The dissolved organic carbon (DOC) of Svalbard’s glacier meltwater has received limited attention. Due to the northward ocean current, terrestrial DOC output from Svalbard eventually enters the Arctic Ocean, rather than travelling southward into the Atlantic. This makes the role of Svalbard glaciers in the Arctic marine carbon budget significantly different from that of Greenland glaciers. Field work was conducted in Ny-Ålesund, Svalbard in late summer, 2017 to reveal the fate of DOC in turbid glacier meltwaters in Svalbard. Based on mixing incubation over 25 h, bio- and photo-degradation over 10 days, and long-term biodegradation over 13 months, it is believed that glacier meltwater DOC fraction is linearly mixed and diluted with seawater in the turbid plume area due to light limitation. When the light limitation is removed (e.g., in the clear offshore waters), 78% of the DOC undergoes photo-degradation or photo-triggered synergistic degradation within 10 days, rather than solely microbial degradation. Over the long-term, 73% of initial DOC was lost after being kept in the dark for 13 months. This work underlines that 4/5 of the Svalbard glaciers DOC would be degraded in Arctic coast within 10 days after entering the sea, generating a positive feedback to global warming. Photo-degradation, and/or photo-triggered synergistic degradation, is the key mechanism. Approximately one-fifth of the original concentration exhibited resistance and this fraction of DOC would be transported out of the fjord and likely into the Arctic Ocean.

斯瓦尔巴冰川融水的溶解有机碳 (DOC) 受到的关注有限。由于洋流向北，斯瓦尔巴群岛的陆地 DOC 输出最终进入北冰洋，而不是向南进入大西洋。这使得斯瓦尔巴冰川在北极海洋碳收支中的作用与格陵兰冰川显着不同。2017 年夏末在斯瓦尔巴群岛的新奥勒松进行了实地工作，以揭示 DOC 在斯瓦尔巴群岛浑浊的冰川融水中的命运。基于 25 小时的混合孵育、10 天的生物降解和光降解以及 13 个月的长期生物降解，认为冰川融水 DOC 组分在混浊羽流区域与海水线性混合和稀释。局限性。当光线限制被移除时（例如，在清澈的近海水域），78% 的 DOC 在 10 天内发生光降解或光触发协同降解，而不仅仅是微生物降解。从长期来看，在黑暗中保存 13 个月后，73% 的初始 DOC 丢失了。这项工作强调了 4/5 的斯瓦尔巴冰川 DOC 将在入海后 10 天内在北极海岸退化，从而对全球变暖产生积极的反馈。光降解和/或光触发协同降解是关键机制。大约五分之一的原始浓度表现出阻力，这部分 DOC 将被运出峡湾并可能进入北冰洋。而不仅仅是微生物降解。从长期来看，在黑暗中保存 13 个月后，73% 的初始 DOC 丢失了。这项工作强调了 4/5 的斯瓦尔巴冰川 DOC 将在入海后 10 天内在北极海岸退化，从而对全球变暖产生积极的反馈。光降解和/或光触发协同降解是关键机制。大约五分之一的原始浓度表现出阻力，这部分 DOC 将被运出峡湾并可能进入北冰洋。而不仅仅是微生物降解。从长期来看，在黑暗中保存 13 个月后，73% 的初始 DOC 丢失了。这项工作强调了 4/5 的斯瓦尔巴冰川 DOC 将在入海后 10 天内在北极海岸退化，从而对全球变暖产生积极的反馈。光降解和/或光触发协同降解是关键机制。大约五分之一的原始浓度表现出阻力，这部分 DOC 将被运出峡湾并可能进入北冰洋。光降解和/或光触发协同降解是关键机制。大约五分之一的原始浓度表现出阻力，这部分 DOC 将被运出峡湾并可能进入北冰洋。光降解和/或光触发协同降解是关键机制。大约五分之一的原始浓度表现出阻力，这部分 DOC 将被运出峡湾并可能进入北冰洋。