Dong Jiang, Shi Xuefa, Gong Xun, Astakhov Anatolii S, Hu Limin, Liu Xiting, Yang Gang, Wang Yixuan, Vasilenko Yuri, Qiao Shuqing, Bosin Alexander, Lohmann Gerrit
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China.
Laboratory for Marine Geology, Pilot Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
Nat Commun. 2022 Sep 13;13(1):5368. doi: 10.1038/s41467-022-33106-1.
Arctic sea ice retreat is linked to extrapolar thermal energy import, while the potential impact of pan-Arctic river heat discharge on sea-ice loss has been unresolved. We reconstructed the Holocene history of Arctic sea ice and Russian pan-Arctic river heat discharge, combining ice-rafted debris records and sedimentation rates from the East Siberian Arctic Shelf with a compilation of published paleoclimate and observational data. In the mid-Holocene, the early summer (June-July) solar insolation was higher than that during the late Holocene, which led to a larger heat discharge of the Russian pan-Arctic rivers and contributed to more Arctic sea ice retreat. This intensified decline of early-summer sea ice accelerated the melting of sea ice throughout the summertime by lowering regional albedos. Our findings highlight the important impact of the larger heat discharge of pan-Arctic rivers, which can reinforce Arctic sea-ice loss in the summer in the context of global warming.
北极海冰的消退与极外热能输入有关，而泛北极河流热排放对海冰损失的潜在影响尚未得到解决。我们结合了东西伯利亚北极大陆架的冰筏碎屑记录和沉积速率，以及已发表的古气候和观测数据，重建了北极海冰和俄罗斯泛北极河流热排放的全新世历史。在全新世中期，初夏（6月至7月）的太阳辐射高于全新世晚期，这导致俄罗斯泛北极河流的热排放增加，并促使更多北极海冰消退。初夏海冰的这种加速消退通过降低区域反照率，加速了整个夏季海冰的融化。我们的研究结果突出了泛北极河流更大热排放的重要影响，这在全球变暖背景下会加剧夏季北极海冰的损失。
