Earth Sciences

Arctic deep-water anoxia and its potential role for ocean carbon sink during glacial periods

K. Jang, K. S. Woo, et al.

Explore groundbreaking findings by Kwangchul Jang, Kyung Sik Woo, Jin-Kyoung Kim, and Seung-Il Nam that reveal how deep-water freshening beneath pan-Arctic ice shelves during glacial periods may have turned the western Arctic Ocean into a hidden carbon reservoir. This research sheds light on the influences of paleo-ice sheets on Polar Deep Water conditions over the last 76,000 years.

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Abstract

Recent research suggests deep-water freshening beneath pan-Arctic ice shelves during glacial periods due to the absence of excess thorium in glacial Arctic sediments. This study presents structural and geochemical analyses of authigenic carbonates from Mendeleev Ridge sediments (western Arctic Ocean) over the last 76 kyr. Results indicate brackish and anoxic Polar Deep Water (PDW) during stadial periods, likely caused by sediment-laden meltwater discharge from paleo-ice sheets. This suggests the western Arctic Ocean may have acted as an additional carbon reservoir during glacial-interglacial cycles.

Publisher

Communications Earth & Environment

Published On

Feb 21, 2023

Authors

Kwangchul Jang, Kyung Sik Woo, Jin-Kyoung Kim, Seung-Il Nam

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