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   

A numerical study on seasonal variations of the Taiwan Warm Current   总被引：3，自引：0，他引：3  

白学志  胡敦欣 《中国海洋湖沼学报》2004,22(3):278-285

Princeton Ocean Model (POM) is employed to investigate the Taiwan Warm Current (TWC) and its seasonal variations. Results show that the TWC exhibits pronounced seasonal variations in its sources, strength and flow patterns. In summer, the TWC flows northeast in straight way and reaches around 32°N; it comes mainly from the Taiwan Strait, while its lower part is from the shelf-intrusion of the Kuroshio subsurface water (KSSW). In winter, coming mainly from the shelf-intrusion of the Kuroshio northeast of Taiwan, the TWC flows northward in a winding way and reaches up around 30°N. The Kuroshio intrusion also has distinct seasonal patterns. The shelf-intrusion of KSSW by upwelling is almost the same in four seasons with a little difference in strength; it is a persistent source of the TWC. However, Kuroshio surface water (KSW) can not intrude onto the shelf in summer, while in winter the intrusion of KSW always occurs. Additional experiments were conducted to examine effects of winds and transport through  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   

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   

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   

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   

Simple ecosystem model of the central part of the East China Sea in spring   总被引：6，自引：0，他引：6  

崔茂常  王荣  胡敦欣  袁耀初 《中国海洋湖沼学报》1997,15(1):80-87

ImODUrnONTheobjeCtiveoftheJointGobaldrinFluxStudy(JGoFS)istogainunder-standingoftheglobalbiogeochdricalCycling(ofcarbonandotherbiogenicelemetS)whichplaysaTnaorroleininIlUencintheworkldrite.OnofitSessentinlcomPonentSistocharaCtedrithernarineprharybiomassproductionandthefixationofCO=bytheocan.AmngtheproassesaffedgVCrthalfluxofcarbontotheinterioroftheoean,thebiologhalproass,thesocalled"biologhalpUmP,',isthemostirnPortantone.bologicalmodellingisamehodtorelateleVeIs,distributionandfluC…  相似文献   

秋末南黄海的透光度及其与环流的关系   总被引：2，自引：0，他引：2  

赵保仁  胡敦欣  熊庆成 《海洋科学集刊》1986,(27):97-106

随着现代光学仪器的发展，人们越来越多地利用海水的浊度、透光度或光束的吸收系数等在海洋中的分布来讨论海流、水团混合、海洋锋面等水文现象，以此作为温、盐等水文资料的重要补充。例如，Drake用表层海水的透光度揭示了Santa Barbar海峡中的环流状态。Matsuike和Morinaga曾用日本南岸黑潮区域中的光束吸收系数揭示了沿岸水进人黑潮主流的混合现象。Matsuike 等用光束吸收系数研究了长江冲淡水与外海高盐水之间和黄海沿岸水与东海高盐水之间的锋面特征。上述研究都是卓有成效的。 然而，在我国还很少使用过类似的方法来研究有关的海洋水文现象。1983年11月在中美南黄海环流与沉积动力学联合调查研究的首航调查中，使用25cm光程的透光度计(Transmissometer)精确地测定了南黄海的透光度值。本文将以这些资料为基础，阐明南黄海透光度值的分布规律及其同南黄海的水团分布、环流状态、潮汐运动等水文现象之间的关系。 25cm光程透光度计用产生波长为660nm红光的发光二极管作光源，这种光源接近单色，在蒸馏水中经过25cm光程后，仪器测得的最大透光度值为90%。由于该仪器使用单色红光光源，海水中的腐植酸等黄色物质对它影响很小，因此测得的透光度值可较真实地反映海水中悬浮物含量的多少。调查中将透光度计的信号接入Mark-III型CTD的备用通道，因此它的取样速率同温、盐等要素一样。 本次调查共设7个断面，54个CTD观测站，测站和断面分布如图1所示。  相似文献