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1.
The coastal sea level propagating westward along the south coast of Japan and the impact of the disturbance on the generation
of the Kuroshio small meander have been examined. The propagation occurs in sea level variations for periods shorter than
10 days and is remarkable for periods of 4–6 days. Characteristics of the 4–6 day component have been studied using the extended
empirical orthogonal function (EEOF). The first and second modes of EEOF are almost in-phase throughout the south coast of
Japan. The higher four modes of EEOF are significantly excited when the Kuroshio takes the non-large-meander path, and propagate
westward with phase speeds of 2.8 m s−1 (third and fourth modes) and 1.6 m s−1 (fifth and sixth modes) in the Kuroshio region west of Mera in the Boso Peninsula. The analysis shows that more than 70%
of the small meanders generate in two months after a significant propagating disturbance reaches south of Kyushu when the
velocity of the Kuroshio is high. This effect of coastal disturbance is examined by numerical experiments with a 2.5-layer
model in which coastal disturbance is excited by vertical displacement of the upper interface. The result is that offshore
displacement of the Kuroshio occurs southeast of Kyushu only in the case of significant upward displacement of the interface
under the influence of a high Kuroshio velocity. The significant coastal disturbance, which is associated with upward displacement
of the density interface, and a high Kuroshio velocity can therefore be important factors in generating small meanders. 相似文献
2.
The origin of the Ryukyu Current(RC) and the formation of its subsurface velocity core were investigated using a 23-year(1993–2015) global Hybrid Coordinate Ocean Model(HYCOM) dataset. The volume transport of the RC comes from the Kuroshio eastward branch(KEB) east of Taiwan and part of the North Pacific Subtropical Gyre(pNPSG). From the surface to 2 000 m depth, the KEB(p-NPSG) transport contributes 41.5%(58.5%) to the mean total RC transport. The KEB originally forms the subsurface velocity core of the RC east of Taiwan due to blockage of the subsurface Kuroshio by the Ilan Ridge(sill depth: 700 m). Above 700 m, the Kuroshio can enter the East China Sea(ECS) over the Ilan Ridge, meanwhile, the blocked Kuroshio below 700 m turns to the right and flows along the Ryukyu Islands. With the RC flowing northeastward, the p-NPSG contribution strengthens the subsurface maximum structure of the RC owing to the blockage of the Ryukyu Ridge. In the surface layer, the pNPSG cannot form a stable northeastward current due to frequent disturbance by mesoscale eddies and water exchange through the gaps(with net volume transport into ECS) between the Ryukyu Islands. 相似文献
3.
Hiroshi Ichikawa Hirohiko Nakamura Ayako Nishina Masataka Higashi 《Journal of Oceanography》2004,60(2):351-363
To better understand the mechanism underlying the variation of the Kuroshio south of central Japan, we have examined the variability
of current structure in its upstream region, southeast of Amami-Ohshima Island in the northern Ryukyu Islands. By combined
use of ship-mounted Acoustic Doppler Current Profiler (ADCP) and the TOPEX/POSEIDON satellite altimeter data on Path 214,
the sea surface absolute geostrophic currents were estimated every ten days from January 1998 to July 2002. The 4.5-year mean
surface current was found to flow northeastward north of 26.8°N with a maximum speed of 14 cm s−1 over the shelf slope at 3000 m depth. The moored current-meter observations at three or four mooring stations from Dec. 1998
to Oct. 2002 suggested the existence of a northeastward undercurrent with a maximum core velocity of 23 cm s−1 at 600 m depth over the shelf slope at 1600 m depth. The mean volume transport in the top 1500 m between 27.9°N and 26.7°N
is estimated to be 16 × 106 m3s−1 northeastward, including the subsurface core current related component of 4 × 106 m3s−1.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
In order to examine the formation, distribution and transport of North Pacific Intermediate Water (NPIW), repeated hydrographic
observations along several lines in the western North Pacific were carried out in the period from 1996 to 2001. NPIW formation
can be described as follows: (1) Oyashio water extends south of the Subarctic Boundary and meets Kuroshio water in intermediate
layers; (2) active mixing between Oyashio and Kuroshio waters occurs in intermediate layers; (3) the mixing of Oyashio and
Kuroshio waters and salinity minimum formation around the potential density of 26.8σθ proceed to the east. It is found that Kuroshio water flows eastward even in the region north of 40°N across the 165°E line,
showing that Kuroshio water extends north of the Subarctic Boundary. Volume transports of Oyashio and Kuroshio components
(relative to 2000 dbar) integrated in the potential density range of 26.6–27.4σθ along the Kuroshio Extension across 152°E–165°E
are estimated to be 7–8 Sv (106 m3s−1) and 9–10 Sv, respectively, which is consistent with recent work.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
5.
