Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method
The downward continuation (DWC) method was used to determine the density contrast between the seawater and the ocean bottom topographic mass to estimate accurate bathymetry using the gravity-geologic method (GGM) in two study areas, which are located south of Greenland (Test Area #1: 40 - 50 degrees...
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ftnctuniv:oai:ir.nctu.edu.tw:11536/23235 2023-05-15T16:29:36+02:00 Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method Hsiao, Yu-Shen Kim, Jeong Woo Kim, Kwang Bae Lee, Bang Yong Hwang, Cheinway 土木工程學系 Department of Civil Engineering 2011-06-01 http://hdl.handle.net/11536/23235 https://doi.org/10.3319/TAO.2010.10.13.01(Oc en_US eng 1017-0839 http://dx.doi.org/10.3319/TAO.2010.10.13.01(Oc) http://hdl.handle.net/11536/23235 10.3319/TAO.2010.10.13.01(Oc) TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES WOS:000291140000009 Gravity-geologic method Density contrast Downward continuation Article 2011 ftnctuniv https://doi.org/10.3319/TAO.2010.10.13.01(Oc 2015-08-14T06:39:25Z The downward continuation (DWC) method was used to determine the density contrast between the seawater and the ocean bottom topographic mass to estimate accurate bathymetry using the gravity-geologic method (GGM) in two study areas, which are located south of Greenland (Test Area #1: 40 - 50 degrees W and 50 - 60 degrees N) and south of Alaska (Test Area #2: 140 - 150 degrees W and 45 - 55 degrees N). The data used in this study include altimetry-derived gravity anomalies, shipborne depths and gravity anomalies. Density contrasts of 1.47 and 1.30 g cm(-1) were estimated by DWC for the two test areas. The considerations of predicted density contrasts can enhance the accuracy of 3 similar to 4 m for GGM. The GGM model provided results closer to the NGDC (National Geophysical Data Center) model than the ETOPO1 (Earth topographical database I) model. The differences along the shipborne tracks between the GGM and NGDC models for Test Areas #1 and #2 were 35.8 and 50.4 m in standard deviation, respectively. Furthermore, these differences were more strongly correlated with gravity anomalies than bathymetry in the test areas. It is shown that an accuracy of under 40 m can be obtained with comparisons to shipborne depths only in Test Area #1. Article in Journal/Newspaper Greenland Alaska National Chiao Tung University: NCTU Institutional Repository Greenland |
institution |
Open Polar |
collection |
National Chiao Tung University: NCTU Institutional Repository |
op_collection_id |
ftnctuniv |
language |
English |
topic |
Gravity-geologic method Density contrast Downward continuation |
spellingShingle |
Gravity-geologic method Density contrast Downward continuation Hsiao, Yu-Shen Kim, Jeong Woo Kim, Kwang Bae Lee, Bang Yong Hwang, Cheinway Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
topic_facet |
Gravity-geologic method Density contrast Downward continuation |
description |
The downward continuation (DWC) method was used to determine the density contrast between the seawater and the ocean bottom topographic mass to estimate accurate bathymetry using the gravity-geologic method (GGM) in two study areas, which are located south of Greenland (Test Area #1: 40 - 50 degrees W and 50 - 60 degrees N) and south of Alaska (Test Area #2: 140 - 150 degrees W and 45 - 55 degrees N). The data used in this study include altimetry-derived gravity anomalies, shipborne depths and gravity anomalies. Density contrasts of 1.47 and 1.30 g cm(-1) were estimated by DWC for the two test areas. The considerations of predicted density contrasts can enhance the accuracy of 3 similar to 4 m for GGM. The GGM model provided results closer to the NGDC (National Geophysical Data Center) model than the ETOPO1 (Earth topographical database I) model. The differences along the shipborne tracks between the GGM and NGDC models for Test Areas #1 and #2 were 35.8 and 50.4 m in standard deviation, respectively. Furthermore, these differences were more strongly correlated with gravity anomalies than bathymetry in the test areas. It is shown that an accuracy of under 40 m can be obtained with comparisons to shipborne depths only in Test Area #1. |
author2 |
土木工程學系 Department of Civil Engineering |
format |
Article in Journal/Newspaper |
author |
Hsiao, Yu-Shen Kim, Jeong Woo Kim, Kwang Bae Lee, Bang Yong Hwang, Cheinway |
author_facet |
Hsiao, Yu-Shen Kim, Jeong Woo Kim, Kwang Bae Lee, Bang Yong Hwang, Cheinway |
author_sort |
Hsiao, Yu-Shen |
title |
Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
title_short |
Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
title_full |
Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
title_fullStr |
Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
title_full_unstemmed |
Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method |
title_sort |
bathymetry estimation using the gravity-geologic method: an investigation of density contrast predicted by the downward continuation method |
publishDate |
2011 |
url |
http://hdl.handle.net/11536/23235 https://doi.org/10.3319/TAO.2010.10.13.01(Oc |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Alaska |
genre_facet |
Greenland Alaska |
op_relation |
1017-0839 http://dx.doi.org/10.3319/TAO.2010.10.13.01(Oc) http://hdl.handle.net/11536/23235 10.3319/TAO.2010.10.13.01(Oc) TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES WOS:000291140000009 |
op_doi |
https://doi.org/10.3319/TAO.2010.10.13.01(Oc |
_version_ |
1766019311762145280 |