Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-019-04984-x |
Sensitivity of identifying cut-off lows in the Southern Hemisphere using multiple criteria: implications for numbers, seasonality and intensity | |
Pinheiro, Henri Rossi1; Hodges, Kevin Ivan2; Gan, Manoel Alonso1 | |
2019-12-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53期号:11页码:6699-6713 |
文章类型 | Article |
语种 | 英语 |
国家 | Brazil; England |
英文摘要 | Cut-off Low (COLs) are often associated with heavy precipitation and strong wind events, but there are still uncertainties on how their identification affect the numbers and seasonality. This paper aims to determine the sensitivity of identifying Southern Hemisphere COLs in the ERA-Interim reanalysis to different types of identification criteria. Upper-level cyclones are initially tracked on the 300 hPa level using relative vorticity and geopotential in order to present different perspectives. This reveals significant differences between the numbers and length of the identified tracks for the two fields. To identify the COLs different post-tracking filters are applied which are divided into two steps. Firstly, three filters are considered to separate cut-off lows from open troughs by sampling winds at different offset radial distances from the upper-level cyclonic centres. Secondly, potential vorticity and temperature criteria are imposed to determine how these conditions affect the identified COLs in terms of numbers, seasonality and intensity. It was found that methods based on multiple criteria restrict the COL identification by imposing specific characteristics, while methods based on simpler schemes (e.g. using only winds) can detect larger samples of COLs observed visually in the geopotential maps. Although it is difficult to say which method is more accurate in identifying COLs, because of the subjective aspect of observer's assessment, a scheme using only winds should be more representative of reality as this simply imposes on the detection system a cyclonic circulation appearance regardless of the physical and dynamical characteristics. Therefore, this type of method could be considered as a standard method for identifying COLs that can be used for either operational or research purposes. |
英文关键词 | Cut-off lows Objective methods Identification Criteria Uncertainties |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000494681900012 |
WOS关键词 | ROSSBY-WAVE BREAKING ; NORTHERN-HEMISPHERE ; CLIMATOLOGICAL FEATURES ; VORTICITY ; IDENTIFICATION ; PERSPECTIVE ; TRANSPORT ; TRACKING ; CYCLONE ; IMPACT |
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/224259 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Natl Inst Space Res, Ctr Weather Forecast & Climate Studies, Sao Jose Dos Campos, SP, Brazil; 2.Univ Reading, Dept Meteorol, Reading, Berks, England |
推荐引用方式 GB/T 7714 | Pinheiro, Henri Rossi,Hodges, Kevin Ivan,Gan, Manoel Alonso. Sensitivity of identifying cut-off lows in the Southern Hemisphere using multiple criteria: implications for numbers, seasonality and intensity[J]. CLIMATE DYNAMICS,2019,53(11):6699-6713. |
APA | Pinheiro, Henri Rossi,Hodges, Kevin Ivan,&Gan, Manoel Alonso.(2019).Sensitivity of identifying cut-off lows in the Southern Hemisphere using multiple criteria: implications for numbers, seasonality and intensity.CLIMATE DYNAMICS,53(11),6699-6713. |
MLA | Pinheiro, Henri Rossi,et al."Sensitivity of identifying cut-off lows in the Southern Hemisphere using multiple criteria: implications for numbers, seasonality and intensity".CLIMATE DYNAMICS 53.11(2019):6699-6713. |
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