CIMA, IPMA and CCMAR are pulling resources together for the long-term monitoring of water circulation along the southern coast of the Algarve, Portugal.

Coastal Circulation

Figure 1. Localisation of the deployment stations (Alv: Alvor; Qua: Quarteira; Arm: Armona; Tav: Tavira; Cac: Cacela).

Current and temperature data had been collected since 2008 using Acoustic Doppler Current Profilers (ADCPs), bottom-mounted for ~3 months periods at various locations in 20 m water depth along the coast (Figure 1).

Monitoring is prioritarly conducted at Armona Station which is the site with the largest deployments. Deployments at the other stations are more sporadic, dependent of technical constraints and instrument availabilities. Time-series coverage at each station is indicated in Figure 2.

Coastal Circulation 1

Figure 2. Recorded time-series at each station.

One of the main objectives is to study the alternation of eastward and westward currents that characterise the water circulation along the coast. Of particular interest is the identification of the mechanisms that drive westward currents known for warming up episodically the coastal water in summer (Figure 3).

Coastal Circulation 2

Figure 3. Example of alongshore current (upper) and temperature (lower) time-series collected at Armona (red) and Tavira (blue) stations in April-July 2014. The periods of westward currents (grey boxes) are associated with strong increase in water temperature.

Coordinators:

Prof. Paulo Relvas (CCMAR), Dr. Erwan Garel (CIMA) and Dr. Teresa Drago (IPMA)

For data access or more information please contact Dr. Erwan Garel (This email address is being protected from spambots. You need JavaScript enabled to view it.).

Acknowledgments

The support of Tunipex has been essential for the maintenance of the time-series at Armona Station and is gratefully acknowledged. Thanks are extended to Capitania de Portimão, U-Diving and L. Juniór for their assistance during deployment and recovery operations.

Related publications:

  • Garel, E., Laiz, I., Drago, T., & Relvas, P. (2016). Characterisation of coastal counter-currents on the inner shelf of the Gulf of Cadiz. Journal of Marine Systems, 155, 19–34. https://doi.org/10.1016/j.jmarsys.2015.11.001

  • de Oliveira Júnior, L., Garel, E., Drago, T., Relvas, P. (2017), Coastal counter-currents setup patterns in the Gulf of Cadiz: an indication of their forcing factors. Presented in 2017 AGU Fall Meeting, New Orleans, LA, 13 December.