Field Activity 1963-001-FA

Identifier 1963-001-FA
Purpose Acquisition of marine heat flow data and associated sediment cores and thermal measurements from T-3 Fletcher's ice island as it circulated through the Western Arctic for nearly a decade.
Location Western Arctic Ocean, between Alpha-Mendeleev Ridge and Greenland margin
Summary A total of 584 casts were made from T-3 to measure heat flow. Approximately 1.486 km of core was obtained from 546 of these. The remaining 38 casts included 2 that had rocks stuck in the coring tip, 3 where the complete probe was lost, and 2 where the cores were lost. Thermal gradients, thermal conductivity values, and heat flow data were successfully acquired for 356 stations.
Info derived thermal gradients, in situ radiogenic heat content, sediment characterization, bottom water temperatures in Western Arctic Ocean
Comments Please make lead organization just generic: "USGS" Please make lead scientists Arthur Lachenbruch and Vaughn Marshall, with no emails attached. We may change that later after I speak with Art, who is very elderly. Please put me on as the contact person/alternate personnel and have my email linked to this activity. The exact number of days in the field is probably over 2000. As we finalize this FA, I will try to calculate the total number of days more accurately. The "platform" is literally a floating ice island called T-3/Fletcher's Ice Island.
T-3, also known as Fletcher’s Ice Island, was a large iceberg in the Arctic Ocean used for many years as a scientific research facility by the United States Government.
Start none (on ice floe) 1963-02-01
End none (on ice floe) 1973-11-30
Days in the field 1500
West -179.5703125
East -52.2265625
North 84.89369594
South 73.67953518


384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
12201 Sunrise Valley Drive
Reston, VA20192
Principal investigators Lachenbruch, ArthurMarshall, Vaughn
Crew members
(not identified)
Scientist, Staff
Information specialist(s)
Carolyn Ruppel
Specialist, Information

Data types and categories

Data category: Environmental Data
Data type: Temperature

Documents: Notes and log books

Name Description
Post-expedition report for USGS T-3 ice island heat flow measurements in the High Arctic Ocean, 1963-1973 Previously unpublished report from the 1970s, including heat flow measurements and radiogenic heat determinations in the High Arctic Ocean collected from 1963 to 1973. The report contains both valuable scientific information as well as data.

Equipment used

Equipment Usage description Data types Datasets
Heat flow Temperature 4


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Radiogenic heat content for selected cores Heat flow Radiogenic heat content at 26 locations where heat flow measurements were attempted by the USGS in the Arctic Ocean between 1963 and 1973. Carolyn Ruppel
T-3 Ice Island one hour navigation: May 14, 1962 to September 15, 1974 Heat flow 1-hour navigational data and some gravity anomaly and magnetic anomaly data for the T-3 ice island circuit of the Amerasian Basin from 1962 to 1974. Carolyn Ruppel
USGS T-3 enhanced thermal data from T-3 Ice Island Heat flow Enhanced version of the T-3 heat flow data with additional information about the heat flow stations and conversions to SI units. Carolyn Ruppel
USGS T-3 Original thermal gradient, thermal conductivity, and heat flow data from T-3 Ice Island Heat flow Digital version of the original data table recording the T-3 thermal gradients, thermal conductivity values, and heat flow for the 356 successful stations. Carolyn Ruppel


Samples collected during this field activity