J. Segschneider et al., Anomalous temperature and salinity variations in the tropical Atlantic: Possible causes and implications for the use of altimeter data, GEOPHYS R L, 27(15), 2000, pp. 2281-2284
Near real time subsurface observations at a PIRATA mooring in the western e
quatorial Atlantic show a temperature and salinity drop in boreal spring 19
99 which is consistent with a 60 m upward shift of the thermocline. At the
same time, sea level observations from TOPEX/Poseidon and ERS-1/2 show anom
alously low values over a large part of the tropical Atlantic north of the
equator. The sea level observations are also used to correct for errors in
upper ocean heat content in a global ocean analysis, which is used to initi
alize seasonal forecasts. It is shown that the ability of altimeter data to
reproduce observed temperature changes is limited in the western equatoria
l Atlantic. This may partly be because large temperature changes occur very
rapidly, but is mainly because strong salinity variations compensate up to
10 cm of the sea level signal from temperature.