Accession Number:

ADA582396

Title:

Spring 2009 Water Mass Distribution, Mixing and Transport in the Southern Adriatic after a Low Production of Winter Dense Waters

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Report Date:

2013-05-21

Pagination or Media Count:

19.0

Abstract:

Enhanced mixing of North Adriatic Dense Water NAdDW occurs in a strong frontal region as this cold and fresh intermediate water enters the southern Adriatic basin and meets warm and salty Modified Levantine Intermediate Water MLIW coming from the Ionian Sea. This study examine show NAdDW was mixed and transformed as it traveled southward from the Gargano to the Bari region and investigates the pathway and intrusion patterns of MLIW in late winterspring 2009. Hydrographic data are analyzed to compute source water fractions via a least-squares analysis method and combined with ADCP data to compute source water volume fluxes. Results show that despite an anomalous low year for NAdDW production in the Adriatic, a warmer, fresher and lighter version of traditional lNAdDW i.e.2009 NAdDW endured its journey from Gargano to Bari. In the Gargano region, 2009 NAdDW with fractions up to 80-90 traveled southward in a non-continuous thin, dense vein between 35 m and 100 m isobaths, with diluted cores 50 extending to 140 m depth, and with fluxes of 0.05 Sv, to the southeast, south of Palapellagrasl. Near the sill, 2009 NAdDW was further mixed and diluted with MLIW and surface water. By the time it reached the Bari region, the 2009 NAdDW fraction in the water column was reduced to about 20. MLIW intrusions observed over the Sill and in northern sections of the study area suggest a splitting of MLIW pathways stemming from the main South Adriatic rim pathway towards the central Adriatic. Source water fraction results combined with velocity and seismic oceanography data show that eddies in the study area are one mechanism for the generation of MLIW intrusions towards the northwest.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE