基于IceBridge数据的南极别林斯高晋海的海冰厚度研究

Sea ice thickness research in the Bellingshausen Sea from IceBridge

海冰变化与全球气候、生态系统和人类活动密切相关,海冰厚度是海冰变化研究的重要参数之一。全面立体高精度观测海冰厚度的最有效手段是航空遥感,而冰桥计划(IceBridge)是当前南北极最大的航空遥感工程。基于2009-2014年冰桥计划的激光雷达高程数据和数字测图系统相机光学影像对南极别林斯高晋海的海冰厚度进行研究,并结合降雪量等气象数据探讨该区域海冰厚度变化的原因。研究发现该海域的海冰厚度在2009-2014年间整体呈微弱增长趋势(0.07m·a-1),但是在95%置信水平下不具有显著性。2009-2011年呈现先增加后减少的大幅度变化,其中2010年达到极大值2.42m,之后开始缓慢增加。海冰厚度的年际变化与降雪和近地表温度等气象要素相关,二者相比较而言降雪为主要影响因素。

Sea ice changes are closely related to global and regional climate. Sea ice thickness is one of the important parameters for sea ice change research. Aerial remote sensing is the most effective method for comprehensive and high-precision observation of sea ice thickness. And IceBridge is currently the largest aerial remote sensing project in the Arctic and Antarctic. Sea ice thickness of Bellingshausen Sea in Antarctic was used to study from IceBridge ATM elevation data and DMS optical images in2009-2014. Furthermore,combined with meteorological data such as precipitation,the reasons for the variations of sea ice thickness in this area are discussed. The study found that the sea ice thickness in the sea area showed an overall slight increasing trend(0.07 m·a-1),but it is insignificant at the95% confidence level. In2009-2011,there was a sharp change that first increased and then decreased. In2010,it reached a maximum value of2.42 m,and then it began to increase slowly. The interannual variation of sea ice thickness is related to meteorological factors such as precipitation and near-surface temperature. In contrast,precipitation is the main influencing factor.