II Influence Analyses of Kuroshio Meandering on Nutrient Behavior in and around Osaka Bay Yusuke NAKATANI and Shuzo NISHIDA In an enclosed bay, it is pointed out that not only terragenic but also oceanic nutrients might have a major influence on the water environment. In this study, numerical simulations are conducted to quantitatively clarify the influence of Kuroshio meandering on nutrient behavior in and around Osaka Bay. As a result, numerical model showed that the density structure and the behavior of oceanic water mass in the shelf varied greatly according to the Kuroshio distance. Moreover, the simulation results indicated that Kuroshio meandering changed the nutrient transport amounts through the Kitan Strait more than twice and therefore had a considerable influence on the balance and cycle of nutrients in the bay. 1. 2006 1997 Takashi 2006 2006 2. 1972 2005 1 100km 100km 1997 Takashi 2006 1
2008 3. 2 1 2 2001 9 2004 6 2005 8 3 7 8 2002 3 2005 4 1999 2002 2005 2 HydroQual Inc. POM ECOMSED RCA 41km 20 Smagorinsky Mellor-Yamada 3 24 C N P 2 DO C N P 3 8 4 3 3 4 6 7 8 3 4 4 2005 4 T.P. FRA-JCOPE2 Miyazawa 2009 NO 2 +NO 3 -N 2009 PO 4 -P SiO 2 -Si NO 2 +NO 3 -N 114
1.5 Kriging 2011 4 5 R 2 RMSE 2005 8 6 DIN PO 4 -P 5 2005 7 16 30 7 40m DIN V-line 4 8 DIN 9 a DIN 5 6 7 15 8 DIN
8 4. 1 2005 2002 Lagrangian80m 7 1 1:00 11 2 7 16 30 V-line 9 20 10 6.3cm/sec 11 20 2.8cm/sec 20 (a) (b) 9 7t (a) (b) 10 2 3 11 7 2008 I-N I-P 95.9tonN/day 5.3tonP/day 1.3 4.8 126.1tonN/day 14.3tonP/day I-N I-P 3 2
11 7 ton/day I-P 20% 5. 1 2 3 2 4 I-N3 I-P 20% B No.21360236 2006 43 2. 2008 55 pp. 391-395. 1997 73 2 pp. 49-60. 2011 B2 Vol. 67 No. 2 pp. I_886-I_890. 2009 B2 Vol. 65 No. 1 pp. 1126-1130. 2006 53 pp. 996-1000. 2008 55 pp. 1061-1065. Miyazawa, Y., R. Zhang, X. Guo, H. Tamura, D. Ambe et al. 2009 : Water mass variability in the western North Pacific detected in a 15-year eddy resolving ocean reanalysis, J. Oceanogr., Vol. 65, pp. 737-756. Takashi, T., T. Fujiwara, T. Sumitomo and W. Sakamoto 2006 : Prediction of slope water intrusion into the Kii Channel in summer, J. Oceanogr., Vol. 62, pp. 105-113.