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DOI | 10.1007/s00382-019-04852-8 |
Assessment of climatological tropical cyclone activity over the north Indian Ocean in the CORDEX-South Asia regional climate models | |
Vishnu, S.1,2; Sanjay, J.1; Krishnan, 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:5101-5118 |
文章类型 | Article |
语种 | 英语 |
国家 | India; USA |
英文摘要 | This study evaluates the ability of the regional climate models (RCMs) in the Coordinated Regional Climate Downscaling Experiment for South Asia (CORDEX-SA) to simulate the tropical cyclone activity in the north Indian Ocean. The RCMs used in the CORDEX-SA are Rossby Centre regional atmospheric model version 4 (RCA4) and Regional Climatic Model version 4 (RegCM4) forced by the ECMWF Interim Reanalysis (ERA-Interim) from 1989 to 2008. Both models have reasonable skill in capturing the observed climatological seasonal and spatial distribution of the genesis and track of the tropical cyclones. However, the two issues faced are (i) in RegCM4 model, higher number of tropical cyclones throughout the year compared to observations in addition to the unrealistic simulation of tropical cyclones during winter and (ii) in the RCA4 model, relatively higher tropical cyclone activity over the Arabian Sea compared to the Bay of Bengal. In the RCA4, the anomalous large-scale lower tropospheric cyclonic circulation observed over the southern Arabian Sea might be responsible for the overestimation in the number of tropical cyclones over there. In both models, the relationship between minimum pressure and the maximum wind is well simulated even though there is an underestimation in the intensity of the tropical cyclones. Quantitative analysis of large-scale environmental parameters that influence the tropical cyclone activity using an index called genesis potential index showed that in the RegCM4 model, the model simulates seasonal variation (enhancement/suppression) of environmental conditions fairly good as seen in the observation. However, the model has higher number of tropical cyclones in all the seasons, which is due to the enhanced large scale dynamical and thermodynamical parameters. The cold and wet bias in the middle troposphere causes the reduction in the mid-layer saturation deficit throughout the year, which in turn favours an unrealistic high number of tropical cyclone genesis. Therefore, the changes in the large scale dynamics and relatively saturated middle troposphere in the model might be responsible for the higher number of tropical cyclones. |
英文关键词 | CORDEX Tropical cyclone Indian Ocean Regional climate model Genesis potential index |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489753900075 |
WOS关键词 | CONVECTION SCHEME ; POTENTIAL INDEX ; SIMULATION ; RESOLUTION ; MONSOON ; FREQUENCY ; INTENSITY ; GENESIS ; PACIFIC ; REGCM4 |
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/187264 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Trop Meteorol, Ctr Climate Change Res, Pune 411008, Maharashtra, India; 2.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Vishnu, S.,Sanjay, J.,Krishnan, R.. Assessment of climatological tropical cyclone activity over the north Indian Ocean in the CORDEX-South Asia regional climate models[J]. CLIMATE DYNAMICS,2019,53:5101-5118. |
APA | Vishnu, S.,Sanjay, J.,&Krishnan, R..(2019).Assessment of climatological tropical cyclone activity over the north Indian Ocean in the CORDEX-South Asia regional climate models.CLIMATE DYNAMICS,53,5101-5118. |
MLA | Vishnu, S.,et al."Assessment of climatological tropical cyclone activity over the north Indian Ocean in the CORDEX-South Asia regional climate models".CLIMATE DYNAMICS 53(2019):5101-5118. |
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