10:00 AM - 10:15 AM
[ACG48-05] Evaluation of riverine heat inflow in the Arctic Ocean modeling
Keywords:Arctic Ocean model, land–ocean interaction, river water temperature, sea ice melting
In this study, to evaluate an impact of riverine heat inflow on sea ice in the Arctic Ocean, decadal experiments for 1979–2013 were performed using the Center for Climate System Research Ocean Component model version 4.9 (COCO4.9) in the pan-Arctic regional framework. The horizontal grid size was set to approximately 25 km, and atmospheric forcing components were constructed from the National Centers for Environmental Prediction–Climate Forecast System Reanalysis (NCEP–CFSR). First, the riverine volume inflow was given by three datasets, respectively, so that the sensitivity of sea ice and hydrography was checked. The model results in these cases showed similar interannual variability of sea ice thickness and sea surface salinity in each sub-domain (e.g., Kara and Beaufort seas). We then incorporated the river water temperature into the model experiment. The annual mean sea ice thickness in this case produced negative anomaly over the Siberian shelves and in the southern Canada Basin. The seasonal transitions in sea ice concentration and sea surface temperature indicated that riverine heat inflow into the Arctic Ocean accelerated summer sea ice opening and sea surface warming in the vicinity of major river mouths.