物理海洋学名词-K 231

Glossary of Physical Oceanography and Related Disciplines

Steven K. Baum Department of Oceanography Texas A&M University

May 26, 2004

 

Kuroshio Extension That which the Kuroshio Current becomes when it separates from the continental rise at about 35◦ N in the western North Pacific Ocean. It flows eastward from this point as a strong jet which, given the proclivities of such things, evinces a strong instability. This is seen in two regions of north- and south-ward shift called the “First Crest” and the “Second Crest”, centered at approximately 140◦ E and 152◦ E, respectively, with a node near 147◦ E. East of these features the Shatsky Rise produces another region of alternate (but less regular) paths, followed by a passage over the Emperor Seamounts where it breaks up into filaments which partly comprise the North Pacific Current. The Kuroshio Extension is part of the overall wind-driven subtropical gyre circulation cell that exists in the North Pacific Ocean. See Stommel and Yoshida [1972] (especially Kawai [1972]), Tomczak and Godfrey [1994] and Hurlburt and Metzger [1998].
Kuroshio Deep Water (KDW) A water mass found in the East China Sea. KDW is usually located at depths of 900–100 m in the Okinawa Trough, and originates mainly from the passage between the Okinawa islands. The temperature and salinity are fairly stable at, respectively, 3.7◦ C and 34.48.
KDW is formed mainly via convection. See Yu-song and Xue-chuan [1994].
Kuroshio Intermediate Water (KIW) A water mass found in the East China Sea. KIW originates from northwest Pacific water, with the major part entering from east of Taiwan and most of the rest from between Okinawa and Miyako-Jima. It is located at around 900–1000 m and has a thickness range of 500–600 m, with the latter rapidly decreasing in the shallow area of the Okinawa Trough. The temperature and salinity ranges and averages of KIW are, respectively, 5.8◦–9.5◦ C (7.8◦ C) and 34.26–34.38 (34.32). A major feature is a low salinity core with small variations in temperature and salinity. Some KIW upwells on the continental slope. See Yu-song and Xue-chuan [1994].

Kuroshio Subsurface Water (KSSW) A water mass found in the East China Sea. KSSW originates from the near–surface water of the subtropical North Pacific, although in the winter its upper boundary is the sea surface as it merges with the Kuroshio Surface Water (KSW). In the summer the upper boundary ranges from 50–75 m depth with the lower boundary at about 400 m and shallowing towards the upper slope. The temperature decreases with depth from >20◦ C to about 15◦ C, and a salinity maximum is found between 125–200 m. The temperature and salinity range of this salinity core are, respectively, 17.0◦–23.2◦ C and 34.67–34.97. See Yu-song and Xue-chuan [1994].
 

 

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