摘要
依据2013春、2016夏、2016秋三季在东印度洋中部开展的水体综合调查资料,研究东印度洋中部缺氧区(ρ_(DO)<2mg/L)的季节变化。结果表明:垂向分布上,缺氧区上边界一般位于水深100～150 m,厚度春季最厚、秋季次之、夏季最薄。平面分布上,春季缺氧区范围最大,主要位于89°00′E以东海区,其南端越过赤道向南扩展至1°12′S;夏季缺氧区的南端退缩至赤道以北海域,且分布面积最小;秋季缺氧区东西向的位置与春季相反,主要位于赤道91°00′E以西海域,其南向扩展范围可达赤道附近。从氧跃层强度来看,赤道附近氧跃层强度最强,由此向南、向北氧跃层强度逐渐减弱,与温跃层变化一致。研究表明,东印度洋中部缺氧区源于孟加拉湾缺氧区的南扩,季风性环流变化是缺氧区扩展范围季节变化的主要控制因素,有机碎屑的分解耗氧和高强度的水柱层化是缺氧区得以形成和维持的重要保障。
Based on the comprehensive survey data in spring,summer and autumn in 2013 and 2016,the seasonal variation of the hypoxic zone（ρDO〈2 mg/L）in the central East Indian Ocean is investigated.The results show that in the vertical profile,the upper of boundary the hypoxic zone is generally located between depth of 100～150 m,it is the thickest in spring,followed by the autumn,and the thinnest in summer.In the horizontal distribution,the area of hypoxic zone in spring is the largest,mainly located in the east of 89°E,and its southern boundary extends southward across the equator to 1.2°S.However,in summer,the boundary of hypoxic zone contracts to the north of the equator,with the smallest distribution area.The position of hypoxic zone is mainly located in the west of 91°E in autumn,which is just opposite to that in spring,and its southern boundary extends southward near the equator.The most intense oxycline is found near the equator,but it gradually weakens toward the north and the south,being consistent with that of the thermocline.The hypoxic zone in the central East Indian Ocean is derived from the southward extension of the hypoxic zone in the Bay of Bengal.The change of the monsoon circulation is the main driving force for the seasonal variation of the hypoxic zone,and the oxygen consumption of organic debris together with the intensive water column stratification are the important guarantee for the formation and maintenance of the hypoxic zone.
作者
王颖
王保栋
韦钦胜
孙霞
辛明
刘琳
WANG Ying;WANG Bao-dong;WEI Qin-sheng;SUN Xia;XIN Ming;LIU Lin(The First Institute of Oceanography,SOA,Qingdao 266061,China)
出处
《海洋科学进展》
CAS
CSCD
北大核心
2018年第2期262-271,共10页
Advances in Marine Science
基金
全球变化与海气相互作用专项--气候变化对大洋上层营养盐供给的影响(GASI-03-01-02-01)
关键词
东印度洋
缺氧区
季节变化
影响因素
East Indian Ocean
hypoxic zone
seasonal variation
influencing factor
