Formación de la estructura termohalina del agua en la Bahía de La Paz de verano a otoño

Translated title of the contribution: Formation of the thermohaline structure of water in the Bahía de La Paz from summer to autumn

Felipe Salinas-González, Oleg Zaytsev, Vyacheslav Makarov

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The summer-autumn formation of the thermohaline structure of the coastal deepwater body was studied in Bahía de La Paz, Gulf of California, from measurements the thermohaline variables taken in October 1997, November 1998, August 1999, and in an adjacent area of the Gulf of California in July 1997. In August 1999, intense density stratification was recorded from the surface to 60-m depth, because of a positive daily heat balance and weak vertical mixing. In autumn (Oct. 1997 and Nov. 1998), the upper mixed layer (ML) was 40-50-m thick, and the thermocline had a maximum vertical gradient up to 0.6°C per meter. The three-dimensional distribution of density shows concave isopyenics towards the center of the bay, suggesting the possible existence of anticyclonic vorticity. The non-uniformity of this spatial mass field was formed by local heating and evaporation processes, and by the water exchange with the open ocean through the mouths of the bay. The physical reasons for the variations in the ML are discussed. The deepwater body (>150 m) maintained almost constant thermohaline variables during the study and no noticeable variations were detected in the surface layer. The T-S diagrams were different from those of the Gulf of California water mass and similar to Subtropical Subsurface waters ones (less saline). In October 1997, a 2.5°C increase in temperature was measured at the surface layer which considered related to the peak of the 1997 El Nino.

Translated title of the contributionFormation of the thermohaline structure of water in the Bahía de La Paz from summer to autumn
Original languageSpanish
Pages (from-to)51-65
Number of pages15
JournalCiencias Marinas
Volume29
Issue number1
DOIs
StatePublished - 1 Mar 2003
Externally publishedYes

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