全球垂向位移负荷潮模式在渤海、黄海、东海及周边区域的准确度评估

本研究利用渤海、黄海、东海及周边区域21个GPS站的调和常数资料,对5个全球垂向位移负荷潮模式（FES2014、EOT11a、GOT4.10c、GOT4.8和NAO.99b）在渤海、黄海、东海及周边区域的准确度进行了评估。结果表明,在渤海、黄海、东海及周边区域,对于M₂分潮,FES2014和EOT11a模式结果准确度相对较高;对于S₂分潮,NAO.99b和EOT11a模式结果准确度相对较高;对于K₁分潮,EOT11a和FES2014模式结果准确度相对较高;对于O₁分潮,EOT11a和GOT4.8模式结果准确度相对较高;对于N₂分潮,EOT11a和FES2014模式结果准确度相对较高;对于K₂分潮,NAO.99b和FES2014模式结果准确度相对较高;对于P₁分潮,EOT11a和GOT4.8模式结果准确度相对较高;对于Q₁分潮,FES2014和EOT11a模式结果准确度相对较高。除此之外,本文还简单分析了渤海、黄海、东海及周边区域8个主要分潮的垂向位移负荷潮分布特征。     

A LAYERED NUMERICAL MODEL FOR SIMULATING THE GENERATION AND PROPAGATION OF INTERNAL TIDES OVER CONTINENTAL SLOPE Ⅲ. NUMERICAL EXPERIMENTS AND SIMULATION

ＩＮＴＲＯＤＵＣＴＩＯＮＴｏｔｅｓｔｔｈｅｌａｙｅｒｅｄｔｈｒｅｅ ｄｉｍｅｎｓｉｏｎａｌｎｏｎｌｉｎｅａｒｎｕｍｅｒｉｃａｌｍｏｄｅｌｐｒｅｓｅｎｔｅｄｉｎＰａｒｔＩ,ｉｔｗａｓａｐ ｐｌｉｅｄｔｏａｓｔｒａｔｉｆｉｅｄ ,ｒｅｃｔａｎｇｕｌａｒ,ａｎｄｔｗｏ ｌａｙｅｒｓｅａａｒｅａｗｉｔｈｓｔｅｐ ｌｉｋｅｔｏｐｏｇｒａｐｈｙｔｏｓｉｍｕｌａｔｅｔｈｅｇｅｎｅｒａｔｉｏｎａｎｄｐｒｏｐａｇａｔｉｏｎｏｆｉｎｔｅｒｎａｌｔｉｄｅｓ.Ｔｈｅｉｎｔｅｒｎａｌｔｉｄｅｖｅｌｏｃｉｔｉｅｓｏｆｔｈｅｕｐｐｅ…     

Numerical Simulation of Wintertime Mesoscale Eddies in the East China Sea

INTRODUCTIONAnimportantachievementofoceanographysincethe 1960swasthediscoveryofmesoscaleed dieswithspatialscaleofhundredsofmeters,andtimescaleofhours;andaverageflowvelocityofabout 10cm s.Theenormousenergyofthemesoscaleeddyiscomparabletothatofacycloneoran ticycloneintheatmosphere .Themesoscaleeddyisoneoftheimportantfactorsthatdecidethechangeoftheocean .Intherecentdecades,ChineseandforeignscientistshavedonelotsofworkontheEastChinaSeasmesoscaleeddies,theformationmechanismofwhicharethefocuso…     

泰国湾及邻近海域潮汐潮流的数值模拟

本文基于FVCOM(Finite-Volume Coastal Ocean Model)模式,模拟了泰国湾及其周边海域K1、O1、M2和S2四个主要分潮。采用47个验潮站实测调和常数与模拟结果进行比较,所得4个分潮的均方差分别为4.06cm、3.76cm、8.22cm和4.71cm,符合良好。根据计算结果分析了泰国湾及其周边海域的潮汐、潮流的分布特征和潮波的传播特征。数值试验表明,现有的数字水深资料(ETOPO1,ETOPO5,DBDB-V)的准确度不足以合理地模拟泰国湾潮波。     

A LAYERED NUMERICAL MODEL FOR SIMULATING THE GENERATION AND PROPAGATION OF INTERNAL TIDES OVER CONTINENTAL SLOPE II STABILITY ANALYSIS

INTRODUCTIONAsoneofthemethodsenablingnumericalsolutionofdifferentialequations,thefinite differ encemethodiswidelyacceptedinthestudyofphysicaloceanography.Afinite differenceschememusthavepropertiesofconvergence ,consistencyandstabilitytoyieldusefulapproximatesolutionoftherelevantdifferentialequations.However,thepropertiesneednotbeverifiedonebyonebecausethewell knownLaxLawassuresthattheconvergenceisequivalenttothestabilityforafinitediffer enceschemewithconsistence .Twomainmethodsforstudyin…     

