极地研究

极地研究 ›› 2012, Vol. 24 ›› Issue (1): 24-34.DOI: 10.3724/SP.J.1084.2012.00024

• 研究论文 • 上一篇    下一篇

北极加拿大海盆2003年和2008年上层海洋热含量的差异分析

钟文理1,2,赵进平1,2   

  1. 1. 中国海洋大学海洋环境学院
    2. 教育部物理海洋学重点实验室
  • 收稿日期:2011-08-23 修回日期:2011-11-09 出版日期:2012-03-30 发布日期:2012-03-30
  • 通讯作者: 钟文理
  • 基金资助:

    全球变化研究国家重大科学研究计划项目和国家自然科学基金重点项目“北极环极边界流的结构及其对气候变化贡献的研究”

Variation of upper-ocean heat content in the Canada Basin in summers of 2003 and 2008

  • Received:2011-08-23 Revised:2011-11-09 Online:2012-03-30 Published:2012-03-30
  • Supported by:

    Global Change Research Program of China and the National Natural Science Foundation of China via project “Arctic circumpolar current structure and its contribution to the climate change”

PDF (PC)

1694

被引次数

9

摘要：

主要利用2003年和2008年两次夏季北极科学考察的CTD数据处理了加拿大海盆上层海洋的热含量(这里上层海洋指的是200m以上的海洋)，定量分析了热含量随深度的变化，并比较分析了这两年在夏季海冰融化期间热含量的垂向差异变化，以及影响热含量变化的因素，给出了上层海洋热含量在加拿大海盆的空间分布。2008年与2003年相比最显著的变化是在加拿大海盆开阔水域的增加，这将导致太阳辐射能进入海洋中的能量增加，同时海冰的大量融化带来了大量淡水，这些变化改变了上层海洋的温盐性质。海冰大量融化主要产生两个效应：一是上层海洋的普遍增暖，二是太平洋入流水体的下移。文中还分析了近年来在加拿大海盆中变化显著的次表层暖水现象，由于次表层暖水蕴含着不小的热含量，其在上层海洋热量平衡中的作用不容忽视。

关键词: 热含量, 淡水含量, 次表层暖水, 加拿大海盆, 海冰消融, 太平洋入流

Abstract:

Conductivity, temperature, and depth (CTD) data collected during summers of 2003 and 2008 were used to study upper-ocean heat content(which refers to the heat content of the top 200 m in this study) of the Canada Basin. The variation of heat content at depth, the heat content differences between these two summers, the main driving factors, and horizontal spatial scale differences were analyzed. The catastrophic reduction of sea ice cover in the Canada Basin was significant when comparing 2003 with 2008, suggesting that more solar radiation was absorbed in the upper ocean during summer of 2008. On the other hand, the reduction of sea ice resulted in more freshwater for the upper ocean. Thus, the properties of sea water were changed. Our study shows that the huge reduction of sea ice would result in two changes: a general increase of the upper-ocean heat content, and an increase of the Pacific inflow water in the Canada Basin. The Near Surface Temperature Maximum (NSTM) water was also analyzed as it is an indicator of the Arctic Ocean warming.

Key words: heat content, freshwater content, NSTM, Canada Basin, melting sea ice, Pacific inflow water