Ralf Krocker, Karsten Gohl
2007-02
Marine Gravimetry along the track of R.V. POLARSTERN cruise ANT-XVIII/5a
gzip compressed, space delimited ASCII file
http://dx.doi.org/10.1594/PANGAEA.602273
Gravity
The gravimetric measurements have been executed during R.V. POLARSTERN cruise ANT-XVIII/5a.
The used gravity sensor was a KSS31 of Bodenseewerk Überlingen, Germany.
The additional measurements for gravimetric datum shift have been executed using a Lacoste/Romberg gravity meter. Referenced gravity fix points are located in Rothera, Base Station (Adelide Island) and Punta Arenas, Centro Administratum del Puerto (Chile).
Positions have been measured by GPS. Ships orientation and rotation angles have been measured by Marine Inertial Navigation System (MINS).
Simple Bougueranomalies have been calculated by reducing Bouguerplate with density of 2.67 g/cm^3 (and density contrast of 1.64 g/cm^3 respectively). Used bathymetry has been sampled with swath sonar system Hydrosweep DS2 and is also be published in PANGAEA database.
Missing data are represented by 999999.0 (gravity) and 0.0 (bathymetry).
The gravimetric measurements have been sampled to support geophysical and geological interpretations of Mary Byrd Sea Mounds, Peter I. Island and the Eltanin Impact Area during R.V. POLARSTERN cruise ANT-XVIII/5a. Gravimetry has also been accomplished to expand existing datasets.
None
en
2001-02-28
13:39:00
2001-04-10
23:59:50
2007-02-05
None planned
-122.0531
-68.0960
-53.1259
-70.8182
None
Gravity
Eltanin Impact
Meteorite
Crater
None
South Pacific
Bellinghausen Sea
Amundsen Sea
Peter I Island
Marie Byrd Seamounts
Eltanin Impact Area
None
None. Acknowlegdement of the Alfred Wegener Institute would be appreciated in products derived from these data.
Wilfried Jokat
Alfred Wegener Institute for Polar and Marine Research
mailing address
Postfach 120161
Bremerhaven
Bremen
27515
Germany
(+49)471-4831-1211
(+49)471-4831-1926
Wilfried.Jokat@awi.de
email is the preferred contact
None
Unclassified
None
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4
Ralf Krocker
2007
Interpretation of the geological structure at the Eltanin Impact Area based on a combined gravimetric-bathymetric model
PhD-Thesis, University Bremen, published in: Reports on Polar and Marine Research
Hardcopy
Space delimited ASCII file
Gravity measurements have been executed by Sea Gravity Meter KSS31 of Bodenseewerk Überlingen, Germany. Accuracy of anomalies amounts to 1 mgal.
1
Accuracy in mgal refers to filtered anomalies, but not to single datapoints. Filtering should be done in dependence of the waterdepth and resulting attenuation of gravity signal.
complete
Positions are measured by two GPS antennas. Ships orientation and rotation is measured by Marine Inertial Navigational System (MINS) and applied to positions. Accuracy of Positions amounts to +-10 meters.
Gravity data as well as navigational and bathymetric data have been stored and merged in Polarstern Data Archival System (PODAS)
2001
Datum Shift has been applied in relation to gravity fix points of Rothera, Base Station (Adelide Island) and Punta Arenas, Centro Administratum del Puerto (Chile)
2001
Eötvös-corrections have been applied
2001
Free Air Anomalies have been calculated by subtracting normal gravity of GRS80
2001
Simple Bougueranomalies have been calculated by reducing a Bouguer Plate with density of 2.67 g/cm^3 (and density contrast of 1.64 g/cm^3 respectively)
2001
Data have been reformatted into space delimited ASCII files, containing a time periode of 24 hours each and sampling interval of 10 seconds.
2007
Datasampling has been done along ship track. Therefore it is irregular in space
Point
String
359604
0.00001
0.00001
Decimal Degrees
WGS84
6378137
298.25722
Gravity
Identifier
AWI internal Polarstern cruise identifier
Author
This attribute is always the same within one cruise
8
Date
UTC date string (YYYY/MM/DD)
GPS / PODAS
10
Time
UTC time string: (hh:mm:ss)
GPS / PODAS
10
Latitude
Geographical coordinate in decimal degrees
GPS / PODAS
decimal degrees
9
Longitude
Geographical coordinate
GPS / PODAS
decimal degrees
10
Depth
Sea floor depth measured by Swath Sonar System Hydrosweep DS2
HYDROSWEEP DS2
-6942
-57
meter
7
FreeAirAnomaly
Anomaly related to GRS80
Author
-141.3
180.5
milligal
9
BouguerAnomaly
Bouguer plate correction with density contrast between crust and water of 1.64 g/cm^3
Author
-40.7
477.9
milligal
9
Wilfried Jokat
Alfred Wegener Institute for Polar and Marine Research
mailing address
Postfach 120161
Bremerhaven
Bremen
27515
Germany
(+49)471-4831-1211
(+49)471-4831-1926
Wilfried.Jokat@awi.de
None
1
2007-01-31
gzip
5.564.102
No fees for digital files
2007-02-06
Ralf Krocker
Alfred Wegener Institute for Polar and Marine Research
mailing address
Postfach 120161
Bremerhaven
Bremen
27515
Germany
(+49)471-4831-1226
(+49)471-4831-1977
infobathy@awi-bremerhaven.de
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
en