潮汐对瞬态气候响应模拟的影响研究     

于溢  刘海龙  林鹏飞  兰健 《海洋学报(英文版)》2020,39(1):52-62

In this study, the impact of oceanic processes on the sensitivity of transient climate change is investigated using two sets of coupled experiments with and without tidal forcing, which are termed Exp_Tide and Exp_Control,respectively. After introducing tidal forcing, the transient climate response(TCR) decreases from 2.32 K to 1.90 K,and the surface air temperature warming at high latitudes decreases by 29%. Large ocean heat uptake efficiency and heat storage can explain the low TCR in Exp_Tide. Approximately 21% more heat is stored in the ocean in Exp_Tide(1.10×10~(24) J) than in Exp_Control(0.91×10~(24) J). Most of the large ocean warming occurs in the upper 1 000 m between 60°S and 60°N, primarily in the Atlantic and Southern Oceans. This ocean warming is closely related to the Atlantic Meridional Overturning Circulation(AMOC). The initial transport at mid-and high latitudes and the decline in the AMOC observed in Exp_Tide are both larger than those observed in Exp_Control. The spatial structures of AMOC are also different with and without tidal forcing in present experiments. The AMOC in Exp_Tide has a large northward extension. We also investigated the relationship between AMOC and TCR suggested by previous studies using the present experiments.  相似文献   

Elemental geochemical records of seafloor hydrothermal activities in the sediments from the Okinawa Trough     

ZHAI Shikui  YU Zenghui  DU Tongjun 《海洋学报(英文版)》2007,26(4):53-62

The major and minor element contents in the sediment core H9 from the hydrothermal fields of the Okinawa Trough show a sharp change at the depth of 80 cm. The elements enriched in the upper 80 cm core are those enriched in the hydrothermal deposits and in the surface sediments recovered from the hydrothermal fields in the trough, which indicates the input of hydrothermal materials. Comparing with other hydrothermal sediments from Mid-ocean Ridges or the Lau Basin, the degree of the enrichment of elements iron, copper,cobalt, and nickel is relatively low. However, the enrichment of elements manganese, lead, arsenic, antimony and mercury is remarkable. The average contents of these elements in the upper 80 cm core sediments are three to six times those in the lower section, and 3~12 times those in the surface sediments which are not influenced by hydrothermal activities. Hydrothermal activities have contributed significant manganese, lead, arsenic, antimony and mercury to the sediments, and these elements are distinct indicators for the hydrothermal activity in the Okinawa Trough. The significant enrichment of these elements in Core H9 upward from the depth 80 cm indicates the start or the significant enhancing of the hydrothermal activity in this area at about 5 740 aB.P. The average accumulation rate of manganese during this period is about 40 461 μg/(cm2·ka), which is similar to the hydrothermal sediments in the Lau Basin or the East Pacific Rise.  相似文献   

南极生物热耐受性:热极限的进化和适应性调节     

石红旗 《海洋科学进展》2005,23(Z1):86-89

温室效应和全球气候变化已经影响到南、北极地区,极地气温升高对于极地生物链的基础部分产生巨大影响.南极生物链中的关键初级生产力是微藻,南极冰藻是极好的生态指示种.南极冰藻在高于生长适宜温度下生长受到抑制,抵抗高温胁迫的机制和能力制约着南极冰藻的生存,南极冰藻生存威胁到极地生态的生物多样性和极地生物链的完整性.持续低温环境进化过程对极端适冷微藻热适应机理的影响是理解极地气候变化对南极冰藻生态影响的依据.  相似文献   

日本对虾仔虾呼吸和排泄的初步研究   总被引：3，自引：0，他引：3  

朱小明  吴荔生  马志勇  李少菁 《台湾海峡》2001,20(1):37-42

本文采用水瓶法和径流装置研究了不同温度下摄食和饥饿的日本对虾（Penaeus japonicus)仔虾（P）的呼吸与排泄。结果表明，日本对虾仔虾体长与干体重呈指数函数关系，DW＝0．006e^0.515L(r^2=0.999,n=16)；耗氧和氨排泄率随着温度的升高而提高、随着仔虾体重的增长反而变小；耗氧和氨排泄率与体重呈幂函数关系，30和26℃下耗氧率（R）与体重的关系方程式分别是R＝2.669DW^-1.041(r^2=0.953,n=8)和R=2.370DW^-0.708,(r^2=0.533,n=8)，30和26℃下氨排泄率（E）与体重的关系方程式分别是E＝36.81DW^-0.615(r^2=0.654,n=8) 和E＝15．28DW^-0.795(r^2=0.652,n=8）；饱食仔虾的耗氧率明显高于饥饿的仔虾，因摄食使仔虾（P15）额外消耗的能量为4％－20％，仔虾的特殊动力作用（SDA）大约在摄食5－7h后发生，并可持续作用10h左右。  相似文献   

长江中下游6月份降水的一个预报指标     

赵永平  陈永利 《海洋科学》1995,19(1):39-42

根据１９６３－１９９２年嵊山海洋站２月海气感热输送和２２ａ太阳磁周期与降水的关系，提出了一个长江中下游６月降水的综合预报指标，用此指标，对１９９３年６月长江中下游降水进行回报，结果与实况一致。  相似文献   

反厄尔尼诺事件的个例分析     

李若钝  邹娥梅 《热带海洋》1993,12(2):9-16

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海洋藻类--对付全球变暖的武器?     

江茹 《海洋信息》2002,(4):31-31

最近,由欧盟(则资助的研究项目(Parforce)研究人员发现了海洋藻类与气候变化之间的联系。项目研究人员发现,从海洋藻类及浮游生物释放的碘蒸汽,在海面上浓缩,形成对抗地球变暖的悬浮微粒。此悬浮微粒对地球气候变化及降  相似文献   

一种现场连续取样的水中微粒采集装置     

廉双喜 《海洋技术学报》1990,9(4):43-49

这里介绍的西德基尔大学应用物理所研制的现场水中微粒采集装置,最大工作深度1km,一次投放可采集800个样品,供海水的生物、矿物、悬浮物、沉积物及化学方面的定量分析,该装置在水下进行泵汲取样、网膜过滤和塑料热焊封存,提出水面后用显微镜观察和分析,用计算机数据处理,可获得各种微粒的时空分布曲线.这种水中微粒采集方法是海水采样技术发展史上的一次革新,值得我们在研制采水设备时参考。  相似文献   

ENSO与热带西北太平洋海洋上层热含量及副热带高压变异的关系     

林俊兰 《海洋学研究》1990,8(2):7-14

本文使用谱分析法,分析了ENSO与热带西北太平洋海洋上层热含量和副热带高压的多年变化及其相互关系。文中以南方涛动指数(SOI)距平表征ENSO,以海面至100m水层的平均温度(Tav)代表上层热含量,以Tav>27℃网格数(HC)的季距平代表热含量的变化,以西太平洋副热带高压的面积指数(ST)表示其多年变化。分析结果表明,这三个时间序列的持续性良好,它们有相似的自振韵律和一个共同的谱峰,主要振荡周期均为3～4a。交叉谱分析表明,在这一振荡周期上,这些时间序列有较高的凝聚,且SOI和HC同相,而HC和ST反相变化,即SOI为负距平时,HC也为负距平,而ST为正距平,SOI先于HC两个月,而HC先于ST6个月左右。  相似文献   

西南日本俯冲带的热状态“俯冲板块年龄史的影响     

Wang.  K 戴佩君 《海洋地质译丛》1996,(2):47-58

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