Interannual variations of North Equatorial Current transport in the Pacific Ocean during two types of El Niño     

吴国丽  翟方国  胡敦欣 《中国海洋湖沼学报》2016,34(3):585-596

Interannual variations of Pacific North Equatorial Current (NEC) transport during eastern-Pacific El Niños (EP-El Niños) and central-Pacific El Niños (CP-El Niños) are investigated by composite analysis with European Centre for Medium-Range Weather Forecast Ocean Analysis/Reanalysis System 3. During EP-El Niño, NEC transport shows significant positive anomalies from the developing to decay phases, with the largest anomalies around the mature phase. During CP-El Niño, however, the NEC transport only shows positive anomalies before the mature phase, with much weaker anomalies than those during EP-El Niño. The NEC transport variations are strongly associated with variations of the tropical gyre and wind forcing in the tropical North Pacific. During EP-El Niño, strong westerly wind anomalies and positive wind stress curl anomalies in the tropical North Pacific induce local upward Ekman pumping and westward-propagating upwelling Rossby waves in the ocean, lowering the sea surface height and generating a cyclonic gyre anomaly in the western tropical Pacific. During CP-El Niño, however, strength of the wind and associated Ekman pumping velocity are very weak. Negative sea surface height and cyclonic flow anomalies are slightly north of those during EP El Niño.  相似文献   

PRELIMINARY STUDY ON THE FORMATION MECHANISM OF COUNTER WESTERN BOUNDARY UNDERCURRENTS BELOW THE THERMOCLINE——A CONCEPTUAL MODEL   总被引：1，自引：0，他引：1  

王凡  胡敦欣 《中国海洋湖沼学报》1999,(1)

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｗｅｓｔｅｒｎｂｏｕｎｄａｒｙｃｕｒｒｅｎｔｓ(ＷＢＣ),ｃｏｕｎｔｅｒｕｎｄｅｒｃｕｒｒｅｎｔｓｏｂｓｅｒｖｅｄｂｅｌｏｗｔｈｅｔｈｅｒｍｏｃｌｉｎｅｉｎｃｌｕｄｅｔｈｅＭｉｎｄａｎａｏＵｎｄｅｒｃｕｒｒｅｎｔ(ＭＵＣ)ｂｅｎｅａｔｈｔｈｅＭｉｎｄａｎａｏＣｕｒｒｅｎｔ(ＭＣ)(ＨｕａｎｄＣｕｉ,1989,1991;ＷａｎｇａｎｄＨｕ,1998ａ,ｂ;Ｗａｎｇｅｔａｌ.,1998)(Ｆｉｇ.1ａ),ｔｈｅｓｏｕｔｈｗａｒｄｆｌｏｗｂｅｌｏｗｔｈｅＫｕｒｏｓｈｉｏ(ｈｅｒｅｉｎａｆｔｅｒ,ＫＵＣ)(Ｈｕａｎ…  相似文献   

A quasi-synoptic interpretation of water mass distribution and circulation in the western North Pacific II： Circulation   总被引：5，自引：1，他引：4  

谢玲玲  田纪伟  胡敦欣  王凡 《中国海洋湖沼学报》2009,27(4):955-965

  相似文献   

A quasi-synoptic interpretation of water mass distribution and circulation in the western North Pacific： I. Water mass distribution   总被引：2，自引：0，他引：2  

谢玲玲  田纪伟  胡敦欣  王凡 《中国海洋湖沼学报》2009,27(3):630-639

  相似文献   

PN断面东海黑潮的地转经验模态分析   总被引：1，自引：1，他引：0  

刘在科  胡敦欣  孙澈 《海洋与湖沼》2008,39(3):197-201

基于东海PN断面近50年的历史水文数据,本文中作者应用一种斜压流函数空间投影的方法分析冲绳海槽北部黑潮水团的季节性和年代际变异.诊断生成的地转经验模态(GEM)显示黑潮中层水的盐度在夏季相对较低,春季达到最高.通过比较1987年之后CTD数据生成的GEM场与1987年之前BOttle数据生成的GEM场,得以证实黑潮的年代际变化特征,即黑潮表层水近20年来温度升高而盐度减小,同时发现黑潮热带水具有盐度增加而中层水具有盐度减小的趋势.  相似文献   

热带印度洋Rossby波的基本特征     

冯俊乔  白学志  陈永利  胡敦欣 《海洋科学集刊》2010,50(50):23-31

Long wavelength baroclinic oceanic Rossby waves are of interest because they are the main mechanism of energy transfer among the oceanic basins as the rotating fluid adjusts under the forcing of gravity and buoyancy,They play an important role in dynamics and thermodynamics in the ocean.The signature of them is evident from the altimeter measurements.Sea surface beight derived from the multiple ocean satellite altimeter missions over 1993～2008 is analyzed to systematically investigate the characteristics of the Rossby waves in the tropical Indian Ocean,by jointly adopting 2D-FFT,2D-Radon Transform,Complex Empirical Orthogonal Function and the classic linear theory methods.Results are as follows.The energy of Rossby wave is mainly concentrated between 5°S～18°S.Annual Rossby wave can be observed all over the whole badin,whereas semi-annual Rossby wave can bw only detected in the equatorial area, and inter-annual Rossby wave in the off-equatorial region.The phase speeds of Rossby waves detected from altimeter satellites are basically in agreement with the calculation based on the classic linear theory, but the former are some slower(faster) north(south)of 15°S than the later,Furthemore,it is indicated from the CEOF analysis that the annual Rossby waves is apparent in the Bay of Bengal,Arabian Sea ,and the open south Indian Ocean,whereas inter-annual Rossby wave mainly presents in the south Indian Ocean ,and eastward Kelvin wave is dominant along equator.  相似文献