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1.
The current elements of the Kuroshio in the East China Sea are analysed and discussed using the temperature-salinity and GEK data of the PN section obtained during 1972-1983. The calculations have proved (i) that the 12-year's mean volume transport of the Kuroshio at PN in the 0-800 m layer is about 20×106m3/s; (ii) that the mean volume transport has seasonal variations, i. e. slightly stronger in spring and summer than in the other seasons; and (iii) that the period of high-volume transport thereof corresponds to the appearance of a meander of the Kuroshio south of Japan. It is also discovered that this Kuroshio meander usually appears after a sharp increase in such volume transport. Finally, the differences of the Kuroshio volume transport between the PN, E and Suao-Yonakuni-jima sections are discussed. 相似文献
2.
带鱼(Trichiurrs haumela)在东海的渔获量占全国带鱼渔获量的90%,因而搞清东海区带鱼年渔获量的变化规律,对合理利用东海区的带鱼资源和指导当前该海区近海捕捞生产具有重要的意义。作者根据近几年来的生产实践和有关资料,试对东海区近海带鱼年渔获量的变化与该海区的水文关系,提出一些粗浅的看法。 相似文献
3.
源地黑潮及其上下游流量的变化特征 总被引：3，自引：1，他引：2
本文基于长时间序列的海流和温盐资料（最新版SODA高分辩率再分析资料和137°E断面的观测资料），计算了黑潮流系四个主要断面的流量，并分析了它们的变化特征．结果表明，黑潮流系各主要断面流量具有显著的季节性差异，其年际、年代际变化明显．相关分析表明，源地黑潮及其上下游流量变化具有较强的独立性，变化不尽一致，其中，短期气候变化特征可能与热带太平洋的年际变化有明显关联，而年代际变化则可能与发生于北太平洋的年代际变化以及其它副热带中尺度涡旋等变化有一定联系． 相似文献
4.
自北赤道流延伸而来的黑潮，起源于我国台湾省的东南海域。当黑潮沿着台湾岛东岸北上时，它的主轴通过苏澳-与那国岛断面，自北太平洋进入我国东海，成为我国东、黄海海流系统的“大动脉”。显然，黑潮的流速结构及其变化，对东、黄海水文特征的分布、变化以及我国东部沿海地区的气候，特别是旱涝现象，都有着密切的关系。所以，有关这一问题的探讨是很有意义的。而欲研究黑潮的上述问题，取苏澳-与那国岛断面作为探讨的核心是很合适的，因为这个断面不仅离黑潮源地较近，而且位于黑潮进入东海首当其冲的关键性区域。
关于黑潮在这一断面上海洋水文状态的变化情况，日本学者须田晥次(K.Suda,1937-1938)曾作过广泛的研究，他主要分析了黑潮源地区域标量场(温、盐、密度等)的逐月变化特征。本文拟引用须田当年所列举的温、盐度资料，来研究黑潮的流速结构(主要是流速分布和输送量)及其季节变化，并结合现有的海面风应力资料，试图对黑潮输送量的季节变化及其原因作一初步的探讨，并作为进一步研究黑潮变动规律的参考。 相似文献
5.
Interannual Variations of Sea Level at the Nansei Islands and Volume Transport of the Kuroshio Due to Wind Changes 总被引：4，自引：0，他引：4
Masaki Kawabe 《Journal of Oceanography》2001,57(2):189-205
Interannual variations of sea level at the Nansei Islands and volume transport of the Kuroshio during 1967–95 are calculated by integrating variations carried by windforced Rossby waves. Effects of eddy dissipation and ocean ridges are considered. Ridge effect is inferred by comparing between the calculated and observed sea levels. The calculation is satisfactory to sea levels and Kuroshio transport for the whole period. They are mostly caused by Rossby waves forced by wind and modified by the ridges, and are due to barotropic wave primarily and the first baroclinic wave secondly. The calculated Kuroshio transport well represents variations of several-year scales with maximums in respective duration of the large meander (LM) of the Kuroshio, as well as bi-decadal variation that transport was small during the non-LM period of 1967–75 and large during the LM-dominant period of 1975–91. Mean volume transport of the subtropical gyre is estimated at 57 Sv (1 Sv = 106 m3s–1) and divided by the Nansei Shoto Ridge into those of the Kuroshio in the East China Sea (25.5 Sv) and a subsurface current east of this ridge (31.5 Sv). The Subtropical Countercurrent and a southward deep current east of the Izu-Ogasawara Ridge are estimated at 16 Sv and 7 Sv, respectively. The calculated transports of the Kuroshio and other subtropical currents reach maximums at every El Niño event due to strong excitement of upwelling barotropic Rossby wave. 相似文献
6.