The Kuroshio East of Taiwan and in the East China Sea and the currents East of Ryukyu Islands during early summer of 1996 总被引:6,自引:0,他引:6
Yaochu Yuan Arata Kaneko Jilan Su Xiaohua Zhu Yonggang Liu Noriaki Gohda Hong Chen 《Journal of Oceanography》1998,54(3):217-226
Using hydrographic data and moored current meter records and the ADCP observed current data during May–June 1996, a modified
inverse method is applied to calculate the Kuroshio east of Taiwan and in the East China Sea and the currents east of Ryukyu
Islands. There are three branches of the Kuroshio east of Taiwan. The Kuroshio in the East China Sea comes from the main (first)
and second branches of the Kuroshio east of Taiwan. The easternmost (third) branch of the Kuroshio flows northeastward to
the region east of Ryukyu Islands. The net northward volume transports of the Kuroshio through Section K2 southeast of Taiwan and Section PN in the East China Sea are 44.4×106 and 27.2×106 m3s−1, respectively. The western boundary current east of Ryukyu Islands comes from the easternmost branch of the Kuroshio east
of Taiwan and an anticyclonic recirculating gyre more east, making volume transports of 10 to 15×106 m3s−1. At about 21°N, 127°E southeast of Taiwan, there is a cold eddy which causes branching of the Kuroshio there. 相似文献
6.
7.
The study of the Kuroshio in the East China Sea and the currents east of the Ryukyu Islands 总被引:3,自引:0,他引:3
In this study, the inverse method is used to compute the Kuroshio in the East China Sea and southeast of Kyushu and the currents east of the Ryukyu Islands, on the basis of hydrographic data obtained during September-October, 1987 by R/V Chofu Maru. The results show that: (1)A part of the Taiwan Warm Current has a tendency to converge to the shelf break; (2) the Kuroshio flows across the section C3 (PN) with a reduced current width, and the velocity of the Kuroshio at the section C3 increases and its maximum current speed is about 158 cm/s, and its volume transport here is about 26×106m3/s; (3) the Kuroshio has two current cores at the sections C3 (PN) and B2 (at the Tokara Strait); (4) the currents east of the Ryukyu Islands are found to flow northward over the Ryukyu Trench during September-October, 1987. The velocities of the currents are not strong throughout the depths. At the section C2 east of the Ryukyu Islands, the maximum current speed is at the 699 m levei and its magnitude is 25 cm/s, and i 相似文献
8.
Magdalena Andres Jae-Hun Park Mark Wimbush Xiao-Hua Zhu Kyung-Il Chang Hiroshi Ichikawa 《Journal of Oceanography》2008,64(6):937-950
Data from satellite altimeters and from a 13-month deployment of in situ instruments are used to determine an empirical relationship between sea-level anomaly difference (SLA) across the Kuroshio
in the East China Sea (ECS-Kuroshio) and net transport near 28°N. Applying this relationship to the altimeter data, we obtain
a 12-year time series of ECS-Kuroshio transport crossing the C-line (KT). The resulting mean transport is 18.7 ± 0.2 Sv with
1.8 Sv standard deviation. This KT is compared with a similarly-determined time series of net Ryukyu Current transport crossing
the O-line near 26°N southeast of Okinawa (RT). Their mean sum (24 Sv) is less than the mean predicted Sverdrup transport.
