Distribution of Double-diffusive Staircase Structure and Heat Flux in the Canadian Basin
Received date: 2010-05-10
Revised date: 2010-09-17
Online published: 2011-02-10
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.
Zhao Qian, Zhao Jinping . Distribution of Double-diffusive Staircase Structure and Heat Flux in the Canadian Basin[J]. Advances in Earth Science, 2011 , 26(2) : 193 -201 . DOI: 10.11867/j.issn.1001-8166.2011.02.0193
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