Comment on: "Technical note: Consistent calculation of aquatic gross production from oxygen triple isotope measurements" by Kaiser (2011)
Comment on: "Technical note: Consistent calculation of aquatic gross production from oxygen triple isotope measurements" by Kaiser (2011)
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评论：“技术说明：根据氧三重同位素测量对水生总产量进行一致计算”，Kaiser (2011)
DOI：
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
D. Nicholson
中科院分区：
文献类型：
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作者：
D. Nicholson
抽象的。Kaiser(2011)介绍了一种改进的方法，用于根据水生系统中溶解氧的三重同位素组成计算总生产力。他的方程避免了以前方法的近似，还考虑了额外的物理过程，如入侵期间的动力学分馏和海-气界面的逃逸。然而，当将他的新方法与以前的方法进行比较时，Kaiser对生物终端成员的定义并不一致，结果是高估了以前研究的各种方法的分歧程度。特别是，在他的基本情况下，Kaiser将17O过量分配给光合作用的产物(17δP)太低，导致他的结果与以前的公式相比高出约30%。当这一点被修正后，我发现对于代谢平衡(F)和总生产率(G)的实际条件，Kaiser方程与所有以前的研究方法在±20%范围内是一致的。±20%的方法偏差与目前海-气输送速度k随风速变化的不确定程度类似，后者也直接影响计算的总生产率。虽然以前的结果可以而且应该用提出的改进方程重新审视和修正，但这种修正的幅度可能比Kaiser所暗示的要小得多。
Abstract. Kaiser (2011) has introduced an improved method for calculating gross productivity from the triple isotopic composition of dissolved oxygen in aquatic systems. His equation avoids approximations of previous methodologies, and also accounts for additional physical processes such as kinetic fractionation during invasion and evasion at the air-sea interface. However, when comparing his new approach to previous methods, Kaiser inconsistently defines the biological end-member with the result of overestimating the degree to which the various approaches of previous studies diverge. In particular, for his base case, Kaiser assigns a 17O excess to the product of photosynthesis (17δP) that is too low, resulting in his result being ~30 % too high when compared to previous equations. When this is corrected, I find that Kaiser's equations are consistent with all previous study methodologies within about ±20 % for realistic conditions of metabolic balance (f) and gross productivity (g). A methodological bias of ±20 % is of similar magnitude to current uncertainty in the wind-speed dependence of the air-sea gas transfer velocity, k, which directly impacts calculated gross productivity rates as well. While previous results could and should be revisited and corrected using the proposed improved equations, the magnitude of such corrections may be much less than implied by Kaiser.
技术说明：根据氧三重同位素测量对水产总产量进行一致计算
影响因子：
4.9
作者：
Kaiser J
通讯作者：
Kaiser J