (EOF) analysis of the daily 10-90-day bandpass-filtered 250-hPa streamfunction for the period of 1950-2016. The first two EOF modes are characterized, respectively, by (i) a single-signed streamfunction anomaly that extends across the NH and (ii) a regional dipole structure with centers over the Aleutian Islands and northeastern Pacific. The third EOF mode (EOF-3) is a quasi-stationary wave train over the Pacific-North American sector with an equivalent barotropic structure in the vertical. EOF-3 is associated with a northwest-southeast oriented anomalous precipitation dipole over the United States. A nonmodal instability analysis of the boreal summer climatological flow in terms of the 250-hPa streamfunction reveals that one of the top optimal mode disturbances mimicking the EOF-3 structure grows from an initial precursor disturbance over East Asia through extracting kinetic energy from background flow and attains its maximum amplitude in around nine days. An additional lag regression analysis illustrates that anomalous latent heating associated with cloud and precipitation formation over East Asia is responsible for generating the precursor disturbance for the EOF-3-like optimal mode. This result suggests the existence of an important connection between the hydrological cycles of East Asia and North America, which is dynamically intrinsic to the boreal summer upper-tropospheric flow. Knowledge of such a connection will help us better understand and model hydroclimate variability over these two continents. |
英文关键词 | Barotropic flows Rossby waves Synoptic climatology Teleconnections Precipitation Intraseasonal variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000450407600004 |
WOS关键词 | NORTHERN-HEMISPHERE ; BAROTROPIC INSTABILITY ; TELECONNECTION PATTERN ; OPTIMAL PERTURBATIONS ; OPTIMAL EXCITATION ; CLIMATE EXTREMES ; UNITED-STATES ; ROSSBY WAVES ; PACIFIC ; WINTER |
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/20237 |
专题 | 气候变化 |
作者单位 | Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA |
推荐引用方式 GB/T 7714 | Zhao, Siyu,Deng, Yi,Black, Robert X.. An Intraseasonal Mode of Atmospheric Variability Relevant to the US Hydroclimate in Boreal Summer: Dynamic Origin and East Asia Connection[J]. JOURNAL OF CLIMATE,2018,31(24):9855-9868. |
APA | Zhao, Siyu,Deng, Yi,&Black, Robert X..(2018).An Intraseasonal Mode of Atmospheric Variability Relevant to the US Hydroclimate in Boreal Summer: Dynamic Origin and East Asia Connection.JOURNAL OF CLIMATE,31(24),9855-9868. |
MLA | Zhao, Siyu,et al."An Intraseasonal Mode of Atmospheric Variability Relevant to the US Hydroclimate in Boreal Summer: Dynamic Origin and East Asia Connection".JOURNAL OF CLIMATE 31.24(2018):9855-9868. |
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