Intraseasonal atmospheric forcing effects on the mean state of ocean surface chlorophyll

摘要: [1] Rectification of surface chlorophyll (Chl) concentration by the atmospheric intraseasonal variability is detected in a numerical biophysical ocean model when it forced composite Madden-Julian Oscillation (MJO) events. In addition to shoaled mixed layer depth (MLD) previously reported, found that increased mean Chl MJO forcing mostly co-occurs with isothermal (ITD) / nutrient isopleths and reduced barrier thickness (BLT). Case studies reveal increases MLD ITD variations, which enhances vertical mixing brings nutrients thereby increasing concentration. The seasonal annual are due asymmetric responses wind forcing; i.e., shoaling weaker more sensitive than deepening stronger wind. Reduced BLT because larger shoaling. As an exception, both southern Bay Bengal. Here, climatologically deep active season (boreal summer), different phase between variations results temporarily large BLT. However, this does not effectively isolate from nutrient-rich deeper ocean. Lastly, observations support our findings limited regions seasons, though further investigation necessary confirm effect on Chl.