Modeling ocean-cryosphere interactions off the Adelie and George V Land coast
Modeling ocean-cryosphere interactions off the Adelie and George V Land coast
复制标题
对阿德利和乔治五世陆地海岸附近的海洋与冰冻圈相互作用进行建模
DOI：
10.1175/jcli-d-15-0808.1
复制
发表时间：
2017
影响因子：
4.9
通讯作者：
R. Massom and T. Tamura
中科院分区：
文献类型：
--
作者：
Kusahara;K.;H. Hasumi;A. D. Fraser;S. Aoki;K. Shimada;G. D. Williams;R. Massom and T. Tamura
利用一个耦合的海洋-海洋-冰架模型研究了沿阿德海和乔治五世陆地（AGVL）海岸的海洋-冰冻圈相互作用。默茨冰川舌（MGT）的主要特征位于东经145°左右，是一个高产的冬季沿海冰湖系统，直到2010年2月它的崩解极大地改变了该地区的“冰溢出”。本研究考察了海冰产量的年平均、季节和年际变化；MGT基底熔融；冰架、大冰山和坚冰；稠密陆架水（DSW）出口；以及底水性质对大陆斜坡和隆起的影响，并评估产犊事件的影响。冬季沿海多冰区年际变化主要受区域近海风和气温的影响，与阿蒙森海低压系统的活动有关。这是AGVL地区输出DSW年际变化的主要驱动因素。产犊事件导致海冰产量减少，导致DSW出口密度下降。随后，在大陆架和斜坡地区的下游有广泛的淡水化。此外，发现产冰事件导致MGT的平均融化速率显著降低，这是由于海洋环流变化导致进入空腔的海洋热通量减少所致。
Ocean–cryosphere interactions along the Adélie and George V Land (AGVL) coast are investigated using a coupled ocean–sea ice–ice shelf model. The dominant feature of the Mertz Glacier Tongue (MGT), located at approximately 145°E, was a highly productive winter coastal polynya system, until its calving in February 2010 dramatically changed the regional “icescape.” This study examines the annual mean, seasonal, and interannual variabilities of sea ice production; basal melting of the MGT; ice shelves, large icebergs, and fast ice; Dense Shelf Water (DSW) export; and bottom water properties on the continental slope and rise, and assesses the impacts of the calving event. The interannual variability of the winter coastal polynya regime is dominated by the regional offshore winds and air temperature, which are linked to activity of the Amundsen Sea low pressure system. This is the main driver of the interannual variability of DSW exported from the AGVL region. The calving event led to a decrease in sea ice production that resulted in a decrease in the density of DSW export. Subsequently, there is extensive freshening downstream over the continental shelf and slope regions. In addition, it is found that the calving event causes a significant decrease in the mean melt rate of the MGT, resulting from a decrease in ocean heat flux into the cavity due to ocean circulation changes.