On understanding the land–ocean CO2 contrast over the Bay of Bengal: A case study during 2009 summer monsoon

Kumar, K Ravi; Tiwari, Yogesh K.; Valsala, Vinu; Murtugudde, Raghu

On understanding the land–ocean CO2 contrast over the Bay of Bengal: A case study during 2009 summer monsoon

2014

Kumar, K Ravi | Tiwari, Yogesh K. | Valsala, Vinu | Murtugudde, Raghu

Ship-based observations of atmospheric carbon dioxide (CO₂) concentration over the Bay of Bengal (BoB) between 17 July 2009 and 17 Aug 2009 offered an excellent opportunity to evaluate the land–ocean contrast of surface CO₂and facilitated its comparison with model simulated CO₂concentrations. Elevated values of CO₂with large variability near the coastal region and relatively low values with correspondingly lower variability over the open ocean suggest that this observed CO₂variability over the ocean essentially captures the differences in terrestrial and oceanic CO₂fluxes. Although the region under investigation is well known for its atmospheric intraseasonal oscillations of Indian summer monsoon during July and August, the limited duration of observations performed from a moving ship in a research cruise, is not able to capture any high-frequency variability of atmospheric CO₂concentrations. But band-passed sea surface temperature and wind anomalies do indicate strong intraseasonal variability over the study region during the observational period. The synoptic data, albeit quite short in duration, thus offer a clear benchmark for abrupt variability of CO₂concentration between land and ocean.

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