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Conductivity, Temperature, and Depth (CTD) data from the OMG Mission

The OMG mission has released final CTD data via the Physical Oceanography DAAC collected from the following surveys:
— AXCTD data collected during a survey of Greenland's coastline in September and October 2016
— AXCTD data collected during a survey of Greenland's coastline in October 2017
— AXCTD data collected during a survey of Greenland's coastline in August and September 2018

The OMG mission has released preliminary CTD data collected from Greenland's coastline in August and September 2019 during the AXCTD probe campaign. See the OMG CTD 2019 Data Points file which provides a map-based view of the CTD data collection points when loaded into the Google Earth application.

The OMG mission has also released preliminary CTD data collected from Greenland's coastline in July, August and September 2015 as well as August, September and October of 2016 during the TerraSond Bathymetry, Ocean Research Project and Arctic Access / UCI surveys. See the Data Access links below.

Although this data will not likely be updated, the project plans to combine this data with additional CTD data in order to generate higher-level products. If you discover any anomalies or inconsistencies with the data or documentation, please let us know by contacting the Principle Investigator for the mission.

            The following Level 1 products have been updated since their initial release in order to correct an error in position or removal             of bad data at the end of the file:
                ‐ OMG_09162016145103_Ch14_431.edf was updated on January 30, 2019
                ‐ OMG_09282016133513_Ch12_453.edf was updated on January 30, 2019
                ‐ OMG_20180904120012_CH12_431.edf was updated on January 30, 2019
            If you had previously downloaded these products, please download them again and replace your local copy.

Information

DOI

10.5067/OMGEV-AXCTD

Short Name

OMG_Ocean_CTD

Long Name

OMG Ocean CTD Data

Description

Global sea level rise will be one of the major environmental challenges of the 21st Century. Oceans Melting Greenland (OMG) will pave the way for improved estimates of sea level rise by addressing the question: To what extent are the oceans melting Greenland’s ice from below? Over a five-year campaign, OMG will observe changing water temperatures on the continental shelf surrounding Greenland, and how marine glaciers react to the presence of warm, salty Atlantic Water. The complicated geometry of the sea floor steers currents on the shelf and often determines whether Atlantic Water can reach into the long narrow fjords and interact with the coastal glaciers. Because knowledge of these pathways is a critical component of modeling the interaction between the oceans and ice sheet, OMG will facilitate improved measurements of the shape and depth of the sea floor in key regions as well.

Temperature and salinity data are collected primarily using air-deployed sensors called Airborne eXpendable Conductivity Temperature Depth (AXCTD) instruments. These expendable instruments are launched from an aircraft, fall under a small parachute and float on the surface after impact. The floating portion then release a probe, which sinks to a depth of up to 1000 meters. The probe is connected to the float by a thin wire which unspools at the probe sinks, measuring temperature and conductivity as a function of time. This information is sent by radio to the aircraft, where it is used to compute temperature and salinity as a function of depth. In addition, during the ship survey more traditional lowered CTD data was collected. These instruments measure temperature and conductivity as a function of pressure and the data is downloaded and stored when the instrument returns is taken out of the water.

Version

0.1

Measurement

Oceans > Bathymetry/Seafloor Topography > Water Depth
Oceans > Ocean Temperature > Water Temperature
Oceans > Salinity/Density > Conductivity
Oceans > Salinity/Density > Salinity

Platform/Sensor

Grumman Gulfstream III (G-III)	Airborne eXpendable Conductivity Temperature Depth (AXCTD)
C-130 Hercules	Airborne eXpendable Conductivity Temperature Depth (AXCTD)
Basler BT-67	Airborne eXpendable Conductivity Temperature Depth (AXCTD)
M/V Ivilia vessel operated by Arctic Access / UCI	AML Oceanographic Minos X CTD
M/V Cape Race vessel operated by TerraSond Limited	AML Oceanographic Minos X CTD Teledyne Oceanscience Underway CTD
M/V Neptune vessel operated by TerraSond Limited	AML Oceanographic Minos X CTD Valeport Rapid CTD
R/V Ault vessel operated by Ocean Research Project	RBRconcerto CTD

Project

Oceans Melting Greenland (OMG)

Data Access
Portal	OMG CTD Data Points This file provides a map-based view of the CTD data collection points when loaded into the Google Earth application. OMG Ocean AXCTD Level 1 Data OMG Ocean AXCTD Level 2 Data (available from PO.DAAC) OMG Ocean AML CTD Level 0 Raw Data OMG Ocean Teledyne CTD Level 0 Raw Data OMG Ocean Valeport CTD Level 0 Raw Data OMG Ocean RBR CTD Level 0 Raw Data
Format	ASCII EDF ASCII CSV NetCDF

Citation
Citation	OMG Mission. 2016. Conductivity, Temperature and Depth (CTD) data from the ocean survey. Ver. 0.1. OMG SDS, CA, USA. Dataset accessed [YYYY-MM-DD] at http://dx.doi.org/10.5067/OMGEV-AXCTD.