黑潮是北太平洋副热带环流系统的一支重要的西边界流。前人对不同流段黑潮的季节和年际变化进行了诸多研究,然而基于不同数据所得结论仍存在差异,尤其是不同模式计算所得流量差别很大,而且以往研究往往着眼于某一流段,对不同流段黑潮变化之间的异同及其原因涉及较少。本文基于卫星高度计数据,评估了OFES(Ocean generalcir culation model For the Earth Simulator)和HYCOM(Hybrid Coordinate Ocean Model)两个模式对吕宋岛和台湾岛以东黑潮季节与年际变化的模拟能力,进而对两个海域黑潮变化的异同及其物理机制进行了分析。结果表明:HYCOM模式对黑潮季节变化的模拟较好,而OFES模式对黑潮年际变化的模拟较好。吕宋岛以东黑潮和台湾岛以东黑潮在季节与年际尺度上的变化规律均不相同,且受不同动力过程控制。吕宋岛以东黑潮呈现冬春季强而秋季弱的变化规律,主要受北赤道流分叉南北移动的影响;而台湾岛以东黑潮呈现夏季强冬季弱的变化特点,主要受该海区反气旋涡与气旋涡相对数目的季节变化影响。在年际尺度上,吕宋岛以东黑潮与北赤道流分叉及风应力旋度呈负相关,当风应力旋度超前于流量4个月时相关系数达到了-0.56;而台湾岛以东黑潮的流量变化则受制于副热带逆流区涡动能的变化,且滞后于涡动能9个月时达到最大正相关,相关系数为0.44。本研究对于深入理解不同流段黑潮的多尺度变异规律及其对邻近海区环流与气候的影响具有重要意义,同时对于黑潮研究的数值模式选取具有重要参考价值。 相似文献
7.
On the basis of the analysis of the data obtained from five cruises of the R/V Xiangyanghong 09 and the data from Japan, it is shown that a large meander of the Kuroshio appeared again during 1986-1988. The processes of formation , maturity and decline of this large meander are discussed in this study. The variation of the volume transport at Section Kb (PN) in the East China Sea is related to the large meander of the Kuroshio in the area south of Japan. By using maximum entropy spectrum analysis,the volume transport of the Kuroshio and the swing of its axis are analysed and their major periods are obained. 相似文献
8.
为了研究黑潮跨过200m等深线对东海入侵的年际变化特征,本文基于ROMS(Regional Ocean Modeling System)海洋模式,对西北太平洋海域进行了高分辨率的数值模拟,模式水平分辨率高达4km,该分辨率可以很好地分辨黑潮以东区域的中尺度涡旋等过程。模式首先进行了6年的气候态模拟,然后进行了1993到2015年的后报模拟。模式很好地再现了东海陆架已知的环流结构,模拟出的对马海峡和台湾海峡的年平均流量和观测结果也比较一致。基于模式结果,利用旋转经验正交函数(REOF)的方法,对黑潮跨过200m等深线流量的年际变化进行分析。REOF的主要模态表明,黑潮跨过200m等深线对东海陆架的入侵主要发生台湾东北,并且入侵主要集中在黑潮次表层水中。主要模态的时间系数表明,黑潮入侵东海陆架的年平均流量存在一个8年的变化周期。相关性分析表明,黑潮入侵东海陆架的年际变化和太平洋年代际振荡PDO(Pacific Decadal Oscillation)指标具有显著的负相关,其相关系数达–0.63。该相关可以通过如下过程解释:PDO会导致东太平洋风应力涡度异常,由Sverdrup关系可知向赤道的体积输运也会相应地产生异常,根据质量守恒,向赤道体积输运的异常必然通过西边界流-黑潮的异常来平衡,从而导致黑潮入侵东海陆架强烈的年际变化。 相似文献
9.
