Upper ocean observations in eastern Caribbean Sea reveal barrier layer within a warm core eddy

J. E. Rudzin, Lynn K Shay, B. Jaimes, J. K. Brewster

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Three-dimensional measurements of a large warm core eddy (WCE) and the Caribbean Current are acquired using oceanic profilers deployed during a NOAA research aircraft study in September 2014 in the eastern Caribbean Sea. Measurements of the near-surface atmosphere are also collected to examine air-sea processes over the eddy. These novel measurements showcase temperature and salinity for the eddy and background flow, upper ocean stratification, a residing barrier layer (BL), velocity structure, and water mass characteristics. The eddy's thermal structure is alike that of WCEs in the Gulf of Mexico (GoM) whereas surrounding waters have relatively deeper isotherms compared to its GoM counterparts. Analyses suggest that upper ocean stratification within the study region is due to a BL. These are the first observations of a BL inside a WCE to the best of our knowledge. Reduced shear comparisons suggest that the upper ocean, especially within the WCE, would be more resistant to tropical cyclone (TC) induced mixing than the GoM because of the BL. The eddy is suspected to originate from North Brazil Current rings, given its fresh anomalies relative to climatology and surrounding waters and its trajectory prior to sampling. Atmospheric measurements suggest the WCE is influencing the lower atmosphere along its boundaries. These observations signify that not only does this WCE have deep thermal structure and modulate the near-surface atmosphere but it is unique because it has a BL. The findings and analyses suggest that a similar eddy could potentially influence air-sea processes, such as those during TC passage.

Original languageEnglish (US)
Pages (from-to)1057-1071
Number of pages15
JournalJournal of Geophysical Research: Oceans
Volume122
Issue number2
DOIs
StatePublished - Feb 1 2017

Fingerprint

Caribbean Sea
upper ocean
barrier layers
eddy
oceans
Gulf of Mexico
vortices
Water
hurricanes
Salinity measurement
Research aircraft
Climatology
Air
heat
Temperature measurement
air
Isotherms
aircraft
Trajectories
cyclones

Keywords

  • air-sea interaction
  • barrier layer
  • Caribbean Sea
  • in situ observations
  • upper ocean
  • warm-core eddy

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Upper ocean observations in eastern Caribbean Sea reveal barrier layer within a warm core eddy. / Rudzin, J. E.; Shay, Lynn K; Jaimes, B.; Brewster, J. K.

In: Journal of Geophysical Research: Oceans, Vol. 122, No. 2, 01.02.2017, p. 1057-1071.

Research output: Contribution to journalArticle

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