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| Abstract Submission No. | ABS-2022-05-0383 |
| Title of Abstract | Modeling coastal upwelling dynamics and its influence on the pCO2 variability in the southeastern Arabian Sea. |
| Authors | Jayashree Ghosh*, Dr.Kunal Chakraborty |
| Organisation | Indian National Centre For Ocean Information Services |
| Address | INCOIS Residential Quarters,INCOIS,Pragathinagar,Hyderabad-500090 Hyderabad, Telangana, India Pincode: 500090 Mobile: 9932383158 E-mail: jayashree.g@incois.gov.in |
| Country | India |
| Presentation | Oral |
| Abstract | The Upwelling Systems are among the most productive areas in the world ocean. The upwelling zones are known to be biogeochemically active sites and are supersaturated with CO2 with respect to the atmosphere due to the input of carbon-rich waters from deeper layers. At the same time, the nutrient-rich water due to upwelling fuels the primary production and lowers the pCO2. These two processes influence the variation of CO2 across the sea-air interface. The southeastern Arabian Sea (SEAS) is one of the prominent upwelling zones of the Indian Ocean. The coastal upwelling dynamics strongly influence the biogeochemistry of this area. This study delineates the factors that regulate the spatio-temporal variability of pCO2 in SEAS using an ocean-ecosystem model simulated outputs and ship-based observations. The contribution of the physical dynamics and biological processes are segregated to enumerate the net effect of upwelling on surface ocean pCO2.The sea-surface temperature and dissolved inorganic carbon exert a significant influence in controlling the surface ocean pCO2 of SEAS. The colder temperature of the upwelled waters results in a drawdown of surface ocean pCO2 by 49.8 µatm. On the contrary, the presence of carbon-rich waters into the surface due to upwelling amplify the surface ocean pCO2 by 51.9 µatm. Salinity is not significantly controlling the variability of pCO2 of SEAS. It causes an increase of surface ocean pCO2 by 1.6 µatm. The contribution of biological pump consists of both hard and soft tissues leading to a decrease of surface ocean pCO2 by 1.9 µatm. It is found that the biological pump is more dominant in controlling the variability of pCO2, reducing the surface ocean pCO2 by 3.7 µatm, in the southern part of SEAS. It is evident that the physical dynamics is dominantly controlling the spatio-temporal variability of pCO2 in the SEAS. The contribution of the biological processes in controlling pCO2 variability is negligible when compared with the contribution of the physical dynamics. |