Article Evaluation/ Brainstorming for GRACE editing: bolded sections are proposed edits
According to aerospace.org [1], GRACE-1 reentry will not be until after February 2018.
"...atmospheric reentry of GRACE-1 is predicted to occur in late February 2018." >> "...atmospheric reentry of GRACE-1 is predicted to occur on March 10, 2018." [2]
220km instead of "approximately 200km" in introduction?
"During normal operations, the satellites were separated by approximately 200 km along their orbit track." >> "During normal operations, the satellites were separated by 220 km along their orbit track. This system was able to gather global coverage every 30 days." [3]
How do they estimate ocean bottom pressure and what do they use it for? (Oceanography, hydrology, and ice sheets section)
"Scientists use GRACE data to estimate ocean bottom pressure—as important to oceanographers as atmospheric pressure is to meteorologists." >> "Scientists use GRACE data to estimate ocean bottom pressure (the combined weight of the ocean waters and atmosphere), which is as important to oceanographers as atmospheric pressure is to meteorologists [use same citation]. For example, measuring ocean pressure gradients allows scientists to estimate monthly changes in deep ocean currents.[4] The limited resolution of GRACE is acceptable in this research because the ocean currents are so large, and because deep ocean current estimates can be verified by an ocean buoy network. [5] Scientists have also detailed improved methods for using GRACE data to describe Earth's gravity field (Watkins, et al, 2015).[6]"
How do they separate the effects of currents versus variations in Earth's gravity field on ocean surface topography?
"The hills and valleys in the ocean's surface (ocean surface topography) are due to ocean currents and variations in Earth's gravity field.GRACE enables separation of those two effects to better measure ocean currents and their effect on climate." >> ELABORATE?
Add in an estimate of how much land we are losing due to 0.9 mm/yr of sea level rise -- might be too much of a tangent?
(Working with Bamsberry and Wike4167...)
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Resources
edit- ^ "Upcoming and Recent Reentries | The Aerospace Corporation". www.aerospace.org. Retrieved 2018-02-27.
- ^ "SATVIEW - Tracking Satellites".
- ^ "GRACE: Gravity Anomaly Maps and The Geoid". earthobservatory.nasa.gov.
- ^ "Measuring Gravity With GRACE".
- ^ Rasmussen, Carol (November 1, 2015). "NASA Finds New Way to Track Ocean Currents from Space". grace.jpl.nasa.gov.
- ^ Watkins, Michael M. (April 7, 2015). "Improved methods for observing Earth's time variable mass distribution with GRACE using spherical cap mascons". Journal of Geophysical Research. 120 (4): 2648–2671. doi:10.1002/2014JB011547. S2CID 129824063.