Near-Surface Transport Properties and Lagrangian Statistics during Two Contrasting Years in the Adriatic Sea

Type Article
Date 2020-09
Language English
Author(s) Hariri Saeed1, 2
Affiliation(s) 1 : Ifremer, Department of Coastal Environment Dynamics (DYNECO), 29280 Plouzané, France
2 : National Institute of Oceanography and Experimental Geophysics (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico Trieste, Italy
Source Journal Of Marine Science And Engineering (2077-1312) (MDPI AG), 2020-09 , Vol. 8 , N. 9 , P. 681 (20p.)
DOI 10.3390/jmse8090681
Note This article belongs to the Section Physical Oceanography
Keyword(s) Lagrangian statistics, Adriatic OGCM, Bora wind field, residence time, synthetic trajectories, drifter observations
Abstract

This paper describes the near-surface transport properties and Lagrangian statistics in the Adriatic semi-enclosed basin using synthetic drifters. Lagrangian transport models were used to simulate synthetic trajectories from the mean flow fields obtained by the Massachusetts Institute of Technology general circulation model (MITgcm), implemented in the Adriatic from October 2006 until December 2008. In particular, the surface circulation properties in two contrasting years (2007 had a mild winter and cold fall, while 2008 had a normal winter and hot summer) are compared here. In addition, the Lagrangian statistics for the entire Adriatic Basin after removing the Eulerian mean circulation for numerical particles were calculated. The results indicate that the numerical particles were slower in this simulation when compared with the real drifters. This is because of the reduced energetic flow field generated by the MIT general circulation model during the selected years. The numerical results showed that the balanced effects of the wind-driven recirculation in the northernmost area(which would be a sea response to the Bora wind field) and the Po River discharge cause the residence times to be similar during the two selected years (182 and 185 days in 2007 and 2008, respectively). Furthermore, the mean angular momentum, diffusivity, and Lagrangian velocity covariance values are smaller than in the real drifter observations, while the maximum Lagrangian integral time scale is the same

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