摘要
南极冰层的冰量为２４．５×１０６ｋｍ３，占地球总冰量的９０％以上，南极冰川进退控制着全球海平面变化和气候波动。酉部南极乔治王岛第四纪冰碛与湖积剖面记录了近１２０００ａ来南极曾于距今１１０００ａ，９０００ａ和６１００ａ出现过３次快速的冰消过程，近６０００ａ来是一小幅度冷暖交替的气候波动过程。深圳湾北岸潮间带堆积是在近６０００ａ以来发育的，堆积物的环境记录表明，海平面呈周期性升降变化，波动周期平均为６７０ａ，低海面时期发生于距今５５００—４９００ａ，３９００—３６００ａ，２４００—２２００ａ和１３００—１２００ａ。相邻低海面间则是海面上升时期，每一升降周期的海平面变化幅度为８０ｃｍ左右，近１００ａ的现代增温，海平面处于上升阶段，上升速率为２—３ｍｍ·ａ（－１）。
he Antartic has an ice amout of 24.5 ×106km3,occupying more than 90% of the global ice volume. The glacial advances and retreats in the Antartic area have been controlling global sea level changes and climatic fluctuations. Glacial and lacustrine deposits in Quaternary stratigraphic sections at King George Island in the western part of Antartic recorded clearly 3 rapid glacial retreats in 11 000, 9 000 and 6 100 a B. P. respectively and a climatic fluctuation process with a little amplitude in the last 6 000 years. Located at the northern bank of Shenzhen Bay,the intertidal deposits recording environmental information were best developed in the last 6 000 years, suggesting that there was a periodic rise and fall variation in the sea level with cyclical intervals of about 670 years.Lower levels occurred in 5 500-4 900, 3 900-3 600, 2 400-2 200 and 1 300-1 200 a B. P., and intervals between the lower levels were rising periods which had an amplitude of about 80cm per cycle. The modern warming in the last 100 years is a rising interval with a rate of 2-3 mm. a-1.
出处
《热带海洋》
CSCD
1996年第4期1-8,共8页
基金
国家重点南极科技攻关
广东省自然科学基金
关键词
潮间带堆积物
海平面变化
全新世
冰退
南极
intertidal deposits,sea level change,Holocene, Antartic, glacial retreats,northern bank of Shenzhen Bay
