Sustainable observations of landfast sea ice in the cryosphere:a case study at the Liaodong Bay,Bohai Sea,North China  

作　　者：MA Yuxian WANG Qingkai LIU Xueqin LI Wei XU Ning Bin CHENG 

机构地区：[1]National Marine Environmental Monitoring Center,Dalian 116023,China [2]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China [3]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [4]Finnish Meteorological Institute(FMI),Helsinki FI-00101,Finland

出　　处：《Advances in Polar Science》2024年第4期459-472,共14页极地科学进展（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant nos.42206221 and 42077445);Academy of Finland under contract 31799.

摘　　要：Sustainable monitoring of sea ice is crucial for better understanding air-ice-ocean interactions and identifying new processes.However,it is an expensive process particularly for the polar cryosphere environment.The seasonal ice-covered sea area can be used as a test bed for cryosphere-related process studies due to convenient access and conduction of field work,and the seasonal regime variation of the Arctic sea ice resulting from climate changes.In this paper,a small landfast sea ice monitoring program has been carried out for four consecutive seasons at Jiangjunshi Port,the Bohai Sea,North China,analyzing the temperature and salinity of air,ice and ocean and discussing the influence on mechanical properties.The effect of air temperature on sea ice temperature is focused.During low-temperature periods,the maximum correlation coefficient between air temperature and ice temperature,along with temperature fluctuation within ice,decreases as ice depth increases.Ice salinity was measured using ice core sampling and ice crumb sampling,with ice crumb salinity twice larger compared to ice core sampling when the ice temperature is−3℃.Ice salinity variations with ice temperature and the salinity profiles were fitted.Analysis of the profiles of under-ice seawater salinity reveals the presence of a high-salinity layer near the bottom of sea ice during the initial stage of sea ice growth.Based on the dynamic changes in sea ice temperature and sea ice salinity,this study evaluates the mechanical properties of sea ice,with the fitting determination coefficients of the obtained parameterized formulas significantly better than those reported in current research.

关 键 词：seasonal sea ice thermodynamic observations sea ice temperature sea ice salinity uniaxial compressive strength 

分 类 号：P714.1[天文地球—海洋科学] P731.15