FN Archimer Export Format
PT J
TI Deep temperature variability in Drake Passage
BT 
AF FIRING, Yvonne L.
   MCDONAGH, Elaine L.
   KING, Brian A.
   DESBRUYERES, Damien
AS 1:1;2:1;3:1;4:1;
FF 1:;2:;3:;4:;
C1 Natl Oceanog Ctr, European Way, Southampton SO14 3ZH, Hants, England.
C2 NOC, UK
IF 2.711
TC 8
UR https://archimer.ifremer.fr/doc/00387/49812/50390.pdf
LA English
DT Article
DE ;temperature;trends;Southern Ocean
AB Observations made on 21 occupations between 1993 and 2016 of GO-SHIP line SR1b in eastern Drake Passage show an average temperature of 0.53 degrees C deeper than 2000 dbar, with no significant trend, but substantial year-to-year variability (standard deviation 0.08 degrees C). Using a neutral density framework to decompose the temperature variability into isopycnal displacement (heave) and isopycnal property change components shows that approximately 95% of the year-to-year variance in deep temperature is due to heave. Changes on isopycnals make a small contribution to year-to-year variability but contribute a significant trend of -1.40.6 m degrees C per year, largest for density ((n))>28.1, south of the Polar Front (PF). The heave component is depth-coherent and results from either vertical or horizontal motions of neutral density surfaces, which trend upward and northward around the PF, downward for the densest levels in the southern section, and downward and southward in the Subantarctic Front and Southern Antarctic Circumpolar Current Front (SACCF). A proxy for the locations of the Antarctic Circumpolar Current (ACC) fronts is constructed from the repeat hydrographic data and has a strong relationship with deep ocean heat content, explaining 76% of deep temperature variance. The same frontal position proxy based on satellite altimeter-derived surface velocities explains 73% of deep temperature variance. The position of the PF plays the strongest role in this relationship between ACC fronts and deep temperature variability in Drake Passage, although much of the temperature variability in the southern half of the section can be explained by the position of the SACCF. 
PY 2017
PD JAN
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 122
IS 1
UT 000394996400042
BP 713
EP 725
DI 10.1002/2016JC012452
ID 49812
ER

EF