These KT and RT mean-flow estimates form a consistent pattern with historical estimates of other mean flows in the East China
Sea/Philippine Basin region. While mean KT is larger than mean RT by a factor of 3.5, the amplitude of the KT annual cycle
is only half that of RT. At the 95% confidence level the transports are coherent at periods of about 2 years and 100–200 days,
with RT leading KT by about 60 days in each case. At the annual period, the transports are coherent at the 90% confidence
level with KT leading RT by 4–5 months. While the bulk of the Kuroshio enters the ECS through the channel between Taiwan and
Yonaguni-jima, analysis of satellite altimetry maps, together with the transport time series, indicates that the effect of
mesoscale eddies is transmitted to the ECS via the Kerama Gap southwest of Okinawa. Once the effect of these eddies is felt
by the ECS-Kuroshio at 28°N, it is advected rapidly to the Tokara Strait. 相似文献
9.
Takanori Iwao Masahiro Endoh Nobuyuki Shikama Toshiya Nakano 《Journal of Oceanography》2003,59(6):893-904
In order to examine the formation, distribution and synoptic scale circulation structure of North Pacific Intermediate Water
(NPIW), 21 subsurface floats were deployed in the sea east of Japan. A Eulerian image of the intermediate layer (density range:
26.6–27.0σθ) circulation in the northwestern North Pacific was obtained by the combined analysis of the movements of the subsurface floats
in the period from May 1998 to November 2002 and historical hydrographic observations. The intermediate flow field derived
from the floats showed stronger flow speeds in general than that of geostrophic flow field calculated from historical hydrographic
observations. In the intermediate layer, 8 Sv (1 Sv ≡ 106 m3s−1) Oyashio and Kuroshio waters are found flowing into the sea east of Japan. Three strong eastward flows are seen in the region
from 150°E to 170°E, the first two flows are considered as the Subarctic Current and the Kuroshio Extension or the North Pacific
Current. Both volume transports are estimated as 5.5 Sv. The third one flows along the Subarctic Boundary with a volume transport
of 5 Sv. Water mass analysis indicates that the intermediate flow of the Subarctic Current consists of 4 Sv Oyashio water
and 1.5 Sv Kuroshio water. The intermediate North Pacific Current consists of 2 Sv Oyashio water and 3.5 Sv Kuroshio water.
The intermediate flow along the Subarctic Boundary contains 2 Sv Oyashio water and 3 Sv Kuroshio water.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Operational Data Assimilation System for the Kuroshio South of Japan: Reanalysis and Validation 总被引:3,自引:5,他引:3
Masafumi Kamachi Tsurane Kuragano Hiroshi Ichikawa Hirohiko Nakamura Ayako Nishina Atsuhiko Isobe Daisuke Ambe Masazumi Arai Noriaki Gohda Satoshi Sugimoto Kumi Yoshita Toshiyuki Sakurai Francesco Uboldi 《Journal of Oceanography》2004,60(2):303-312
We describe an operational ocean data assimilation system for the Kuroshio and its validation using a nine-year reanalysis
(historical run from 1993 to 2001) dataset of upper-ocean state estimation in the North Pacific. The horizontal structure
of volume transport of the Ryukyu Current System (RCS) is shown from the reanalysis: The RCS is connected to the flow of the
subtropical gyre, and its volume transport gradually increases from south-east of Okinawa (5–10 Sv) to the east of Amami-Ohshima
Island (20 Sv). Comparing the reanalysis with independent observations on the southeast slope of the Amami-Ohshima Island
indicates that the root mean square differences (RMSDs) are 0.076 (0.037) m/s in the period of December 1998 to November 1999
(November 1999 to November 2000) respectively. The reanalysis field has a bias (3.1 Sv) of the volume transport of the RCS
and the RMSD (3.5 Sv) which is larger than the observed variability (2.81 Sv). Surface velocity and the Kuroshio axis south
of Japan are also examined. Comparison of the reanalysis and ADCP data gave maximum RMSD of 0.749 (0.271) m/s in the strong
(weak) current regions, respectively. The annual mean value of the axis error is 19 km in 1998. The RMSD of the error is at
most 50 km, in 294 cases in the observation period, which is smaller than the observed root mean square variability of the
axis (64 km).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
11.
