A numerical investigation of eddy-induced chlorophyll bloom in the southeastern tropical Indian Ocean during Indian Ocean Dipole-2006

作者：Iskandar Iskhaq^*; Sasaki Hideharu; Sasai Yoshikazu; Masumoto Yukio; Mizuno Keisuke

来源：Ocean Dynamics, 2010, 60(3): 731-742.

DOI：10.1007/s10236-010-0290-6

• Chlorophyll-a
• Upwelling
• Coupled physical-biological model
• Indian Ocean Dipole
• Southeastern tropical Indian Ocean

An eddy-resolving coupled physical-biological model is used to study the effect of cyclonic eddy in enhancing offshore chlorophyll-a (Chl-a) bloom in the southeastern tropical Indian Ocean during boreal summer-fall 2006. The results demonstrate that the offshore Chl-a blooms are markedly coincident with the high eddy kinetic energy. Moreover, the vertical variations in Chl-a, nitrate, temperature, and mixed-layer depth (MLD) strongly imply that the cyclonic eddies induce surface Chl-a bloom through the injection of nutrient-rich water into the upper layer. Interestingly, we found that the surface bloom only occurs when the deep Chl-a maximum is located within the MLD. On the other hand, the response of subsurface Chl-a to the eddy pumping is remarkable, although it is hardly observable at the surface.

• 出版日期2010-6