共查询到20条相似文献，搜索用时 15 毫秒
1.
Song Wanxian 《海洋学报(英文版)》1994,13(2):189-201
ＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｓｕｍｍｅｒａｎｄｗｉｎｔｅｒｃｉｒｃｕｌａｔｉｏｎｓａｎｄｔｈｅｉｒｖａｒｉａｂｉｌｉｔｙｉｎｔｈｅｓｏｕｒｃｅａｒｅａｏｆｔｈｅＴｓｕｓｈｉｍａＷａｒｍＣｕｒｒｅｎｔ￥ＳｏｎｇＷａｎｘｉａｎ（ＲｅｃｅｉｖｅｄＮｏ... 相似文献
2.
Wang Chunsheng He Dehu Liu Hongbin Yang Guanming Miao Yutian Yu Honghua 《海洋学报(英文版)》1996,15(2):231-249
ＤｉｓｔｒｉｂｕｔｉｏｎｏｆｚｏｏｐｌａｎｋｔｏｎｂｉｏｍａｓｓｉｎｔｈｅｓｏｕｔｈｅａｓｔｅｒｎＥａｓｔＣｈｉｎａＳｅａ￥ＷａｎｇＣｈｕｎｓｈｅｎｇ；ＨｅＤｅｈｕａ；ＬｉｕＨｏｎｇｂｉｎ；ＹａｎｇＧｕａｎｍｉｎｇ；ＭｉａｏＹｕｔｉａｎａｎｄＹｕＨｏ... 相似文献
3.
Spatial variability in the primary productivity in the East China Sea and its adjacent waters 总被引：7，自引：0，他引：7
Primary productivity in the East China Sea and its adjacent area was measured by the13C tracer method during winter, summer and fall in 1993 and 1994. The depth-integrated primary productivity in the Kuroshio
Current ranged from 220 to 350 mgC m−2d−1, and showed little seasonal variability. High primary productivity (above 570 mgC m−2d−1) was measured at the center of the continental shelf throughout the observation period. The productivity at the station nearest
to the Changjiang estuary exhibited a distinctive seasonal change from 68 to 1,500 mgC m−2d−1. Depth-integrated primary productivity was 2.7 times higher in the shelf area than the rates at the Kuroshio Current. High
chlorophyll-a specific productivity (mgC mgChl.-a−2d−1) throughout the euphotic zone was mainly found in the shelf area rather than off-shelf area, probably due to higher nutrient
availability and higher activity of phytoplankton at the subsurface layer in the shelf area. 相似文献
4.
By using existing data obtained in the offshore area from the Boso Peninsula to the Joban Coast, it was shown that the double
structure of the Kuroshio Front — which is usually found along the northern edge of the Kuroshio Extension to the east 143°E
(Nagataet al., 1986 ; Shinet al., 1988) — is hardly found at the edge of the Kuroshio when it is flowing along the Japanese coast or in the area to the west
of 142°E. It was suggested that the cold and fresh water core beneath the density front of the double structure originates
from the fresh and cold Oyashio Water which is captured beneath the Kuroshio Front just off the Kashima Coast. The double
structure of the Kuroshio Front would be generated and developed very rapidly in the region between 142°E and 143°E just after
the Kuroshio leaves the Japanese coast. 相似文献
5.
Intrusion of less saline shelf water into the Kuroshio subsurface layer in the East China Sea 总被引：7，自引：0，他引：7
The possible origin and cause of the less saline shelf water detected in the Kuroshio subsurface layer around the shelf edge
of the East China Sea are investigated using observational results obtained in May 1998–2001 in conjunction with a dataset
archived by Japan Oceanographic Data Center and a numerical model. The observations show that subsurface intrusions of less
saline water are always detected in May in layers above 24.5σθ isopycnal surface, and that salinity inversions (i.e., areas
in which the less saline water lies beneath the saline water) are detected around the trough of the Kuroshio frontal eddy
(or wave). Analyses of the archived dataset reveal that the isopycnal surface of 24.5σθ is the deepest layer of the Kuroshio
pycnocline outcropping to the sea surface on the shallow shelf in early spring. Outcropping isopycnals above 24.5σθ encounter
a less saline water plume originating from the Changjiang, especially in the western East China Sea. Thereafter, the less
saline water moves along isopycnal layers and reaches the Kuroshio front around the shelf edge. Numerical models demonstrate
that, when the frontal wave captures the less saline water, the shelf water takes the form of a salinity inversion in the
trough because isohalines in the frontal wave have a phase lag between the upper and lower layers in consequence of the baroclinic
instability. 相似文献
6.
