Ecological–physical modelling for warm core ring 93A of Kuroshio extension focused on a blooming event inside WCR

Abstract An ecological–physical coupled model was applied to simulate warm core ring (WCR) 93A off the Sanriku area of Japan for ADEOS campaign period, April–June 1997. Southeastward movement of WCR as observed by satellite imaging was reproduced. The increase in phytoplankton concentration with time and its subsequent decay inside the WCR, accompanied by Kuroshio water intrusion, were also well simulated by the model. These processes can be explained by the horizontal advection of surrounding high chlorophyll water into the WCR grazing of phytoplankton by zooplankton.

[1]  Allan R. Robinson,et al.  Coupled physical and biological modelling of the spring bloom in the North Atlantic (II): three dimensional bloom and post-bloom processes , 1995 .

[2]  I. Orlanski.  A Simple Boundary Condition for Unbounded Hyperbolic Flows , 1976 .

[3]  Ralph Shapiro,et al.  Smoothing, filtering, and boundary effects , 1970 .

[4]  D. Phinney,et al.  Rotary motions and convection as a means of regulating primary production in warm core rings. [of ocean currents] , 1985 .

[5]  S. Saitoh,et al.  Satellite and ship observations of Kuroshio warm-core ring 93A off Sanriku, northwestern North Pacific, in spring 1997 , 1998 .

[6]  Allan R. Robinson,et al.  Physical processes, field estimation and an approach to interdisciplinary ocean modeling , 1996 .

[7]  Y. Yamanaka,et al.  An ecological-physical coupled model applied to Station Papa , 1995 .

[8]  T. Platt,et al.  Estimation of new production in the ocean by compound remote sensing , 1991, Nature.

[9]  Andreas Oschlies,et al.  Eddy-induced enhancement of primary production in a model of the North Atlantic Ocean , 1998, Nature.

[10]  B. Irwin,et al.  The kinetics of nitrogen utilization in the oceanic mixed layer: Nitrate and ammonium interactions at nanomolar concentrations , 1996 .

[11]  K. Baker,et al.  Spatial and temporal patterns in pigment biomass in Gulf Stream warm‐core ring 82B and its environs , 1985 .

[12]  R. Pacanowski,et al.  Parameterization of Vertical Mixing in Numerical Models of Tropical Oceans , 1981 .

[13]  G. Flierl,et al.  Prediction of phytoplankton growth in response to the frictional decay of a warm‐core ring , 1986 .

[14]  S. Spall,et al.  A numerical model of mesoscale frontal instabilities and plankton dynamics — I. Model formulation and initial experiments , 2000 .

[15]  Michio J. Kishi,et al.  Effects of interaction between two warm-core rings on phytoplankton distribution , 1994 .

[16]  Y. Yamanaka,et al.  Obtaining Reasonable Results in Different Oceanic Re- gimes with the Same Ecological-Physical Coupled Model , 1997 .