Frontal surveys during Calypso: SADCP, UCTD, and SOLO-II profiling floats

Date 2022
Author(s) Johnston ShaunORCID1, Calafat Noemí2, Casas BenjamínORCID2, Cutolo EugenioORCID3, Falcieri FrancescoORCID4, Lizarán IreneORCID2, Pascual AnandaORCID3, Reynard Nick5, Tintoré JoaquínORCID2, 3
Affiliation(s) 1 : Scripps Institution of Oceanography (SIO); University of California, San Diego (UCSD)
2 : Balearic Islands Coastal Ocean Observing and Forecasting System (SOCIB)
3 : Mediterranean Institute for Advanced Studies (IMEDEA), Consejo Superior de Investigaciones Científicas (CSIC), Universitat de les Illes Balear (UIB)
4 : Institute of Marine Science (ISMAR), National Research Council (CNR)
5 : Imperial College
DOI 10.17882/90114
Publisher SEANOE
Keyword(s) ADCP, CTD, subsurface currents, temperature, salinity, fronts, eddies, upwelling/downwelling
Abstract

This is the third cruise for the US Office of Naval Research’s Coherent Lagrangian Pathways from the Surface Ocean to Interior (Calypso) project.  The program is motivated by the understanding that the vertical movement of water from the surface to depth across the base of the mixed layer has implications for the transport of properties, gases, biogeochemistry, and the fate of drifting particles/objects. However, vertical velocities are weak (about a thousand times smaller than horizontal velocities) and difficult to detect. To represent these motions we need to answer the following questions: (1) How are water and properties from the surface boundary layer exported to depth?  (2) What coherent pathways act as conduits for exchange? (3) What dynamics shapes these pathways? (4) What are the Lagrangian trajectories? (5) What are the time and space scales of subduction? (6) Where does the water end up?  (7) Can we predict these pathways in 3 dimensions and what data are needed to aid or constrain predictive models?  Previous work has established the theoretical basis for predicting coherent Lagrangian structures in the ocean. Confirmation of the predictive theory has only been accomplished in the horizontal dimension and the observational study and confirmation of predictive theories for 3D plus time have not yet been demonstrated.

Calypso aims to: (1) Establish an understanding and predictive capability of the three-dimensional coherent pathways by which water carrying tracers and drifting objects is transported from the surface ocean to depths below the mixed layer. (2) Design and implement an observational study to test the theories, hypothesis, and predictions of the 3-D, time-evolving Lagrangian pathways.

Due to the need to sample across a range of scales, we have set up this two-ship study with numerous autonomous and Lagrangian platforms.  Eurofleets+ helped the observational program succeed via the award of ship time on R/V Pelagia.  During the cruise, most of the operations from R/V Pelagia focussed on repeat surveys at a front and a cyclonic eddy to the NE of the front with a variety of ship-based measurements and autonomous platforms.  Two-ship operations combined repeat small-scale surveys by R/V Pelagia , which were embedded within larger scale surveys by R/V Pourquois Pas.  

Licence CC-BY-NC-SA
Sensor metadata

1.  Teledyne Oceanscience Underway CTD (UCTD) with Seabird UCTD probes and Valeport Rapidcast probes

2.  SOLO-II profiling floats

3.  Teledyne RDI Workhorse 75 kHz vessel-mounted ADCP

Data
File Size Format Processing Access
7 MB NC, NetCDF Processed data Access on demand until 2024-03-11
1 MB NC, NetCDF Processed data Access on demand until 2024-03-11
1 MB NC, NetCDF Processed data Access on demand until 2024-03-11
2 MB NC, NetCDF Processed data Access on demand until 2024-03-11
1 MB NC, NetCDF Processed data Access on demand until 2024-03-11
1 MB NC, NetCDF Processed data Access on demand until 2024-03-11
2 MB NC, NetCDF Processed data Access on demand until 2024-03-11
2 MB NC, NetCDF Processed data Access on demand until 2024-03-11
2 MB NC, NetCDF Processed data Access on demand until 2024-03-11
2 MB NC, NetCDF Processed data Access on demand until 2022-03-11
460 KB NC, NetCDF Processed data Access on demand until 2024-03-11
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How to cite 

Johnston Shaun, Calafat Noemí, Casas Benjamín, Cutolo Eugenio, Falcieri Francesco, Lizarán Irene, Pascual Ananda, Reynard Nick, Tintoré Joaquín (2022). Frontal surveys during Calypso: SADCP, UCTD, and SOLO-II profiling floats. SEANOE. https://doi.org/10.17882/90114