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Characteristics of δ13CDIC in lakes on the Tibetan Plateau and its implications for the carbon cycle

机译：青藏高原湖泊中δ13CDIC的特征及其对碳循环的影响

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Dissolved inorganic carbon isotope (δ13CDIC) is an important tool to reveal the carbon cycle in lake systems. However, there are only few studies focusing on the spatial variation of δ13CDIC of closed lakes. Here we analyze the characteristics of δ13CDIC of 24 sampled lakes (mainly closed lakes) across the Qiangtang Plateau (QTP) and identify the driving factors for its spatial variation. The δ13CDIC value of these observed lakes varies in the range of − 15·0 to 3·2‰, with an average value of − 1·2‰. The δ13CDIC value of closed lakes is close to the atmospheric isotopic equilibrium value, much higher than that in rivers and freshwater lakes reported before. The high δ13CDIC value of closed lakes is mainly attributed to the significant contribution of carbonate weathering in the catchment and the evasion of dissolved CO2 induced by the strong evaporation of lake water. The δ13CDIC value of closed lakes has a logarithmic correlation with water chemistry (TDS, DIC and pCO2), also suggesting that the evapo-concentration of lake water can influence the δ13CDIC value. The δ13CDIC value shows two opposite logarithmic correlations with lake size depending on the δ13CDIC range. This study suggests that the δ13C in carbonates in lacustrine sediments can be taken as an indicator of lake volume variation in closed lakes on QTP. Copyright © 2011 John Wiley & Sons, Ltd.
机译：溶解的无机碳同位素（δ13CDIC）是揭示湖泊系统碳循环的重要工具。但是，很少有研究关注封闭湖泊的δ13CDIC的空间变化。在这里，我们分析了tang塘高原（QTP）上的24个采样湖泊（主要是封闭湖泊）的δ13CDIC特征，并确定了其空间变化的驱动因素。这些观测湖泊的δ13CDIC值在− 15·0至3·2‰的范围内变化，平均值为− 1·2‰。封闭湖泊的δ13CDIC值接近大气同位素平衡值，远高于以前报道的河流和淡水湖泊的δ13CDIC值。封闭湖泊的高δ13CDIC值主要归因于碳酸盐岩风化对流域的显着贡献以及由于湖水强烈蒸发而导致的溶解CO2逃逸。封闭湖泊的δ13CDIC值与水化学（TDS，DIC和pCO2）具有对数相关性，也表明湖泊水的蒸发浓度可以影响δ13CDIC值。 δ13​​CDIC值显示两个相反的对数相关性，其湖泊大小取决于δ13CDIC范围。这项研究表明，湖相沉积物中碳酸盐中的δ13C可以作为QTP封闭湖泊中湖泊体积变化的指标。版权所有©2011 John Wiley＆Sons，Ltd.

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