西南印度洋龙方斤热液区羽流信号的检测与通量估算

doi:10.3969/j.issn.1001-909X.2015.04.005

海洋学研究 ›› 2015, Vol. 33 ›› Issue (4): 43-52.DOI: 10.3969/j.issn.1001-909X.2015.04.005

西南印度洋龙方斤热液区羽流信号的检测与通量估算

陈小丹^1,2, 梁楚进^*1,2, 董昌明^3,4

1.卫星海洋环境动力学国家重点实验室,浙江杭州 310012;
2.国家海洋局第二海洋研究所,浙江杭州 310012;
3.南京信息工程大学海洋科学学院,江苏南京 210044;
4.地球与行星物理研究所, 美国加州大学洛杉矶分校,美国加利福尼亚州洛杉矶 90095

收稿日期:2015-02-02 修回日期:2015-05-26 出版日期:2015-12-15 发布日期:2022-11-28
通讯作者: *梁楚进(1966-),男,研究员,主要从事物理海洋方面的研究。E-mail:cjliang@sio.org.cn
作者简介:陈小丹(1989-),女,浙江台州市人,主要从事物理海洋方面的研究。E-mail:xiaodanchen2014@163.com
基金资助:
国家重点基础研究发展计划项目资助(2012CB417303);全球变化与海气相互作用专项项目资助(GASI-03-01-01-07)

Detection and flux estimation of hydrothermal plumes in the Longqi hydrothermal field in the Southwest Indian Ocean

CHEN Xiao-dan ^1,2, LIANG Chu-jin^*1,2, DONG Chang-ming ^3,4

1. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;
2. The Second Institute of Oceanography, SOA, Hangzhou 310012, China;
3. School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;
4. Institute of Geophysics and Planetary Physics, University of California, Los Angeles CA 90095, USA

Received:2015-02-02 Revised:2015-05-26 Online:2015-12-15 Published:2022-11-28

摘要/Abstract

摘要： 热液流体在物理化学特征方面与周围海水存在较大差异,探测温度异常和浊度异常是寻找热液羽状流信号的重要手段。本文采用“大洋一号”科考船第20航次的拖曳CTD数据和浊度数据,以及21航次的定点CTD数据,研究了西南印度洋龙方斤热液区的温度异常和浊度异常现象。研究表明热液区中性浮力层在水深2 550~2 650 m间,厚度约为100 m,温度异常达0.01 ℃;水深 2 750~2 800 m间亦有温度异常,最大可达0.08 ℃;温度异常水深处存在相应的浊度异常。深层背景海水位温和位密间存在简单线性关系。此外,经初步估计,热液活动区初始浮力通量为8.78×10^-4 m⁴/s³;通过中性浮力层估算热液热通量,约为130±43 MW。

关键词: 西南印度洋, 热液羽流, 温度异常, 浊度异常, 热通量

Abstract: Compared with the surrounding seawater, hydrothermal fluid has big differences in both physical and chemical characteristics. Detecting abnormal temperature and turbidity are important means for finding hydrothermal plumes signal. The towing CTD and the turbidity data from leg 20 and the CTD station data from leg 21 of “DaYang Yi Hao” expedition ship were studied. A neutral buoyancy level at the depth of 2 550~2 650 meters with a temperature anomaly about 0.01 degree, and the thickness about 100 meters is found in a hydrothermal field at 49.65°E in the Southwest Indian Ocean. It also shows that temperature anomaly appears at the depth of 2 750~2 800 meters, with the maximum value to 0.08 degree. Accompanied by temperature anomaly, turbidity anomaly also occurres at the same water levels. The potential temperature of background water shows a linear correlation with the potential density in the deep sea. In addition, it is estimated that the initial buoyancy flux is 8.78×10^-4 m⁴/s³, and the estimation value of the hydrothermal area heat flux is about 130±43 MW calculated from the neutral buoyancy level.

Key words: Southwest Indian Ocean, hydrothermal plumes, temperature anomaly, turbidity anomaly, heat flux

中图分类号:

P738.6

陈小丹, 梁楚进, 董昌明. 西南印度洋龙方斤热液区羽流信号的检测与通量估算[J]. 海洋学研究, 2015, 33(4): 43-52.

CHEN Xiao-dan , LIANG Chu-jin, DONG Chang-ming. Detection and flux estimation of hydrothermal plumes in the Longqi hydrothermal field in the Southwest Indian Ocean[J]. Journal of Marine Sciences, 2015, 33(4): 43-52.

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西南印度洋龙方斤热液区羽流信号的检测与通量估算

Detection and flux estimation of hydrothermal plumes in the Longqi hydrothermal field in the Southwest Indian Ocean

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