加拿大海盆双扩散阶梯结构分布与热通量研究

doi:10.11867/j.issn.1001-8166.2011.02.0193

地球科学进展 ›› 2011, Vol. 26 ›› Issue (2): 193 -201. doi: 10.11867/j.issn.1001-8166.2011.02.0193

赵倩，赵进平

中国海洋大学极地海洋过程与全球海洋变化重点实验室，山东青岛266100

收稿日期:2010-05-10 修回日期:2010-09-17 出版日期:2011-02-10
通讯作者: 赵倩 E-mail:michelle19851221@163.com
基金资助:
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”(编号：40631006)资助

Distribution of Double-diffusive Staircase Structure and Heat Flux in the Canadian Basin

Zhao Qian, Zhao Jinping

Key Laboratory of Polar Oceanography and Global Ocean Change, Ocean University of China, Qingdao266100, China

Received:2010-05-10 Revised:2010-09-17 Online:2011-02-10 Published:2011-02-10

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基于2008年中国第三次北极科学考察的CTD数据，研究了北冰洋加拿大海盆的双扩散现象。双扩散对流导致的阶梯状均匀混合在加拿大海盆广泛存在，在加拿大中央海盆及门捷列夫海脊观测到了明显的双扩散阶梯。阶梯结构在深度分布上有显著的空间差异，在100～500 m深度范围内都可能存在双扩散阶梯，稳定的阶梯结构位于温跃层所在深度，阶梯高度1～5 m,深度较大的阶梯通常是复合阶梯。基于双扩散热通量定律，估计由双扩散引起的向上垂直热通量约为0.05～0.22W/m²，表明大西洋水的热量对加拿大中央海盆上层水的热收支不是重要的。但在楚科奇海台区和加拿大海盆南部海域不存在双扩散阶梯，大西洋水的热量可能对上层海洋结构产生显著影响。

关键词: 加拿大海盆, 双扩散, 阶梯结构, 垂直热通量

Double-diffusive staircase structure is investigated with CTD profile data in the Canadian Basin obtained from the third Chinese Arctic Expedition in summer of 2008.There exist extensive double-diffusive mixed phenomena in the Canadian Basin.Double-diffusive staircase is observed in the central Canada Basin and Mendeleyev Ridge.The distribution of double-diffusive staircase has significant spatial difference.There exists double-diffusive staircase through the depth range of 100~500 m.The 1 m to 5 m high staircase is located in the depth of thermocline.However,the staircase is not of uniform height in the deeper depth,with a wide depth range,which is called composite staircase.On the basis of double-diffusive flux laws, estimated vertical heat fluxes through the staircase are in the range 0.05~0.22 W/m², indicating that the vertical transport of heat from the Atlantic Water in the central basin is unlikely to have a significant impact to the Canadian Basin ocean surface heat budget. However,the south on the Canada Basin and Chukchi Plateau where the well-formed staircase is absent possibly dominate the regionally averaged heat flux.

Key words: Canadian Basin, Double-diffusion, Staircase structure, Vertical heat flux.

中图分类号:

P731.1

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