Ras Al Hadd eddy tracking in the Arabian Sea

Date 2000
Temporal extent 2000-01-01 -2015-12-31
Author(s) Ayouche AdamORCID1, Carton XavierORCID1, de Marez CharlyORCID1, Morvan MathieuORCID1, L'Hégaret PierreORCID1, Stegner AlexandreORCID2, Le Vu Briac2
Affiliation(s) 1 : Laboratoire d’Océanographie Physique et Spatiale, Institut Universitaire Européen de la Mer, Universite de Bretagne Occidentale, 29200 Brest
2 : Le Laboratoire de météorologie dynamique (LMD), Ecole Polytechnique, 91120 Palaiseau, France
DOI 10.17882/79370
Publisher SEANOE
Keyword(s) Arabian Sea, AVISO, ARGO, AMEDA, Ras Al Hadd dipole, Eddy Tracking

The Ras al Hadd oceanic dipole is a recurrent association of a cyclone (to the northeast) and of an anticyclone (to the southwest), which forms in summer and breaks up at the end of autumn. It lies near the Ras al Hadd cape, southeast of the Arabian peninsula. Its size is on the order of 100 km. Along the axis of this dipole flows an intense jet, the Ras al Had jet. Using altimetric data and an eddy detection and tracking algorithm (AMEDA: Angular Momentum Eddy Detection and tracking Algorithm), we describe the life cycle of this oceanic dipole over a year (2014–2015). We also use the results of a numerical model (HYCOM, the HYbrid Coordinate Ocean Model) simulation, and hydrological data from ARGO profilers, to characterize the vertical structure of the two eddies composing the dipole, and their variability over a 15 year period. We show that (1) before the dipole is formed, the two eddies that will compose it, come from different locations to join near Ras al Hadd, (2) the dipole remains near Ras al Hadd during summer and fall while the wind stress (due to the summer monsoon wind) intensifies the cyclone, (3) both the anticyclone and the cyclone reach the depth of the Persian Gulf Water outflow, and (4) their horizontal radial velocity profile is often close to Gaussian but it can vary as the dipole interacts with neighboring eddies. As a conclusion, further work with a process model is recommended to quantify the interaction of this dipole with surrounding eddies and with the atmosphere.

Licence CC-BY
File Size Format Processing Access
Eddy Track and Argo colocalization (AMEDA outputs) for the Ras Al Hadd dipole 12 MB NC, NetCDF Processed data Open access
AVISO SATELLITE DATA (DYNED ATLAS) - ARABIAN SEA (2014/2015) 444 MB NC, NetCDF Processed data Open access
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How to cite 

Ayouche Adam, Carton Xavier, de Marez Charly, Morvan Mathieu, L'Hégaret Pierre, Stegner Alexandre, Le Vu Briac (2000). Ras Al Hadd eddy tracking in the Arabian Sea. SEANOE. https://doi.org/10.17882/79370

In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :

Ayouche Adam, de Marez Charly, Morvan Mathieu, L'Hegaret Pierre, Carton Xavier, Le Vu Briac, Stegner Alexandre (2021). Structure and Dynamics of the Ras al Hadd Oceanic Dipole in the Arabian Sea. Oceans, 2(1), 105-125. Publisher's official version : https://doi.org/10.3390/oceans2010007 , Open Access version : https://archimer.ifremer.fr/doc/00679/79107/