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1.
Using widespread conductivity–temperature–depth (CTD) data in the Philippine Sea and northern South China Sea near the Luzon
Strait together with altimeter data, we identified an intrusion of water from the Kuroshio into the South China Sea (SCS)
through the Luzon Strait in September 2008. The Kuroshio water obviously intruded into the SCS from 20 to 21°N, and existed
mainly in the upper 300 m. The intrusion water extended as far west as 117°E, then looped around in an anticyclonic eddy and
returned to the Philippine Sea further north. The dynamics of the Kuroshio intrusion are discussed using a 1.5-layer nonlinear
shallow-water reduced-gravity model. The analysis suggests that the strong cyclonic eddy to the east of the Kuroshio in September
2008 was of benefit to the intrusion event. 相似文献
2.
Lingling Xie Jiwei Tian Shuwen Zhang Yanwei Zhang Qingxuan Yang 《Journal of Oceanography》2011,67(1):37-46
The complicated flow pattern in the intermediate layer of the Luzon Strait could directly affect the efficiency of the water
and energy exchange between the South China Sea (SCS) and the North Pacific. Here we present a subsurface anticyclonic eddy
in the Luzon Strait deduced using observations conducted in October 2005. On the basis of the hydrographic and current measurements,
an anticyclonic eddy was found in the intermediate layer, i.e., about 26.8–27.3σθ, 500–900 m. It captures part of the SCS Intermediate Water outflow in the northern Luzon Strait, and carries it to flow southward
and then westward back into the SCS in the southern Luzon Strait, with volume transport of about 1.9 × 106 m3 s−1. The simulated results from Hybrid Coordinate Ocean Model also suggest the existence of this anticyclonic eddy that develops
and lingers for a month long. 相似文献
3.
吕宋海峡纬向海流及质量输送 总被引：30，自引：6，他引：24
分析和计算了吕宋海峡PR21断面最近海洋调查的部分CTD资料和ADCP资料,再一次证明吕宋海峡常年存在纬向流。但对于天气尺度而言,该流型是多变的。根据高分辨率的海洋环流数值模式4a(1992～1996年)海平面高度(SSH)的输出值,运用地转关系估计了吕宋海峡纬向流的月平均值。研究表明;通过海峡流入、流出南海纬向流的深度一般达到500m左右,200m以上流速较大,平均流速为50cm/s,最大时达80cm/s以上。500m以下的纬向地转流流速较小,通常小于10cm/s.由大洋进入海峡的入流位置位于海峡的中部和南部,月平均入流最大值出现在11月,为50cm/s.位于海峡的北部和南部上层海洋的月平均出流,最大流速亦出现在11月,也为50cm/s,这与秋季北赤道流分叉位置最北(15°N),春季分叉位置最南(14°N)有关。上层流入、流出海峡的流量的月平均值分别约为10×106m3/s和5×106m3/s.当东北季风盛行时(从10月到翌年2月),流入海峡的流量远大于流出海峡的流量,两者的差可达8×106m3/s,而在其他季节两者的差仅为3×106m3/s.这说明东北季风盛行时,会有较多的水从南海南？ 相似文献
4.
Three dimensional diagnostic modeling study of the South China Sea circulation before onset of summer monsoon in 1998 总被引：1，自引：0，他引：1
The wind data from NCEP and hydrographic data obtained from April 22–May 24, 1998 have been used to compute the circulation
in the South China Sea (SCS) using three dimensional diagnostic models. The main numerical results with SSHA derived from
T/P altimeter are as follows: most of intruded Kuroshio bypasses. However, a part of Kuroshio intrudes westward above 300
m levels. This intruded westward flow is narrowly confined to the continental slope south of China, in agreement with the
findings of Qu et al. (2000). The basin-scale cyclonic gyre dominates in the northern SCS and consists of two cyclonic eddies, C2 and C3, above
300 m levels. However, it is separated into two parts by an anti-cyclonic eddy, W4, below 300 m. The basin-scale anti-cyclonic
gyre dominates in the central SCS and consists of three anti-cyclonic eddies, W1, W2 and W3, above 300 m levels. However,
below 300 m it consists of the anti-cyclonic eddies W1, W2 and W4 and extends northward to near 20°N. A northward coastal
jet is present near the coast of Vietnam at depths above 300 m, and develops northward further to about a distance of 3°15′
N than that in cruise 2. The most important dynamical mechanism is due to the joint effect of the baroclinity and relief.
