Coupled-isotope characterizes the upwelling of dissolved inorganic carbon from deep water in Kongsfjorden, Svalbard

To investigate the complex carbonate system in Kongsfjorden under climate change, we analyzed carbon isotopes in dissolved inorganic carbon (DIC), as well as previous published carbon isotopes from dissolved organic carbon (DOC), δ18O, and CTD measurements. The absence of a significant difference in average Δ¹⁴C-DIC values between surface waters (+14 ± 3‰) and deep waters (+17 ± 2‰) suggests rapid mixing of water masses. Strong correlations among DIC concentration, Δ¹⁴C-DIC values, and salinity indicate that freshwater dilution and meltwater input introduce aged carbon into the fjord.

为探究气候变化背景下孔斯峡湾（Kongsfjorden）的复杂碳酸盐系统，我们分析了溶解无机碳（dissolved inorganic carbon, DIC）中的碳同位素组成，并整合了已发表的溶解有机碳（dissolved organic carbon, DOC）碳同位素、δ¹⁸O及温盐深（CTD）测量数据。表层海水（+14 ± 3‰）与深层海水（+17 ± 2‰）的平均Δ¹⁴C-DIC值无显著差异，这表明水团存在快速混合过程。溶解无机碳浓度、Δ¹⁴C-DIC值与盐度之间存在强相关性，说明淡水稀释作用与融水输入将老化碳引入了该峡湾。