|
Title:
Development and Applications of a Coupled Circulation-Ice Modelling System with Nesting Capacity for the Northwest Atlantic Ocean |
Abstract:
A coupled circulation-ice modelling system with nesting capacity was developed for the northwest Atlantic (CCIMS-nwA) based on the Regional Ocean Modeling System (ROMS) and Los Alamos Sea Ice Model (CICE). CCIMS-nwA is forced by reanalysis-derived fields at the surface and lateral open boundaries, as well as tides, riverine freshwater input, and continental runoff. The performance of the CCIMS-nwA is assessed using the satellite remote sensing data and in-situ oceanographic observations. Analysis of three-dimensional (3D) model results for the 5-year period (2014-2018) shows that the freshwater in the top 100 m over the ECS flows equatorward, with significant seasonal variability. Freshwater flux over the northwestern Gulf of St. Lawrence is correlated strongly with the river discharge of St. Lawrence River. Wind forcing plays an important role in affecting interannual variability of cross-slope freshwater flux over the Labrador Shelf, northern Newfoundland Shelf and Scotian Shelf. The cross-slope freshwater transport over Grand Banks is affected significantly by eddies over the continental slope. Model results in different runs are used in examining effects of tides and sea ice on the 3D circulation and hydrography. Without tides, the surface salinity in Ungava Bay in summer is higher by up to ~7, with large differences in horizontal distributions of surface temperature and sea ice. Without sea ice, the sea surface temperature in summer is higher by up to ~5 degreeC in Baffin Bay.
|
Biography:
Dr. Jinyu Sheng is a Full Professor in Physical Oceanography at Dalhousie University, Canada. He received his doctoral degree in Physical Oceanography from the Memorial University of Newfoundland in 1990. He was a Postdoctoral Fellow and then Research Associate in the Department of Oceanography at Dalhousie University in1990-1998. Dr. Sheng has been a faculty member of Dalhousie since 1999. As a faculty member at Dalhousie, Dr. Sheng served as the NSERC/MARTEC/MSC Industrial Research Chair (Junior and then Associate) in the Regional Ocean Modelling and Prediction in 1999-2008. Jinyu also served as the Research Chair for the International Network to Improve Prediction of Model Extreme Marine Events in 2011-2016.
Dr. Sheng’s main research interest is physical oceanography, including coastal and shelf dynamics, developments and applications of numerical ocean circulation and wave models, modelling and prediction of extreme marine conditions, and wave-current and ice-current interactions. Dr. Sheng served as an editor-in-chief for the journal of Regional Studies in Marine Science in 2017-2021. He was guest editors for several scientific journals including “Ocean Dynamics”, “Atmosphere-Ocean” and “Journal of Marine Science and Engineering”. Dr. Sheng was awarded as the Applied Oceanography by the Canadian Meteorological and Oceanographic Society in 2018.
|