东海海水中的溶存甲烷
Dissolved methane in sea water of the East China Sea
-
摘要:
基于1994年秋季航次在东海的调查资料,较详细地分析了溶存甲烷在水体中的分布规律、成因和来源.表层水中溶存甲烷呈过饱和状态,饱和度127%～254%,温跃层以上水体中,甲烷的断面分布不同于营养盐的分布,各站测值相近,没有显示出受长江冲淡水的影响,而呈现的舌状分布,在陆架底层水中有明显的高浓度甲烷水体,表明甲烷从沉积物中迅速扩散进入底层水.黑潮次表层水的涌升过程稀释了陆架边缘底层水中的甲烷.在陆架和大洋区测站上,甲烷的垂直分布不同,前者主要受物理混合过程所控制;后者呈大洋区分布特征,在温跃层附近出现甲烷的次表层最大,这可能是陆架底层高浓度甲烷沿等密度面的输送所致.
Abstract:Based on our investigated data for the East China Sea in autumn 1991,the paper discusses the dissolved methane distribution features,formation mechanism, and sources of methane in sea water in detail.In the surface water, the dissolved methane is supersaturation and the saturation is 127%-259%.Above the thermocline,the sectional distribution of methane is different from the nutrient's.The values of each station are almost similar to each other.It is not shown that the tongue shaped distribution under the influence of the Changjiang diluted water.There is the higher concentrations in the bottom water and it is shown that the methane diffuses rapidly into the water from the sediments on the continental shelf.The upwelled process of the Kuroshio subsurface water dilutes the methane concentration in the bottom water on the shelf.The methane vertical profiles show various distributions on the shelf and open ocean.The former is mainly controlled by the physical mixing process.The later shows the open oceanic feature.There is the subsurface methane maximum around the thermocline.It is possible that the bottom water with higher methane on the shelf is transported along the isopycnal surface.
-
Key words:
- The East China Sea /
- dissolved methane /
- distribution /
- correlation /
- sources
-
Honghton J.Climate Change.The IPCC Scientific Assessment.Published by Cambridge University Press,London,1990,35-38 Etheridge D M,Peama G I,Fraser PJ.Changes in tropospheric methane between 1841 and 1978 from a high accumulation-rate Antarctic ice core.Tellus,1992,44B,282-294 Charlou J I,Bongault H,Aoriou P et al.Different TDM/CH4 hydrothermal plume signature; TAG site at 26°N and serpentinized ultrabasic diapir at 15°05'N on the Mid-Atlantic Ridge.Oeochemical et Cosmochimica Actu,1991,55.3 209-3 222 Scranton M I,Farrington J W.Methane production in the water of Walvis Bay.J.Geophys.Res.,1977,82.4 947-4 953 中村岳史,野民幸宏,大规晃等.东京湾海水中甲烷的浓度及其变动.地球化学(日文),1994,28,47-57 Scranton M I,Brener P G.Occurrence of methane in the near-surface waters of the subtropical North Atlantic.Deep-Sea Res.,1977.23,127-138 Ranger A,Burke T.Upper water column CH4 geochemistry in the eastern tropical North Pacific.Limnol.Oceanogr.,1983,28,19-32 Cynar F J,Yayanos A A.The distribution of CHA in the upper waters of southern California Bight.J.Geophys.Res.,1992.97.11 269~11285 Ward B B.The subsurface methane maximum in the southern California Bight.Continental Shelf Res.,1992,12,735-752 臧家业.动态式抽取、气相色谱法测定海水中的甲烷.黄渤海海洋,1996,14,33-39 Watanabe S,Higashitawi N,Tsurrshima N et al.Methane in the western North Pacific.Journal of Oceanography,1995,51,39-60 费尊乐.李宝华,黑田一纪.东海北部初级生产力.黑潮调查研究论文选(五),北京:海洋出版社,147-159 陆赛英,臧家业.东海北部海水中的若干净化特征.黑潮调查研究论文选(五),北京:海洋出版社,1993,93-105 Matsuno T,Kanari S,Kobayashi C et al.Vertical mixing in the bottom mixed layer near the continental shelf break in the East C',hina Sea.Journal of Oceanography,1994,50,437-448 Ivanor M Y.Biogeochemistry of Global change.Edited by Oremland R S,Published by Chapman and hall,New York,1993,505-573 Scranton M I,Partrick C,Angelis P L et al.The importance of episodic events in controlling the flux of rnethanc from an anoxic basin.Globai Giogeochemical Cycles,1993,7,491-507 Karisiddish S M,Veeragya M.Methane-bearing shallow gas-charged sediments in the eastern Arabian Sea:a probable source for greenhouse gas.Continental Shelf,Res.,1994,14,1 361-1 370 苗育田,于洪华.东海PN断面上黑潮水的入侵及其西边界的变动黑潮调查研究论文选(五),北京:海洋出版社,1993.242-252 -
计量
- 文章访问数: 952
- HTML全文浏览量: 22
- PDF下载量: 601
- 被引次数: 0
下载:
