The video shows the disintegration of Pine Island Glacier
The bottom of the ocean is sinking, warping and deforming due to the weight of the water added by melting glaciers. What does this say about the estimated extent of sea level rise?
( Pixabay )
Glaciers melted for a long time have been linked to rising sea levels, but melting ice has also added so much water to the global ocean that the seafloor now sinks below the increasing weight.
Ocean floor sinking, deforming and deforming  The huge mass that is added to the ocean also causes the sea floor to warp and deform, which can hide the real rise in sea level in some parts of our planet and even cover the actual magnitude of sea level rise.
new study published in Geophysical Research Levels study researcher Thomas Frederikse, from the Technological University of Delft in the Netherlands, and his colleagues used a mathematical equation called elastic equation of sea level to obtain A more accurate measurement of the ocean floor.
Their calculations allowed researchers to see to what extent the bottom of the ocean floor has changed in the last two decades. The study is the first to consider how the additional water from melting ice has spread to the ocean floor.
"We have had measurements of sea level rise for more than a century," Frederikse said. "You put an instrument on the bottom of the sea and you see how far the sea level changes with respect to the bottom, the satellites that orbit the Earth measure the sea level from space, we wanted to see how big the difference is"
Scope of sea level. It can be underestimated
The calculations revealed that between 1993 and 2014, the increase in the total oceanic load caused the bottom of the sea to sink by approximately 2.5 mm, or approximately 0.13 mm per year. The fall of the ocean floor in some regions, however, is significantly higher with up to 1 mm per year in the Arctic Ocean and 0.4 mm in the South Pacific.
The findings could mean that satellite assessments of changes in sea levels, which do not take into account the sinking ocean floor, may be underestimating the extent to which the seas are rising. The sea level rise in barracity, the actual rising volume of the ocean, in particular, is masked from measurements based on satellite observations.
"During 1993-2014, the resulting globally averaged geocentric sea level change is 8% smaller than the bistatic contribution," the researchers wrote in their study. "On the altimetric domain, the difference is approximately 5%, and due to this effect, the sea level rise in the barrage will be underestimated by more than 0.1 mm / year during 1993-2014".
The researchers said that the accuracy of future estimates of sea levels can be improved by taking into account the sinking of the ocean floor.
© 2018 Tech Times, All rights reserved. Not to be reproduced without permission.