Volume transports proceeding to the Kuroshio Extension region and recirculating in the Shikoku Basin 总被引：4，自引：1，他引：3
Akira Nagano Kaoru Ichikawa Hiroshi Ichikawa Masanori Konda Kiyoshi Murakami 《Journal of Oceanography》2013,69(3):285-293
The volume transport of the Kuroshio, the western boundary current of the North Pacific subtropical gyre, varies vigorously due to merging of disturbances propagating from the entire North Pacific. Taking into account the recirculation in the Shikoku Basin by the zonal observation line at 30°N to the west of the Izu–Ogasawara Ridge, we estimated the volume transport in the top 1,000 m layer toward the Kuroshio Extension region. The volume transport of the local recirculation gyre in the Shikoku Basin increases associated with the westward extension of the gyre, particularly in the period of the large meandering path of the Kuroshio south of Japan. Meanwhile, most of the transport variations toward the Kuroshio Extension region correspond to those of the Kuroshio transport on the continental slope south of Japan, which vary independently of those of the recirculation gyre. 相似文献
10.
This paper analyses the sea surface temperature (SST) of the eastern Pacific Ocean, the Kuroshio in the East China Sea, the subtropical high pressure of the Pacific Ocean and the precipitation for rainy season of Qingdao. We obtain a result that if this year the eastern Pacific Equatorial Zone is a warm-water year, the Kuroshio path in the East China Sea for next year will be subject to oscillation westward. The SST of the eastern Pacific Ocean may predict precipitation for rainy season of Qingdao one year earlier than that of the Kuroshio in the East China Sea. 相似文献
11.
Kunio Kutsuwada 《Journal of Oceanography》1988,44(2):68-80
Relationships of the sea level differences between Naze and Nishinoomote and between Kushimoto and Uragami with wind stress over the North Pacific are examined for interannual variability. These sea level differences are considered to be indications of Kuroshio transport in Tokara Strait and Kuroshio path south of Enshu-nada, respectively. In the sea level difference between Kushimoto and Uragami, dominant variations are found to have periods of about seven years and 3–4 years. The variation of about 7-year period, which corresponds to that in the Kuroshio path between the large meander and non-large meander, is coherent with the variation of the wind stress curl in a region about 2,400 km east of the Kii Peninsula, where negative stress curl weakens about two years before the sea level difference drops (i.e. the large meander path in the Kuroshio generates). The variation of the 3–4 year period is coherent with that of the wind stress in a large area covering the eastern equatorial Pacific, which suggests that it links with global-scale atmospheric variations. Interannual variation in sea level difference between Naze and Nishinoomote is not coherent with that between Kushimoto and Uragami, which suggests that it is not related to the variation of the Kuroshio path south of Enshu-nada, but is coherent with that of the zonally-integrated Sverdrup transport in the latitudinal zone along 30°N. It is suggested that the interannual variation of the Kuroshio transport in Tokara Strait can be explained by the barotropic response to the wind stress. 相似文献
12.
13.
利用一个太平洋区域分辨率为12.5 km的ROMS-CoSiNE海洋物理-生态耦合模式1997-2016年的积分结果,对东海黑潮硝酸盐输送的年际变化进行分析。结果显示:东海黑潮的硝酸盐输送存在约3 a与7 a的年际变化周期,且在100~400 m深的次表层与400~800 m深的中层水中变化较为显著。东海黑潮上游海水中,南海水及直接汇入东海黑潮的西太平洋海水对黑潮硝酸盐的年际输送变化具有重要影响。其中,南海水主要影响东海黑潮中层水的硝酸盐输送,而西太平洋海水对东海黑潮次表层水硝酸盐的输送影响较为显著。 相似文献
14.
