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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ftdoajarticles:oai:doaj.org/article:c0f68ab8c5db444f8c7b1f5d4eb61086 2023-05-15T14:00:35+02:00 Satellite mapping of the Antarctic gravity field J. W. Kim A. J. Anderson J. H. Kim D. R. Roman R. R. B. von Frese 1999-06-01T00:00:00Z https://doi.org/10.4401/ag-3718 https://doaj.org/article/c0f68ab8c5db444f8c7b1f5d4eb61086 EN eng Istituto Nazionale di Geofisica e Vulcanologia (INGV) http://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3718 1593-5213 2037-416X https://doaj.org/article/c0f68ab8c5db444f8c7b1f5d4eb61086 Annals of Geophysics, Vol 42, Iss 2 (1999) ADMAP gravity Antarctic satellite altimetry Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.4401/ag-3718 2022-12-31T12:52:50Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Gunnerus Ridge ENVELOPE(33.750,33.750,-66.500,-66.500) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ADMAP gravity Antarctic satellite altimetry Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
ADMAP gravity Antarctic satellite altimetry Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 J. W. Kim A. J. Anderson J. H. Kim D. R. Roman R. R. B. von Frese Satellite mapping of the Antarctic gravity field |
topic_facet |
ADMAP gravity Antarctic satellite altimetry Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
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 |
J. W. Kim A. J. Anderson J. H. Kim D. R. Roman R. R. B. von Frese |
author_facet |
J. W. Kim A. J. Anderson J. H. Kim D. R. Roman R. R. B. von Frese |
author_sort |
J. W. Kim |
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://doi.org/10.4401/ag-3718 https://doaj.org/article/c0f68ab8c5db444f8c7b1f5d4eb61086 |
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, Vol 42, Iss 2 (1999) |
op_relation |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/3718 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-3718 1593-5213 2037-416X https://doaj.org/article/c0f68ab8c5db444f8c7b1f5d4eb61086 |
op_doi |
https://doi.org/10.4401/ag-3718 |
_version_ |
1766269809641652224 |