Satellite mapping of the Antarctic gravity field
The production and analysis of the Antarctic digital magnetic anomaly map will be greatly aided by complementary gravity data. They help to constrain thickness variations of the crust and related magnetic effects that may be used for correcting long-wavelength errors in near-surface magnetic survey...
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ftjaog:oai:ojs.annalsofgeophysics.eu:article/3718 2023-05-15T13:54:52+02:00 Satellite mapping of the Antarctic gravity field von Frese, R. R. B. Roman, D. R. Kim, J. H. Kim, J. W. Anderson, A. J. 1999-11-25 application/pdf https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 https://doi.org/10.4401/ag-3718 eng eng Istituto Nazionale di Geofisica e Vulcanologia, INGV https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718/3782 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 doi:10.4401/ag-3718 Annals of Geophysics; V. 42 N. 2 (1999) Annals of Geophysics; Vol. 42 No. 2 (1999) 2037-416X 1593-5213 ADMAP gravity Antarctic satellite altimetry 04.02.05. Downhole radioactivity remote sensing and other methods info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1999 ftjaog https://doi.org/10.4401/ag-3718 2022-03-27T06:36:31Z The production and analysis of the Antarctic digital magnetic anomaly map will be greatly aided by complementary gravity data. They help to constrain thickness variations of the crust and related magnetic effects that may be used for correcting long-wavelength errors in near-surface magnetic survey compilations. They also limit ambiguities in geological interpretations of magnetic anomalies. Antarctic free-air gravity anomalies are available from the 1° Earth Gravity Model 1996 (EGM96). These coefficients satisfy gravity estimates from satellite radar altimetry, as well as surface or near-surface measurements in roughly 75% of the 30 arc-minute blocks south of 60°S. For the remaining blocks, the EGM96 predictions are limited in resolution to degree 70 based on satellite orbital analyses. Anomaly predictions over the unsurveyed regions of the Antarctic will be greatly improved by additional orbital measurements from the pending low-altitude (i.e., 150-500 km) CHAMP and GRACE satellite missions of ESA and NASA, respectively. Shorter wavelength anomalies are available from Geosat and ERS-1 & 2 radar altimetry data for marine regions away from the shoreline that compare very well with modern, good-quality shipborne data. Over the Gunnerus Ridge region, for example, satellite altimetry-derived free-air gravity predictions at a 3-5 km grid interval have an accuracy of about 3 mgals or less. Article in Journal/Newspaper Antarc* Antarctic Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) Antarctic The Antarctic Gunnerus Ridge ENVELOPE(33.750,33.750,-66.500,-66.500) |
institution |
Open Polar |
collection |
Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftjaog |
language |
English |
topic |
ADMAP gravity Antarctic satellite altimetry 04.02.05. Downhole radioactivity remote sensing and other methods |
spellingShingle |
ADMAP gravity Antarctic satellite altimetry 04.02.05. Downhole radioactivity remote sensing and other methods von Frese, R. R. B. Roman, D. R. Kim, J. H. Kim, J. W. Anderson, A. J. Satellite mapping of the Antarctic gravity field |
topic_facet |
ADMAP gravity Antarctic satellite altimetry 04.02.05. Downhole radioactivity remote sensing and other methods |
description |
The production and analysis of the Antarctic digital magnetic anomaly map will be greatly aided by complementary gravity data. They help to constrain thickness variations of the crust and related magnetic effects that may be used for correcting long-wavelength errors in near-surface magnetic survey compilations. They also limit ambiguities in geological interpretations of magnetic anomalies. Antarctic free-air gravity anomalies are available from the 1° Earth Gravity Model 1996 (EGM96). These coefficients satisfy gravity estimates from satellite radar altimetry, as well as surface or near-surface measurements in roughly 75% of the 30 arc-minute blocks south of 60°S. For the remaining blocks, the EGM96 predictions are limited in resolution to degree 70 based on satellite orbital analyses. Anomaly predictions over the unsurveyed regions of the Antarctic will be greatly improved by additional orbital measurements from the pending low-altitude (i.e., 150-500 km) CHAMP and GRACE satellite missions of ESA and NASA, respectively. Shorter wavelength anomalies are available from Geosat and ERS-1 & 2 radar altimetry data for marine regions away from the shoreline that compare very well with modern, good-quality shipborne data. Over the Gunnerus Ridge region, for example, satellite altimetry-derived free-air gravity predictions at a 3-5 km grid interval have an accuracy of about 3 mgals or less. |
format |
Article in Journal/Newspaper |
author |
von Frese, R. R. B. Roman, D. R. Kim, J. H. Kim, J. W. Anderson, A. J. |
author_facet |
von Frese, R. R. B. Roman, D. R. Kim, J. H. Kim, J. W. Anderson, A. J. |
author_sort |
von Frese, R. R. B. |
title |
Satellite mapping of the Antarctic gravity field |
title_short |
Satellite mapping of the Antarctic gravity field |
title_full |
Satellite mapping of the Antarctic gravity field |
title_fullStr |
Satellite mapping of the Antarctic gravity field |
title_full_unstemmed |
Satellite mapping of the Antarctic gravity field |
title_sort |
satellite mapping of the antarctic gravity field |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia, INGV |
publishDate |
1999 |
url |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 https://doi.org/10.4401/ag-3718 |
long_lat |
ENVELOPE(33.750,33.750,-66.500,-66.500) |
geographic |
Antarctic The Antarctic Gunnerus Ridge |
geographic_facet |
Antarctic The Antarctic Gunnerus Ridge |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Annals of Geophysics; V. 42 N. 2 (1999) Annals of Geophysics; Vol. 42 No. 2 (1999) 2037-416X 1593-5213 |
op_relation |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718/3782 https://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 doi:10.4401/ag-3718 |
op_doi |
https://doi.org/10.4401/ag-3718 |
_version_ |
1766261009176068096 |