The second dynamical mechanism is due to the interaction between the wind stress and relief. The topography effect is more
important than the β effect. The Sverdrup relation cannot be satisfied in the SCS. 相似文献
5.
本研究通过分析布放在南海北部的着陆器流速数据,研究一支蓝移的近惯性振荡信号,发现该信号可以传到600m水深以下,持续时间为11月3—16日。该信号的最大的东向流速为0.133m/s,最大南向流为0.124m/s。谱分析发现垂向流速呈现出5个不同的流核,最强流核发生在600—650m位置。近惯性能量下传速度为67±5m/d,从600m下传到1000m的位置能量耗散18%。经验正交函数(empiricalorthogonalfunction,EOF)分解结果显示,这次近惯性振荡信号开始是第一模态占主导,随后变成高阶模态为主导的形式。由于不知道其信号生成的源头,所以无法确定近惯性振荡形成原因,结合前人的研究结果,可以排除台风引起此次近惯性振荡信号的生成。卫星的海表高度异常显示,此时的正涡度有利于此次近惯性振荡发生蓝移特征。 相似文献
6.
2009-2010年冬季南海东北部中尺度过程观测 总被引：2，自引：1，他引：1
根据南海北部陆架陆坡海域2009-2010年冬季航次的CTD调查资料,发现西北太平洋水在上层通过吕宋海峡入侵南海,其对南海东北部上层水体温盐性质的影响自东向西呈减弱趋势,影响范围可达114°E附近。入侵过程中受东北部海域反 气旋式涡旋(观测期间,其中心位于20.75°N,118°E附近) 的影响,海水的垂向和水平结构发生了很大变化,特别是涡旋中心区域,上层暖水深厚,混合层和盐度极大值层显著深于周边海域。该暖涡在地转流场、航载ADCP观测海流及卫星高度计资料中均得到了证实。暖涡的存在还显著影响了海水化学要素的空间分布,暖涡引起的海水辐聚将上层溶解氧含量较高的水体向下输运,使次表层的暖涡中心呈现高溶解氧的分布特征。 相似文献
7.
南海中尺度涡的时空变化规律Ⅰ.统计特征分析 总被引：4，自引：3，他引：4
利用TOPEX/Poseidon混合ERS1/2高度计资料对1993～2002年间南海中尺度涡进行辨认和动态追踪,并对其时空变化规律进行统计分析,结果表明:南海平均每年出现18个涡旋,出现数量的年际变化与El Niño/La Niña有一定关系.多数涡旋的生命周期在180 d以内,近半数为30～60 d;半径大致在100 km到250 km间,其经向变化与斜压罗斯贝变形半径的经向变化趋势一致;80%的涡旋向西移动,纬向移速大致为在-8 cm/s到3 cm/s间,随纬度变化呈“∑”型分布.涡旋发生的区域主要位于越南南部以东至台湾西南一线海域,呈东北-西南向分布,其中,吕宋海峡以西海域和越南南部以东海域涡旋的出现概率相对较大,约为23%和25%,是涡旋的高发区.涡旋的存在对水深大于200 m海域的海面高度变化的平均贡献约为36%,在涡旋高发区的贡献高达80%.从涡旋出现地点、传播路径和速度、出现概率及对海面高度变化的贡献综合来看,涡旋大体可以沿17°N分成南北两个相对独立系统,一般不会有涡旋跨系统传播. 相似文献
8.
On the basis of hydrographic data obtained from 28 November to 27 December, 1998, the three-dimensional structure of circulation
in the South China Sea (SCS) is computed using a three-dimensional diagnostic model. The combination of sea surface height
anomaly from altimeter data and numerical results provides a consistent circulation pattern for the SCS, and main circulation
features can be summarized as follows: in the northern SCS there are a cold and cyclonic circulation C1 with two cores C1-1
and C1-2 northwest of Luzon and an anticyclonic eddy (W1) near Dongsha Islands. In the central SCS there is a stronger cyclonic
circulation C2 with two cores C2-1 and C2-2 east of Vietnam and a weaker anticyclonic eddy W2 northwest of Palawan Island.
A stronger coastal southward jet presents west of the eddy C2 and turns to the southeast in the region southwest of eddy C2-2,
and it then turns to flow eastward in the region south of eddy C2-2. In the southern SCS there are a weak cyclonic eddy C3
northwest of Borneo and an anti-cyclonic circulation W3 in the subsurface layer. The net westward volume transport through
section CD at 119.125°E from 18.975° to 21.725°N is about 10.3 × 106 m3s−1 in the layer above 400 m level. The most important dynamic mechanism generating the circulation in the SCS is a joint effect
of the baroclinicity and relief (JEBAR), and the second dynamical mechanism is an interaction between the wind stress and
relief (IBWSR). The strong upwelling occurs off northwest Luzon. 相似文献
9.