Ryohei Sasayama Nanako Hioki Yuichiroh Morita Yutaka Isoda Keiri Imai Atsushi Ooki Kenshi Kuma 《Journal of Oceanography》2018,74(4):367-379
We studied the behavior of chemical substances in the upper 300 m of the water column across the continental shelf–slope interface in the East China Sea off the Okinawa Trough. The behaviors of iron, inorganic nutrients, and humic-like fluorescent dissolved organic matter were strongly influenced by the extensive water exchange between the East China Sea and the Kuroshio Current across the shelf break and slope via upwelling and frontal processes. We attributed the high humic-like fluorescent intensity at the subsurface of the shelf break and slope regions to the lateral supply of humic-like fluorescent dissolved organic matter from the shelf sediments to the outer shelf region due to the intrusion of shelf water into Kuroshio subsurface water. We found that the behavior of iron at the continental shelf–slope was remarkably different from the conservative mixing of inorganic nutrients and humic-like fluorescent dissolved organic matter. In deep and bottom waters at the shelf–slope, high total iron concentrations, which were closely related to water transmittance, possibly resulted from the swept transport of iron-rich resuspended sediments over the shelf floor from the slope by the invading Kuroshio Intermediate Water close to the bottom. 相似文献
7.
Masaru Maeda 《Journal of Oceanography》1986,42(5):333-346
Dissolved copper concentrations in surface waters of the Bering Sea ranged from 106 to 882 ngl–1. Higher concentrations were found in continental shelf waters. In the northwestern North Pacific dissolved copper ranged from 54 to 140 ngl–1. Particulate copper concentrations varied regionally and seasonally from 6 to 79 ngl–1. Regionally averaged particulate copper concentrations decreased from 175 to 33g g–1 against an increase in suspended materials because of the dilution effects of biological fractions. Apparent sporadic increases in copper concentrations were found in the mixing area of the Kuroshio and the Oyashio waters. The feature is attributed to the lateral distribution of different water types rather than to the upwelling of deeper waters by eddies. In the same area west of 160E, waters with high concentrations of dissolved copper (96±9 ngl–1) were found. Their origin appears to be the continental shelf of the Bering Sea. In spite of intensive biological activity, a considerable fraction of copper added to shelf waters was transported to the area off Japan via the circulation in the Bering Sea and the Oyashio current. 相似文献
8.
夏季台湾海峡水及黑潮次表层涌升水向东海近陆架区营养盐输送通量的估算 总被引：2，自引：1，他引：1
According to historical mean ocean current data through the field observations of the Taiwan Ocean Research Institute during 1991–2005 and survey data of nutrients on the continental shelf of the East China Sea(ECS) in the summer of 2006, nutrient fluxes from the Taiwan Strait and Kuroshio subsurface waters are estimated using a grid interpolation method, which both are the sources of the Taiwan Warm Current. The nutrient fluxes of the two water masses are also compared. The results show that phosphate(PO4-P), silicate(SiO3-Si) and nitrate(NO3-N) fluxes to the ECS continental shelf from the Kuroshio upwelling water are slightly higher than those from the Taiwan Strait water in the summer of 2006. In contrast, owing to its lower velocity, the nutrient flux density(i.e., nutrient fluxes divided by the area of the specific section) of the Kuroshio subsurface water is lower than that of the Taiwan Strait water. In addition, the Taiwan Warm Current deep water, which is mainly constituted by the Kuroshio subsurface water, might directly reach the areas of high-frequency harmful alga blooms in the ECS. 相似文献
9.
Based on the observational current meter data from two mooring systems located between Chilung and the Pengjiayu Island from July 1980 to July 1981, and other oceanographic observational data in the south of the East China Sea, some problems on the flow of seawater in this area in summer are analysed in this paper. It is considered that a possible passage where the subsurface water of the Kuroshio flows into continental shelf area of the East China Sea is the lower layer of the region between Chilung and the point of 122°30′ E, 25°40′N. After passing through this passage, it flows roughly towards northeast along about 100 m isobath. The "Taiwan Warm Current" coming from the Taiwan Strait only passes through the upper layer of this area. The influence of the Taiwan Island on the flow and the eddies in this area are also discussed. 相似文献
10.
Toshimichi Ito Arata Kaneko Hiroyuki Tsubota Noriaki Gohda 《Journal of Oceanography》1994,50(4):465-477
The localized near-bottom water with silica content higher than that in the adjacent shelf water was observed to exist at the eastern margins of the East China Sea continental shelf. The core of the high silica water possessed the silica content corresponding to that in the Kuroshio at depths greater than on the shelf. The mixing analysis of water masses using temperature (T) and silica (Si) showed that the core water can be produced through the vertical mixing of intermediate water of the Kuroshio deeper than 100 m. This study provides us a conclusion that the intermediate water of the Kuroshio is strongly mixed on the shelf slope and then upwelled to form the ridge-like distribution of water masses with low temperature and high silica content at the shelf edge. 相似文献
11.
