Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.5133 |
Dipole behaviour in maximum significant wave height over the Southern Indian Ocean | |
Gupta, Nitika1; Bhaskaran, Prasad K.1; Dash, Mihir K.2 | |
2017-11-30 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:14 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | The study reports on existence of a dipole pattern in maximum significant wave height (MSWH) as well in mean significant wave height over the Southern Indian Ocean (SIO) based on analysis using 24years of satellite observations. Analysis using quality checked daily altimeter data from nine satellite missions for entire Indian Ocean region revealed the spatio-temporal variability of observed dipole phenomena. Interestingly, the second empirical orthogonal function (EOF) mode (EOF2) in monthly and monthly anomaly MSWH data clearly shows the prevalence of dipole over the SIO having a period of 6months for monthly dataset Principal Component (PC) leading to a 3months oscillation. The EOF of monthly anomaly dataset analysis also exhibited a similar dipole pattern for the EOF2 mode having a period of 2.1years. In addition, the study also considered seasonal EOF analysis for four austral seasons December-January-February (DJF), March-April-May (MAM), June-July-August (JJA), and September-October-November (SON). The EOF2 for all seasons exhibits a similar dipole pattern in SIO basin, except for the DJF months. Based on seasonal EOF analysis, the DJF and JJA EOF2s have similar dipole pattern that reverses its polarity because of wind variability for the MAM and SON EOF2s justifying 3months dipole oscillation obtained for monthly datasets. The Radon transform is used to investigate the orientation of this dipole, and for the first time this method is used in the field of climatology to study orientation and the degree of polarity of a dipole pattern. Furthermore, the study investigated possible correlation of dipole with various proven climate indices establishing the fact that Southern Annular Mode Index (SAMI) showed a significant correlation. The other seasonal datasets also correlated well with SAMI, except DJF months that do not show the dipole pattern, and it had a good correlation with Nino3 index representing the El Nino Southern Oscillation Index. |
英文关键词 | empirical orthogonal function satellite observations Indian Ocean significant wave height Radon transform climate indices Southern Annular Mode |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414322800013 |
WOS关键词 | ANNULAR MODE ; CLIMATE ; WIND ; VARIABILITY ; ALTIMETER ; TRENDS ; INDEX |
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/37349 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Technol, Dept Ocean Engn & Naval Architecture, Kharagpur 721302, W Bengal, India; 2.Indian Inst Technol, Ctr Oceans Rivers Atmosphere & Land Sci, Kharagpur, W Bengal, India |
推荐引用方式 GB/T 7714 | Gupta, Nitika,Bhaskaran, Prasad K.,Dash, Mihir K.. Dipole behaviour in maximum significant wave height over the Southern Indian Ocean[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(14). |
APA | Gupta, Nitika,Bhaskaran, Prasad K.,&Dash, Mihir K..(2017).Dipole behaviour in maximum significant wave height over the Southern Indian Ocean.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(14). |
MLA | Gupta, Nitika,et al."Dipole behaviour in maximum significant wave height over the Southern Indian Ocean".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.14(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论