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Summer and winter surveys of the Subtropical Front of the southeastern Indian Ocean 1997-1998 James, C.; Tomczak, M.; Helmond, I.; Pender, L. (2002). Summer and winter surveys of the Subtropical Front of the southeastern Indian Ocean 1997-1998. J. Mar. Syst. 37(1-2): 129-149. http://dx.doi.org/10.1016/s0924-7963(02)00199-9 In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 59013 [ download pdf ]

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Trefwoorden

Environmental effects > Salinity effects Environmental effects > Temperature effects Fronts > Oceanic fronts Gradients > Density gradients ISW, South Indian Ocean Layers > Water column > Mixed layer Seasons > Summer Seasons > Winter Surveys Temporal variations > Periodic variations > Seasonal variations Indian Ocean [Marine Regions] Marien/Kust

Author keywords

Subtropical Front; summer; winter; density compensation; SeaSoar;Australia; 119-147 degrees E; 36-45 degrees S

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Auteurs		Top
James, C. Tomczak, M. Helmond, I. Pender, L.

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Abstract

The Subtropical Front (STF) in the region south of Australia was surveyed to determine its location, character, and seasonal variation. The survey consisted of two cruises, during summer and winter of 1998, and used a towed CTD system (SeaSoar). Based on observations, the STF does not appear to be continuous between the Indian and Pacific Oceans in the region south of Tasmania during winter; instead, it appears to end at the continental shelf of western Bass Strait near 40°S. During both seasons, the STF is characterized by moderate to strong density compensation with the horizontal density ratio (Rro=alphaDeltaT/bètaDeltaS) close to 1 both in and below the mixed layer. This contrasts with observations in other regions where Rro tends towards 2 below the mixed layer. We observed a high degree of interleaving, submerged eddies and small scale temperature and salinity variability. This is attributed to the interaction of a front that is density compensated with a local wind field that periodically reverses direction.

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