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DOI | 10.1007/s00382-019-04782-5 |
Atmospheric blocking and intercomparison of objective detection methods: flow field characteristics | |
Pinheiro, M. C.1; Ullrich, P. A.1,2; Grotjahn, R.1 | |
2019-10-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:4189-4216 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Objective methods for identifying and quantifying atmospheric blocking have been developed over recent decades, primarily targeting North Atlantic blocks. Differences arise from these methods, leading to changes in the resultant blocking climatology. To understand these differences, and better inform future assessments built on quantitative detection of blocks, this paper examines blocking properties produced by three different objective detection algorithms over the global extratropics. Blocking criteria examined include 500 hPa geopotential height anomaly (Z*), column-averaged potential vorticity anomaly (PV*), and 500 hPa geopotential height gradient (AGP). Results are analyzed for blocking climatologies and for instantaneous blocking patterns, as well as distributions of block size, speed, duration, and distance traveled. The results emphasize physical characteristics of the flow field and the subsequent blocking regions that emerge; overall, PV* and Z* blocked regions often have higher pattern correlation and spatial similarity, though these two methods also display high agreement with AGP in some instances. Z* finds the largest (and greatest number of) blocked regions, while PV*-detected regions are smallest in all instances except Southern Hemisphere winter. In some cases, PV* tracks a nearby jet streak, leading to differences with height-based algorithms. All three algorithms detect some questionable low-latitude blocks that are stationary and persist but do not impair zonal flow, although at different times. Therefore, careful consideration of the algorithm biases is important in future blocking studies. For example, linking extreme weather to detected blocking could vary substantially depending on the algorithm used. |
英文关键词 | Blocking Objective detection Climate variability Climatology |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489753900027 |
WOS关键词 | NORTHERN-HEMISPHERE BLOCKING ; CLIMATOLOGY ; ANTICYCLONES ; CALIFORNIA ; EVENTS |
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/187216 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Davis, Dept Land Air & Water Resources, 1 Shields Ave, Davis, CA 95616 USA; 2.Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA USA |
推荐引用方式 GB/T 7714 | Pinheiro, M. C.,Ullrich, P. A.,Grotjahn, R.. Atmospheric blocking and intercomparison of objective detection methods: flow field characteristics[J]. CLIMATE DYNAMICS,2019,53:4189-4216. |
APA | Pinheiro, M. C.,Ullrich, P. A.,&Grotjahn, R..(2019).Atmospheric blocking and intercomparison of objective detection methods: flow field characteristics.CLIMATE DYNAMICS,53,4189-4216. |
MLA | Pinheiro, M. C.,et al."Atmospheric blocking and intercomparison of objective detection methods: flow field characteristics".CLIMATE DYNAMICS 53(2019):4189-4216. |
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