The surface circulation in the western equatorial Pacific Ocean is investigated with the aim of describing intra-annual variations
near Palau (134°30′ E, 7°30′ N). In situ data and model output from the Ocean Surface Currents Analysis—Real-time, TRIangle Trans-Ocean buoy Network, Naval Research
Laboratory Layered Ocean Model and the Joint Archive for Shipboard ADCP are examined and compared. Known major currents and
eddies of the western equatorial Pacific are observed and discussed, and previously undocumented features are identified and
named (Palau Eddy, Caroline Eddy, Micronesian Eddy). The circulation at Palau follows a seasonal variation aligned with that
of the Asian monsoon (December–April; July–October) and is driven by the major circulation features. From December to April,
currents around Palau are generally directed northward with speeds of approximately 20 cm/s, influenced by the North Equatorial
Counter-Current and the Mindanao Eddy. The current direction turns slightly clockwise through this boreal winter period, due
to the northern migration of the Mindanao Eddy. During April–May, the current west of Palau is reduced to 15 cm/s as the Mindanao
Eddy weakens. East of Palau, a cyclonic eddy (Palau Eddy) forms producing southward flow of around 25 cm/s. The flow during
the period July to September is disordered with no influence from major circulation features. The current is generally northward
west of Palau and southward to the east, each with speeds on the order of 5 cm/s. During October, as the Palau Eddy reforms,
the southward current to the east of Palau increases to 15 cm/s. During November, the circulation transitions to the north-directed
winter regime. 相似文献
10.
A coastal atmosphere-ocean coupled system (CAOCS) is developed with Princeton Ocean Model (POM) as the oceanic component, and with National Center for Atmospheric Research (NCAR) regional climate model (RegCM2) as the atmospheric component. The model domain (98.84°–121.16°E, 3.06°S–25.07°N) covers the whole SCS and surrounding land and islands. The surface fluxes of water, heat (excluding solar radiation), and momentum are applied synchronously with opposite signs in the atmosphere and ocean. Flux adjustments are not used. The CAOCS model was verified using an intensive airborne expendable bathythermograph (AXBT) survey between 14–25 May 1995 over the majority of the SCS down to about 300-m depth. 相似文献
11.
The origins and evolutions of two anticyclonic eddies in the northeastern South China Sea (SCS) were examined using multi-satellite
remote sensing data, trajectory data of surface drifting buoys, and in-situ hydrographic data during winter 2003/2004. The results showed that buoy 22918 tracked an anti-cyclonic warm-core eddy (AE1)
for about 20 days (December 4–23, 2003) in the northeastern SCS, and then escaped from AE1 eventually. Subsequently to that,
buoy 22517 remained within a different anti-cyclonic warm-core eddy (AE2) for about 78 days (from January 28 to April 14,
2004) in the same area. It drifted southwestward for about 540 km, and finally entered into the so-called “Luzon Gyre”. Using
inference from sea level anomaly (SLA), sea surface temperature (SST), geostrophic currents and the buoys’ trajectories, it
is shown that both eddies propagated southwestward along the continental slope of the northern SCS. The mean speeds of AE1
and AE2 movements were 9.7 cm/s and 10.5 cm/s, respectively, which are similar to the phase speed of Rossby waves in the northern
SCS. The variation of instantaneous speeds of the eddy movement and intensity of anticyclonic eddy may suggest complex interactions
between an anticyclonic eddy and its ambient fluids in the northern SCS, where the eddy propagated southwestward with Rossby
waves. Furthermore, SLA and SST images in combination with the temperature and salinity profiles obtained during a cruise
suggested that AE1 was generated in the interior SCS and AE2 was shed from the “Kuroshio meander”. 相似文献
12.
