Basic study on baroclinic variations of the Kuroshio estimated from IES data

根据 IES 数据估算黑潮斜压变化的基础研究

• 批准号: 15340158
• 负责人: IMAWAKI Shiro
• 金额: $ 7.36万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340158/
• 关键词: IES (inverted echo sounder); Kuroshio; Sea-surface dynamic height; Satellite altimeter; Baroclinic transport; 淡青丸航海; 傾圧密度場; 黒潮流軸; 傾圧流速場; 沿岸水位; GEM(gravest empirical mode); 音波往復時間; 傾圧場

Vertical profiles of temperature and salinity are estimated by the GEM (gravest empirical mode) method from the IESs (inverted echo sounders) data deployed on coastal and offshore sites off cape Ashizuri, and then sea-surface dynamic height (SSDH) are calculated from those profiles. From difference of these SSDHs, a time series of baroclinic transport of the Kuroshio between these two stations are obtained. The IES-derived SSDH is compared with CTD-derived one ; the rms (root-mean-square) difference is 3.2 cm on the coastal site and 2.5 cm on the offshore site. Meanwhile, comparison between the SSDH anomaly derived from the CTD data and that obtained from the satellite altimetry data results in 3.6 cm and 2.9 cm rms differences on the coastal and offshore sites, respectively. These results confirm that the SSDH determined from the CTD data is closer to that of the IES data than that of the altimetry data. In addition, the steric height component confined in the surface-layer is estimated from the CTD vertical temperature profile as 5 cm in the altimetry but only 2 cm for the IES data.We also continued to add description on variations of the Kuroshio and to prepare dataset being compared with the IES data. In particular, hydrographic data along the ASUKA observational line off Shikoku are acquired by KT05-23 cruise on R/V Tanseimaru, and the period of the time series is expanded for variations of the Kuroshio axis position estimated from the surface velocity field obtained by combining the altimetry data and surface drifter data. Especially, the latter reveals that variations of the baroclinic transport of the Kuroshio obtained by the IES data are strongly influenced by variations of the Kuroshio axis position.We made a summary report on our achievements during this 3-year period.

利用部署在阿什祖里角近海和近海的逆回声测深仪(IESS)资料，利用重力经验模式(GEM)方法估算温度和盐度的垂直剖面，然后由这些剖面计算海面动态高度(SSDH)。由这两个站之间的SSDH差值，得到了两站间黑潮斜压输送的时间序列。比较了IES和CTD得到的SSDH，海岸站的均方根(RMS)相差3.2 cm，近海站的RMS差2.5 cm。同时，将CTD资料得到的SSDH距平与卫星测高资料得到的SSDH距平进行比较，结果表明近岸和近海的SSDH距平分别相差3.6 cm和2.9 cm。这些结果证实了由CTD数据确定的SSDH比由测高数据确定的SSDH更接近于IES数据。此外，根据CTD垂直温度廓线估算了近地层的位阻高度分量，高度计为5 cm，而IES资料仅为2 cm。我们还继续增加了对黑潮变化的描述，并准备了与IES资料进行比较的数据集。特别是，利用R/V Tanseimaru上的KT05-23巡航获取了四国近海明日香观测线上的水文数据，并根据测高数据和海面漂移数据得到的表面速度场估计的黑潮轴线位置的变化，扩展了时间序列的周期。特别是，后者揭示了由IES资料得到的黑潮斜压输送的变化受黑潮轴线位置变化的强烈影响。

项目成果

Effects of the Kuroshio on coastal sea level south of Japan

黑潮对日本南部沿海海平面的影响

• 发表时间: 2005
• 期刊: 2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-905 1-2
• 作者: 柿木康児;Koji Kakinoki;Daisuke Ambe;Zhongzhe Zhang
• 通讯作者: Zhongzhe Zhang

四国沖の黒潮の流量の時系列データ

四国近海黑潮流时间序列数据

• 发表时间: 2004
• 期刊: 月刊 海洋 号外 37巻
• 作者: 内田 裕;今脇資郎
• 通讯作者: 今脇資郎

S.Imawaki, H.Uchida, K.Ichikawa, D.Ambe: "Estimating the high-resolution mean sea-surface velocity field by combined use of altimeter and drifter data for geoid model improvement"Space Science Reviews. 108. 195-204 (2003)

S.Imawaki、H.Uchida、K.Ichikawa、D.Ambe：“通过结合使用高度计和漂移器数据来估计高分辨率平均海面速度场以改进大地水准面模型”《空间科学评论》。

M.Kashima, S.Imawaki, S.Umatani, H.Uchida, Y.Hashibe, H.Ichikawa, M.Fukasawa: "Geostrophy in the intermediate and deep layers of the Kuroshio and its recirculation regions south of Japan"Journal of Oceanography. 59巻・3号. 291-301 (2003)

M.Kashima、S.Imawaki、S.Umatani、H.Uchida、Y.Hashibe、H.Ich​​ikawa、M.Fukasawa：“日本南部黑潮及其再循环区域的中深层地地运动”海洋学杂志第 59 卷，第 3 期。291-301 (2003)

Detecting the Kuroshio axes south of Japan by using altimeter and drifter data

利用高度计和漂流器数据探测日本南部的黑潮轴

• 发表时间: 2005
• 期刊: 2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-905 1-2
• 作者: 柿木康児;Koji Kakinoki;Daisuke Ambe
• 通讯作者: Daisuke Ambe