"N_Cook" wrote in message news
Anyone know of a site outputting the state of the Grreenland ice
covering? Monitoring the gravity anomaly associated with that mass,
altimetry aggregation or whatever, outputted presumably weekly or
monthly rather than daily
====================

You could try asking on the Greenland ice forum at:

https://forum.arctic-sea-ice.net/ind...oard,12.0.html

On Saturday, 18 February 2017 11:18:33 UTC, N_Cook wrote:
On 17/02/2017 17:13, N_Cook wrote:
On 16/02/2017 15:22, N_Cook wrote:
On 15/02/2017 14:59, N_Cook wrote:
On 14/02/2017 14:48, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq km
yesterday and likely to be still dropping for a week or so.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/
new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/




some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

change of title
The Antarctic sea-ice new record extent stood at 2.259 million sq km
yesterday and daily decrement still well in the tens of 000s .
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice new record minimum extent stood at 2.248 million
sq km 15 Feb 2017.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice record minimum extent stood at 2.243 million sq km
16 Feb 2017.


Anyone know of a site outputting the state of the Grreenland ice
covering? Monitoring the gravity anomaly associated with that mass,
altimetry aggregation or whatever, outputted presumably weekly or
monthly rather than daily

Here are some Greenland sites:
http://www.ogimet.com/cgi-bin/gsynre...04416&ndays=30
http://nsidc.org/greenland-today/
http://polarportal.dk/en/groenlands-...ens-overflade/

Cheers, Alastair.

On 18/02/2017 11:46, JohnD wrote:
"N_Cook" wrote in message news Anyone know of a site outputting the state of the Grreenland ice
covering? Monitoring the gravity anomaly associated with that mass,
altimetry aggregation or whatever, outputted presumably weekly or
monthly rather than daily
====================

You could try asking on the Greenland ice forum at:

https://forum.arctic-sea-ice.net/ind...oard,12.0.html

I've had a bit of a rummage there, promising, but only imagery sites
found so far.
When I get some time i'll rummage on these sites
http://www.scp.byu.edu/

https://manati.star.nesdis.noaa.gov/...s/QuikSCAT.php

at the moment I don't see how scatterometers can be used for this, but
interesting to find out.
Sea-ice is something and nothing , its the 70 metre of world sea-level
rise locked up on Greenland more so than the glacier ice on Antarctica
that really matters , but for how long?
I suppose its only necessary to watch the outputting of satellite global
sea-level measurement, for mid-ocean trends

Anyone know of a site outputting the state of the Grreenland ice
covering? Monitoring the gravity anomaly associated with that mass,
altimetry aggregation or whatever, outputted presumably weekly or
monthly rather than daily

Here are some Greenland sites:
http://www.ogimet.com/cgi-bin/gsynre...04416&ndays=30
http://nsidc.org/greenland-today/
http://polarportal.dk/en/groenlands-...ens-overflade/

Cheers, Alastair.



that gravity monitoring site looks the bis
http://polarportal.dk/en/groenlands-...masseaendring/
I'll try and find a mid-ocean subset sea-level altimetry site as well

On 18/02/2017 12:54, N_Cook wrote:


Anyone know of a site outputting the state of the Grreenland ice
covering? Monitoring the gravity anomaly associated with that mass,
altimetry aggregation or whatever, outputted presumably weekly or
monthly rather than daily

Here are some Greenland sites:
http://www.ogimet.com/cgi-bin/gsynre...04416&ndays=30
http://nsidc.org/greenland-today/
http://polarportal.dk/en/groenlands-...ens-overflade/

Cheers, Alastair.



that gravity monitoring site looks the bis
http://polarportal.dk/en/groenlands-...masseaendring/
I'll try and find a mid-ocean subset sea-level altimetry site as well

It looks as though 2-3 month lag for free product for this sort of
stuff, eg Jason-2 global sealevel rise
http://www.aviso.altimetry.fr/en/dat...ts-images.html

On 17/02/2017 17:13, N_Cook wrote:
On 16/02/2017 15:22, N_Cook wrote:
On 15/02/2017 14:59, N_Cook wrote:
On 14/02/2017 14:48, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq km
yesterday and likely to be still dropping for a week or so.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/
new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/




some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

change of title
The Antarctic sea-ice new record extent stood at 2.259 million sq km
yesterday and daily decrement still well in the tens of 000s .
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice new record minimum extent stood at 2.248 million
sq km 15 Feb 2017.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice record minimum extent stood at 2.243 million sq km
16 Feb 2017.


change of title, by a 1000 sq km "whisker"
The (NSIDC) Antarctic sea-ice record minimum extent stood at 2.242
million sq km 19 Feb 2017.

On Tuesday, 14 February 2017 14:48:05 UTC, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq km
yesterday and likely to be still dropping for a week or so.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/
new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/
some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

It is no great surprise given that when the Austral winter was in full force, there was a dearth of much warmer water further south in the Pacific because of El Nino. This warmer mass of water was then distributed around the southern ocean easily over the summer (aiding melting at the surface/ice shelf margins) due to there being no land mass to divert it, like there would be in the northern hemisphere.

I was stationed in the South Atlantic for another couple of El Nino years and we observed that exact occurrence back then too.