In this study, we develop a variable-grid global ocean general circulation model(OGCM) with a fine grid(1/6)°covering the area from 20°S–50°N and from 99°–150°E, and use the model to investigate the isopycnal surface circulation in the South China Sea(SCS). The simulated results show four layer structures in vertical: the surface and subsurface circulation of the SCS are characterized by the monsoon driven circulation, with basin-scaled cyclonic gyre in winter and anti-cyclonic gyre in summer. The intermediate layer circulation is opposite to the upper layer, showing anti-cyclonic gyre in winter but cyclonic gyre in summer. The circulation in the deep layer is much weaker in spring and summer, with the maximum velocity speed below 0.6 cm/s. In fall and winter, the SCS deep layer circulation shows strong east boundary current along the west coast of Philippine with the velocity speed at 1.5 m/s, which flows southward in fall and northward in winter. The results have also revealed a fourlayer vertical structure of water exchange through the Luzon Strait. The dynamics of the intermediate and deep circulation are attributed to the monsoon driving and the Luzon Strait transport forcing. 相似文献
13.
利用被动示踪物模拟对黑潮入侵南海的数值研究 总被引：1，自引：1，他引：0
由于缺少观测数据和对黑潮水准确定义,很难识别出从太平洋入侵到南海的黑潮水团。本文基于一个经过观测验证的三维模式MITgcm,利用被动示踪物标记黑潮水,研究了入侵南海的黑潮水的时空变化。研究表明,在冬季,黑潮水入侵的范围最广,几乎占据了18°N-23°N和114°E-121°E的区域;并有一个分支进入台湾海峡;黑潮入侵的范围随深度增加逐渐减小。在夏季,黑潮水被限制在118°E以东,且没有分支进入台湾海峡;入侵的范围从海面到约205米是增大的,之后随深度增加逐渐减小。通过分析从2003年到2012年黑潮入侵的年际变化,与厄尔尼诺年和正常年相比,冬季黑潮入侵后向台湾海峡的分支在拉尼娜年是最弱的,这可能与中国大陆东南方向的风应力旋度有关。通过吕宋海峡的黑潮入侵通量（KIT）是西向的,其年平均值约为-3.86×106 m3/s,大于吕宋海峡通量（LST,约-3.15×106 m3/s）。250米以上的KIT约占了全深度通量的60-80%。此外,从2003年到2012年KIT与Niño 3.4指数的相关系数到达0.41,小于LST与Niño 3.4指数的相关系数0.78。 相似文献
14.
为了了解潮流从西北太平洋经吕宋海峡进入南海内的变化及其垂向结构,本文利用在吕宋海峡附近沿东西方向布放的多套潜标同步获得的高分辨率ADCP长时间连续观测上层海流资料,使用调和分析方法将实测海流分解成3部分:不随时间变化的定常流、周期性潮流和剩余流,并将潮流分解为正压潮流和斜压潮流。通过对实测海流中各组分的分析,得到以下结论:该区域潮流类型在不同深度上有明显变化;M2潮自吕宋海峡传入南海后强度显著减弱75%左右,K1、O1分潮在上层强度减弱约三分之一。从垂向变化来看,在潮流强度上,各站点垂直方向上潮流强度均发生变化。从方向上看,各分潮潮流椭圆东西向特征明显,长轴变化较大,短轴(南北向特征)垂向变化不显著;潮流运动主要沿逆时针方向,垂直方向上潮流明显减弱或增强时会发生转向。斜压潮流主要集中在上表层,100m左右以下随深度逐渐减弱。东西方向斜压潮流能量比正压潮流强,而南北向的流比较稳定,且斜压潮流能量远小于正压潮流。定常流强度在各站点呈现相似的变化趋势,随深度变化减弱。 相似文献
15.