1995与1996年夏季琉球群岛两侧海流 总被引:7,自引:3,他引:4
基于1995,1996年夏季日本调查船的观测资料,采用P矢量方法对琉球群岛两侧的海流进行了计算.结果表明:黑潮为琉球群岛以西海域的一支东北向强流,1996年夏季的流速比1995年夏季的强,在深层出现南向逆流.黑潮东、西两侧分别存在一个反气旋式暖涡和一个弱的气旋式冷涡.1995年夏季,琉球群岛以东,从表层至以下层都存在一支沿岸北上的海流,即琉球海流.该海流来自黑潮分支,为本海区的一个主要物理特征.琉球海流以下出现弱的南向流.冲绳岛以东海域,在25°~25°30'N,128°30'~129°10'E附近从表层至700m水深存在一个中尺度的反气旋式暖涡.在温、盐水平分布图上,对应的出现一个较高温、低密水块.1996年夏季,冲绳岛西南海域存在一个中尺度的反气旋式暖涡和一个气旋式冷涡,形成一个偶极子,中间为较强的南向流,该现象为本海区的一个重要物理特征,属首次报道.冲绳岛以东表层主要被南向流控制,琉球海流不明显.200m以深在近岸出现北向流,这表明琉球海流的核心位于次表层.琉球海流的下面出现南向流.计算海区东北部从表层到700m水深出现一个中尺度的反气旋式暖涡,与1995年夏季时比较,其位置向北移动.此外在1996年夏季从近表层到深层,垂直方向和水平方向上的等温线、等盐线波动很大,例如在C断面上冷、暖涡相间出现,且暖 相似文献
12.
琉球群岛以东的西边界流与东海黑潮流量时空特征的研究 总被引:1,自引:1,他引:0
通过最新的高分辨率再分析海洋数据资料,对于东海黑潮以及琉球群岛以东海域的海流进行了研究。结果表明琉球群岛以东西边界流最大流速出现在600~1200 m深度的地形坡度最大处,大小约为0.2 m/s。由于冲绳岛以南庆良间水道的水交换对于东海黑潮流量有重要的影响,东海黑潮的平均流量从南向北逐渐递增,平均流量为28×106~35×106m3/s;琉球群岛以东的西边界流流量则比东海黑潮小一个量级,平均值小于其变化的方差;由于受庆良间水道海流的影响,冲绳岛东侧的流量要远小于奄美大岛东侧的流量。同一纬度大洋中西传的Rossby波对琉球群岛以东的西边界流有较大影响,因此琉球群岛以东西边界流的流量有大约100 d的显著变化周期。庆良间水道以南的东海黑潮由于主要受台湾以东黑潮流量的控制,也有大约100 d的显著变化周期,庆良间水道以北的东海黑潮则没有该特征。 相似文献
13.
Observations of the Kuroshio south of Taiwan have been carried out on a quarterly basis since late 1992 as part of the basin-wide
High Resolution expendable bathythermograph/expendable conductivity-temperature-depth (XBT/XCTD) network. Mean geostrophic
transport in the Kuroshio, 0–800 m, from 34 cruises is 22.0 Sv ± 1.5, consistent with previous results from moorings and geostrophic
calculations in the upstream Kuroshio region. The mean core of the current has speed about 90 cm s−1 and is located close to Taiwan. At this location the Kuroshio appears to be confined mainly to the upper 700 m, and there
is no evident tight recirculation of the current. Eddy variability is substantial, and large eddies can be seen propagating
westward for thousands of kilometers in TOPEX/Poseidon altimetric data, impinging on the current and altering its structure
and transport. The annual range in transport is about 8 Sv ± 6, with maximum in summer. Interannual variability is about 12
Sv ± 6, with transport maxima in 1995 and 2000 and a minimum in 1997–1998. Interannual variability in the upstream Kuroshio
may be uncorrelated with that in the downstream region south of Japan, where the transport is much greater. Our quarterly
sampling aliases high frequency variability of the current, and an improved boundary-current observation program would include
more frequent transects and occasional deeper measurements.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
14.
