Freshening of the Adelie Land Bottom Water near 140 E

Repeat summer hydrographic observations along 140E are used to document significant changes in the properties of the Adlie Land Bottom Water (ALBW) between the mid-1990s and 20022003. Water on the 28.35 kgm−3 neutral density surface cooled by 0.2C and freshened by 0.03 psu between 1994 and 2002. By...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Aoki, S, Rintoul, SR, Ushio, S, Watanabe, S, Bindoff, NL
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2005
Subjects:
Earth Sciences
Oceanography
Physical Oceanography
Antarctic
Australian Antarctic Basin
Australian-Antarctic Basin
Adelie Land
Antarc*
Online Access:https://doi.org/10.1029/2005GL024246
http://ecite.utas.edu.au/43490
Description
Summary:Repeat summer hydrographic observations along 140E are used to document significant changes in the properties of the Adlie Land Bottom Water (ALBW) between the mid-1990s and 20022003. Water on the 28.35 kgm−3 neutral density surface cooled by 0.2C and freshened by 0.03 psu between 1994 and 2002. By re-occupying the same stations in the same season, the effects of seasonal variability and spatial variability were minimised allowing the signal of water mass changes to be clearly identified. Comparison of the recent data to high quality historical observations shows that the ALBW also freshened between the late 1960s and the mid-1990s. Although there is insufficient data to construct a continuous time series, the simplest explanation of the observed changes is that there has been a long-term (>30 year) and continuing freshening of the source waters supplying bottom water to the Australian-Antarctic basin.

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