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GLIN==> UPCOMING SEMINAR

Dr. Jia Wang, Research Professor at the International Arctic Research Center (IARC), University of Alaska-Fairbanks will be giving a seminar on Monday, October 30 as a part of the NOAA/ University of Michigan Great Lakes Seminar Series.

Please find details of his talk listed below.

Speaker: Dr. Jia Wang, Research Professor International Arctic Research Center (IARC), University of Alaska-Fairbanks

Title: Simulating ice-ocean downscaling characteristics in the Beaufort-Chukchi seas using an IARC Coupled Ice-Ocean Model (CIOM)

Time: 10:30 AM

Location: Great Lakes Environmental Research Laboratory, 2205 Commonwealth Blvd., Ann Arbor, MI, 48105

Abstract:
An IARC regional CIOM (Coupled Ice-Ocean Model) based on POM was used to simulate the downscaling ice and ocean processes with 3.4-km resolution. The Beaufort Sea CIOM was nested to the CCSR/NIES/FRCGC high-resolution (1/6 x 1/4 degrees) global coupled atmosphere-sea ice-ocean-land model. Atmospheric forcing data were derived from NCEP reanalysis. Simulation of the seasonal cycle was conducted. In the Chukchi Sea, the Bering inflow separates into three branches: the first main branch flowing along Alaska’s coast is the Alaska Coastal Water (ACW); the second branch flows northward and turns to the right, joining the ACW along the Beaufort coast; and the third branch flows toward the Northwind Ridge. The Beaufort Gyre is well reproduced, superimposed by numerous mesoscale eddies, with anticyclones outnumbering cyclones. Downscaling sea ice dynamics was investigated, such as sea ice ridging, rafting, leads and landfast ice, which are not resolved in the previous coarse resolution model. This approach combining the global model for the 20th century climate simulation with the regional downscaling/nesting simulation helps understanding of both large-scale sea ice variability and small-scale sea ice dynamics. Sea ice breaks up offshore piece by piece with landfast ice untouched along the Beaufort Sea coast. Sea ice cracks from pack ice with irregular shapes are due to 1) complex ocean circulation, coastal current, and mesoscale eddies, 2) multi-category sea ice dynamics, and 3) complex and high-resolution geometry and topography. Sea ice ridging, rafting, and openings/leads are well reproduced in sea ice thickness and concentration. Model validation using in situ observations, satellite measurements, and historical datasets was also conducted.

A further application of CIOM to ice-related ecosystem modeling is underway in the Bering Sea and will lead to an IARC 3-D Physical (ice-ocean)-Ecosystem (biogeochemical) Model (PhEcoM), which consists of a 9-compartment model and a 4-compartment sea ice algae model. Another application of CIOM is to establish a nowcast/forecast system, such as in the Bohai Sea and northern Yellow Sea, China.
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If you have any questions or concerns, please email me at kanika.suri@noaa.gov; or call 734-741-2147.

For more information about the seminar series, please visit our website at http://www.glerl.noaa.gov/news/seminars/

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Kanika Suri
Web Designer Associate

NOAA Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.,
Ann Arbor, MI
48105

Tel: (734) 741-2147
Fax: (734) 741-2055

www.glerl.noaa.gov

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