中国近海及其附近海域若干涡旋研究综述Ⅱ.东海和琉球群岛以东海域 总被引:2,自引:0,他引:2
综述东海和琉球群岛以东海域若干气旋型和反气旋型涡旋的研究.对东海陆架、200m以浅海域,主要讨论了东海西南部反气旋涡、济州岛西南气旋式涡和长江口东北气旋式冷涡.东海两侧和陆坡附近出现了各种不同尺度的涡旋,其动力原因之一是与东海黑潮弯曲现象有很大关系,其次也与地形、琉球群岛存在等有关.东海黑潮有两种类型弯曲:黑潮锋弯曲和黑潮路径弯曲.黑潮第一种弯曲出现了锋面涡旋,评述了锋面涡旋的存在时间尺度与空间尺度和结构等;也指出了黑潮第二种弯曲,即路径弯曲时在其两侧出现了中尺度气旋式和反气旋涡,讨论了它们的变化的特性.特别讨论了冲绳北段黑潮弯曲路径和中尺度涡的相互作用,着重指出,当气旋式涡在冲绳海槽北段成长,并充分地发展,其周期约在1~3个月时,它的空间尺度成长到约为200km(此尺度相当于冲绳海槽的纬向尺度)时,黑潮路径从北段转移到南段.也分析了东海黑潮流量和其附近中尺度涡的相互作用.最后指出在琉球群岛以东、以南海域,经常出现各种不同的中尺度反气旋式和气旋式涡,讨论了它们在时间与空间尺度上变化的特征. 相似文献
15.
Hirohiko Nakamura Ayako Nishina Kotaro Tabata Masataka Higashi Akimasa Habano Toru Yamashiro 《Journal of Oceanography》2012,68(2):321-336
A time series of surface geostrophic velocity is developed using satellite altimetry data during 1992–2010 for a track across
the Kuroshio southeast of Kyushu, Japan. The temporal mean geostrophic velocity is estimated by combining the along-track
sea level anomaly and shipboard ADCP data. This approximately 6-km resolution dataset is successful in representing the Kuroshio
cross-current structure and temporal variation of the Kuroshio current-axis position during 2000–2010. The authors use this
dataset to examine the winter Kuroshio path destabilization phenomenon. Its seasonal features are characterized as follows:
the velocity shear on the inshore side of the Kuroshio becomes stronger and the Kuroshio path state becomes unstable from
the summer to winter. This evidence is consistent with the hypothetical mechanism governing the destabilization phenomenon
discussed in a previous study. Furthermore, the interannual amplitude modulation of the seasonality is examined in relation
to interannual variations in the winter northerly wind over the northern Okinawa Trough and the Pacific Decadal Oscillation
(PDO) index. The destabilization phenomenon appears 15 times in the period 2000–2010. Ten cases are related to local wind
effects, and 7 of these are also connected with the PDO index. This is probably because the winter northerly wind over the
northern Okinawa Trough is regulated by the PDO signal in interannual time-scales. Only 4 cases are related to the PDO index,
but their driving mechanism remains uncertain. 相似文献
16.
Variations of the Kuroshio Axis South of Kyushu in Relation to the Large Meander of the Kuroshio 总被引:1,自引:0,他引:1
The characteristics of the Kuroshio axis south of Kyushu, which meanders almost sinusoidally, are clarified in relation to
the large meander of the Kuroshio by analyzing water temperature data during 1961–95 and sea level during 1984–95. The shape
of the Kuroshio axis south of Kyushu is classified into three categories of small, medium, and large amplitude of meander.
The small amplitude category occupies more than a half of the large-meander (LM) period, while the medium amplitude category
takes up more than a half of the non-large-meander (NLM) period. Therefore, the amplitude and, in turn, the curvature of the
Kuroshio axis is smaller on average during the LM period than the NLM period. The mean Kuroshio axis during the LM period
is located farther north at every longitude south of Kyushu than during the NLM period, with a slight difference west of the
Tokara Islands and a large difference to the east. A northward shift of the Kuroshio axis in particular east of the Tokara
Islands induces small amplitude and curvature of the meandering shape during the LM period. During the NLM period, the meandering
shape and position south of Kyushu change little with Kuroshio volume transport. In the LM formation stage, the variation
of the Kuroshio axis is small west of the Tokara Islands but large to the east due to a small meander of the Kuroshio. In
the LM decay stage, the Kuroshio meanders greatly south of Kyushu and is located stably near the coast southeast of Kyushu.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
17.
