Meridional distribution and seasonal variation of stable oxygen isotope ratio of precipitation in the Southern Ocean

Antarctic Record. 2010;54(2):190-202 DOI 10.15094/00009534


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Journal Title: Antarctic Record

ISSN: 0085-7289 (Print); 2432-079X (Online)

Publisher: National Institute of Polar Research

LCC Subject Category: Geography. Anthropology. Recreation: Geography (General)

Country of publisher: Japan

Language of fulltext: Japanese, English

Full-text formats available: PDF



Kayo Nakamura (Institute of Low Temperature Science, Hokkaido University)
Shigeru Aoki (Institute of Low Temperature Science, Hokkaido University)
Takenobu Toyota (Institute of Low Temperature Science, Hokkaido University)
Yuichi Aoyama (National Institute of Polar Research)


Blind peer review

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Time From Submission to Publication: 12 weeks


Abstract | Full Text

The stable oxygen isotope ratio(δ^<18>O) in precipitation is known to have important meridional and seasonal variations, but there are almost no measurements of δ^<18>O in precipitation over polar oceans. The present research took advantage of 4 opportunities for in situ observations in summer and winter at high latitudes in the Southern Ocean. In addition, we analyzed samples of precipitation at Syowa Station in 2008 to obtain year-round data. Based on these data, we consider the meridional and seasonal variations of δ^<18>O in precipitation over the Southern Ocean. In general, δ^<18>O decreases with increasing latitude, and is lower in winter than in summer. The latitude gradient is stronger in winter. At 60°S, δ^<18>O is -5.4‰ and -11.3‰ in summer and winter, respectively, while the corresponding figures at 66°S are -10.5‰ and -20.8‰. These results will help us understand the mechanisms of the salinity distribution and its variation in the Antarctic Ocean.