Title of article :
Science behind global sea level and sea level rise for global warming and polar ice-melt: myths and reality
Author/Authors :
Alam Khan, Aftab Oceanography and Hydrography - BSMR Maritime University, Dhaka, Bangladesh
Abstract :
Global sea level rise of 1.5 meter by 2100 AD due to global warming and
polar ice-melt has emerged as a concept and not a science. Ocean thermal
expansion responsible for sea level rise has also emerged as a myth. Warming
of ocean surface can produce water vapor by evaporation which is not the
volumetric expansion of ocean water to raise sea level. More the thermal
heating of the ocean surface water more will be the evaporation from the
ocean that negates volumetric expansion of the ocean water. Global warming
can alleviate ocean temperature not to expand ocean water. Global scale ocean
temperature measures 28oC upto the depth of 40 m only. Below this depth
temperature drastically decreases almost to 6oC at 1000 m depth trending
further decrease. Science behind melting of the polar floating ice-blocks
supports reoccupation of the same occupied volume of the floating ice without
sea level rise. Ice-melting further reduces load from the crust of the Earth to
elastically rebound for attaining isostatic equilibrium preventing sea level rise.
Paleo-sea level markers in the sediment deposits occur due to the crustal
subsidence and uplift for transgression and regression respectively. Prograding
delta can result in apparent sea-level drop showing retreat of the sea.
Geophysical spheroidal shape of the earth with equatorial bulge and polar
flattening maintain a perfect hydrostatic equilibrium condition. Maximum
centrifugal force and minimum gravity attraction can allow sea level to occur
at about 21 km higher in the equatorial region than in the polar region
preventing sea-level fluctuation.
Keywords :
Sea level rise , Global warming; Thermal expansion , Ice-melt , Centrifugal force
Journal title :
International Journal of Coastal and Offshore Engineering