<sup>234</sup>Th示踪法测定北太平洋西北海域冬季真光层中颗粒态有机碳输出通量

杨永亮; 韩旭; 日下部正志

²³⁴Th示踪法测定北太平洋西北海域冬季真光层中颗粒态有机碳输出通量

1.
国家地质实验测试中心, 北京, 100037
2.
青岛大学, 环境科学与工程系, 山东, 青岛, 266071
3.
日本放射线医学综合研究所, 那珂凑支所, 茨城, 237-0061;日本海洋科学技术中心, 横须贺, 237-0061

基金项目: 国家自然科学基金资助项目(40173027);日本高纬度海洋物质循环计划资助项目

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- 收稿日期: 2002-08-02
- 修回日期: 2003-11-06

Particulate organic carban fluxes from euphotic zone estimated with ²³⁴Th deficiency in winters in the northwestern North Pacific Ocean

1.
National Research Center for Geoanalysis, Beijing 100037, China
2.
Department of Environmental Science, Ocean University of China, Qingdao 266071, China
3.
Nakaminato Laboratory, National Institute of Radiological Sciences, 3609 Isozakicho, Hitachinaka 311-1202, Japan;Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan

摘要

摘要: 讨论了1997年冬季在北太平洋西北海域7个站位的表层至200m水深水柱中溶解及颗粒态²³⁴Th,颗粒态有机碳(POC)、氮(PON)及叶绿素a浓度的垂直分布剖面.溶解态、颗粒态及总的²³⁴Th的放射性在真光层中显著低于母体²³⁸U的放射性,总的²³⁴Th放射性在水深大于100m时趋于平衡.利用²³⁴Th-²³⁸U在海洋表层海水中的放射性不平衡推导出了北太平洋西北海域冬季真光层海水中²³⁴Th的平均停留时间和输出通量以及颗粒态有机碳和有机氮的输出通量.在亚北极环流区溶解态²³⁴Th的停留时间为40~50d,而在黑潮-亲潮共同影响区为20d左右.颗粒态有机碳和有机氮从真光层的输出通量范围分别为3.8~8.2和0.50~0.98mmol/(m²·d),西部海区高于东部海区,南部海区高于北部海区.在黑潮-亲潮共同影响区较高的颗粒态有机碳输出通量表明光照量及陆源营养盐物质的提供是两个决定生产力的主要因素.叶绿素a的水深分布和POC/PON的值同Redfield的比值的一致性表明这个海区的冬季颗粒物主要由浮游植物构成.北太平洋西北海域在冬季的颗粒有机碳输出通量可高于世界大洋一些海区春、夏季的颗粒有机碳输出通量.
- ²³⁴Th /
- 北太平洋 /
- 有机碳 /
- 有机氮 /
- 输出生产力
Abstract: Dissolved and particulate ²³⁴Th,particulate organic carbon (POC),particulate organic nitrogen (POC),and chlorophyll a concentrations in the upper 200 m of water columns from seven stations in the northw estern North Pacific Ocean were determined in the winter of 1997.The dissolved,particulate,and total ²³⁴Th activities (dissolved plus particulate) show a pronounced deficiency with respect to its parent ²³⁸U in the euphotic zone whereas the total ²³⁴Th shows near-equilibrium at the depth greater than 100 m.The ²³⁴Th data were used to derive the fluxes of particulate organic carbon and nitrogen output of the euphotic zone.The POC and PON fluxes range from 3.8 to 8.2 and 0.50 to 0.98 mmol/(m2·d),respectively,and are higher in the west region than in the east,and higher in the south than in the north.The co-influence of Kuroshio-Oyashio Currents with supply of substances from the coast area to the study area and the light condition are two factors determining the horizontal distribution of POC fluxes in winter.The depth distribution of the chlorophylla as well as the consistence of the ratio of POC to PON with the Redfield ratio suggest that phytoplankton is themain contributor to the export of POC in this area in winter.The POC fluxes in the northw estern North Pacific Ocean in winter are comparable to some areas in the world oceas in spring and summer seasons.
- ²³⁴Th /
- particulate organic carbon /
- particulate organicn itrogen /
- export production /
- northw estern North Pacific

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参考文献(33)

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²³⁴Th示踪法测定北太平洋西北海域冬季真光层中颗粒态有机碳输出通量

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Particulate organic carban fluxes from euphotic zone estimated with ²³⁴Th deficiency in winters in the northwestern North Pacific Ocean

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234Th示踪法测定北太平洋西北海域冬季真光层中颗粒态有机碳输出通量

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Particulate organic carban fluxes from euphotic zone estimated with 234Th deficiency in winters in the northwestern North Pacific Ocean

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出版历程

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²³⁴Th示踪法测定北太平洋西北海域冬季真光层中颗粒态有机碳输出通量

Particulate organic carban fluxes from euphotic zone estimated with ²³⁴Th deficiency in winters in the northwestern North Pacific Ocean