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DOI | 10.1002/joc.5080 |
The role of intraseasonal variability at mid-high latitudes in regulating Pacific blockings during boreal winter | |
Yang, Shuangyan1,2,3; Li, Tim1,2,3 | |
2017-08-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | By using daily National Centers for Environmental Prediction-Department of Energy reanalysis data from 1979 to 2015, we investigated the connection between Pacific blockings and mid-high latitude atmospheric intraseasonal oscillation (ISO) at 500 hPa in boreal winter. The ISO perturbation over a key area of 150 degrees E-155 degrees W, 60 degrees-75 degrees N is most co-variated with Pacific blockings. The averaged geopotential height over this key area exhibits a statistically significant 10-35-day periodicity. The ISO perturbation associated with the Pacific blocking activity shows pronounced westward propagation. The perturbation initiates at about 120 degrees W, triggered by intraseasonal wave energy accumulation. A geopotential tendency diagnosis reveals that the time change rate of the geopotential height over the key area is primarily attributed to the advection of planetary vorticity by the ISO meridional flow. A mechanism is put forward in which the westward-propagating ISO perturbations induce a blocking over the Pacific sector. When a strong northward ISO flow arrives in the key area, it acts against the gradient of planetary vorticity, leading to a negative vorticity advection. This negative advection tends to strengthen local anticyclonic vorticity and geopotential height anomalies. Thus, the westward-propagating ISO meridional flow plays an active role in inducing the low-frequency blocking activity over the Pacific sector. |
英文关键词 | Pacific blocking intraseasonal oscillation at mid-high latitude wave energy accumulation geopotential tendency |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417298600084 |
WOS关键词 | NORTH-ATLANTIC OSCILLATION ; GEOGRAPHICAL DEPENDENCE ; PERSISTENT ANOMALIES ; DECADAL RELATIONSHIP ; EUROPEAN BLOCKING ; SUMMER ; IMPACT ; SCALE ; PROPAGATION ; CIRCULATION |
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/37317 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME,CIC FEMD, Joint Int Res Lab Climate & Environm Change ILCEC, Nanjing, Jiangsu, Peoples R China; 2.Univ Hawaii Manoa, Int Pacific Res Ctr, POST Bldg,Room 401,1680 East West Rd, Honolulu, HI 96822 USA; 3.Univ Hawaii Manoa, Dept Atmospher Sci, POST Bldg,Room 401,1680 East West Rd, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Yang, Shuangyan,Li, Tim. The role of intraseasonal variability at mid-high latitudes in regulating Pacific blockings during boreal winter[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37. |
APA | Yang, Shuangyan,&Li, Tim.(2017).The role of intraseasonal variability at mid-high latitudes in regulating Pacific blockings during boreal winter.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37. |
MLA | Yang, Shuangyan,et al."The role of intraseasonal variability at mid-high latitudes in regulating Pacific blockings during boreal winter".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37(2017). |
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