庆良间水道水交换对其上下游东海黑潮的流量和水团特性的变异都起到了非常重要的作用,本文通过将历史观测的WOD资料插值为1/8°×1/8°的网格化数据,估算了庆良间水道的地转流通量特征,然后结合Argo浮标数据讨论了庆良间水道的水交换对东海黑潮水团特性的影响,研究结果表明:(1)西太平洋通过庆良间水道流入东海冲绳海槽主要发生在水道的次表层,并且次表层的入侵可能跟庆良间水道东部的琉球流有关;(2)庆良间水道上下游黑潮的水团特性由于受到来自庆良间水道的动力混合作用导致其存在差异。黑潮次表层高盐水到达冲绳附近之后盐度略微增加,深度略微变浅,然而黑潮中层低盐水的盐度显著减小,深度明显加深;(3)庆良间水道上下游东海黑潮的次表层高盐水和中层低盐水其盐度的季节变化规律不一致。次表层高盐水盐度的季节变化可能同时受到庆良间水道的流量和表层淡水通量的影响,在冬季最强,夏季最弱,然而中层低盐水盐度的季节变化主要受庆良间水道流量的影响,在秋季最强,夏季最弱。 相似文献
15.
To explore the causes of the winter shallow mixed layer and high sea surface temperature (SST) along the strong Kuroshio jet
from the East China Sea to the upstream Kuroshio extension (25.5°N–150°E) during 1988–1994 when the Japanese sardine stocks
collapsed, high-resolution ocean general circulation model (OGCM) hindcast data are analyzed with a bulk mixed layer model
which traces particles at the mixed layer base. The shallow mixed layer and high SST along the Kuroshio jet are mainly caused
by the acceleration of the Kuroshio current velocity and the reduction of the surface cooling. Because the acceleration reduces
the time during which the mixed layer is exposed to wintertime cooling, deepening and cooling of the winter mixed layer are
restricted. The weaker surface cooling due to less severe meteorological forcing also causes the shallow mixed layer and the
high SST. The impact of the strong heat transport along the Kuroshio extends to the southern recirculation gyre of the Kuroshio/Kuroshio
extension regions; previous indications that the Japanese sardine recruitment is correlated with the winter SST and the mixed
layer depth (MLD) in the Kuroshio extension recirculation region could be related to the velocity, SST, and MLD near the Kuroshio
axis which also could affect the variability of North Pacific subtropical water. 相似文献
16.
Long-Term Variability of North Pacific Subtropical Mode Water in Response to Spin-Up of the Subtropical Gyre 总被引：1，自引：0，他引：1
The Meteorological Research Institute's ocean general circulation model (MRI-OGCM) has been used to investigate the temperature
variability of the North Pacific Subtropical Mode Water (NPSTMW) over a time series longer than 5 years via the spin-up of
the subtropical gyre. Besides an interannual variation, the wintertime sea surface temperature in the area where the NPSTMW
is formed, and the temperature of the NPSTMW itself, both change remarkably in a >5-year time scale. An analysis of heat budgets
showed that the long-term changes in NPSTMW temperature are due mainly to a leading advection of heat by the Kuroshio Extension
and compensating surface heat flux. As a result of a dynamical adjustment to the wind stress fields, the transports of the
Kuroshio and the Kuroshio Extension increased in the mid 1970s with a lag of 3 years after the wind stress curl in the central
North Pacific. The increased heat advection by the Kuroshio Extension induces a warming in the mixed layer in the NPSTMW formation
area, followed by a warming of the NPSTMW itself. Both these warming actions increase the heat release to the atmosphere.
These results imply that the surface heat flux over the Kuroshio Extension area varies in response to the change in the ocean
circulation through the spin-up of the subtropical gyre.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
17.
