I thought I would be clever and add a new answer to Hudson Bay Has Low Gravity? by using Wolfram Alpha to report gravitational acceleration for different locations, but it looks like my cleverness backfired.
I chose three points, the lowest, purple area near the West shore of the Hudson bay, a medium green-orange in lake Michigan near Chicago, and a high area just north of Iceland.
I was surprised to see Wolfram report such a high gravitational acceleration for the Hudson Bay area at 9.85 m/s2! I was expecting something substantially lower than 9.81 m/s2.
- Why is the gravitational acceleration for the west coast of the Hudson Bay so high from Wolfram Alpha?
- Roughly what acceleration should I be getting there?
- Could it be related to Wolfram Alpha's use of
EMG2008 12th orderfor a model?
- Why would it be reporting such large deviations in altitude for locations on water?
Here is the data:
lat lon Total vert dev down west south elev Western Hudson Bay 'low' 60.9N 94.1W 9.85176 0.00302 9.85172 0.00967 0.02816 -22 Lake Mich. (~Chicago) 'med' 41.7N 87.3W 9.8188 0.00352 9.81874 0.01119 0.03274 +175 North of Iceland 'high' 66.6N 18.8W 9.86107 0.00259 9.86104 0.00845 0.02406 -445
Wolfram Alpha links and raw data screen captures:
- 60.9N 94.1W, West Hudson Bay (low)
- 41.7N 87.3W, Lake Mich. (~Chicago) (med)
- 66.6N 18.8W, North of Iceland (high)