PIES data collected north of the Canary Islands

Data from five PIES collected north of the Canary Islands from from 22 november 2022 to 12 december 2023

Technical Note: Description of PIES Data Files

Dataset Overview
This dataset includes measurements from five PIES (Pressure-Inverted Echo Sounders) deployed north of the Canary Islands. Data were collected over a 13-month period, from 22 November 2022 to 12 December 2023.

File Naming and Instrument Mapping
The correspondence between file names and PIES identifiers, as referenced in the manuscript, is as follows:

423.dat → PIES A

424.dat → PIES B

431.dat → PIES C

432.dat → PIES D

433.dat → PIES E

File Structure and Content
Each file contains time series data organized in rows and columns with the following structure:

Column 1 – Year Day (backward order)

Indicates the day of the year, starting from 12 December 2023 and proceeding backward in time.

Column 2 – Acoustic Travel Time (seconds)

Row 1: Most Significant Bits (MSB), with a resolution of 0.5 s.

Row 2: Least Significant Bits (LSB).

Column 3 – Pressure (decibars)

Row 1: MSB of pressure, scaled by a factor of 1000, with a resolution of 2 dbar.

Row 2: LSB.

Subsequent Columns – Telemetry Metadata

These columns include non-measurement data such as timestamps and system status information collected during telemetry transmission.

Remarks
Please note that for accurate reconstruction of travel time and pressure values, MSB and LSB must be combined appropriately following the instrument's encoding scheme.