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A corollary to the silicic acid leakage hypothesis

机译:硅酸泄漏假说的推论

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The silicic acid leakage hypothesis (SALH) attempts to explain part of the large and regular atmospheric CO2 changes over the last glacial-interglacial cycles. It calls for a reduction in the carbonate pump through a growth in diatoms at the expense of coccolithophorids in low-latitude surface waters, driven by a "leakage'' of high-Si:N waters from the Southern Ocean. Recent studies that present low opal accumulation rates from the glacial eastern equatorial Pacific have challenged SALH. In a corollary to SALH, we argue that the key to SALH is the dominance of diatoms over coccolithophorids, and this does not depend on the magnitude of diatom production per se. In support of our claim, we show in a numerical model that atmospheric CO2 can be lowered with even a reduced absolute flux of silicic acid leakage, provided that Si: N in the leakage is elevated and that the excess Si can be used by diatoms to shift the floral composition in their favor.
机译:硅酸泄漏假说(SALH)试图解释在过去的冰冰间期循环中大气CO2的大量且规则的变化。它要求在低纬度地表水中以硅藻长寿菌为代价,通过硅藻的生长来减少碳酸盐泵,这是由于南大洋的高Si:N水“泄漏”造成的。来自冰川赤道东太平洋的蛋白石积累速率已经对SALH提出了挑战,在SALH的推论中,我们认为SALH的关键在于硅藻对球墨镜藻体的优势,而这并不取决于硅藻本身的产量。根据我们的主张,我们在一个数值模型中表明,即使硅酸泄漏的绝对通量减少,也可以降低大气中的二氧化碳,只要泄漏中的Si:N升高并且硅藻可以利用过量的Si来转移硅。花卉组成对他们有利。

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