Controlled Flux Technique (CFT) data for the SPURS-2 E. Tropical Pacific field campaign R/V Revelle cruises

Controlled Flux Technique (CFT) data for the SPURS-2 E. Tropical Pacific field campaign R/V Revelle cruises
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Short NameSPURS2_CFT
DescriptionThe SPURS (Salinity Processes in the Upper Ocean Regional Study) project is NASA-funded oceanographic process study and associated field program that aim to elucidate key mechanisms responsible for near-surface salinity variations in the oceans. The project involves two field campaigns and a series of cruises in regions of the Atlantic and Pacific Oceans exhibiting salinity extremes. SPURS employs a suite of state-of-the-art in-situ sampling technologies that, combined with remotely sensed salinity fields from the Aquarius/SAC-D, SMAP and SMOS satellites, provide a detailed characterization of salinity structure over a continuum of spatio-temporal scales. The SPURS-2 campaign involved two month-long cruises by the R/V Revelle in August 2016 and October 2017 combined with complementary sampling on a more continuous basis over this period by the schooner Lady Amber. Focused around a central mooring located near 10N,125W, the objective of SPURS-2 was to study the dynamics of the rainfall-dominated surface ocean at the western edge of the eastern Pacific fresh pool subject to high seasonal variability and strong zonal flows associated with the North Equatorial Current and Countercurrent. The Controlled Flux Technique (CFT) is a system for measuring the net heat transfer velocity and turbulent kinetic energy (TKE) dissipation at the ocean surface, and is a useful tool for studying the turbulence generated at the ocean surface by the impact of raindrops. CFT was employed during both SPURS-2 Revelle cruises. It involves a laser heating a small patch of water on the ocean surface, and an infrared imaging camera then tracking the resulting thermal decay. This decay is known to be proportional to the dissipation of TKE at the water surface, which in turn can be used to scale the transfer velocity for the net heat flux. SPURS2 CFT data take the form of a series of .raw video files each with corresponding .met text header files containing the associated file metadata. The CFT data was recorded at 15 frames per second (fps) during the first Revelle cruise in 2016, and at 25 fps during the second in 2017. Matlab CFT reader software are provided by UW/APL and distributed here with the CFT data files.
Dataset TypeOPEN
Processing Level2
CoverageRegion: Eastern Tropical Pacific
Northernmost Latitude: 21.26 degrees
Southernmost Latitude: 5.06 degrees
Westernmost Longitude: -157.88 degrees
Easternmost Longitude: -118.32 degrees
Time Span: 2016-Aug-24 to 2017-Nov-11
ResolutionSpatial Resolution: 0 km (Along) x 0 km (Across)
ProjectionType: WGS84
Latency hours
Swath Width0.001 km
Sample Frequency15
Temporal Repeat (Nominal)-
Temporal Repeat (Min)-
Temporal Repeat (Max)-
R/V Revelle
Name: R/V Roger Revelle (SIO) (R/V Revelle)
Orbit Period: 0 minutes
Inclination Angle: 0 degrees
Ascending Node: 1970-Jan-01 00:00:00
Name: Heitronics Wing IR Pyrometer (PYROMETERS)
Swath Width: 0.001 km
Description: Saildrone Heitronics Wing IR Pyrometer (12261)

ProjectNASA Salinity Processes in the Upper Ocean Regional Study (SPURS)
Data ProviderCreator: W. Asher
Release Place: Applied Physics Laboratory, University of Washington, 1013 NE 40th St, Seattle, WA 98105
Release Date: 2019-Jul-31
Keyword(s)CFT, Controlled Flux Technique, laser, turbulent kinetic energy, turbulence, infrared, video, Upper Ocean, SPURS2, Eastern Tropical Pacific, ITCZ region, Cruises, Revell, insitu, SPURS
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Project Materials
SPURS-2 CFT dataset documentation (2016)
SPURS-2 CFT dataset documentation (2016)
SPURS-2 CFT dataset documentation (2017)
SPURS-2 CFT dataset documentation (2017)
SPURS-2 Data Documentation Package
Data Submission Report, Instrument Calibration Report, etc
SPURS-2 Cruise Documentation Package
Cruise Reports
Additional Sites
PO.DAAC SPURS Mission page
Field Campaign and Instrument Overview
SPURS Project Website
Project Website for SPURS
Citation W. Asher. 2019. Controlled Flux Technique (CFT) data for the SPURS-2 E. Tropical Pacific field campaign R/V Revelle cruises. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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For more information see Data Citations and Acknowledgments.

Journal Reference Asher, W. E., A. T. Jessup, and M. A. Atmane (2004), Oceanic application of the active controlled flux technique for measuring air-sea transfer velocities of heat and gases, J. Geophys. Res., 109(C08S12), doi: 10.1029/2003JC001862