GLOBAL OCEAN TIDES FROM GEOSAT ALTIMETRY BY QUASI-HARMONIC ANALYSIS

ＩＮＴＲＯＤＵＣＴＩＯＮＯｃｅａｎｔｉｄｅｓｐｌａｙａｖｅｒｙｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｔｈｅｄｙｎａｍｉｃｓｏｆｔｈｅＥａｒｔｈａｎｄｈａｖｅａｔｔｒａｃｔｅｄｍａｎｙｐｅｏｐｌｅ’ｓａｔｔｅｎｔｉｏｎｓｉｎｃｅａｎｃｉｅｎｔｔｉｍｅｓ.Ｂｅｆｏｒｅｔｈｅｌａｔｅ 1 970ｓ,ｔｉｄｅｓｗｅｒｅｍｅａｓｕｒｅｄｍａｉｎｌｙｂｙｃｏａｓｔａｌｇａｕｇｅｓ .Ｄｉｒｅｃｔｍｅａｓｕｒｅｍｅｎｔｓａｓｗｅｌｌａｓｎｕｍｅｒｉｃａｌｓｉｍｕｌａｔｉｏｎｓ,ｃａｎｐｒｏｖｉｄｅｆａｉｒｌｙａｃｃｕｒａｔｅｕ…     

NUMERICAL SIMULATION AND DYNAMIC STUDY OF THE WINTERTIME CIRCULATION OF THE BOHAI SEA

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＢｏｈａｉＳｅａ,ａｎａｌｍｏｓｔ ｃｌｏｓｅｄｓｈａｌｌｏｗｓｅａ,ｌｉｅｓｎｏｒｔｈｗｅｓｔｔｏｔｈｅＹｅｌｌｏｗＳｅａ.Ｆｉｇ.1ａｓｈｏｗｓｔｈｅｇｅ ｏｍｅｔｒｙｏｆｔｈｅｓｈｏｒｅｌｉｎｅａｎｄｔｈｅｗａｔｅｒｄｅｐｔｈｄｉｓｔｒｉｂｕｔｉｏｎｏｆｔｈｅＢｏｈａｉＳｅａ,ｗｈｉｃｈｉｓｓｍａｌｌａｎｄｓｈａｌｌｏｗｃｏｍ ｐａｒｅｄｗｉｔｈｔｈｅＹｅｌｌｏｗＳｅａｏｒｔｈｅＥａｓｔＣｈｉｎａＳｅａ.Ｔｈｅｍｅａｎｄｅｐｔｈｉｓｌｅｓｓｔｈａｎ 2 0ｍｅｔｅｒｓ.Ｂｅ…     

ADI BAROTROPIC OCEAN MODEL FOR SIMULATON OF KUROSHIO INTRUSION INTO CHINA SOUTHEASTERN WATERS

In this numerical model for simulating the Kuroshio intrusion into the East and South China Seas,vertically averaged marine hydrodynamic equations governing ocean currents and long-period waves areapproximated by a set of two-time-level semi-implicit finite difference equations. The major terms in-cluding the local acceleration, sea-surface slope, Coriolis force and the bottom friction are approxi-mated with the Crank-Nicholson scheme, which is of second order accuracy. The advection terms are app-roximated with the Leith scheme. The difference equations are split into two sets of alternating directionimplicit quations, each of which has a tridiagonal matrix and can be easily solved. The model reproduces a major Kuroshio intrusion north of Luzon Island, one north of Taiwan Island, andone west of the Tokara Strait. The model shows a current system running from the Luzon Strait to the coastof Vietnam and Hainan Island, through the Taiwan Strait and then into the Tsushima Strait. The summerand winter monso     

印度尼西亚近海潮汐潮流的数值模拟

利用FVCOM海洋数值模式计算了印尼近海的M2,S2,K1,O1分潮的分布,计算范围从20°S～20°N,90°～150°E,计算网格分辨率在印尼海域岛屿平均为1/12度,在大陆边界平均为1/5度,在开边界平均为1/2度.计算结果与104个TOPEX/Poseidon卫星高度计交叉点数据和79个验潮站数据进行比较,符合良好;与高度计交叉点比较,M2分潮振幅的均方根差为6 cm,迟角为7°;S2分潮的振幅偏差为3 cm,迟角偏差为8°;K1分潮振幅的偏差为6 cm,迟角偏差为10°;O1分潮振幅偏差为3 cm,迟角偏差为10°.根据计算结果给出了4个分潮的潮汐、潮流、潮余流和潮能通量密度分布图.     

洋际交换及其在全球大洋环流中的作用:MOM4p1积分1400年的结果

利用非Boussinesq近似下MOM4p1的全球大洋环流预后模式,采用真实地形,以静止状态为初始条件,进行了1 400a积分,以研究平衡状态下大洋环流的结构。模式由月平均气候态强迫场驱动,包括192×189个水平网格和压力坐标下的31个垂直层次。着重研究达到平衡状态后,各洋际通道处的质量、热量输运和补偿及其在全球大洋环流中的作用。根据动能演变特征表明,积分过程分为3个阶段:风海流的成长及准稳定状态;热盐环流的成长过程以及热盐环流的稳定状态;由静止状态冷启动达到热盐环流的稳定状态,积分过程必须在千年以上。模式结果再现了从白令海峡到格陵兰海的北冰洋贯穿流和印度尼西亚贯穿流,并用已有观测资料对它们进行对比。分析表明,海面的倾斜结构是形成太平洋-北冰洋-大西洋贯穿流和印尼贯穿流的主要动力机制。分析指出,尽管在北大西洋存在1.4×106 m3/s的南向体积输运,但其热量输运却是北向的并达到1015 W量级,其原因是北向的上层海流温度远高于北大西洋深层水向南的回流。文章分析了经向体积和热量输运对北大西洋深层水补偿来源及大西洋经向翻转环流的贡献。模拟所得洋际交换的量值可以由经向补偿予以合理解释,并得到以往实测与数模结果的支持。洋际通道处的体积和热量交换突出体现了其在大洋传送带系统中的枢纽作用。