Distribution of Oxygen Isotope Ratio of Precipitation in the Atlantic-Indian Sectors of the Southern Ocean

Herein, the spatial distribution of stable oxygen isotope ratios (delta O-18) of precipitation in the Atlantic to Indian sectors of the Southern Ocean is examined using the results of in situ observations and numerical modeling. In situ observations of 59 precipitation events reveal poleward decreas...

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Bibliographic Details
Published in:SOLA
Main Authors: Nakamura, Kayo, Aoki, Shigeru, Yoshimura, Kei, Kurita, Naoyuki
Format: Article in Journal/Newspaper
Language:English
Published: Meteorological Society of Japan
Subjects:
452
Southern Ocean
Indian
Online Access:http://hdl.handle.net/2115/57809
https://doi.org/10.2151/sola.2014-032
Description
Summary:Herein, the spatial distribution of stable oxygen isotope ratios (delta O-18) of precipitation in the Atlantic to Indian sectors of the Southern Ocean is examined using the results of in situ observations and numerical modeling. In situ observations of 59 precipitation events reveal poleward decrease of delta O-18, with a larger meridional gradient south of 60 degrees S. Moreover, the estimates from the observations and model (IsoGSM) agree reasonably well, with a mean absolute difference of 4.3 parts per thousand. Thus, the IsoGSM results generally support the observed poleward increase in the meridional gradient. These results will prove valuable in investigating the atmospheric water cycle and in studying oceanic processes of water mass formation and transport.

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