Hypersensitivity of Southern Ocean air-sea carbon fluxes to turbulent diapycnal mixing
Hypersensitivity of Southern Ocean air-sea carbon fluxes to turbulent diapycnal mixing
复制标题
南大洋海气碳通量对湍流二密混合的超敏感性
DOI：
10.1002/essoar.10508126.1
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ellison E
中科院分区：
文献类型：
--
作者：
Ellison E
南大洋(SO)连接了主要的海洋盆地，并拥有大量的海-气碳通量，这是由于在强大的地面风的推动下，营养丰富和富碳的深层水域重新浮出水面。由强地面风激发的破碎波以及潮汐、急流和涡旋与粗糙地形的相互作用引起的SO中的垂直混合，被认为是全球经向翻转环流的次要因素。它对生物周期的重要性在很大程度上被认为是由于混合在改变百年时间尺度上的潜在动态方面所起的作用。利用一个同化了大量观测的涡旋分辨海洋模式，我们发现，混合的改变可以通过改变溶解的无机碳、碱度、温度和盐度的分布，在短短几年内引起海气通量高达40%的变化。这种增强的混合可能是由潮汐波从地球各地传播到SO以及从SO深到浅的波能通量引起的。这样的过程在气候模型中尚未解决，但却是必不可少的。
The Southern Ocean (SO) connects major ocean basins and hosts large air-sea carbon fluxes due to the resurfacing of deep nutrient and carbon rich waters, driven by strong surface winds. Vertical mixing in the SO, induced by breaking waves excited by strong surface winds and interaction of tides, jets and eddies with rough topography, has been considered of secondary importance for the global meridional overturning circulation. Its importance for biological cycles has largely been assumed to be due to the role of mixing in changing the underlying dynamics on a centennial timescale. Using an eddy-resolving ocean model that assimilates an extensive array of observations, we show that altered mixing can cause up to a 40\% change in SO air-sea fluxes in only a few years through altering the distribution of dissolved inorganic carbon, alkalinity, temperature and salinity. Such enhanced mixing may be induced by the propagation of tidal waves from around the globe to the SO as well as the flux of wave energy from the deep SO to shallow depths. Such processes are unresolved in climate models, yet essential.