Seasonal and intraseasonal variations of the surface Taiwan Warm Current   总被引：1，自引：0，他引：1  

崔茂常胡敦欣  吴玲娟 《中国海洋湖沼学报》2004,22(3):271-277

To study seasonal and intraseasonal variations of the Taiwan Warm Current (TWC) in detail Rotated Empirical Orthogonal Function (REOF) and Extended Associate Pattern Analysis (EAPA) are jointly adopted with daily sea surface salinity (SSS), sea surface temperature (SST) and sea surface height (SSH) datasets covering 1126 days from American Navy Experimental Real-Time East Asian Seas Ocean Nowcast System in the present paper. Results show that the first and second REOFs of SST in the southern East China Sea (SECS) account for 50.8% and 39.8% of the total variance. The surface TWC contains persistent (multi-year mean), seasonal and intraseasonal components. The persistent one mainly inosculates with the Kuroshio but the seasonal and intraseasonal ones are usually active only on the continental shelf. Its persistent component is produced by inertial flow of the Kuroshio, however its seasonal and intraseasonal ones seems coming from seasonal and intraseasonal oscillations of monsoon force. The seasonal one reaches its maximum in late summer,lasting about four months and the intraseasonal one takes place at any seasons, lasting more than 40 days.  相似文献   

Current observations in the southern Yellow Sea in summer     

唐晓晖  王凡  陈永利  白虹  胡敦欣 《中国海洋湖沼学报》2004,22(3):217-223

Current data from three moored Acoustic Doppler Profilers (ADPs) deployed in the southern Yellow Sea at sites A (1-24.17°E, 34.82°N), B (122.82°E, 35.65°N) in summer 2001 and site C (120.85°E, 34.99°N) in summer 2003 were analyzed in this paper. Features of the tidal and residual currents were studied with rotary spectral and cross-spectral methods. Main achievements were as follows: 1) Tides dominated the currents. At sites A and B, the semidiurnal tidal current was basically homogeneous in the whole depth, taking a clockwise rotation at site A, and near-rectilinear counterclockwise rotation at site B; while the diurnal tidal current was strong and clockwise near the surface, but decreased and turned counterclockwise with depth; at site C, semidiurnal tidal current dominated and diurnal current took the second, both of which were counterclockwise and vertically homogeneous. Inertial motion contributed to the clockwise component of diurnal fluctuations; 2) The 3-5d fluctuation of residual current w  相似文献   

Surface circulation patterns observed by drifters in the Yellow Sea in summer of 2001, 2002 and 2003   总被引：2，自引：0，他引：2  

庞重光  梁兼霞  胡敦欣  王凡  陈永利  白虹  白学志 《中国海洋湖沼学报》2004,22(3):209-216

In summer of 2001, 2002 and 2003, ten, six and seventeen satellite-tracked surface drifters with drogues centered at 15 and 4 m were deployed, respectively, in the southern Yellow Sea (YS). 23 drifters of them transmitted useful data of at least 30 days. The wind-driven component of the drift was removed from the original drift velocity of drifters. The wind data used are from NCEP (National Center for Environmental Prediction), USA.Trajectories and drift velocities of the 23 drifters depicted the upper circulation structure in the southern YS. There exists an anti-cyclonic eddy with a mean speed and radius of 0.063 m/s and 50km in the central southern YS, whose center lingered within 35.3-36.0°N / 123.5-124.0°E. Showed by 6 drifters, a basin-scale elliptic cyclonic gyre with a mean speed of 0.114 m/s, long and short radius of 250 and 200 km surrounds the anti-cyclonic eddy. In the southwestern part of the southern YS has obvious frontal eddy activities within about 100 km with a mean speed about 0.076  相似文献   

Numerical Study of Water and Suspended Matter Exchange Between the Yellow Sea and the East China Sea   总被引：3，自引：1，他引：2  

庞重光  白学志  胡敦欣 《中国海洋湖沼学报》2003,21(3):214-221

INTRODUCTIONTheYellowSeaandtheEastChinaSea (ECS)aremarginalseasofthenorthwestPacificandhaveexpansivecontinentalshelves .TheuniqueandstrikingfeaturesoftheYellowSeaandtheECSarethattheyhavestrongtidalcurrent;aresubjecttostrongmonsooninfluence ;andreceiveinflowfromthebiggestriverinChina ,theChangjiangRiver ;andthatthefamouswesternboundarycurrent,theKuroshio ,passesthroughtheECS ,withitsbranchesintrudingupwardintothecontinentalshelfareas.Generallyspeaking ,thewaterexchangecapacityofthe…  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   

RESPONSE OF THE EQUATORIAL WESTERN PACIFIC THERMOHALINE STRUCTURE TO WIND VARIATION     

胡敦欣  David Halpern 《中国海洋湖沼学报》1986,(2)

During the Global Weather Experiment oceanographic measurements were recorded during winter and summer in the western Pacific region 5°S-5°N,160°E-175°E. The variations of the upper ocean temperature and salinity fields were produced by the large seasonal and spatial wind fluctuations. The vertical temperature structure of the thermocline at the equator, the meridional slope of the thermocline south of the equator, and the northward penetration of high salinity water were related to the direction and intensity of the zonal wind-stress.  相似文献