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

• Main Authors: Rice, Ana E, Book, Jeffrey W, Carniel, Sandro, Russo, Aniello, Schroeder, Katrin, Wood, Warren T
• Other Authors: NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
• Format: Text
• Language: English
• Published: 2013
• Subjects: Physical and Dynamic Oceanography; Seismology; *ADRIATIC SEA; CONTINENTAL SHELVES; DENSITY; FLUX(RATE); MIXING; SHALLOW DEPTH; WATER MASSES; WINTER; FRONTAL REGION; INTRUSIONS; *SEISMIC OCEANOGRAPHY; SOUTHERN ADRIATIC SEA; NADW(NORTH ADRIATIC DENSE WATER); MLIW(MODIFIED LEVANTINE INTERMEDIATE WATER); WATER FLUX; PE0601153N; 73-9858-A2-5; NADW
• Online Access: http://www.dtic.mil/docs/citations/ADA582396; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA582396

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 winter/spring 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. Published in Continental Shelf Research, v64 p33-50, 21 May 2013. Prepared in cooperation with CNR -National Research Council of Italy, ISMAR- Marine Sciences Institute in Venezia, Venice, Italy, DISVA,Universit Politecnica delle Marche, Ancona, Italy, CNR -National Research Council of Italy, ISMAR- Marine Sciences Institute in Bologna, Bologna, Italy, and CNR -National Research Council of Italy, ISMAR- Marine Sciences Institute in La Spezia, Pozzuolo di Lerici, Italy.