Climate Change Flashcards
What are the three pillars of modern Geodesy/ requirement of consistent reference system?
- Geometry and Kinematics
- Rotation and Orientation
- Gravity Field
What does Geometry and Kinematics include?
- Point Positions
- Deformations
- Sea Surface
What does Rotation and Orientation Include?
- Angular Velocity
- Orientation of Rotation Axis
What does Gravity Field Include?
- Static
- Time Variable
What are some important atmospheric variables?
Surface Pressure and Surface Precipitation
What are some important Oceanic Variables?
Surface Sea Level, Surface Current, Sub-Surface Current
What are some important Terrestrial Variables?
River Discharge, water use, groundwater, lakes, glaciers and ice caps, ice sheets, terrestrial water storage, moisture
What are properties of terrestrial data bases? 3
- Hetrogeneous data distribution
- Hetrogeneous accuracy
- Contain high-frequency signals
What are properties of Altimetric graivity databases 3
- Alternative method to derive gravity from mean sea surface with MDT corrections
- Covers oceans
- Contains high frequency signals
What are key observables for SST in high-low mode?
GPS orbit
What are key observables in SST low-low?
- Inter-satellite ranging
- GPS orbits
What are key observables in Satellite Gravity Gradiometry?
- Gravity gradients
- GPS orbits
How is gravity measured using satellites?
- Satellite orbits
- satellite orbit differences
- acceleration differences
What are properties of SST high-low?
- physical quantity (gravity) derived from geometric quantity (orbit perturbation)
- not direct functional of gravity potential
- highly non-linear
What measurement principle does GRACE use?
SST low-low
