南极普里兹湾的海水化学特征

THE CHEMICAL CHARATERISTICS OF SEAWATER IN THE PRYDZ BAY,ANTARCTICA

本文利用 1 989/1 990年度中国第六次南极考察期间所获得的调查资料 ,探讨了普里兹湾营养盐分布及其与生物生产力间的相互关系。结果表明 ,在艾默里冰架外侧存在大片温暖高盐水域 ,该水域真光层内营养盐含量较低 ,溶解氧饱和度高达 1 2 0 %,叶绿素 A含量大于 1 .0 0 mg/m3 ,表明了普里兹湾是南极高生产力区。化学要素垂直分布如温度一样出现了强跃层 ,并于3 5 0 m层出现了异常的营养盐垂直分布 ,但盐度无明显跃层存在。最后讨论了引起异常分布的原因。

Based on some data collected in the Sixth Southern Ocean Expedition of China during the year of 1989/1990. The relationship between the distribution of nutrients and productivity in the Prydz Bay has been discussed. The results show that outside the Emery ice shelf exists a large expand of warm and high nutrient content in the euphotic zone is relatively lower,the dissolved oxygen is up to 120% and the content of chlorophyll a is more than 1 00mg/m 3. All these show that Prydz Bay is a high productivity area in the Antarctica. The vertical distribution of chemical elements emerges a strong spring layer like temperature and abnormal vertical distribution of nutrient turns up at 350m layer. However,there is not almost obvious spring layer in salinity. Finally,the various factors causing abnormal distribution are discussed.