Title:
All about Arctic Ocean Sea Ice 北冰洋海冰的介紹、觀測與區域研究
All about Arctic Ocean Sea Ice 北冰洋海冰的介紹、觀測與區域研究
Time:
09/01 (Sat.) 7 pm PDT, 8 pm MDT, 9 pm CDT, 10 pm EDT
09/02 (Sun.) 10 am Taiwan
09/01 (Sat.) 7 pm PDT, 8 pm MDT, 9 pm CDT, 10 pm EDT
09/02 (Sun.) 10 am Taiwan
Keywords:
Oceanography, Physical Oceanography, Ocean Instability, Ice-Ocean Model
Oceanography, Physical Oceanography, Ocean Instability, Ice-Ocean Model
Abstract:
This study investigates the role of oceanic heat flux convergences in the summertime retreat of sea ice over the central Chukchi Sea. It is motivated by observations and preliminary numerical model results indicating that eddies generated along the marginal ice zone front carry substantial quantities of heat laterally beneath the ice. The lateral eddy heat flux is via intrusions of warm water into the pycnocline separating cold, dilute surface melt waters and near-freezing, salty bottom waters. This process is potentially important in heating the underside of the ice and thus enhancing summer ice melt and retreat. In addition, the mean summer currents in the Central Channel may be thermodynamically important in the summertime retreat of sea ice directly and, indirectly, as a source of the eddies to other portions of the shelf. We use the Regional Ocean Model System (ROMS) to: 1) determine the contributions to ice melt from the oceanic heat flux compare to that from the net air-sea heat flux into the ice surface; 2) evaluate the role of mesoscale fluctuations versus the mean background flow in providing this sub-surface heat flux; and 3) evaluate the role of bathymetry in modifying the subsurface heat flux to the ice.
This study investigates the role of oceanic heat flux convergences in the summertime retreat of sea ice over the central Chukchi Sea. It is motivated by observations and preliminary numerical model results indicating that eddies generated along the marginal ice zone front carry substantial quantities of heat laterally beneath the ice. The lateral eddy heat flux is via intrusions of warm water into the pycnocline separating cold, dilute surface melt waters and near-freezing, salty bottom waters. This process is potentially important in heating the underside of the ice and thus enhancing summer ice melt and retreat. In addition, the mean summer currents in the Central Channel may be thermodynamically important in the summertime retreat of sea ice directly and, indirectly, as a source of the eddies to other portions of the shelf. We use the Regional Ocean Model System (ROMS) to: 1) determine the contributions to ice melt from the oceanic heat flux compare to that from the net air-sea heat flux into the ice surface; 2) evaluate the role of mesoscale fluctuations versus the mean background flow in providing this sub-surface heat flux; and 3) evaluate the role of bathymetry in modifying the subsurface heat flux to the ice.
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