南极普里兹湾邻近海域海冰生消发展特征分析  

The Characteristic of Sea Ice Growth and Melt in the Prydz Bay Region,Antarctica

作　　者：郑少军[1] 史久新[1] 

机构地区：[1]中国海洋大学教育部物理海洋学重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2011年第7期9-16,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40676011);国家科技支撑计划项目(2006BAB18B02);教育部新世纪优秀人才支持计划项目(NCET-10-0720)资助

摘　　要：利用美国冰雪数据中心发布的2003—2008年高分辨率海冰密集度数据,分6个阶段对普里兹湾区域海冰季节性变化的空间分布特征进行了研究,并根据普里兹湾海区的地形和环流对这些特征的成因进行了分析。结果表明,普里兹湾海冰冻结过程和融化过程分别经历7个月和5个月,海冰融化速度最快月份是10月和11月,主要表现形式为海冰密集度的减少;海冰冻结速度4月和6月最快,海冰外缘线向北扩展。由于普里兹湾近岸达恩利角冰间湖、普里兹湾冰间湖和Barrier湾冰间湖的存在,海冰的融化呈现大洋区由北向南、近岸区由南向北的双向融化特征;而在普里兹湾口、弗拉姆浅滩和四女士浅滩均存在不易融化的冰舌,两者之间的低密集度海冰区,则对应于暖水侵入普里兹湾的通道。南极绕极流在流经凯尔盖朗海台中部时向北偏转,造成此处在盛冰期较其它经度的海冰外缘更靠北,可达57°S。南极辐散带的表层流场和上升暖流抑制海冰冻结和聚集,形成了低海冰密集度区域。The spatial distribution character of sea ice in different seasons divided by 6 periods in the Prydz Bay were studied,by using high resolution ice concentration data from 2003 to 2008 year,which provided by the National Snow and Ice Data Center,at the same time its causation was analyzed according to the bathymetry and circulation of Prydz Bay region.The result indicated that the freezing and thawing stages went through 7 months and 5 months separately,the fastest months of sea ice thawing were October and November,mainly from the decrease of sea ice concentration;the fastest months of sea ice freezing were April and June,mainly from the expending of sea ice edge.In the melting period,sea ice had the bidirectional melting character for the existent of Cape Darnley polynyas,Prydz Bay polynyas and Barrier Bay polynyas in the coast of the Prydz Bay,namely sea ice melt from north to south in abyssal ocean,and melt from north to south in the coast region of Prydz Bay.There were persistent ice tongues north of Cape Darnley and Four Ladies Bank,and the low sea ice concentration region between them was corresponding to the path of warm water intruding to the Prydz Bay.The Antarctic Circumpolar Current turned north when flowing by the Kerguelen Plateau,and made sea ice edge more north in winter time than that in the same longitude,which could reach 57°S.The divergent surface flow field of the Antarctic Divergence and upwelling warm current could restrict sea ice freezing and congregating,and formed low sea ice concentration region.

关 键 词：海冰 海冰生消发展 普里兹湾 南极 

分 类 号：P728.2[天文地球—海洋科学]