"Alastair" wrote in message
...

That's strange because there has been no sudden change of trend in the
Arctic sea ice extent or the Antarctic sea ice extent

Why strange? Arctic SIE is at near record low and loss is accelerating over
the past few days, ditto Antarctic SIE, also low for day in year and
accumulation slowing. Hence the flattish top to the global SIE data and the
marked drop over the past few days. (Based on NDISC SIE data - other data
should be broadly similar other than slightly different algorithms,
running-average periods etc)

All that's happening is that daily Arctic loss is now more than accounting
for Antarctic accumulation. Isn't this what you'd expect, though without
providing any guarantees about the endpoints in mid-September of course?

On 16/07/2017 15:02, JohnD wrote:
"Alastair" wrote in message
...

That's strange because there has been no sudden change of trend in the
Arctic sea ice extent or the Antarctic sea ice extent

Why strange? Arctic SIE is at near record low and loss is accelerating
over the past few days, ditto Antarctic SIE, also low for day in year
and accumulation slowing. Hence the flattish top to the global SIE data
and the marked drop over the past few days. (Based on NDISC SIE data -
other data should be broadly similar other than slightly different
algorithms, running-average periods etc)

All that's happening is that daily Arctic loss is now more than
accounting for Antarctic accumulation. Isn't this what you'd expect,
though without providing any guarantees about the endpoints in
mid-September of course?



Large characterisation difference between these 2 representations
area

https://sites.google.com/site/arctis...a_byyear_b.png

extent
https://sites.google.com/site/arctis...t_byyear_b.png

I don't know what it means in terms of proportionality, as to the amount
of leads in the ice, falsely interpreted melt-ponds as sea, or whatever

"N_Cook" wrote in message news
I don't know what it means in terms of proportionality, as to the amount of
leads in the ice, falsely interpreted melt-ponds as sea, or whatever

I'm really no expert at all, but isn't SIA always considered to be much less
reliable a metric than SIE, because of the obvious difficulties in making
the SIA assessments. And presumably this is going to be one of the extra
tricky times of year, ie when there's a lot of potentially rotten ice
around.

On 16/07/2017 15:02, JohnD wrote:
"Alastair" wrote in message
...

That's strange because there has been no sudden change of trend in the
Arctic sea ice extent or the Antarctic sea ice extent

Why strange? Arctic SIE is at near record low and loss is accelerating
over the past few days, ditto Antarctic SIE, also low for day in year
and accumulation slowing. Hence the flattish top to the global SIE data
and the marked drop over the past few days. (Based on NDISC SIE data -
other data should be broadly similar other than slightly different
algorithms, running-average periods etc)

All that's happening is that daily Arctic loss is now more than
accounting for Antarctic accumulation. Isn't this what you'd expect,
though without providing any guarantees about the endpoints in
mid-September of course?


yes, the on-this-day global sea-ice extent measure has dropped 35,000 sq
km per day over the last 4 days.
6 times the area of the A68 iceberg, every day.
Could the global extent/area disparity mean a more "porous"
general structure and more likelihood of rapid depletion? or is it just
a normal mismatch process, repeated every year?

On 16/07/2017 17:02, N_Cook wrote:
On 16/07/2017 15:02, JohnD wrote:
"Alastair" wrote in message
...

That's strange because there has been no sudden change of trend in the
Arctic sea ice extent or the Antarctic sea ice extent

Why strange? Arctic SIE is at near record low and loss is accelerating
over the past few days, ditto Antarctic SIE, also low for day in year
and accumulation slowing. Hence the flattish top to the global SIE data
and the marked drop over the past few days. (Based on NDISC SIE data -
other data should be broadly similar other than slightly different
algorithms, running-average periods etc)

All that's happening is that daily Arctic loss is now more than
accounting for Antarctic accumulation. Isn't this what you'd expect,
though without providing any guarantees about the endpoints in
mid-September of course?


yes, the on-this-day global sea-ice extent measure has dropped 35,000 sq
km per day over the last 4 days.
6 times the area of the A68 iceberg, every day.
Could the global extent/area disparity mean a more "porous"
general structure and more likelihood of rapid depletion? or is it just
a normal mismatch process, repeated every year?

Dies Anno metric dropped 70,000 sq km in the last day to 16 July, fairly
haring away negative, ie deficit.

On 17/07/2017 17:35, N_Cook wrote:
Dies Anno metric dropped 70,000 sq km in the last day to 16 July, fairly
haring away negative, ie deficit.

That measure dropped another 20,000 to -2.529 sq km, for yesterday
The straight global sea-ice measure is going positive again.

Anyone else not able to activate the Antarctic bit of

nsidc.org/arcticseaicenews/charctic-interactive-sea-ice-graph/

All the time they had some statement about not using https , it was fine
for me. Now they've removed that statement , no antarctic via http or https

On Tuesday, 25 July 2017 17:15:55 UTC+1, N_Cook wrote:
Anyone else not able to activate the Antarctic bit of

nsidc.org/arcticseaicenews/charctic-interactive-sea-ice-graph/

All the time they had some statement about not using https , it was fine
for me. Now they've removed that statement , no antarctic via http or https

Your link works fine for me. Try this link http://nsidc.org/arcticseaicenews/

Precipitous fall in NSIDC global sea-ice extent measures recently.
Last 2 days of data to 02 Aug 2017, fell from -2.073 x10^6 sq km to
-2.157 for the day of the year anomaly deficit.
made a gallant attempt to go positive last month but I asume it has
passed peak for the year now.

On Thursday, 3 August 2017 15:22:40 UTC+1, N_Cook wrote:
Precipitous fall in NSIDC global sea-ice extent measures recently.
Last 2 days of data to 02 Aug 2017, fell from -2.073 x10^6 sq km to
-2.157 for the day of the year anomaly deficit.
made a gallant attempt to go positive last month but I asume it has
passed peak for the year now.

I doubt that was its peak, which usually happens in September or late August at the earliest.
BTW, the Arctic sea ice is tracking 2012 which hit the lowest minimum, but is not at a record low for the time of year.
https://ads.nipr.ac.jp/vishop/#/extent