Ice melt on Greenland is consistently breaking records:
https://nsidc.org/greenland-today/
The melt doesn't re-freeze, it drains through the ice to the bottom and flows out to sea, contributing to sea level rise and Gulf Stream slowdown. The ice sheet is very unlikely to be replenished by snowfall.
"So the melt water contributes to rising sea level in two ways: (1) water from the ice surface finds its way to the ocean, contributing directly to sea level rise, and (2) the water's ability to speed flowing glacial ice towards the ocean alsocontributes to sea level rise. If all the ice that is on Greenland were to melt or calve into the ocean, global sea level would rise 7.2 meters (23.6 feet). Melting Greenland ice increases global sea level by at least 0.5 millimeters each year, though
https://scied.ucar.edu/learning-zone/climate-change-impacts/greenlands-ice-melting
When Antarctica goes, the sea level rise will be 10X.
Ice melt on Greenland is consistently breaking records:
https://nsidc.org/greenland-today/
The melt doesn't re-freeze, it drains through the ice to the bottom and flows out to sea, contributing to sea level rise and Gulf Stream slowdown. The ice sheet is very unlikely to be replenished by snowfall.
"So the melt water contributes to rising sea level in two ways:
(1) water from the ice surface finds its way to the ocean, contributing directly to sea level rise, and
(2) the water's ability to speed flowing glacial ice towards the ocean also contributes to sea level rise.
If all the ice that is on Greenland were to melt or calve into the ocean, global sea level would rise 7.2 meters (23.6 feet).
Melting Greenland ice increases global sea level by at least 0.5 millimeters each year, though recent studies suggest this rate may be increasing.
Scientists anticipate that even if greenhouse gas emissions could be cut to zero in the 2020s,
Greenland’s melting ice would still contribute to at least 0.27 meters (0.90 feet) of sea level rise over the next century."
https://scied.ucar.edu/learning-zone/climate-change-impacts/greenlands-ice-melting
When Antarctica goes, the sea level rise will be 10X.
On Sat, 30 Sep 2023 08:40:13 -0700 (PDT), Fred Bloggs <bloggs.fred...@gmail.com> wrote:
Ice melt on Greenland is consistently breaking records:
https://nsidc.org/greenland-today/
The melt doesn't re-freeze, it drains through the ice to the bottom and flows out to sea, contributing to sea level rise and Gulf Stream slowdown. The ice sheet is very unlikely to be replenished by snowfall.
"So the melt water contributes to rising sea level in two ways:100 years x 0.5 mm/a = 50 mm (0.05 m). Where did they get that 270 mm
(1) water from the ice surface finds its way to the ocean, contributing directly to sea level rise, and
(2) the water's ability to speed flowing glacial ice towards the ocean also contributes to sea level rise.
If all the ice that is on Greenland were to melt or calve into the ocean, global sea level would rise 7.2 meters (23.6 feet).
Melting Greenland ice increases global sea level by at least 0.5 millimeters each year, though recent studies suggest this rate may be increasing.
Scientists anticipate that even if greenhouse gas emissions could be cut to zero in the 2020s,
Greenland’s melting ice would still contribute to at least 0.27 meters (0.90 feet) of sea level rise over the next century."
for a century ?
To get 7.2 m sea level rise will take 14 400 year at 0.05 mm/a or 2666
years at 0.27 m/century.
It should be noted hat on both Greenland and Antarctica, the ground
level is about 1 km below sea level, so the melting of the ice that is currently under the sea level does not increase the sea level. Only
after 10 000-100 000 years will the bottom rise is emptying the water
into the oceans.
https://scied.ucar.edu/learning-zone/climate-change-impacts/greenlands-ice-melting
When Antarctica goes, the sea level rise will be 10X.
