A new peer-reviewed scientific paper by multiple scientists from numerous research institutions in many countries summarizes the ice sheet mass balance at both poles (Greenland and Antarctica) from 1992 to 2020 using satellite data examining 3 different metrics (3 different ways), namely:
1) Ice loss versus ice gain to get net loss
2) Altimetry
3) Gravity
Using these three independent methods, the study allows for the most accurate determination of climate change induced mass loss at the poles, and the uncertainty in the measurements.
Basically, ice melt on the major ice sheets at the two poles has increased by an overall factor of six in the last 30 years. This represents a loss rate doubling period of about 11 years (a doubling period of 10 years for a time period of 30 years would give an overall factor of 2x2x2 = 8 times; we have 6 times). Of course this doubling period decreases as ice loss accelerates.
I also discuss an important new paper looking at sea level rise impacts. It argues that the impacts on coastlines will be much more severe that we previously thought, since coastline height above present sea level has been measured incorrectly up to now, using radar data. Rather than detecting the ground above sea level, this radar detection has been erroneously measuring treetop and coastal roof heights above sea level. Pretty crazy mistake for the DEMs (Digital Elevation Models).
Using the much better resolution and accurate method of LIDAR (Light Detection and Ranging) versus RADAR (Radio Detection and Ranging) the correct data has now been obtained, and it shows that 1 meter (3.3 feet) of SLR (sea level rise) will utterly swamp many low lying deltas and displace many more people than previously thought, and of course 2 meters of SLR will be even way more catastrophic to coastal regions around the planet.
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