西太平洋暖池变异及其对西太平洋次表层海温场的影响   总被引：9，自引：0，他引：9  

陈锦年  何宜军  孙树远  许兰英  宋贵霆  张艳慧 《海洋学报》2002,24(3):35-44

应用热带太平洋上层XBT温度资料,分析研究了西太平洋暖池区(0°～16°N,125°～145°E)上层海洋的变化特征以及与西太平洋次表层海温场之间的关系.研究表明,西太平洋暖池区的垂向温度存在显著的年际变化,尤其在次表层(120～200m)的变化最为明显.西太平洋暖池区的次表层冷暖信号明显早于西太平洋次表层的海温异常.分析发现,西太平洋暖池区的海温异常是导致整个西太平洋次表层海温场变异的关键区,当西太平洋暖池区的次表层冷暖信号加强时,3～4个月后西太平洋海温场出现大范围的冷暖异常.  相似文献   

东太平洋地区DSDP573孔始新世末期的微玻璃陨石   总被引：5，自引：1，他引：5  

尹延鸿  万天丰  孙嘉诗 《海洋地质与第四纪地质》2001,21(4):37-42

通过研究 DSDP5 73孔的岩心样品 ,首次在该孔始新世与渐新世的界线地层含金属粘土层中发现了微玻璃陨石 ,且主要富集在其底部。一个样品 (5 g)中最多可达 12粒。这些微玻璃陨石主要呈球形、椭球形。用电子探针测试了其化学成分 ,Si O2 含量为 2 9.6 4%～ 5 8.93%,Al2 O3 为 3.42 %～ 2 0 .96 %,Fe O为 9.98%～ 2 9.5 5 %,Mg O为 4.32 %～ 16 .0 5 %,Ir为 0 .0 6 %～ 0 .81%。总体来说 ,微玻璃陨石的化学成分变化较大 ,可能与靶岩的成分变化较大有关。始新世末期北美微玻璃陨石场的展布方向约为 2 5 0°,这与太平洋板块运动方向改变所需要的矢量变化(2 45°)仅相差 5°,推测很可能是始新世末期陨星的撞击引起了太平洋板块在该时期的运动方向由 NNW突然变为NWW。  相似文献   

Atmospheric input of trace elements to the western Pacific Ocean and the Kuroshio ocean area     

Qian Fenlan  Yu Hongjian  Lan Youchang  Chen Zhi  Zhou Mingyu  Farn Parungo  Wu Peiming 《海洋学报(英文版)》1996,15(1):69-84

ＡｔｍｏｓｐｈｅｒｉｃｉｎｐｕｔｏｆｔｒａｃｅｅｌｅｍｅｎｔｓｔｏｔｈｅｗｅｓｔｅｒｎＰａｃｉｆｉｃＯｃｅａｎａｎｄｔｈｅＫｕｒｏｓｈｉｏｏｃｅａｎａｒｅａ￥ＱｉａｎＦｅｎｌａｎ；ＹｕＨｏｎｇｊｉａｎ；ＬａｎＹｏｕｃｈａｎｇ；ＣｈｅｎＺｈｉ；Ｚｈｏｕ...  相似文献   

热带太平洋-印度洋上层热含量年际变化的主模态   总被引：3，自引：0，他引：3  

武术  刘秦玉  胡瑞金 《中国海洋大学学报(自然科学版)》2007,37(3):365-371

利用多种海洋资料,采用经验正交函数分解(EOF)与合成分析等方法研究了热带太平洋-印度洋热含量年际变化的主要模态及其对应的转换过程。结果表明其第一模态对应El Nino事件成熟位相时的空间分布,即热带西太平洋和东印度洋为一冷中心,西南印度洋和赤道东太平洋为暖中心;第二模态对应着El Nino事件过渡期的空间分布,太平洋10°N附近以及赤道带为变化中心,而印度洋的变化中心主要在苏门答腊岛西部的赤道东印度洋海区。这2个模态基本刻画了ENSO循环过程中热带两大洋热含量变化的关键海区。利用合成分析结果与EOF分解结果的相似性,探讨了EOF分解前两个模态之间的转换过程,发现第一模态可能主要是通过海洋波动的传播过程调整到第二模态的,而第二模态还可以作为El Nino或La Nina事件的预报因子。此外,分析结果还表明,El Nino事件与La Nina事件对应的热含量变化并不是反对称的。  相似文献   

富钴结壳分布的分形特征   总被引：8，自引：0，他引：8  

何高文 《海洋地质与第四纪地质》2001,21(1):89-92

利用我国在西太平洋国际海底两个海山获得的富钴结壳资料进行分形研究后发现，富钴结壳的分布具有变维分形分布的特点，结壳丰度呈二阶累计和分形分布，结壳厚度呈多阶不定累计和分形分布，通过计算得到了它们各自的分维数，进而对两个海山的结壳资源进行了初步评价。  相似文献   

雄性三倍体长牡蛎繁殖潜力的初步研究   总被引：1，自引：0，他引：1  

丁君  张国范  常亚青  李霞  巩宁 《海洋科学》2001,25(9):55-57

国内外很多人做过三倍体长牡砺的诱导工作，但在三倍体性腺发育及配子活力方面的研究，目前仅见Ａｌｌｅｎ等１９８６年和１９９０年对三倍体的海螂和长蛎异常配子的发生报道。Ｃｏｘ１９９６年研究了悉尼岩牡蛎三倍体性腺发育情况，姜卫国等对三倍体合浦珠母贝的生殖腺进行了观察，李霞［１］对三倍体长牡蛎的性腺发育做了较系统的分析和总结。作者用流式细胞仪对长牡蛎Ｃｒａｓｓｏｓｔｒｅａ　ｇｉｇａｓ二、三倍体的性腺细胞进行了初步分析，回答了三倍体长牡蛎生殖潜力及性比方面的一些问题，为进一步研究三倍体长牡蛎的生长、繁殖、杂…  相似文献   