2002年春季吕宋海峡海流:观测与改进逆模式计算 总被引：10，自引：1，他引：9
基于2002年春季航次在吕宋海峡海域锚碇测流站(20°49'57"N,120°48'12"E)200,500与800m处锚碇测流以及CTD观测,采用改进逆方法对调查海域进行海流计算.(1)主要观测的结果:1)在200m处,观测期间海流平均速度为(47.4cm/s,346°).在500m处,海流观测期间平均速度为(20.3cm/s,350°).这些都表明黑潮在吕宋海峡锚碇测流站200和500m处向西北方向入侵南海.2)在800m处,海流观测期间平均速度为(1.2cm/s,35°),它的方向为东北向.比较每层实测流结果,表明800m层海流状况与200和500m层流况不同.3)在观测期间,200,500和800m处,日平均流速在4月皆比3月时要强.4)在调查海区西部的中间区域存在一个高密、冷水中心(HDCW),其中心位置位于断面A的水文站3附近.5)在调查海区东南区域存在一个低密、暖水(LDWW)中心,其中心位置位于断面B的水文站8附近.(2)主要计算结果:1)通过断面B的偏北方向与偏南方向的流量分别为32.48×106m3/s(包括反气旋涡的流量)与3.34×106m3/s.因此通过断面B的净北向流量为29.14×106m3/s.2)通过断面A的东向与西向的流量分别为16.71×106m3/s与8.57×106m3/s(包括气旋涡的流量).因此,通过断面A的净东向流量为8.14×106m3/s.3)通过断面M北向的净流量为24.68×106m3/s.4)黑潮通过断面M后分为主流和一个支流,其主流,流量为16.54×106m3/s,流向断面C的东部分.主流通过断面C的东部分后,最后流向台湾以东海域.而其一个分支,净流量为8.14×106m3/s,在一个高密、冷水中心(HDCW)的区域以东作气旋式弯曲,然后向西北方向通过断面C的西部.因此,黑潮在断面C有两个流核.5)比较计算得到的在锚碇测流站M附近流方向与在200与500m处观测流方向为西北向,它们甚为一致.6)在断面B西侧位于550m以深水层南海水可能缓慢地从西北流向东南,通过断面B的南向流量大约为3.34×106m3/s. 相似文献
16.
A marine magnetic survey was carried out in and around the northern part of Socotra Basin, offshore Korea (31°42′32″–32°46′29″N
and 123°56′26″–125°49′16″E), in order to better delineate its northern and eastern boundaries. Analyses of the observed magnetic
field and estimation of the basement depth were used to assess these boundaries. The power spectrum and the three-dimensional
analytical signal methods were used for depth estimation and to reconstruct basement configuration. Estimated depths resulting
from the power spectrum method range from 1.5 to 6.0 km for deep sources (basement troughs), and from 0.3 to 1.7 km for shallower
sources (basement peaks). An isopach map shows that the sedimentary sequence varies from 1.4 to 6.0 km in thickness. Estimated
depths from the analytic signal method fluctuate in the range 1.2–6 km. The results of the observed field analysis and depth
estimation indicate good agreement with the formerly proposed eastern boundary but disagreement with the northern boundary.
The findings suggest either an extension of the Socotra Basin or the existence of other sub-basins possibly interconnected
with the study area. 相似文献
17.
2002年春季吕宋海峡海流观测及其谱分析 总被引：1，自引：0，他引：1
基于2002年春季航次在吕宋海峡海域锚碇测流站(20°49'57"N,120°48'12"E)200,500与800m锚碇测流水层观测流,进行的海流特征分析与最大熵方法谱分析,得到以下主要结果.(1)在200m处,观测期间海流平均速度为(47.4cm/s,346°),最大观测海流速度Vmax和最大日平均海流速度Vd,max分别为(103.8cm/s,10°)和(71.6cm/s,339°);在500m处,观测期间平均流速为(20.3cm/s,350°),最大观测海流速度Vmax和最大日平均海流速度Vd,max分别为(74.1cm/s,17°)和(39.1cm/s,317°).这些都表明黑潮在吕宋海峡锚碇测流站200和500m处向西北方向入侵南海.(2)在800m处,观测期间平均流速为(1.2cm/s,35°),最大观测海流速度Vmax和最大日平均海流速度Vd,max分别为(10.8cm/s,76°)和(4.7cm/s,46°).这些都表明,它们的流向皆为东北向.比较在每层实测流的结果,表明在800m层海流状况与200和500m层海流状况是不相同的,流速随深度变深明显减弱,流向向右偏转.(3)在观测期间200,500和800m处,日平均流速在4月皆比3月时要强.(4)在200～800m潮流随深度变深有所变化,除了在500m处f<0情况全日潮峰值高于半日潮峰值以及对于半日潮以逆时针方向为主以外,其余情况在200～800m水层半日潮峰值都要高于全日潮的峰值,并且皆以顺时针方向旋转为主.(5)在200～800m水层都存在15d以上或14d左右的周期振动,例如在逆时针方向分量谱(f>0)在200,500m处存在19d左右的周期振动;在800m处存在14d左右的周期振动(f<0).(6)在200～800m处都存在4～6d周期天气过程的振动和2～3d周期振动.还都存在34.5h左右惯性振动周期,它的振动方向为顺时针方向.(7)通过交叉谱的计算,揭示:1)200与500m层两组流速时间序列对于半日潮周期、全日潮周期、15d以上的周期振动、2～3d的周期振动等都有很好的相关性,且对15d以上的长周期振动几乎是同步的;2)500与800m层两组流速时间序列对于4～6d天气过程的周期振动与2～3d的周期振动等都有很好的相关性,但它们之间有相位差,有滞后或提前现象. 相似文献
18.
