HR: 0800h
AN: C41B-0204    [Abstracts]
TI: Arctic and Antarctic Ice Pack Changes during the Past Decade from a High Resolution Global Coupled Sea Ice-Ocean Model
AU: * Ivanova, D P
EM: dpivanov@nps.edu
AF: Naval Postgraduate School, Code OC/Ia, Monterey, CA 94943 United States
AU: McClean, J L
EM: mcclean@nps.edu
AF: Naval Postgraduate School, Code OC/Ia, Monterey, CA 94943 United States
AU: Thoppil, P
EM: prasad@nps.edu
AF: Naval Postgraduate School, Code OC/Ia, Monterey, CA 94943 United States
AU: Hunke, E
EM: eclare@lanl.gov
AF: Los Alamos National Laboratory, MS B216, Los Alamos, NM 87545 United States
AU: Stark, D
EM: drstark@nps.edu
AF: Naval Postgraduate School, Code OC/Ia, Monterey, CA 94943 United States
AU: Maltrud, M E
EM: maltrud@nps.edu
AF: Los Alamos National Laboratory, MS B216, Los Alamos, NM 87545 United States
AU: Lipscomb, W
EM: lipscomb@lanl.gov
AF: Los Alamos National Laboratory, MS B216, Los Alamos, NM 87545 United States
AB: Changes over the past decade in the global ice pack are analyzed using a coupled ice-ocean model and observational data sets. The model consists of the latest versions of the Los Alamos Parallel Ocean Program (POP) and sea ice model (CICE) and is configured on a moderately high-resolution global grid (0.4$\deg$ and 40 vertical levels). A model simulation forced with high frequency daily NCEP/NCAR atmospheric fields was integrated for 23 years (1979-2002). Following a decade-long ice spin-up, the model's ability to reproduce observed ice extent, ice thickness and ice drift distributions is evaluated by statistical comparisons using satellite, upward looking sonar and ice drift buoy data. In particular, the realism of the ice mean state and variability on time scales from daily to interannual are examined. To better understand ocean-ice interaction processes, coupled model results are compared to stand alone integrations of the ice and ocean models. Mean ice states are examined during the positive/negative phases of the North Atlantic Oscillation and Arctic Oscillation in the last decade of the coupled simulation. Particularly ice export from the Fram and Bering Straits during these phases will be considered.
DE: 9315 Arctic region
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 4207 Arctic and Antarctic oceanography
DE: 4215 Climate and interannual variability (3309)
DE: 4540 Ice mechanics and air/sea/ice exchange processes
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting