BGC-Argo Observations and Physical-Biogeochemical Modeling in Western Pacific Ocean
Abstract
The Biogeochemical-Argo (BGC-Argo) Program aims at operating a network of profiling floats equipped with sensors of key biogeochemical variables for supporting research activities that address impacts of changing climate on ocean biogeochemical cycles and ecosystems. In the Western Pacific, there are only a few BGC-Argo floats deployed during the last several years. In this talk, we will show examples of using BGC-Argo floats and coupled physical-biogeochemical models to investigate how ocean circulation and mesoscale eddies affect on biogeochemical processes and distributions in the water column. The subtropical gyre region is an oligotrophic environment where satellite observed chlorophyll does not appear to be correlated with mesoscale eddies. We use continuous measurements from two BGC-Argo floats and show that surface chlorophyll is mostly controlled by a wind-induced mixing process, while subsurface chlorophyll maximum (SCM) is modulated by mesoscale eddies. Anomalies of dissolved oxygen (DO) are evident in eddies caused by the upwelling/downwelling process. With these BGC-Argo floats, different responses of the SCM to cyclonic and anticyclonic eddies, and those between the eddy core and edge region, are revealed by combining results from 10 tracked eddies, demonstrating diverse mechanisms associated with mesoscale and submesoscale dynamics. We also use a coupled physical-biogeochemical model based on ROMS-CoSiNE to address how mesoscale and submesoscale physical processes impact on biogeochemical processes and distributions in the upper ocean.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMOS41A..01C
- Keywords:
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- 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions;
- GEODESY AND GRAVITYDE: 4262 Ocean observing systems;
- OCEANOGRAPHY: GENERALDE: 4273 Physical and biogeochemical interactions;
- OCEANOGRAPHY: GENERALDE: 4532 General circulation;
- OCEANOGRAPHY: PHYSICAL