On Sunday, October 1, 2023 at 1:40:20 AM UTC+10, Fred Bloggs wrote:geological history is anything to go by
Ice melt on Greenland is consistently breaking records:
https://nsidc.org/greenland-today/
The melt doesn't re-freeze, it drains through the ice to the bottom and flows out to sea, contributing to sea level rise and Gulf Stream slowdown. The ice sheet is very unlikely to be replenished by snowfall.It certainly is being replenished by snowfall, but nowhere near enough to make up for the melting. The GRACE sattelite data shows that it is losing about 280 gigatons of ice per year
https://grace.jpl.nasa.gov/resources/30/greenland-ice-loss-2002-2021/
That is only about 0.8mm of sea level rise per year, which isn't worth worrying about. What is says about the mechanical stability if the ice sheet is more worrying - once it starts sliding off into the sea it's likely to slide quite fast, if
contributes to sea level rise. If all the ice that is on Greenland were to melt or calve into the ocean, global sea level would rise 7.2 meters (23.6 feet). Melting Greenland ice increases global sea level by at least 0.5 millimeters each year, though"So the melt water contributes to rising sea level in two ways: (1) water from the ice surface finds its way to the ocean, contributing directly to sea level rise, and (2) the water's ability to speed flowing glacial ice towards the ocean also
https://scied.ucar.edu/learning-zone/climate-change-impacts/greenlands-ice-meltinghttps://edition.cnn.com/2023/07/20/world/greenland-ice-sheet-melt-sea-level-rise-climate/index.html
says much the same, about Greenland.
When Antarctica goes, the sea level rise will be 10X.If the whole of the Antarctic ice sheet slid off it would raise sea levels by 65 metres, but that is remarkably unlikely.
The West Antarctic ice sheet is much more vulnerable than the rest, but that is only about 4 metres of sea level rise.
--
Bill Sloman, Sydney
On Saturday, September 30, 2023 at 12:54:48 PM UTC-4, Anthony William Sloman wrote:geological history is anything to go by
On Sunday, October 1, 2023 at 1:40:20 AM UTC+10, Fred Bloggs wrote:
Ice melt on Greenland is consistently breaking records:
https://nsidc.org/greenland-today/
The melt doesn't re-freeze, it drains through the ice to the bottom and flows out to sea, contributing to sea level rise and Gulf Stream slowdown. The ice sheet is very unlikely to be replenished by snowfall.It certainly is being replenished by snowfall, but nowhere near enough to make up for the melting. The GRACE sattelite data shows that it is losing about 280 gigatons of ice per year
https://grace.jpl.nasa.gov/resources/30/greenland-ice-loss-2002-2021/
That is only about 0.8mm of sea level rise per year, which isn't worth worrying about. What is says about the mechanical stability if the ice sheet is more worrying - once it starts sliding off into the sea it's likely to slide quite fast, if
contributes to sea level rise. If all the ice that is on Greenland were to melt or calve into the ocean, global sea level would rise 7.2 meters (23.6 feet). Melting Greenland ice increases global sea level by at least 0.5 millimeters each year, though"So the melt water contributes to rising sea level in two ways: (1) water from the ice surface finds its way to the ocean, contributing directly to sea level rise, and (2) the water's ability to speed flowing glacial ice towards the ocean also
https://scied.ucar.edu/learning-zone/climate-change-impacts/greenlands-ice-meltinghttps://edition.cnn.com/2023/07/20/world/greenland-ice-sheet-melt-sea-level-rise-climate/index.html
says much the same, about Greenland.
When Antarctica goes, the sea level rise will be 10X.
If the whole of the Antarctic ice sheet slid off it would raise sea levels by 65 metres, but that is remarkably unlikely.
Antarctica has designs on becoming a tropical rain forest again. And Greenland wants to become green again.
https://www.smithsonianmag.com/smart-news/melting-greenland-ice-sheet-will-cause-at-least-ten-inches-of-sea-level-rise-study-finds-180980675/
The West Antarctic ice sheet is much more vulnerable than the rest, but that is only about 4 metres of sea level rise.
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