Research of characteristics of turbulent mixing in the Prydz Bay with intrusion of modified circumpolar deep water

Hu Junyang; Liang Chujin; Lin Feilong

doi:10.12284/hyxb2021029

Volume 43 Issue 3

Apr. 2021

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Hu Junyang，Liang Chujin，Lin Feilong. Research of characteristics of turbulent mixing in the Prydz Bay with intrusion of modified circumpolar deep water[J]. Haiyang Xuebao，2021, 43(3)：1–12 doi: 10.12284/hyxb2021029

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Research of characteristics of turbulent mixing in the Prydz Bay with intrusion of modified circumpolar deep water

doi: 10.12284/hyxb2021029

State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Minisitry of Natural Resources, Hangzhou 310012, China

Received Date: 2020-03-07
Rev Recd Date: 2020-06-08

Available Online: 2021-03-27

Publish Date: 2021-04-23

Abstract

Abstract

Based on the CTD data from the 28th, 29th and 31st Chinese Antarctic Expedition cruises, we calculated dissipation rate of turbulent kinetic energy by using Thrope scale method, and analyzed the distribution characteristics of the dissipation rate and the structure of water masses in the Prydz Bay and its adjacent waters. Results show that the subsurface dissipation rate intensity of turbulent kinetic energy in the first two cruises reach maximum on the shelf break of Prydz Bay. Moreover, we compared the distribution of water masses among the three cruises and found intrusion of the modified circumplar deep water into the shelf happened on the 28th and 29th cruises. The the modified circumplar deep water could reach the depth of 100 m and 200 m on the cruise of 28th and 29th, respectively, and can extend southward to 67.5°S. Furthermore, the distribution of subsurface dissipation rate of turbulent kinetic energy on the shelf break of Prydz Bay are well related to the structure of local water masses. Therefore, the intrusion of the modified circumplar deep water into the shelf could induce instability of the local waters, promote water exchange and finally enhance local turbulent mixing.

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