Sea surface temperature anomalies on the western south atlantic from 1982 to 1994

C. A D Lentini, Guillermo P Podesta, E. J D Campos, Donald Olson

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Thirteen years of weekly sea surface temperature (SST) fields derived from satellite data (January 1982-December 1994) are used to investigate spatial and temporal variabilities of SSt in the western region of the South Atlantic Ocean. The analysis is focused on the large-scale variations over the continental shelf and slope region with depths less than 1000 m, between 42 and 22°s. Within the 13-year span, a total of 13 cold and seven warm SST anomalies are observed during and right after ENSO onset. Northward-propagating cold and warm anomalies have average speeds of the order of 18 and 14 cm/s, respectively. Southward-advected cold and warm anomalies, on the other hand, have slower speeds. From a principal component analysis, the first two modes for the inner along-shelf transect, which account for more than 65% of the total non-seasonal variance, suggest a tendency for cold SST anomalies (SSTAs) to be related to ENSO events. Possible connections between SSTAs and the Southern Oscillation Index are also explored. Consideration of the SSTA analyses seem to confirm the hypothesis that the anomalous cold (warm) water extensions to the north on the shelf occur generally in every warm (cold) ENSO + 1 year in the present climatology.

Original languageEnglish (US)
Pages (from-to)89-112
Number of pages24
JournalContinental Shelf Research
Volume21
Issue number1
DOIs
StatePublished - 2001

Fingerprint

temperature anomaly
surface temperature
sea surface temperature
El Nino-Southern Oscillation
anomaly
Southern Oscillation
warm water
continental slope
cold water
climatology
satellite data
continental shelf
principal component analysis
Atlantic Ocean
transect
remote sensing
cold
oscillation
water
speed

Keywords

  • AVHRR
  • ENSO
  • South Alantics
  • SST
  • Teleconnections

ASJC Scopus subject areas

  • Aquatic Science
  • Geology
  • Oceanography

Cite this

Sea surface temperature anomalies on the western south atlantic from 1982 to 1994. / Lentini, C. A D; Podesta, Guillermo P; Campos, E. J D; Olson, Donald.

In: Continental Shelf Research, Vol. 21, No. 1, 2001, p. 89-112.

Research output: Contribution to journalArticle

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