基于个体模型的东海鲐鱼渔场形成机制研究 总被引：4，自引：2，他引：2
鲐鱼Scomber japonicus资源丰富,在我国近海渔业中占有重要地位。其渔场的形成受海洋环境的制约,本文确定鲐鱼运动和物理环境之间的响应关系,建立起了基于个体的东海鲐鱼生长洄游模型。结果显示,鲐鱼集群分布与捕捞生产渔场基本吻合,鲐鱼聚集主要受台湾暖流、大陆沿岸水、黑潮影响,往往集群在一定温度范围内并在冷暖交汇区温盐梯度大偏暖水一侧。在台湾暖流和沿岸水交汇的锋面附近、台湾暖流暖水舌前端、黑潮与中国大陆沿岸水形成的潮境区域均有大量的鲐鱼聚集,并形成渔场。产卵位置的变动使偏西产卵位置的鲐鱼由于受台湾暖流影响较大,鲐鱼会呈长带状大量聚集在台湾暖流和沿岸水的锋面附近,并使在台湾暖流暖水舌前端的聚集数量增多,而偏东的产卵的鲐鱼受黑潮影响较大,聚集分布范围较大,会使黑潮形成的锋面附近聚集数量增多,而使台湾暖水舌的前端的聚集量减少。正常产卵位置在生存率方面是最佳产卵位置。研究表明鲐鱼所处空间位置不同,会影响其集群的位置,用数值模型验证了物理环境会对鲐鱼的洄游和渔场的形成产生影响。 相似文献
12.
Observations of the countercurrent on the inshore side of the Kuroshio northeast of Taiwan 总被引：4，自引：0，他引：4
Intensive current measurements in the area northeast of Taiwan indicate subsurface, southwestward flow existed between the inshore edge of the Kuroshio and the East China Sea continental slope. At 70 km away from Taiwan, this countercurrent has a mean speed about 30 cm s–1 at mid-depth. Closer to Taiwan, the flow turns along with the topography, and subjects to sidewall and bottom friction. Both the magnitude and the vertical shear of this countercurrent are comparable with that inferred from hydrographic survey. The wind field features short-period (a few days) fluctuations associated with the cold front passages, however, this is not reflected on the current records. It appears that the countercurrent is fairly steady. Together with similar reversing flow found at places much further to the north, the overall pattern seems to be a general quasi-steady feature along most part of the shelf edge of the East China Sea. 相似文献
13.
根据国家海洋局1977年12月份至1978年11月份在黄海南部和东海(28°~34°N,120°30'~127°00'E)广大海域进行周年逐月份的12航次综合调查资料,对该海域毛颚类数量变动、时空分布及其与环境因子的关系进行了分析.结果表明,本调查区毛颚类的数量以6~9月份较高,7月份为年最高值.1~4月份为年低值期,尤以4月份为最低谷.其中在数量上取主导作用的种类是肥胖箭虫(Sagitta enflata)、强壮箭虫(S.crassa)拿卡箭虫(S.nagae)和百陶箭虫(S.bedoti)等种类.在平面分布上,长江口以北毛颚类数量一般高于长江口以南的海域,在南黄海,除夏季外,其他季节均有出现高值.在东海高密集区一般出现在不同水系交汇区,尤其在长江冲淡水、沿岸水和外海高温高盐水交汇的锋面最为密集.这对于不同水系在研究区内运动和消长有一定的指示意义. 相似文献
14.
Spatial and temporal variation of particulate organic carbon in the PN section of East China Sea 总被引：4，自引：0，他引：4
1 IntroductionThe carbon cycle in the ocean, related to theglobal warming and human food, is of great scientificsignificance. Studies for the carbon transfer and trans-formation in the ocean, including the assimilative andmetabolic capacity, have become one of key researchfoci in global biogeochemical studies (Tsunogai et al.,1997; Hu and Yang, 2001; Hansell et al., 2003; Wei etal., 2003; Yang et al., 2004; Yuan et al., 2004).As is known, POC is composed of living fractionsand organic debr… 相似文献
15.
台湾以北海域浮游桡足类生物海洋学特征的研究Ⅰ.数量分布 总被引：1，自引：0，他引：1
根据１９８７～１９９０年间在台湾以北海域进行的６个航次的调查资料,对该海域浮游桡足类数量分布作了探讨,结果表明,本区浮游桡足类丰度在春季最高,冬季最低,夏、秋季介于中间;黑潮锋内侧的桡足类丰度一般高于黑潮锋外侧,较高丰度区的分布具夏季最向外海、冬季最靠近岸、其他两季居中的趋势,这与黑潮锋位的季节摆动趋势基本相一致;浮游桡足类丰度的较高值区一般出现在不同水系的交汇区,尤其是黑潮次表层水涌升域的近岸边缘侧,而在黑潮次表层水的主水体中,因溶解氧含量低等因素,其丰度一般均较低;浮游桡足类丰度垂直分布趋势为随水深增加而减低,生物本身昼夜垂直移动规律可能是局部区域产生异常分布的原因之一． 相似文献
16.
