Depositional environment of the snow cover on West Antarctic pack-ice floes
Depositional environment of the snow cover on West Antarctic pack-ice floes
复制标题
南极西部浮冰积雪的沉积环境
作者：
M. Jeffries;A.L. Veazey;K. Morris;H. Krouse
1992年夏末，在东罗斯海、阿蒙森海和西别灵斯豪森海测量了南极浮冰积雪的深度、密度、负荷和同位素（δ18O）组成。雪密度值通常超过350 kg m-3，有些高达500 kg m-3。雪的致密化发生得很快，归因于多风的环境。浮冰上雪的高密度和有时相当深的积雪造成高达700公斤平方米的负荷，并导致海底海冰的海水泛滥。Ross/Amundsen海积雪较低的平均δ18O值表明该地区的气候可能比别令斯高森海地区更冷。别令斯豪森海地区浮冰的积雪深度比罗斯/阿蒙森海地区低，因为别令斯豪森海浮冰是一年冰。在长达2米深的雪的同位素剖面中，可能的年单位表明，罗斯/阿蒙森海地区的浮冰有2-3年的历史。
The depth, density, load and isotopic (δ18O) composition of the snow cover on pack-ice floes were measured in late austral summer 1992 in the eastern Ross, Amundsen and western Bellingshausen Seas. Snow-density values commonly exceeded 350 kg m-3 and some were as high as 500 kg m-3. The densification of the snow occurs quickly and is attributed to a windy environment. The high density and sometimes considerable depth of the snow on the floes accounts for loads of as much as 700 kg m-2 and resultant sea-water flooding of the underlying sea ice. Lower mean δ18O values in the Ross/Amundsen Seas snow cover suggest that the region might have a cooler climate than the Bellingshausen Sea region. Snow depths on floes in the Bellingshausen Sea region were lower than those in the Ross/Amundsen Seas region, because the Bellingshausen Sea floes were first-year ice. Possible annual units in the isotope profiles of snow, as much as 2m deep, indicate that floes in the Ross/Amundsen Seas region were 2-3 years old.