TY - JOUR
T1 - Improved Arctic Ocean Bathymetry Derived From DTU17 Gravity Model
AU - Abulaitijiang, Adili
AU - Andersen, Ole Baltazar
AU - Sandwell, David
N1 - This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
PY - 2019
Y1 - 2019
N2 - The existing bathymetry map of the Arctic is a compilation of ship soundings and digitized contours. Due to the presence of all-year sea ice, costly operations and political restrictions, dense and full coverage of the Arctic is not possible, leaving huge gaps between the existing surveys. In this paper, we make use of the existing Arctic bathymetry IBCAOv3 and invert Arctic bathymetry from the recent altimetric gravity model DTU17, whose accuracy is improved significantly with revised data processing strategy. The long and short wavelength components are preserved from IBCAOv3. The band-pass-filtering function proposed by Smith and Sandwell (1994, https://doi.org/10.1029/94JB00988) is adapted for the Arctic by reducing the cutoff wavelength. The predicted bathymetry is within 100 m on 85.8% of the grid nodes, when compared to the IBCAOv3. The consistency of the prediction is validated with two independent profiles from Healy cruises conducted in 2016 over the Chukchi Cap. A questionable valley in the IBCAOv3 is detected with gravity and at this spot, bathymetry predicted from gravity is consistent with independent multibeam soundings. The gravity-inverted bathymetry could be combined with ship soundings for the next generation of Arctic bathymetry map.
AB - The existing bathymetry map of the Arctic is a compilation of ship soundings and digitized contours. Due to the presence of all-year sea ice, costly operations and political restrictions, dense and full coverage of the Arctic is not possible, leaving huge gaps between the existing surveys. In this paper, we make use of the existing Arctic bathymetry IBCAOv3 and invert Arctic bathymetry from the recent altimetric gravity model DTU17, whose accuracy is improved significantly with revised data processing strategy. The long and short wavelength components are preserved from IBCAOv3. The band-pass-filtering function proposed by Smith and Sandwell (1994, https://doi.org/10.1029/94JB00988) is adapted for the Arctic by reducing the cutoff wavelength. The predicted bathymetry is within 100 m on 85.8% of the grid nodes, when compared to the IBCAOv3. The consistency of the prediction is validated with two independent profiles from Healy cruises conducted in 2016 over the Chukchi Cap. A questionable valley in the IBCAOv3 is detected with gravity and at this spot, bathymetry predicted from gravity is consistent with independent multibeam soundings. The gravity-inverted bathymetry could be combined with ship soundings for the next generation of Arctic bathymetry map.
U2 - 10.1029/2018EA000502
DO - 10.1029/2018EA000502
M3 - Journal article
SN - 2333-5084
VL - 6
SP - 1336
EP - 1347
JO - Earth and Space Science
JF - Earth and Space Science
IS - 8
ER -