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Coupled Patterns Between Fields of Dynamic Height and Bottom Pressure in the Japan/East Sea
Xu, Yongsheng,Watts, D. Randolph,Wimbush, Mark 한국해양학회 2009 Ocean science journal Vol.44 No.1
Vertical coupling between shallow and deep mesoscale eddy processes in the southwestern Japan/East Sea is investigated using acoustic travel-time and bottom pressure measurements from a two-year deployment of an array of pressure-gauge-equipped inverted echo sounders. Canonical correlation analysis is applied to the simultaneously measured data to extract the coupled modes. The upper layer exhibits a migration of the Ulleung Warm Eddy, and correspondingly the deep potential vorticity in the Ulleung Basin adjusts in magnitude and sense to conserve potential vorticity. Coupling between meanders of strong upper currents and abyssal flows has been observed previously in the Gulf Stream during the Synoptic Ocean Prediction experiment. The evidence from our study strongly suggests that such coupling occurs also under much weaker flows.
Coupled Patterns Between Fields of Dynamic Height and Bottom Pressure in the Japan/East Sea
Yongsheng Xu,D. Randolph Watts,Mark Wimbush 한국해양과학기술원 2009 Ocean science journal Vol.44 No.1
Vertical coupling between shallow and deep mesoscale eddy processes in the southwestern Japan/East Sea is investigated using acoustic travel-time and bottom pressure measurements from a two-year deployment of an array of pressure-gauge-equipped inverted echo sounders. Canonical correlation analysis is applied to the simultaneously measured data to extract the coupled modes. The upper layer exhibits a migration of the Ulleung Warm Eddy, and correspondingly the deep potential vorticity in the Ulleung Basin adjusts in magnitude and sense to conserve potential vorticity. Coupling between meanders of strong upper currents and abyssal flows has been observed previously in the Gulf Stream during the Synoptic Ocean Prediction experiment. The evidence from our study strongly suggests that such coupling occurs also under much weaker flows. Vertical coupling between shallow and deep mesoscale eddy processes in the southwestern Japan/East Sea is investigated using acoustic travel-time and bottom pressure measurements from a two-year deployment of an array of pressure-gauge-equipped inverted echo sounders. Canonical correlation analysis is applied to the simultaneously measured data to extract the coupled modes. The upper layer exhibits a migration of the Ulleung Warm Eddy, and correspondingly the deep potential vorticity in the Ulleung Basin adjusts in magnitude and sense to conserve potential vorticity. Coupling between meanders of strong upper currents and abyssal flows has been observed previously in the Gulf Stream during the Synoptic Ocean Prediction experiment. The evidence from our study strongly suggests that such coupling occurs also under much weaker flows.
Observed deep circulation in the Ulleung Basin
Teague, W.J.,Tracey, K.L.,Watts, D.R.,Book, J.W.,Chang, K.-I.,Hogan, P.J.,Mitchell, D.A.,Suk, M.-S.,Wimbush, M.,Yoon, J.-H. Elsevier 2005 Deep-sea research. Part II, Topical studies in oce Vol.52 No.11
<P><B>Abstract</B></P><P>Records from 16 current meters and 23 pressure gauges moored near the sea floor in the Ulleung Basin of the southwestern Japan/East Sea (JES) characterized the deep circulation between June 1999 and July 2001. Mean currents range from 1 to 4cm/s and deep pressure anomalies range from 3 to 10mbar, with horizontal correlation scales of about 40km, and with integral time scales that range from about 5 to 20 days. Focusing here on the 90-day to interannual variability, synoptic maps of the deep currents and dynamic pressure fields determine that the deep circulation in the Ulleung Basin is cyclonic, with additional multiple cyclonic and anticyclonic cells that occur on sub-basin spatial scales. Over the Korea Plateau a northward deep outflow is observed that suggests an anticyclonic circulation pattern to the north. The annual average deep currents are remarkably similar for the 2 years, only slightly weaker in the second year. No seasonal pattern is discernable, except weakly at one or two sites.</P>