Title Arctic ice-ocean simulation with optimized model parameters; Approach and assessment
Author Nguyen, A.T.; Menemenlis, D.; Kwok, R.
Author Affil Nguyen, A.T., University of California, Joint Institute for Regional Earth System Science and Engineering, Los Angeles, CA. Other: Jet Propulsion Laboratory
Source Journal of Geophysical Research, 116(C4), Citation C04025. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148-0227
Publication Date 2011
Notes In English. 84 refs. GeoRef Acc. No: 309715
Index Terms albedo; ice; ice cover; ice cover thickness; ocean currents; remote sensing; simulation; storms; thickness; volume; Bering Strait; Arctic Ocean--Chukchi Sea; Arctic Ocean--Fram Strait; Arctic Ocean--Makarov Basin; Arctic Ocean; Chukchi Sea; continental shelf; currents; cyclones; Fram Strait; Green function; ICESat; Makarov Basin; ocean circulation; optimization; satellite methods; sea ice; thermohaline circulation; tracers
Abstract We present an optimized 1992-2008 coupled ice-ocean simulation of the Arctic Ocean. A Green's function approach adjusts a set of parameters for best model-data agreement. Overall, model-data differences are reduced by 45%. The optimized simulation reproduces the negative trends in ice extent in the satellite records. Volume and thickness distributions are comparable to those from the Ice, Cloud, and land Elevation Satellite (2003-2008). The upper cold halocline is consistent with observations in the western Arctic. The freshwater budget of the Arctic Ocean and volume/heat transports of Pacific and Atlantic waters across major passages are comparable with observation- based estimates. We note that the optimized parameters depend on the selected atmospheric forcing. The use of the 25 year Japanese reanalysis results in sea ice albedos that are consistent with field observations. Simulated Pacific Water enters the Bering Strait and flows off the Chukchi Shelf along four distinct channels. This water takes ~5- 10 years to exit the Arctic Ocean at the Canadian Arctic Archipelago, Nares, or Fram straits. Atlantic Water entering the Fram Strait flows eastward, merges with the St Ana Trough inflow, and splits into two branches at the southwest corner of the Makarov Basin. One branch flows along Lomonosov Ridge back to Fram Strait. The other enters the western Arctic, circulates cyclonically below the halocline, and exits mainly through the Nares and Fram straits. This work utilizes the record of available observations to obtain an Arctic Ocean simulation that is in agreement with observations both within and beyond the optimization period and that can be used for tracer and process studies.
URL http://hdl.handle.net/10.1029/2010JC006573
Publication Type journal article
Record ID 65006386