Excess CO2 and pHexcess in the Intermediate Water Layer of the Northwestern Pacific     

Andrey Andreev  Makio Honda  Yuichiro Kumamoto  Masashi Kusakabe  Akihiko Murata 《Journal of Oceanography》2001,57(2):177-188

Excess CO₂ and pH_excess showing an increase in dissolved inorganic carbon and a decrease in pH from the beginning of the industrial epoch (middle of the 19th century) until the present time have been calculated in the intermediate water layer of the northwestern Pacific and the Okhotsk Sea. It is concluded that: (1) The Kuril Basin (Okhotsk Sea) and the Bussol' Strait areas are characterized by the greatest concentrations of excess CO₂ at isopycnal surfaces due to the processes of formation and transformation of intermediate water mass. (2) The largest difference in excess CO₂ concentration between the Okhotsk Sea and the western subarctic Pacific (about 8 µmol/kg) is found at the = 27.0. (3) The difference in excess CO₂ between the western subarctic Pacific and subtropical regions is significant only in the upper part of the intermediate water layer ( = 26.7–27.0). (4) About 10% of the excess CO₂ accumulation in the subtropical north Pacific is determined by water exchange with the subarctic Pacific and the Okhotsk Sea.  相似文献   

北太平洋海面异常风场的时空分布特征与海气热量交换     

王志联  许乃猷  徐启春 《中国海洋大学学报(自然科学版)》1995,(1)

用北太平洋（含赤道太平洋区）１９４９～１９７９年的ＣＯＡＤＳ资料，通过矢量ＥＯＦ分解得到北太平洋异常风场的分布型及其时间变化规律。分析表明，ＥＯＦ１～５场与大气活动中心、海洋相互作用有联系，具有明显的天气学意义。此外，还讨论了ＥＯＦ异常风场间的转换及其季节性差异。  相似文献   

A Preliminary Study of Oceanic Bomb Radiocarbon Inventory in the North Pacific during the Last Two Decades     

Yutaka W. Watanabe  Tsuneo Ono  Koh Harada  Masao Fukasawa 《Journal of Oceanography》1999,55(6):705-716

Radiocarbon and total carbonate data were obtained near the 1973 GEOSECS stations in the North Pacific along 30°N and along 175°E between 1993 and 1994. In these stations, we estimated radiocarbon originating from atomic bomb tests using tritium, trichlorofluoromethane and silicate contents. The average penetration depth of bomb radiocarbon during the two decades has deepened from 900 m to 1300 m. Bomb radiocarbon inventories above the average value for the whole North Pacific were found widely in the western subtropical region around 30°N both in the 1970s and 1990s, and its area in the 1990s was broader than that in the 1970s. In most of the North Pacific, while the bomb radiocarbon has decreased above 25.4, the bomb radiocarbon flux below 25.4 was over 1 × 10¹² atom m^-2yr^-1 in the subtropical region around 30°N. In the tropical area south of 20°N, the bomb radiocarbon inventory below 25.4 increased from zero to over 10 × 10¹² atom m^-2 during the last three decades. These distributions suggest that the bomb radiocarbon removed from the surface is currently accumulated with bomb ¹⁴C flux of over 1 × 10¹² atom m^-2yr^-1 below 25.4 in the subtropical region, mainly by advection from the higher latitude, and that part of the accumulated bomb ¹⁴C gradually spread southward with about 30 years.  相似文献   

Management of the commons for biodiversity: lessons from the North Pacific   总被引：1，自引：0，他引：1  

Jerry McBeath   《Marine Policy》2004,28(6):580

The North Pacific has the world's largest groundfish fisheries, with a value in excess of $1 billion annually. The North Pacific also is home to the largest population of Steller sea lions (SSL), an ancient species that is now endangered. Decline of the western stock of SSL in the 1970–1990s coincided with the US nationalization and exponential growth in the Gulf of Alaska and Bering Sea/Aleutian Islands groundfish fishery.The article treats five aspects of the competition between the fishery and protection of the endangered species. First, we analyze competition of interests in the use, management, and preservation of the North Pacific commons, including offshore and near-shore fisheries, environmental organizations, governments (federal, state, and local), and the scientific community. Second, the article compares and contrasts provisions of the National Environmental Policy Act, the Marine Mammal Protection Act, the Endangered Species Act, and the Magnuson–Stevens Act (as amended in 1996 by the Sustainable Fisheries Act).Third, we examine the regulatory environment with a focus on the National Marine Fisheries Service (NMFS) and its relationship to the North Pacific Fishery Management Council. We illustrate how NMFS establishes fishery management plans and the methods, such as crafting biological opinions and environmental-impact-statements, it uses to resolve conflicts. Fourth, we investigate how the dual pressures on the agency—to increase fisheries production for the benefit of the industry and to preserve endangered marine species—have affected its culture (behavioral norms and operational codes). Then, the article explains agency changes in terms of crises, competition among affected interests, and development of new scientific knowledge.The article concludes by drawing lessons from the SSL controversy in the North Pacific which may pertain to national and global biodiversity conflicts. These concern the role of law in biodiversity protection, the role of science, and agency capacity for change.  相似文献