南海溶解氧的年际变化与El Nio

RELATIONSHIP OF THE YEARLY VARIATION OF THE DISSOLVED OXYGEN IN THE SOUTH CHINA SEA AND THE EL NINO

依据1975—1984年南海北部断面调查资料,对南海溶解氧的年际变化进行了分析,结果表明,南海溶解氧大致具有3—4年的变化周期,而这种变化周期与El Ni(?)o的振荡周期相一致。还发现,南海溶解氧在El Ni(?)o年的表现为低氧,与低温、低盐等相应;而介于两次El Ni(?)o年之间则为高氧,与高温、高盐等相应。作者对这一反常现象作了初步分析。

This paper analyses the annual variation of the dissolved oxygen in the South China Sea on the basins of the investigated profile data from 1975 to 1984 in the north South China Sea. The oxygen content is the biggest in 1980 and 1983, the smallest in 1981. The periodical variation of 3-4 years coincides with the oscillation period of El Niflo. Further more within the El Nifio period, the dissolved oxygen is low in the South China Sea, so are the temperature and salinity etc. This abnormal phenomenon is related to the increase of the precipitation on the coastal areas. The continual supplement of the deep layer water, which is of low temperature, and low oxygen content, along the continental shelf might be another key fator.