吕宋海峡水交换季节和年际变化特征的数值模拟研究 总被引：1，自引：0，他引：1
利用ROMS(Regional Ocean Modeling System)建立了一套覆盖西北太平洋的涡尺度分辨率环流模型,并对吕宋海峡附近的环流进行了模拟研究。结果表明,吕宋海峡120.75°E断面净流量季节变化显著,全年均为西向输运,6月份达到最小,为0.40×106 m3/s,然后逐渐增大,在12月份达到最大,为6.14×106 m3/s,全年平均流量为3.04×106 m3/s。在500 m以浅,秋、冬季都有明显的黑潮流套存在,并伴有黑潮分支入侵南海,而春、夏季黑潮南海分支减弱或消失,黑潮入侵不明显。在500 m以深,冬、春季,吕宋海峡以东有非常明显的南向流存在,流速约10 cm/s,而到了夏、秋季该南向流出现明显的减弱,黑潮与南海的水交换主要通过吕宋海峡以北的吕宋海沟进行。在垂向结构上,120.75°E断面浅层呈多流核结构,并且流核的位置和强弱受黑潮的季节性变化影响显著,深层流的季节变化不大。在年际尺度方面,吕宋海峡年际体积输运量异常与Niño3.4滞后6个月相关系数达到41.6%,吕宋海峡水交换与ENSO现象有较为显著的正相关关系,并存在2~3 a和准8 a周期的年际变化。 相似文献
18.
Examined here is a hypothetical idea of the splitting of the subtropical gyre in the western North Pacific on the basis of two independent sources of data,i.e., the long-term mean geopotential-anomaly data compiled by the Japanese Oceanographic Data Center and the synoptic hydrographic (STD) data taken by the Hakuho Maru in the source region of the Kuroshio and the Subtropical Countercurrent in the period February and March 1974. Both of the synoptic and the long-term mean dynamic-topographic maps reveal three major ridges, which indicate that the western subtropical gyre is split into three subgyres. Each subgyre is made up of the pair of currents, the Kuroshio and the Kuroshio Countercurrent, the Subtropical Countercurrent and a westward flow lying just south of the Countercurrent (18°N–21°N), and the northern part of the North Fquatorial Current and an eastward flow at around 18°N. The subgyres are more or less composed of a train of anticyclonic eddies with meridional scales of between 300 and 600 km, so that the volume transport of the subgyres varies by a factor of two or more from section to section. The upper-water characteristics also support the splitting of the subtropical gyre; the water characteristics are fairly uniform within each subgyre, but markedly different between them. The northern rim of each subgyre appears as a sharp density front accompanied by an eastward flow. The bifurcations of the sharp density fronts across the western boundary current indicate that the major part of the surface waters in the North Equatorial Countercurrent is not brought into the Kuroshio. The western boundary current appears as a continuous feature of high speed, but the waters transported change discontinuously at some places. 相似文献
19.
In this paper, by making use of data from Cooperative Study of the Kurosio and Adjacent Reions (CSK) together with part of the Geomagnetic Electrokinetograph (GEK) surface current observation data, we analyse the E section in detail for the following contents:1. The variation characteristics of time and space in the current field of the Kuroshio.2. The current axis structures of the Kuroshio and its main axis shift to the right with depth. Some parameter indications of the hydrographical elements are presented.3. Comparison is made among the East of Taiwan Island, the Kuroshio in the East China Sea and the Kuroshio crossing the E section.4. The geostrophic transports are calculated and their variations are analysed. The great difference of vertical transport distribution between the warm half year and cold half year is specifically indicated.We think that this paper is of benefit to further studying the Kuroshio and to the exploitation and utilization of its resources. 相似文献
20.
东海黑潮热含量的计算和分析 总被引：2，自引：0，他引：2
黑潮对海洋和大气的影响已越来越受到海洋和气象工作者的重视。本文从海洋对大气热力影响方面对东海黑潮热含量作了计算和分析;表明,热含量的变化除受来自低纬海水输送量的多少影响外,还受EL NIO现象的影响。 一、资料的选取和计算G断面东起27°30′N、128°15′E,西迄 相似文献