末次盛冰期以来南海南部天然气水合物储库变化及其对环境的影响

末次盛冰期以来南海南部海平面及海洋底水温度均发生了很大的变化. 为了研究南海南部天然气水合物稳定带厚度在这个过程中的变化情况及其对环境的影响，我们利用相关的计算公式，并编制了计算稳定带厚度的程序，在南海南部的南沙海槽、曾母盆地、巴拉望盆地和苏禄海等四个重点海域选取了35个点进行末次盛冰期及目前稳定带厚度的计算. 计算结果表明，南海南部末次盛冰期和目前的天然气水合物稳定带厚度分别为262m和233m；甲烷资源量分别为269×1013m3和239×1013m3；水合物资源量分别为164×1011m3和146×1011m3. 这说明自末次盛冰期以来，南海南部稳定带厚度平均减薄了29m，平均减薄百分比为12%，同时释放了大约30×1012m3的甲烷，这些甲烷对环境产生了较大影响，对末次冰期的结束起了较大作用.

Change of gas hydrate reservoirs in the southern South China Sea from the Last Glacial Maximum to present and its effect on the environment

There has been a big change of the sea level and seabed water temperature since the Last Glacial Maximum (LGM) in southern South China Sea. In order to study the change of the thickness of gas hydrate stable zone and its effect on environment, 35 spots from four key areas in the southern South China Sea were selected to calculate it based on relative equation and program. The results show that the thickness of the gas hydrate stable zone are 262m and 233m, the methane resource quantity are 269×1013m3 and 239×1013m3, and the gas hydrate resource quantity are 164×1011m3 and 146×1011m3 in LGM and at present, respectively, indicating the thickness of the stable zone has reduced by 29m, i.e.12 percent on average and 30×1012m3 methane was released since LGM. This released methane should have greatly affected the environment and even terminated the ice age.