The only difference to nowadays was that back then, most of the ice extent was measured by ship reports and manual readings where as now, we rely on satellites which cannot see the ice through cloud...of which there is a massive amount over the Antarctic and Arctic for a lot of the summer months.
So there is an awful lot of "interploation" that goes on to produce the current stats.
I personally do not find that particularly scientific, though the main reason for it is cost and efficiency I suppose.

Hope this is useful for someone.

On 20/02/17 16:55, Crusader wrote:
On Tuesday, 14 February 2017 14:48:05 UTC, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq
km yesterday and likely to be still dropping for a week or so. 27
Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/


new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/


some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

It is no great surprise given that when the Austral winter was in
full force, there was a dearth of much warmer water further south in
the Pacific because of El Nino. This warmer mass of water was then
distributed around the southern ocean easily over the summer (aiding
melting at the surface/ice shelf margins) due to there being no land
mass to divert it, like there would be in the northern hemisphere.

I was stationed in the South Atlantic for another couple of El Nino
years and we observed that exact occurrence back then too.

The only difference to nowadays was that back then, most of the ice
extent was measured by ship reports and manual readings where as now,
we rely on satellites which cannot see the ice through cloud...of
which there is a massive amount over the Antarctic and Arctic for a
lot of the summer months. So there is an awful lot of "interploation"
that goes on to produce the current stats. I personally do not find
that particularly scientific, though the main reason for it is cost
and efficiency I suppose.

Hope this is useful for someone.


I'm not sure what you mean when you say that cloud cover is a current
problem for satellite imagery of ice. It was certainly a problem back in
the '60s when I was producing ice charts. It was a slog ploughing
through days of satellite photos to sort out what was ice and what was
cloud. However, this was largely resolved near the end of that decade
when we started getting weekly minimum-brightness pictures from the
States. This was pretty basic technology which involved a computer doing
the job automatically for a week of pictures that I'd been doing by hand.

--
Graham P Davis, Bracknell, Berks. [Retd meteorologist/programmer]
Web-site: http://www.scarlet-jade.com/
Never approach a bull from the front, a horse from the rear,
or an idiot from any direction! [Irish proverb]

On 20/02/2017 16:55, Crusader wrote:
On Tuesday, 14 February 2017 14:48:05 UTC, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq km
yesterday and likely to be still dropping for a week or so.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/
new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/
some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

It is no great surprise given that when the Austral winter was in full force, there was a dearth of much warmer water further south in the Pacific because of El Nino. This warmer mass of water was then distributed around the southern ocean easily over the summer (aiding melting at the surface/ice shelf margins) due to there being no land mass to divert it, like there would be in the northern hemisphere.

I was stationed in the South Atlantic for another couple of El Nino years and we observed that exact occurrence back then too.

The only difference to nowadays was that back then, most of the ice extent was measured by ship reports and manual readings where as now, we rely on satellites which cannot see the ice through cloud...of which there is a massive amount over the Antarctic and Arctic for a lot of the summer months.
So there is an awful lot of "interploation" that goes on to produce the current stats.
I personally do not find that particularly scientific, though the main reason for it is cost and efficiency I suppose.

Hope this is useful for someone.

I thought clouds were the reason they used microwave for sea-ice
monitoring.

On 20/02/2017 14:48, N_Cook wrote:
On 17/02/2017 17:13, N_Cook wrote:
On 16/02/2017 15:22, N_Cook wrote:
On 15/02/2017 14:59, N_Cook wrote:
On 14/02/2017 14:48, N_Cook wrote:
The Antarctic sea-ice new record extent stood at 2.287 million sq km
yesterday and likely to be still dropping for a week or so.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm and output at
http://nsidc.org/arcticseaicenews/ch...sea-ice-graph/
new record confirmed here
https://www.scientificamerican.com/a...at-both-poles/





some background here
https://forum.arctic-sea-ice.net/ind...,1759.450.html

change of title
The Antarctic sea-ice new record extent stood at 2.259 million sq km
yesterday and daily decrement still well in the tens of 000s .
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice new record minimum extent stood at 2.248 million
sq km 15 Feb 2017.
27 Feb 1997 previous satellite era record of 2.290 million sq km using
the NSIDC algorithm


change of title
The Antarctic sea-ice record minimum extent stood at 2.243 million sq km
16 Feb 2017.


change of title, by a 1000 sq km "whisker"
The (NSIDC) Antarctic sea-ice record minimum extent stood at 2.242
million sq km 19 Feb 2017.



change of title, but as back to a large daily decrement of 13,000 sq km,
had to check for any news reports of a bit of Larsen C having gone missing.
The (NSIDC) Antarctic sea-ice record minimum extent stood at 2.229
million sq km 20 Feb 2017.
Unfortunately ,as this stuff is nordocentric, cannot find the ratio of
MYI : FYI down south, other than this passing mention, no reason to
assume any different to the north situation

http://adrian.fritztech.com/category/antarctica/page/3/
Drake Passage snapshot 2015

.... This year has just been so very odd. We have had a lot of ice, but
most of it was pancake ice (very newly formed) or surprisingly thin
first year-ice. We have seen very little multi-year ice which is what
is needed to keep the animal populations down here healthy. The past
few years almost all of the ice has melted out in the summer heat, so
it never gets a chance to build up. The summers are hotter longer, so
the ice starts forming later during the winter. It really shouldn’t be
a surprise that the first year ice is noticeably thinner this year; at
the start of winter this region recorded a record setting high
temperature of 63 F. Here is hoping that some of of this lovely newly
formed ice sticks around until next year. ...