SEARCH^Arctic CMG GT-2A Gravimeter Level 2 Geolocated Free Air Gravity Disturbance Transect Data

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Thomas G. Richter; Anja Rutishauser; Dillon P. Buhl; Enrica Quartini; Duncan A. Young; Donald D. Blankenship, 2024, "SEARCH^Arctic CMG GT-2A Gravimeter Level 2 Geolocated Free Air Gravity Disturbance Transect Data", https://doi.org/10.18738/T8/OQWRKP, Texas Data Repository, V1

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Description	Gravity disturbances measured over Devon Ice Cap in June 2019, using the Transparent Earth Geophysics GT-2A gravimeter S/N 18 aboard the Basler BT-67 C-GJKB. The GT-2A is a three axis stabilized gravity meter using a vertically oriented precision accelerometer/gravity sensor. Data were processed using the GTGRAV proprietary software developed with the GT-2A. Aircraft dynamic accelerations were derived using PPP processing of carrier phase GPS data by NovAtel GrafNav commercial software. A low pass filter with cutoff of 1/150 Hz was implemented in the GTGRAV software for rejection of short wavelength noise. The final result is the disturbance relative to the GRS-80 conventional series formula for the global gravity field corrected with the 1967 international free air correction formula, GRS80 normal gravity = 9.780327 * (1 + 0.00530 sin^2 (LAT)- 0.0000058 sin^2 (2 * LAT)) m/s^2 Free Air Correction = (0.308768-0.000440sin^2(LAT) - 0.000000144AC_ELEVATION)*AC_ELEVATION. No line leveling or other fitting has been applied to the data. The data were referenced to a gravity tie at Resolute Airport of 982847.8 mGal. Three flights were flown from Resolute Airport as the SRH2 survey. Data were subsequently remapped onto flight lines from the 2018 SRH1 survey; time stamps in data refer to those earlier flights. (2023-07-14)
Subject	Earth and Environmental Sciences
Keyword	Gravity anomaly
Related Publication	Killingbeck, S., Unsworth, M., Young, D. A., Rutishauser, A., Yan, S., Beem, L. H., Richter, T. G., Blankenship, D. D., Dubnick, A., Criscitiello, A., {Vestrum, Zoe}, Greenbaum, J., and Dow, C., Integrating gravity, magnetic and magnetotelluric data over {Devon Ice Cap, Canadian Arctic}, to estimate the subglacial geology, accepted, Journal of Geophysical Research (Solid Earth)doi: 10.1029/2024JB028929
License/Data Use Agreement	CC0 1.0

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Citation Metadata

Persistent Identifier	doi:10.18738/T8/OQWRKP
Publication Date	2024-12-31
Title	SEARCH^Arctic CMG GT-2A Gravimeter Level 2 Geolocated Free Air Gravity Disturbance Transect Data
Author	Thomas G. RichterUniversity of Texas Institute for Geophysics University of Texas Institute for Geophysics; now Geological Survey of Denmark and Greenland0000-0002-1819-8014 University of Texas Institute for Geophysics0000-0001-8729-0597 University of Texas Institute for Geophysics; now Cornell University0000-0001-7485-543X University of Texas Institute for Geophysics0000-0002-6866-8176 University of Texas Institute for Geophysics0000-0003-0205-4830
Point of Contact	Use email button above to contact. Young, Duncan (University of Texas at Austin)
Description	Gravity disturbances measured over Devon Ice Cap in June 2019, using the Transparent Earth Geophysics GT-2A gravimeter S/N 18 aboard the Basler BT-67 C-GJKB. The GT-2A is a three axis stabilized gravity meter using a vertically oriented precision accelerometer/gravity sensor. Data were processed using the GTGRAV proprietary software developed with the GT-2A. Aircraft dynamic accelerations were derived using PPP processing of carrier phase GPS data by NovAtel GrafNav commercial software. A low pass filter with cutoff of 1/150 Hz was implemented in the GTGRAV software for rejection of short wavelength noise. The final result is the disturbance relative to the GRS-80 conventional series formula for the global gravity field corrected with the 1967 international free air correction formula, GRS80 normal gravity = 9.780327 * (1 + 0.00530 sin^2 (LAT)- 0.0000058 sin^2 (2 * LAT)) m/s^2 Free Air Correction = (0.308768-0.000440sin^2(LAT) - 0.000000144AC_ELEVATION)*AC_ELEVATION. No line leveling or other fitting has been applied to the data. The data were referenced to a gravity tie at Resolute Airport of 982847.8 mGal. Three flights were flown from Resolute Airport as the SRH2 survey. Data were subsequently remapped onto flight lines from the 2018 SRH1 survey; time stamps in data refer to those earlier flights. (2023-07-14)
Subject	Earth and Environmental Sciences
Keyword	Gravity anomaly
Related Publication	Killingbeck, S., Unsworth, M., Young, D. A., Rutishauser, A., Yan, S., Beem, L. H., Richter, T. G., Blankenship, D. D., Dubnick, A., Criscitiello, A., {Vestrum, Zoe}, Greenbaum, J., and Dow, C., Integrating gravity, magnetic and magnetotelluric data over {Devon Ice Cap, Canadian Arctic}, to estimate the subglacial geology, accepted, Journal of Geophysical Research (Solid Earth) doi 10.1029/2024JB028929
Production Date	2023-06-29
Production Location	Devon Island (Tallurutit), Nunavut, Canada
Funding Information	Weston Family Foundation G. Unger Vetlesen Foundation
Depositor	Young, Duncan
Deposit Date	2023-07-14
Date of Collection	Start Date: 2019-05-30 ; End Date: 2019-06-04
Data Type	Geolocated tabular data

Geospatial Metadata

Geographic Coverage	Canada, Nunavut, Devon Island
Geographic Bounding Box	-86 -80 76 74

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