One can also add ice into the mix:
global ice mass loss has accelerated in the last decade, despite what appears to be a surface temp flattening.
Not exact matches
It's a research approach new to glaciology that could lead to more accurate predictions for
ice -
mass loss and
global sea - level rise.
The melting of Greenland contributes to the
global sea level, but the
loss of
mass also means that the
ice sheet's own gravitational field weakens and thus does not attract the surrounding sea as strongly.
The results highlight how the interaction between ocean conditions and the bedrock beneath a glacier can influence the frozen
mass, helping scientists better predict future Antarctica
ice loss and
global sea level rise.
Joughin et al. (2010) applied a numerical
ice sheet model to predicting the future of PIG, their model suggested ongoing
loss of
ice mass from PIG, with a maximum rate of
global sea level rise of 2.7 cm per century.
and therefore to be able to make a stronger statement on how unique the current and apparently
global warming related
ice mass loss is» for Greenland, he says.
Our modelled values are consistent with current rates of Antarctic
ice loss and sea - level rise, and imply that accelerated
mass loss from marine - based portions of Antarctic
ice sheets may ensue when an increase in
global mean air temperature of only 1.4 - 2.0 deg.
The total 2000 — 2008
mass loss of ~ 1500 gigatons, equivalent to 0.46 millimeters per year of
global sea level rise, is equally split between surface processes (runoff and precipitation) and
ice dynamics.
This is despite using observed
ice sheet
mass loss (0.19 mm / year) in the «modelled» number in this comparison, otherwise the discrepancy would be even larger — the
ice sheet models predict that the
ice sheets gain
mass due to
global warming.
The contribution from glaciers and
ice caps (not including Greenland and Antarctica), on the other hand, is computed from a simple empirical formula linking
global mean temperature to
mass loss (equivalent to a rate of sea level rise), based on observed data from 1963 to 2003.
Given the level of denialism in the face of glacial
mass loss, plummeting Arctic summer
ice cover, progressive collapse of
ice shelves that have been stable for 6000 to 10000 years, northward, upward, and seasonally earlier movements of ecosystems and other phenological changes, increasing Greenland
ice melt, and all the other direct observations of
global warming, I think denialists will go to their graves believing it can't be happening.
A rise in
global mean sea level of between 0.09 and 0.88 metres by 2100 has been projected, mainly due to the thermal expansion of sea water and
loss of
mass from
ice caps and glaciers».
Between April 2002 and April 2006, GRACE data uncovered
ice mass loss in Greenland of 248 ± 36 cubic kilometers per year, an amount equivalent to a
global sea rise of 0.5 ± 0.1 millimeters per year.
If both Greenland and West Antarctica shed the entirety of their
ice burden,
global sea levels would rise by 12 to 14 m. Although these icecaps would not disintegrate within a century, the
loss of even a third of their
mass — quite plausible if the rate of polar
ice loss continues to double each decade — would force up the oceans by at least 4 m, with disastrous socioeconomic and environmental consequences.
«It is very likely that the rate of
global mean sea level rise during the 21st century will exceed the rate observed during 1971 — 2010 for all Representative Concentration Pathway (RCP) scenarios due to increases in ocean warming and
loss of
mass from glaciers and
ice sheets.
However, despite this, the team reckon to have perhaps isolated a «
global warming» signal in the accelerated run off of the Greenland
Ice Mass — but only just, because the runoff at the edges is balanced by increasing central mass — again, they focus upon recent trends — a net loss of about 22 cubic kilometres in total ice mass per year which they regard as statistically not significant — to find the «signal», and a contradiction to their ealier context of air temperature cycl
Ice Mass — but only just, because the runoff at the edges is balanced by increasing central
mass — again, they focus upon recent trends — a net
loss of about 22 cubic kilometres in total
ice mass per year which they regard as statistically not significant — to find the «signal», and a contradiction to their ealier context of air temperature cycl
ice mass per year which they regard as statistically not significant — to find the «signal», and a contradiction to their ealier context of air temperature cycles.
We use realistic estimates of
mass redistribution from
ice mass loss and land water storage to quantify the resulting ocean bottom deformation and its effect on
global and regional ocean volume change estimates.
Evidence is also strong that Alaska
ice mass loss contributes to
global sea level rise, 65 with latest results permitting quantitative evaluation of
losses globally.66
Ice, Cloud and land Elevation Satellite (ICESat) data (2003 — 08) show
mass gains from snow accumulation exceeded discharge
losses by 82 ± 25 Gt a − 1, reducing
global sea - level rise by 0.23 mm a − 1.
Fluctuations in the
mass of the Greenland and Antarctic
ice sheets are of considerable societal importance as they impact directly on
global sea levels: since 1901,
ice losses from Antarctica and Greenland, alongside the melting of small glaciers and
ice caps and thermal expansion of the oceans, have caused
global sea levels to rise at an average rate of 1.7 mm / yr.
Mean sea level (MSL) evolution has a direct impact on coastal areas and is a crucial index of climate change since it reflects both the amount of heat added in the ocean and the
mass loss due to land
ice melt (e.g. IPCC, 2013; Dieng et al., 2017) Long - term and inter-annual variations of the sea level are observed at
global and regional scales.
Current total
ice -
loss in Greenland is running at an estimated 200 Gte / yr and Antarctica at 150 Gte / yr (with
ice mass gain in the east and
loss in the west — with some estimates of a net gain)-- at that rate of 1mm / yr, by 2100 the
global ice -
loss would raise sea level by a little over 3 inches.
Current models suggest
ice mass losses increase with temperature more rapidly than gains due to increased precipitation and that the surface
mass balance becomes negative (net
ice loss) at a
global average warming (relative to pre-industrial values) in excess of 1.9 to 4.6 °C.
Thirteen years of GRACE data provide an excellent picture of the current
mass changes of Greenland and Antarctica, with
mass loss in the GRACE period 2002 - 15 amounting to 265 ± 25 GT / yr for Greenland (including peripheral
ice caps), and 95 ± 50 GT / year for Antarctica, corresponding to 0.72 mm / year and 0.26 mm / year average
global sea level change.
There's no observed pause in sea - level rise; there's no observed pause in
global energy imbalance, there's no observed pause in polar
ice -
mass loss.
Ocean warming near the Antarctic
ice shelves has critical implications for future
ice sheet
mass loss and
global sea level rise.