Tag Archives: sea ice

Antarctic Ice Instability due to Geothermal Heat Flux

Helene Seroussi, Erik R. Ivins, Douglas A. Wiens, Johannes Bondzio. Influence of a West Antarctic mantle plume on ice sheet basal conditions. Journal of Geophysical Research: Solid Earth. Volume 122, Issue 9, September 2017 , Pages 7127–7155 DOI: 10.1002/2017JB014423

The possibility that a deep mantle plume manifests Pliocene and Quaternary volcanism and potential elevated heat flux in West Antarctica has been studied for more than 30 years. Recent seismic images support the plume hypothesis as the cause of Marie Byrd Land (MBL) volcanism and geophysical structure. Mantle plumes may more than double the geothermal heat flux above nominal continental values. A dearth of in situ ice sheet basal data exists that samples the heat flux. Consequently, we examine a realistic distribution of heat flux associated with a possible late Cenozoic mantle plume in West Antarctica and explore its impact on thermal and melt conditions at the ice sheet base. We use a simple analytical mantle plume parameterization to produce geothermal heat flux at the base of the ice sheet. The three-dimensional ice flow model includes an enthalpy framework and full-Stokes stress balance. As both the putative plume location and extent are uncertain, we perform broadly scoped experiments to characterize the impact of the plume on geothermal heat flux and ice sheet basal conditions. The experiments show that mantle plumes have an important local impact on the ice sheet, with basal melting rates reaching several centimeters per year directly above the hotspot. In order to be consistent with observations of basal hydrology in MBL, the upper bound on the plume-derived geothermal heat flux is 150 mW/m2. In contrast, the active lake system of the lower part of Whillans Ice Stream suggests a widespread anomalous mantle heat flux, linked to a rift source.

The Guardian Incorrect on Sea Ice Probe Elimination

The Guardian (here) has incorrectly cast blame on President Trump for eliminating a sea ice probe and obstructing satellite research. The decision was actually made in 2016 during the Obama administration. (click here)

Sea Ice and Atmospheric Carbon Dioxide Unrelated

“According to climate models, anthropogenic CO2 emissions drive trends in polar sea ice.   The sea ice extent in both the Northern and Southern Hemispheres should therefore gradually decline (linearly) as human emissions rise.

However, neither the Arctic nor Antarctic sea ice trends appear to be cooperating with these modeled expectations.” click here for notrickszone.

Greenland Ice Sheet is Growing Larger, Not Shrinking

“One thing that climate rationalists and warmers can agree on is that we all would like to have a healthy Greenland Ice Sheet. The good news on that front is that the ice sheet has put on 500 Gt this year…” click here

Arctic Sea Ice to Increase Towards 2020

“In a paper by Marius Årthun et al appearing in Nature Communication titled: Skillful prediction of northern climate provided by the ocean, researchers checked whether anomalous heat in the Gulf Stream’s northern extension provided predictability of northwestern European and Arctic climate.” click here for the NoTricksZone.

Does Global Warming Increase Hudson Bay Sea Ice, or Does it Decrease Hudson Bay Sea Ice?

Does global warming increase or decrease Hudson Bay Sea ice? I’m just wondering….. click here

Global Warming Study Cancelled because of Too Much Ice

“A global warming research study in Canada has been cancelled because of “unprecedented” thick summer ice.

Naturally, the scientist in charge has blamed it on ‘climate change.’ “ click here