Summary and Outlook
- Significant increase of NOAA trackline data holdings since 2010
- New global anomaly grid at 2-arcmin resolution - includes new data and more recent satellite-based model; provides regional uncertainties
- Ongoing development of new, higher resolution (n>720) crustal field models
- New satellite-based, climatological, ionospheric field model provides daily variation at mid- and low-latitudes
- Combining real-time magnetospheric & climatological ionospheric field models reduces random error by ~50% at mid- and low-latitudes
NOAA/NCEI GEOphysical Data System (GEODAS)
- Marine and airborne trackline data:
- > 100 institutions
- > 50 years
- 3255 surveys (657 added)
- 75.9 M data points (50.6M added)
- 10.5 M miles (2.5 M added)
- Precompiled grids over continental areas
- Large-scale (>300 km) anomalies provided by satellite-based field model
EMAG2v3
- Different and fully independent algorithm
- Use no a -priori information (e.g. on ocean age of magnetization)
- More trackline data (>50M new data in GEODAS since 2010)
- New Alaska continental grid
- Each grid cell fully traceable to the data
- doi:10.7289/V5H70CVX
Global Map of Uncertainties
- Reflects heterogeneity in survey data quality
- 1𝜎 error
NCEI790
- Spherical harmonic model (n=790) inverted from EMAG2v3
- Linear algorithm fully tested with synthetic data
...
View the entire Presentation:
Recent Advances in Crustal and Disturbance Field Modeling
Arnaud Chulliat