A. Pietri

• PhD
• Research faculty at University of Massachusetts Dartmouth

During the last 4 decades punctual occurrences of extreme ocean temperatures, known as marine heatwaves (MHWs), have been regularly disrupting the coastal ecosystem of the Peru-Chile eastern boundary upwelling system. In fact, this coastal system and biodiversity hot-spot is regularly impacted by El Niño events, whose variability has been related t...

The observation station “Melax” was deployed in 2015 on the wide and shallow south Senegalese shelf to study the ocean dynamics, air‐sea interactions, and dissolved oxygen (DO) cycle. Data from February 2015 to August 2016 were used to study the main physical processes affecting the variability of DO in the bottom layer (∼30 m depth) on time scales...

The quasi-geostrophic and the generalized omega equations are the most widely used methods to reconstruct vertical velocity ( w ) from in-situ data. As observational networks with much higher spatial and temporal resolutions are being designed, the question rises of identifying the approximations and scales at which an accurate estimation of w thro...

Vertical velocities can be estimated indirectly from in situ observations by theoretical frameworks like the ω‐equation. Direct measures of vertical exchanges are challenging due to their typically ephemeral spatiotemporal scales. In this study we address this problem with an adaptive sampling strategy coupling various biophysical instruments. We a...

A submesocale coherent vortex (SCV) with a low oxygen core is characterized from underwater glider and mooring observations from the eastern tropical North Atlantic, north of the Cape Verde Islands. The eddy crossed the mooring with its center and a one-month time series of the SCV's hydrographic and upper 100 m currents structure was obtained. Abo...

The temporal evolution of the physical and biogeochemical structure of an oxygen-depleted anticyclonic modewater eddy is investigated over a 2-month period using high-resolution glider and ship data. A weakly stratified eddy core (squared buoyancy frequency N2 ∼ 0.1 × 10-4 s-2) at shallow depth is identified with a horizontal extent of about 70 km...

The physical (temperature, salinity, velocity) and biogeochemical (oxygen, nitrate) structure of an oxygen depleted coherent, baroclinic, anticyclonic mode-water eddy (ACME) is investigated using high-resolution autonomous glider and ship data. A distinct core with a diameter of about 70 km is found in the eddy, extending from about 60 to 200 m dep...

The temporal evolution of the physical and biogeochemical structure of an oxygen-depleted anticyclonic mode-water eddy is investigated over a two-month period using high-resolution glider and ship data. A weakly stratified eddy core (squared buoyancy frequency N^2 ~ 0.1⋅10-4 s-2) at shallow depth is identified with a horizontal extend of about 70 k...

Geostrophic alongshore velocity data from a glider repetitive section off the coast of Peru (14°S) are used to study the cross-shore structure and temporal variability of the Peru current system during a five-week period in April-May 2010. Besides providing substantial information on the surface frontal jet associated with the Peru Coastal Current...

In April-May 2010, 6 consecutive repeated cross-shore sections of ~100 km were occupied by a Slocum glider off the coast of Pisco (14°S) in the southernmost Peruvian upwelling region. The collected temperature and salinity data, acquired from the surface to 1000m depth and the depth-integrated velocity, estimated from the glider drift between two d...

The upwelling system off southern Peru has been observed using an autonomous underwater vehicle (a Slocum glider) during October-November 2008. Nine cross-front sections have been carried out across an intense upwelling cell near 14°S. During almost two months, profiles of temperature, salinity, and fluorescence were collected at less than 1-km res...

The upwelling system off southern Peru has been observed using an autonomous underwater vehicle (a Slocum glider) during October–November 2008. Nine cross-front sections have been carried out across an intense upwelling cell near 148S. During almost two months, profiles of temperature, salinity, and fluorescence were collected at less than 1-km res...

The impact of intraseasonal coastal-trapped waves on the nearshore Peru ecosystem is investigated using observations and a regional eddy-resolving physical-ecosystem coupled model. Model results show that intraseasonal variability over the period 2000–2006 represents about one fourth of the total surface chlorophyll variance and one third of the ca...

The upwelling system off southern Peru has been observed using autonomous underwater vehicles (Slocum gliders) during two glider missions in October-November 2008 (Austral Spring) and April-May 2010 (Austral Autumn). Cross-front sections carried out in the intense upwelling cell near 14°S provide information on the geostrophic transport variability...