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The Influence Of Tides On Ocean-ice Shelf Interaction Beneath Pine Island Glacier In West Antarctic

Posted on:2018-08-27Degree:MasterType:Thesis
Country:ChinaCandidate:Y F ChenFull Text:PDF
GTID:2310330518998134Subject:Marine meteorology
Abstract/Summary:PDF Full Text Request
A regional ocean model configured from the Massachusetts Institute of Technology general circulation for the Pine Island Bay region, Amundsen Sea, West Antarctic was used to study the influence of tides on the circulation in the ocean-ice shelf coupled system. The model has a horizontal resolution of 1 km and 70 levels in the vertical direction. The ice shelf and its cavity is also represented in the model using partial grid cell techniques. Two sets of numerical experiments were used for two different stratifications with and without tides. Total four numerical experiments were conducted with a typical integration time as 10 days because of limited computing resources. The model domain is located in the Amundsen Sea and derived from the global cube sphere grid configuration used by the Estimating the Circulation and Climate of the Ocean, Phase 2 (ECC02) project.The tides in the Pine Island Glacier region are dominated by diurnal constituents,with amplitude of K1 around 30-40 cm. The tidal boundary condition is added to the regional MITgcm for the Pine Island Bay region. The barotropic transport from CATS2008b (Circum-Antarctic Tidal Simulation, 2008) is used along the boundaries of the MITgcm. Observations from five stations around PIG were used to assets the accuracy of model tidal solution. The results indicated that the total discrepancy between model tidal solution and observation is around 11 cm, which includes discrepancy in both tidal amplitude and phase.Two sets of numerical experiments with different stratification with and without tides were conducted to illuminate the influence on the circulation around and under the ice shelf. In one set of experiments (exp1), the horizontally uniform stratification from CTD observation from a field experiments. In another set of experiments(exp2), those dimensional stratifications from ECC02 is used. Comparing with model outputs with and without tides, the heat transport into the ice shelf cavity is increased by 17.4% and 6.2% in expl and exp2, respectively. Model output is also comparable with a CTD observation for 24hr in terms of general features.
Keywords/Search Tags:Tides, West Antarctic, Pine Island Glacier, Ocean-Ice shelf coupled system, MITgcm
PDF Full Text Request
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