FN Archimer Export Format
PT J
TI Influence of Ross Sea Bottom Water changes on the warming and freshening of the Antarctic Bottom Water in the Australian-Antarctic Basin
BT 
AF SHIMADA, K.
   AOKI, S.
   OHSHIMA, K. I.
   RINTOUL, S. R.
AS 1:1;2:1;3:1;4:2,3,4,5;
FF 1:;2:;3:;4:;
C1 Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 060, Japan.
   CSIRO Marine & Atmospher Res, Hobart, Tas, Australia.
   Ctr Australian Weather & Climate Res, Hobart, Tas, Australia.
   Univ Tasmania, Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas, Australia.
   CSIRO Wealth Oceans Natl Res Flagship, Hobart, Tas, Australia.
C2 UNIV HOKKAIDO, JAPAN
   CSIRO, AUSTRALIA
   CAWCR, AUSTRALIA
   UNIV TASMANIA, AUSTRALIA
   CSIRO, AUSTRALIA
IN DOAJ
IF 2.16
TC 41
UR https://archimer.ifremer.fr/doc/00140/25131/23241.pdf
LA English
DT Article
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BO L'Astrolabe
AB Changes to the properties of Antarctic Bottom Water in the Australian-Antarctic Basin (AA-AABW) between the 1990s and 2000s are documented using data from the WOCE Hydrographic Program (WHP) and repeated hydrographic surveys. Strong cooling and freshening are observed on isopycnal layers denser than γn = 28.30 kg m−3. Changes in the average salinity and potential temperature below this isopycnal correspond to a basin-wide warming of 1300 ± 200 GW and freshening of 24 ± 3 Gt year−1. Recent changes to dense shelf water in the source regions in the Ross Sea and George V Land can explain the freshening of AA-AABW but not its extensive warming. An alternative mechanism for this warming is a decrease in the supply of AABW from the Ross Sea (RSBW). Hydrographic profiles between the western Ross Sea and George V Land (171–158° E) were analyzed with a simple advective-diffusive model to assess the causes of the observed changes. The model suggests that the warming of RSBW observed between the 1970s and 2000s can be explained by a 21 ± 23% reduction in RSBW transport and the enhancement of the vertical diffusion of heat resulting from a 30 ± 7% weakening of the abyssal stratification. The documented freshening of Ross Sea dense shelf water leads to a reduction in both salinity and density stratification. Therefore the direct freshening of RSBW at its source also produces an indirect warming of the RSBW. A simple box model suggests that the changes in RSBW properties and volume transport (a decrease of 6.7% is assumed between the year 1995 and 2005) can explain 51 ± 6% of the warming and 84 ± 10% of the freshening observed in AA-AABW.
PY 2012
SO Ocean Science
SN 1812-0784
PU Copernicus Gesellschaft Mbh
VL 8
IS 4
UT 000309616400002
BP 419
EP 432
DI 10.5194/os-8-419-2012
ID 25131
ER

EF