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Temporal and spatial characteristics of warm and cold eddies in the Kuroshio-Oyashio transision regions, and their effects on larval survival.

黑潮-亲潮转换区冷暖涡时空特征及其对幼虫生存的影响.

基本信息

批准号：
08454129
负责人：
SUGIMOTO Takashige
金额：
$ 1.73万
依托单位：
Ocean Reserch Institute, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454129/
关键词：
The Kuroshio The Kuroshio Extension Warm core eddy Warm streamer Larval transport Frontal disturbance Sea water mixing

项目摘要

In the first year, statistical analysis of the past oceanographic data was proceeded. Obtained result are as follows, (1) Kuroshio water spreads toward Kuroshio-Oyashio transition region, whose behavior is described by an isotherm defined at the northern edge of the trough of the meandered path the Kuroshio Extension, (2) the predominant periods of the north-south fluctuation of the northern boundary of the Kuroshio Extension are 20-30 days and about 50 days, which correspond to the perio of the frontal waves of the Kuroshio in the south of Japan. Though the first and second years, field observations were persecuted by using R/Vs Hakuho-Maru and Tansei-Maru as well as a car ferry boa which is shutting between Tokyo and Tomakomai. Obtained results are as follows, (3) the cross sections of the current velocities near the ridge of the meandered path observed with CTD and ADCP shows peaks in the both sides of the axis, (4) origin of the spread Kuroshio water comes from the dept of 300-400m in the Kuroshio axis along the isopicnal surface, (5)drifting buoys near the Kuroshio front detrained from the Kuroshio in the down stream side of the ridge of the meandered Kuroshio path when the anticyclonic dcurvature increases, (6) local characteristics and their reasons of the spring bloom off the east coast of Japanese main island were made clear based on the continuous water sampling from the bottom of the ferry boat during February-June, 1997.

在第一年，对过去的海洋学数据进行了统计分析。结果表明：（1）黑潮水向黑潮-俄亥俄过渡区扩散，其行为可用黑潮延伸体弯曲路径槽北方边缘的等温线描述;（2）黑潮延伸体北方边界南北波动的主要周期分别为20-30天和50天左右;对应于日本南部黑潮锋面波的周期。虽然第一年和第二年，实地观察受到了使用R/V Hakuho-Maru和Tansei-Maru以及东京和Tomakomai之间关闭的汽车渡轮boa的迫害。结果表明：（3）CTD和ADCP观测到的弯曲路径脊附近的流速断面在轴的两侧都有峰值;（4）黑潮扩散水的来源是沿沿着等深面在黑潮轴300- 400 m深处;（5）当反气旋曲率增大时，黑潮锋附近的漂流浮标在弯曲黑潮路径脊的下游侧偏离黑潮，（6）根据1997年2 ~ 6月在日本本岛东海岸进行的船底连续水样采集，明确了日本本岛东海岸春季水华的局部特征及其原因。