2. Introduction

This OceanGliders standard operating procedure (SOP) document for salinity aims to guide the user through the current community practices in use for measuring and deriving good quality salinity measurements using gliders. For the derivation of salinity, simultaneous measurements of conductivity, temperature and pressure are required, which are commonly acquired by conductivity-temperature-depth (CTD) sensors. The relative location of the conductivity, thermistor and pressure sensors, offsets in the time-responses of the sensors and the thermal-inertia effect impacts the derived variable, the correction for which is described in Section 8.

The first section describes the available sensors and their integration with gliders. The following sections outline general pre deployment / real time / post deployment and data dissemination protocol recommendations. Finally, the future outlook for salinity measurements by gliders is discussed.

2.1. Overview sensor glider combinations

Table 1: List of the known sensor/glider combinations we aim to cover in this document.

Sensor / Glider

Slocum

Autosub/ ALR (NOC)

Seaglider

Deepglider

SeaExplorer

Spray

AMT Petrel

Information

Sea-Bird - Glider Payload CTD, Slocum Glider CTD, Sea-Bird 41CP (pumped)

X Slocum specific

X

X

X

X Spray Specific

Link

Sea-Bird - CT-Sail (unpumped)

X

X

X

CT-Sail (provided by Sea-Bird on request)

RBRlegato3 (unpumped)

X

X

X

X

Link