东南极洲中山站附近1年生海冰的发育和结构特征及其对生物群落的影响
- 出版年：1998
- 作者：何剑锋；陈波；吴康
- 单位1：Polar Research Institvte of China
- 语种：英文
- 作者关键词：East Antarctica；fast ice；sea ice structure；ice fabric；ice a1gal biomass
- 起始页：358
- 总页数：10
- 刊名：冰川冻土
- 是否内版：否
- 刊频：季刊
- 创刊时间：1979
- 主办单位：中国地理学会中国科学院兰州冰川冻土研究所
- 主编：黄茂桓
- 地址：兰洲市东岗西路260号
- 邮编：730000
- 卷：20
- 期：4
- 核心期刊：中国自然科学核心期刊
摘要
Sea ice growth, characteristics and ice algal biomass were measured at four sites offZhongshan Station (66°22'24“ S, 76°22'40” E), East Antarctica in 1992. The ice formed in late March,grew stable1y and reached its higbest thickness of 174 cm in November and December. The differencebetwween measured ice thickness and the calculated va1ues from the classical Stephen formula are small,suggesting that the heat flux from the ocean to the underside of the ice at this area is not obvious. The results of sea ice analysis show that the sea ice consists mainly of congelation ice, and the frazilice only occurs at the top of sea ice, no snow or platelet ice is found. When the ice thickness reached itshighest values in late spring, congelation ice contained average 89.5% of the total column crystal struc-ture, the remaining 105％consisted of frazil ice, and the ice thicknesses above the congelation ice 1ay-ers were mostly consistent throughout the year, suggesting that the sea ice developed in a relativelycalm environment after the top layer of ice had formed and grew downwards only， Congelation ice fabrics shows fequent moderate to strong alignments at almost all depths, and thedegree of preferred orientation mosty increased with depths. In the sub-structure of congelation ice,the plate width are in a range of 0.55 to 1.05mm with an average value of 0.76 mm. No apparent pat-tern occurs in its vertical profiles. Ice crystal composition is one of the major factors influencing the ice algal biomass，and the effectsof crysta1 alignments and ice plate width of congelation ice are not apparent.