Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3234-0 |
Observed variability in the upper layers at the Equator, 90 degrees E in the Indian Ocean during 2001-2008, 1: zonal currents | |
Rao, R. R.1; Horii, T.2; Masumoto, Y.2,3; Mizuno, K.2 | |
2017-08-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | India; Japan |
英文摘要 | The observed variability of zonal currents (ZC) at the Equator, 90A degrees E shows a strong seasonal cycle in the near-surface 40-350 m water column with periodic east-west reversals most pronounced at semiannual frequency. Superposed on this, a strong intraseasonal variability of 30-90 day periodicity is also prominently seen in the near-surface layer (40-80 m) almost throughout the year with the only exception of February-March. An eastward flowing equatorial undercurrent (EUC) is present in the depth range of 80-160 m during March-April and October-November. The observed intraseasonal variability in the near-surface layer is primarily determined by the equatorial zonal westerly wind bursts (WWBs) through local frictional coupling between the zonal flow in the surface layer and surface zonal winds and shows large interannual variability. The eastward flowing EUC maintained by the ZPG set up by the east-west slope of the thermocline remotely controlled by the zonal wind (ZW) and zonally propagating wave fields also shows significant interannual variability. This observed variability on interannual time scales appears to be controlled by the corresponding variability in the alongshore winds off the Somalia coast during the preceding boreal winter, the ZW field along the equator, and the associated zonally propagating Kelvin and Rossby waves. The salinity induced vertical stratification observed in the near-surface layer through barrier layer thickness (BLT) effects also shows a significant influence on the ZC field on intraseasonal time scale. Interestingly, among all the 8 years (2001-2008), relatively weaker annual cycle is seen in both ZC in the 40-350 m water column and boreal spring sea surface temperature (SST) only during 2001 and 2008 along the equator caused through propagating wave dynamics. |
英文关键词 | Indian Ocean Equatorial zonal currents Equatorial undercurrent Intraseasonal variability Westerly wind bursts Interannual variability Barrier layer thickness Sea surface temperature |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000407244700019 |
WOS关键词 | EASTERN ARABIAN SEA ; INTRASEASONAL VARIABILITY ; INTERANNUAL VARIABILITY ; SURFACE CURRENTS ; SUMMER MONSOON ; BARRIER-LAYER ; MIXED-LAYER ; SEASONAL CIRCULATION ; ROSSBY WAVES ; TOGA DECADE |
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/35788 |
专题 | 气候变化 |
作者单位 | 1.IITM, ICMPO, Pune, Maharashtra, India; 2.JAMSTEC, Yokosuka, Kanagawa, Japan; 3.Univ Tokyo, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Rao, R. R.,Horii, T.,Masumoto, Y.,et al. Observed variability in the upper layers at the Equator, 90 degrees E in the Indian Ocean during 2001-2008, 1: zonal currents[J]. CLIMATE DYNAMICS,2017,49(3). |
APA | Rao, R. R.,Horii, T.,Masumoto, Y.,&Mizuno, K..(2017).Observed variability in the upper layers at the Equator, 90 degrees E in the Indian Ocean during 2001-2008, 1: zonal currents.CLIMATE DYNAMICS,49(3). |
MLA | Rao, R. R.,et al."Observed variability in the upper layers at the Equator, 90 degrees E in the Indian Ocean during 2001-2008, 1: zonal currents".CLIMATE DYNAMICS 49.3(2017). |
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