黑潮入侵深刻影响东海生态环境,但对其如何影响浮游植物群落组成与分布仍知之甚少。为此,于2011年四季对东海(26°~33°N,121°~128°E)共164个站位进行浮游植物拖网采集和环境因子测定,分析了浮游植物丰度和优势种组成及其对黑潮入侵的响应。调查共检出浮游植物9门509种(含变种、变型和未定种),其中硅藻305种、甲藻154种,蓝藻、定鞭藻、金藻、裸藻、绿藻、隐藻和黄藻种类数较少。秋季浮游植物细胞丰度最高(30 496.91×103 cells/m3),高值区位于黑潮与长江冲淡水交汇形成的锋面处;夏季次之(28 911.28×103 cells/m3),高值区分布与秋季相似;春季较少(19 180.76×103 cells/m3),高值区位于舟山群岛东南部;冬季最低(472.36×103 cells/m3),高值区位于东海南部。冬季受黑潮表层水入侵影响,主要优势种为铁氏束毛藻(Trichodesmium thiebautii);春、夏季主要优势种为骨条藻(Skeleto... 相似文献
18.
基于日本气象厅“长风丸”调查船在2002年4~5月航次期间的CTD资料,结合卫星风场资料,采用改进逆方法计算了琉球群岛两侧海域各断面的流速和流量分布,并分析卫星跟踪浮标资料和同期的卫星高度计资料,得出下面一些主要结论:(1)黑潮流速在PN断面上只有一个流核.通过断面PN的净东北向流量约为34.7×106m3/s,此流量包括台湾暖流、东海黑潮和黑潮以东的反气旋涡的流量.(2)黑潮流速在断面TK上有两个流核,通过断面TK净东向的流量为25.6×106m3/s,黑潮通过海峡后流向断面ASUKA.(3)冲绳岛东南海区琉球海流的流量约为8.8×106m3/s,并流向断面AM.(4)奄美大岛以东的北向海流的流量为12.7×106m3/s,并流向断面ASUKA.在断面ASUKA东南部出现一个中尺度反气旋涡,直径约240 km,其流量约为28.5×106m3/s.(5)四国以南黑潮第一层水体基本来源于通过吐噶喇海峡的黑潮,第二、三层水体来自吐噶喇海峡和奄美大岛以东海域的流量大致相当,而第四层的流量则主要来自于奄美大岛以东海域.(6)浮标资料显示,奄美大岛以东的海流部分来自于断面AM以东海区,并通过断面ASUKA. 相似文献
19.
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
20.
Trajectories of mesoscale eddies in the Kuroshio recirculation region were investigated by using sea surface height (SSH)
anomaly observed by the TOPEX/POSEIDON and ERS altimeters. Cyclonic and anticyclonic eddies have been traced on maps of the
filtered SSH anomaly fields composed from the altimeter observations every ten days. Both the cyclonic and anticyclonic eddies
propagate westward in the Kuroshio recirculation region from a region south of the Kuroshio Extension. The propagation speed
of these eddies has been estimated as about 7 cm s−1, which is much faster than the phase speed theoretically estimated for the baroclinic first-mode Rossby wave in the study
area. It was also found that in the Izu-Ogasawara Ridge region, most of eddies pass through the gap between the Hachijojima
Island and Ogasawara (Bonin) Islands, and some of the eddies decay around the Izu-Ogasawara Ridge. It seems that the trajectory
of the eddies is crucially affected by the bottom topography. In the region south of Shikoku and east of Kyushu, some of the
eddies coalesce with the Kuroshio. It is also suggested that this coalescence may trigger the path variation of the Kuroshio
in the sea south of Japan.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献