FN Archimer Export Format
PT J
TI Salinity adjustments in the presence of temperature data assimilation
BT 
AF TROCCOLI, Alberto
   BALMASEDA, Magdalena A.
   SEGSCHNEIDER, Joachim
   VIALARD, Jerome
   ANDERSON, David L. T.
   HAINES, Keith
   STOCKDALE, Tim
   VITART, Frédéric
   FOX, Alan D.
AS 1:1;2:1;3:1;4:1;5:1;6:2;7:1;8:1;9:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England.
   Univ Edinburgh, Dept Meteorol, Edinburgh, Midlothian, Scotland.
C2 ECMWF, UK
   UNIV EDINBURGH, UK
IF 1.886
TC 58
UR https://archimer.ifremer.fr/doc/00251/36272/34839.pdf
LA English
DT Article
CR PIRATA-FR1
   PIRATA-FR1BIS
   PIRATA-FR2
BO Antea
AB This paper is an evaluation of the role of salinity in the framework of temperature data assimilation in a global ocean model that is used to initialize seasonal climate forecasts. It is shown that the univariate assimilation of temperature profiles, without attempting to correct salinity, can induce first-order errors in the subsurface temperature and salinity fields. A recently developed scheme by A. Troccoli and K. Haines is used to improve the salinity field. In this scheme, salinity increments are derived from the observed temperature, by using the model temperature and salinity profiles, assuming that the temperature-salinity relationship in the model profiles is preserved. In addition, the temperature and salinity fields are matched below the observed temperature profile by vertically displacing the original model profiles. Two data assimilation experiments were performed for the 6-yr period 1993-98. These show that the salinity scheme is effective at maintaining the haline and thermal structures at and below thermocline level, especially in tropical regions, by avoiding spurious convection. In addition to improvements in the mean state, the scheme allows more temporal variability than simply controlling the salinity field by relaxation to climatological data. Some comparisons with sparse salinity observations are also made, which suggest that the subsurface salinity variability in the western Pacific is better reproduced in the experiment in which the salinity scheme is used. The salinity analyses might be improved further by use of altimeter sea level or sea surface salinity observations from satellite.
PY 2002
SO Monthly Weather Review
SN 0027-0644
PU Amer Meteorological Soc
VL 130
IS 1
UT 000172721600006
BP 89
EP 102
DI 10.1175/1520-0493(2002)130<0089:SAITPO>2.0.CO;2
ID 36272
ER

EF