Processing and inversion of SkyTEM data for high resolution hydrogeophysical surveys

2007 ◽  
Vol 2007 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Esben Auken ◽  
Joakim Westergaard ◽  
Anders V. Christiansen ◽  
Kurt Sørensen
Keyword(s):  
High Resolution ◽  
And Inversion

scholarly journals Mapping pan-Arctic methane emissions at high spatial resolution using an adjoint atmospheric transport and inversion method and process-based wetland and lake biogeochemical models

2015 ◽  
Vol 15 (22) ◽  
pp. 32469-32518 ◽  
Author(s):  
Z. Tan ◽  
Q. Zhuang ◽  
D. K. Henze ◽  
C. Frankenberg ◽  
E. Dlugokencky ◽  
...  
Keyword(s):  
High Resolution ◽  
Atmospheric Transport ◽  
Methane Emissions ◽  
The Arctic ◽  
Inversion Method ◽  
Methane Cycle ◽  
Mixing Ratios ◽  
Biogeochemical Models ◽  
Northern Russia ◽  
And Inversion

Abstract. Understanding methane emissions from the Arctic, a fast warming carbon reservoir, is important for projecting changes in the global methane cycle under future climate scenarios. Here we optimize Arctic methane emissions with a nested-grid high-resolution inverse model by assimilating both high-precision surface measurements and column-average SCIAMACHY satellite retrievals of methane mole fraction. For the first time, methane emissions from lakes are integrated into an atmospheric transport and inversion estimate, together with prior wetland emissions estimated by six different biogeochemical models. We find that, the global methane emissions during July 2004–June 2005 ranged from 496.4 to 511.5 Tg yr−1, with wetland methane emissions ranging from 130.0 to 203.3 Tg yr−1. The Arctic methane emissions during July 2004–June 2005 were in the range of 14.6–30.4 Tg yr−1, with wetland and lake emissions ranging from 8.8 to 20.4 Tg yr−1 and from 5.4 to 7.9 Tg yr−1 respectively. Canadian and Siberian lakes contributed most of the estimated lake emissions. Due to insufficient measurements in the region, Arctic methane emissions are less constrained in northern Russia than in Alaska, northern Canada and Scandinavia. Comparison of different inversions indicates that the distribution of global and Arctic methane emissions is sensitive to prior wetland emissions. Evaluation with independent datasets shows that the global and Arctic inversions improve estimates of methane mixing ratios in boundary layer and free troposphere. The high-resolution inversions provide more details about the spatial distribution of methane emissions in the Arctic.

Adaptive Multiscale Streamline Simulation and Inversion for High-Resolution Geomodels

2007 ◽  
Author(s):  
Vegard R. Stenerud ◽  
Vegard Kippe ◽  
Akhil Datta-Gupta ◽  
Knut-Andreas Lie
Keyword(s):  
High Resolution ◽  
Streamline Simulation ◽  
And Inversion

Timing, duration and inversion of prograde Barrovian metamorphism constrained by high resolution Lu–Hf garnet dating: A case study from the Sikkim Himalaya, NE India

2014 ◽  
Vol 407 ◽  
pp. 70-81 ◽  
Author(s):  
Robert Anczkiewicz ◽  
Sumit Chakraborty ◽  
Somnath Dasgupta ◽  
Dilip Mukhopadhyay ◽  
Katarzyna Kołtonik
Keyword(s):  
High Resolution ◽  
Sikkim Himalaya ◽  
Ne India ◽  
And Inversion

scholarly journals High‐resolution shallow water 3‐D survey and inversion for geophysical parameters

1993 ◽  
Vol 93 (4) ◽  
pp. 2269-2269
Author(s):  
Mrinal K. Sen ◽  
Paul L. Stoffa ◽  
James A. Austin
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
And Inversion

High-resolution surface NMR tomography of shallow aquifers based on multioffset measurements

Geophysics ◽  
2009 ◽  
Vol 74 (6) ◽  
pp. G47-G59 ◽  
Author(s):  
Marian Hertrich ◽  
Alan G. Green ◽  
Martina Braun ◽  
Ugur Yaramanci
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Resolution ◽  
Free Water ◽  
Water Concentration ◽  
Data Sets ◽  
Lateral Heterogeneity ◽  
Data Recording ◽  
Tomographic Inversion ◽  
And Inversion ◽  
Limited Surface

Conventional surface nuclear magnetic resonance (NMR) surveying based on 1D inversions of data recorded using a common (coincidence) transmitter and receiver loop provides only limited or distorted water-concentration information in regions characterized by strong lateral heterogeneity. We introduce a combined field-acquisition and tomographic-inversion strategy suitable for 2D surface NMR investigations of free (i.e., unbound) water stored in hydrogeologically complex regions. Using combinations of coincident and multioffset loops, we take advantage of the range of sensitivities offered by different loop configurations to variations in subsurface free-water concentration. The new tomographic scheme can invert data acquired with diverse loop configurations. Tests of the combined acquisition and inversion strategy on complicated synthetic and observed data demonstrate the substantially higher resolution information provided by combinations of loop configurations vis-à-vis that supplied by a standard coincident loop. A combination of coincident and half-overlapping loop data sets yields tomograms rich in detail, comparable to tomograms derived from a combination of all considered loop configurations. If resources are limited, surface NMR practitioners should consider the half-overlapping loop configuration as an alternative to the standard coincident loop configuration. For a four-station data recording campaign, the half-overlapping loop configuration with 50% more measurements and equal number of loop deployments and retrievals provides significantly higher resolution tomograms than a coincident loop configuration.

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