Effects of cold eddy on phytoplankton production and assemblages in Luzon strait bordering the South China Sea 总被引：6，自引：0，他引：6
Yuh-Ling Lee Chen Houng-Yung Chen I. -I. Lin Ming-An Lee Jeng Chang 《Journal of Oceanography》2007,63(4):671-683
The biochemical effects of a cold-core eddy that was shed from the Kuroshio Current at the Luzon Strait bordering the South
China Sea (SCS) were studied in late spring, a relatively unproductive season in the SCS. The extent of the eddy was determined
by time-series images of SeaWiFS ocean color, AVHRR sea surface temperature, and TOPEX/Jason-1 sea surface height anomaly.
Nutrient budgets, nitrate-based new production, primary production, and phytoplankton assemblages were compared between the
eddy and its surrounding Kuroshio and SCS waters. The enhanced productivity in the eddy was comparable to wintertime productivity
in the SCS basin, which is supported by upwelled subsurface nitrate under the prevailing Northeastern Monsoon. There were
more Synechococcus, pico-eucaryotes, and diatoms, but less Trichodesmium in the surface water inside the eddy than outside. Prochlorococcus and Richelia intracellularis showed no spatial differences. Water column-integrated primary production (IPP) inside the eddy was 2–3 times that outside
the eddy in the SCS (1.09 vs. 0.59 g C m−2d−1), as was nitrate-based new production (INP) (0.67 vs. 0.25 g C m−2d−1). INP in the eddy was 6 times that in the Kuroshio (0.12 g C m−2d−1). IPP and INP in the eddy were higher than the maximum production values ever measured in the SCS basin. Surface chlorophyll
a concentration (0.40 mg m−3) in the eddy equaled the maximum concentration registered for the SCS basin and was higher than the wintertime average (0.29
± 0.04 mg m−3). INP was 3.5 times as great and IPP was doubled in the eddy compared to the wintertime SCS basin. As cold core eddies form
intermittently all year round as the Kuroshio invades the SCS, their effects on phytoplankton productivity and assemblages
are likely to have important influences on the biogeochemical cycle of the region. 相似文献
19.
On the basis of hydrographic data obtained from 12 June to 6 July, 1998, the three-dimensional structure of circulation in
the South China Sea (SCS) is computed using a three-dimensional diagnostic model. The combination of sea surface height anomaly
from altimeter data and numerical results provides a consistent circulation pattern for the SCS, and the main circulation
features can be summarized as follows: In the northern SCS there are a cyclonic eddy C1 near Dongsha Islands and an anti-cyclonic
eddy W1 west of Luzon Island. In the central SCS a strong anti-cyclonic eddy W3 and a cyclonic eddy C3 compose a quasi-dipole
southeast of Vietnam. A coastal northward jet is present at the western boundary near the Vietnam coast above 300 m level.
This northward coastal jet flows northward and turns eastward at about 14°N, and then flows southeastward into the area between
eddies W3 and C3. In the southern SCS the current is weaker. The most important dynamic mechanism underlying the circulation
in the SCS is the joint effect of the baroclinicity and relief (JEBAR), and the second dynamical mechanism is the interaction
between the wind stress and relief (IBWSR). Comparison of the characters of circulation in the SCS during summer 2000 with
that during summer 1998 reveals no obvious variability of the main characteristics. 相似文献
20.
使用细尺度参数化方法和2015—2019年全球的Argo温盐剖面资料,分析了风生近惯性能通量和地形粗糙度对全球海洋300—600m深度的涡流扩散系数的影响。结果表明,在30°—45°N区域,月均涡流扩散系数与月平均风生近惯性能通量随时间的变化趋势较为一致,相关系数可达0.43,前者滞后1个月,与后者的相关系数可达0.65,但在其他区域二者的变化趋势相差较大;相较于中纬度和北半球,低纬度和南半球的地形粗糙度与扩散系数的相关关系更好。基于这些分析结果,拟合并建立了30°—45°N区域300—600m深度的涡流扩散系数与风生近惯性能通量和地形粗糙度的关系式。而且,用此关系式和细尺度参数化方法计算出来的扩散系数平均量级差异为0.47,且91%的值偏差小于一个量级。据此,我们给出了1—12月30°—45°N太平洋区域的涡流扩散系数的网格化结果。 相似文献