Hydrographic observations collected by conductivity-temperature-depth(CTD) and instrumented elephant seals on the Prydz Bay continental shelf during 2012 and 2013 are used to characterize the intrusion of modified circumpolar deep water.As a regular occurrence,modified circumpolar deep water(MCDW) intrudes onto the shelf mainly between 150–300 m layer of 73°–75°E and then turns southeast affected by the cyclonic gyre of the Prydz Bay.The southernmost point of the warm water signal is captured on the east front of Amery Ice Shelf during March 2012.In terms of vertical distribution,MCDW occupies the central layer of 200 m with about 100 m thickness in the austral summer,but when to winter transition,the layer of MCDW deepens with time on the central shelf. 相似文献
17.
本文根据日本气象厅在台湾以北获得的调查资料及近几年国家海洋局在该海域获得的调查资料,结合卫星图片,分析了夏季和冬季台湾以北海域陆架水与黑潮水的混合与交换过程以及涡旋在水交换过程中所起的作用。结果表明,夏季陆架水从表层向外海方向扩展,与黑潮水进行混合与交换;在陆架底部,黑潮次表层水涌升陆架后与陆架底层水进行混合。冬季由于黑潮表层水大举入侵陆架,低温的陆架水只能沿陆架向南流动,并在台湾西北部转向东沿台湾北岸向东流动,该海域存在的涡旋就象一个旋转泵,在陆架水与黑潮水的混合与交换过程中起了重要的作用。最后,文中还对陆架水与黑潮水的交换量进行了估算。 相似文献
18.
黑潮与邻近东海生源要素的交换及其生态环境效应 总被引：2，自引：0，他引：2
黑潮与东海生源要素的交换对东海的生态环境有重大影响,交换主要是经台湾东北部海域输送至东海陆架和通过日本九州西南海域由东海陆架向外海的黑潮输出两个通道。中国科学院海洋先导专项对黑潮与邻近东海生源要素的交换特征进行了系统的调查和研究,获得了一些新的认识:(1)在台湾东北部区域,碳主要以表层水-次表层水为载体输入,秋季的输入量高于夏季;黑潮溶解态营养盐的输入占据绝对主导地位,且以黑潮次表层热带水-中层水的输入为主,输入通量春季高于夏、秋季,可为东海春季水华提供一定的物质基础,但输入到东海的黑潮水其氮磷比与Redfield比值(16:1)接近,这些"正常水"——黑潮的输入显然对调和东海异常高的氮磷比有重要的作用,从而对东海的生态环境起到"稳定和缓冲"作用。所以,黑潮水对东海的输入不仅维持补充了东海生态系统运转所需的生源要素,更为重要的是缓冲了受人为影响强烈的东海海水的高氮磷比,使东海本已失常的营养盐结构向合适的氮磷比方向转变。因此,黑潮与东海生源要素的输入在一定程度上起着稳定和缓和东海生态环境的作用。(2)通过构建的海水Ba-盐度新指标体系,定量细致刻画了黑潮对东海生源物质在台湾东北部区域的输入范围和程度,黑潮次表层水从台湾东北陆架坡折处沿底部向北偏西方向入侵东海,其近岸分支可以入侵到浙江近岸,其黑潮次表层水占比仍可达到65%左右。垂直方向上,陆架外侧站位受黑潮次表层水的影响范围更大,黑潮水占50%比例位置可延伸至外侧TW0-1站位(122.59°E,25.49°N)表层,而内侧靠近大陆的站位则只限于陆架中部位置底层。 相似文献
19.
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
20.
Spring phytoplankton bloom in the fronts of the East China Sea 总被引：2，自引：0，他引：2
Frontal areas between warm and saline waters of the Kuroshio currents and colder and diluted waters of the East China Sea
(ECS) influenced by the Changjiang River were identified from the satellite thermal imagery and hydrological data obtained
from the Coastal Ocean Process Experiment (COPEX) cruise during the period between March 1st and 10th, 1997. High chlorophyll concentrations appeared in the fronts of the East China Seas with the highest chlorophyll-a concentration
in the southwestern area of Jeju Island (~2.9 mg/m3) and the eastern area of the Changjiang River Mouth (~2.8 mg/m3). Vertical structures of temperature, salinity and density were similar, showing the fronts between ECS and Kuroshio waters.
The water column was well mixed in the shelf waters and was stratified around the fronts. It is inferred that the optimal
condition for light utilization and nutrients induced both from the coastal and deep waters enhances the high phytoplankton
productivity in the fronts of the ECS. In addition, the high chlorophyll-a in the fronts seems to have been associated with
the water column stability as well. 相似文献