Variations of the tropical Atlantic and Pacific SSS minimum zones and their relations to the ITCZ and SPCZ rain bands (1979–2009)
2015
This study focuses on the time-space variability of the low Sea Surface Salinity (
SSS) waters extending zonally within 2°N–12°N in the Atlantic and Pacific and within 6°S–16°S in the western third of the Pacific. The analysis is based on a combination of in situ
SSSobservations collected in the last three decades from voluntary observing ships, TAO/TRITON and PIRATA moorings,
Argofloats, and (few)
CTDprofiles. The mean latitudes of the Atlantic and Pacific low
SSSwaters appear 1°–3° further poleward than the Evaporation minus Precipitation (E-P) minima linked to the Inter Tropical
Convergence Zones(ITCZ) and
South Pacific Convergence Zone(SPCZ). At the seasonal time scale, the E-P minima migrate poleward in summer hemispheres, leading the migration of the
SSSminima by 2–3 months in the Atlantic ITCZ, Pacific SPCZ, and in the eastern part of the Pacific ITCZ. On the other hand, the seasonal displacements of E-P and
SSSminima are in antiphase in the central and western parts of the Pacific ITCZ. At the interannual time scale, the E-P and
SSSminima migrate poleward during
La Ninaevents in the Pacific and during the positive phase of the Atlantic Meridional Dipole (AMD) in the Atlantic (and vice versa during El Nino and the negative phase of the AMD). We further document long-term (1979–2009) meridional migrations of the E-P and
SSSminima, especially in the SPCZ region, and discuss whether or not they are consistent with documented SST and
wind stresstrends.
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