SWIFT data collected in the Southern California Bight by SWIFT drifters as part of the ONR Langmuir Circulation Departmental Research Initiative (LC-DRI)

This is the public archive for ADCP data collected with SWIFT drifters and Mixed-Layer Floats during the 'Langmuir Circulation' Office of Naval Research Departmental Research Initiative (LC-DRI) field experiment, conducted between March 19th and April 6th, 2017 in the Southern California Bight 40 km west of Catalina Island. The floats and drifters were deployed and recovered from the R/V R.G. Sproul during cruise SP1709 (Cruise DOI: 10.7284/907464). SWIFTs were deployed during storms with wind speeds up to 20 m/s and sampled strong diurnal warm layers during weaker wind periods., SWIFT drifters were deployed at the ocean surface and collected measurements of near-surface velocity in a surface following reference frame using high-resolution acoustic Doppler current profilers (ADCPs), Nortek Signature 1000s. Mixed-layer Floats control their bouyancy to profile vertically in the ocean, and measured conductivity, temperature and density measurements. Also contained in this file are raw ADCP data --  subject to minimal quality control onboard the SWIFTs, but are otherwise unprocessed other than conversion from binary. This 'raw' data is available for turbulence estimates. The .zip file contains .mat files with data and a READ ME (.txt file) describing the data format. Processing codes for the SWIFT-mounted Signature 1000s can be found here: https://github.com/SASlabgroup/SWIFT-codes/tree/master/Signature., Matlab is required to open the data files (.mat files) included in this archive., # SWIFT Data collected in the Southern California Bight by SWIFT drifters as part of the ONR Langmuir Circulation Departmental Research Initiative (LC-DRI)

The data contained in this archive are quality controlled SWIFT data and MLF data, as well as raw high-resolution velocity data collected with SWIFT drifters (Thomson et. al. 2012) in the Southern California Bight in March and April of 2017.

## Description of the processed SWIFT and MFL data and file structure

Two structures, 'swift', and 'mlf' are contained in LCDRI_dryad.mat. These data structures contain substructures (fields) with the processed data collected by individual instruments. Substructures are named by their serial number and the date the data collection began. For example, 'swift.SN250404' contains data collected by SWIFT 25, beginning April 04.

**SWIFT Structure Variables**
time: time (matlab datetime)
lon: longitude (degrees N)
lat: latitude (degrees E)
driftspd: drift speed (m/s)
driftu: drift zonal velocity (m/...