This post is just a placeholder, so I can refer to some graphs elsewhere.
Northern hemisphere sea ice extent:
Northern hemisphere sea ice extent anomaly:
September sea ice extent:
Categories: Global Warming
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7 responses so far ↓
Ed Davies // November 30, 2008 at 10:16 pm
This comment is just a placeholder, too :-)
Actually, it’d be intriguing to know how much spread there is in the September extent over a longer period - ideally a century or more. If it’s not large then these are pretty sobering graphs.
[Response: I posted about data for earlier in the century here.]
cce // December 1, 2008 at 12:31 am
There is older satellite (extent) data here:
http://polynya.gsfc.nasa.gov/seaice_datasets.html
Arctic 1972-2006, Antarctic 1973-2006.
My attempt to stitch them to 2007 NSIDC extent:
http://cce.890m.com/changes/images/nh-extent.jpg
http://cce.890m.com/changes/images/sh-extent.jpg
http://cce.890m.com/changes/images/global-extent.jpg
Various Arctic extent graphs from AR4 (includes the HadISST dataset that tamino examined)
http://cce.890m.com/changes/images/arctic-extent-long.jpg
Ed Davies // December 1, 2008 at 8:29 pm
Thanks both.
William Connolley // December 2, 2008 at 10:58 pm
cce: *don’t do it*. You can’t stitch the esmr data onto the ssmr/ssmi. No-one can. They just aren’t compatible.
cce // December 3, 2008 at 3:03 am
William,
I didn’t stitch the ESMR data to SSMR data. Cavalieri et al did that.
http://neptune.gsfc.nasa.gov/csb/personnel/pdf/Cavalieri/2003gl018031.pdf
I stitched the NSIDC data of the last year to the GSFC data which hasn’t been updated since 2006. I used the period from 1988 to 2006 (SSMI data only) to calibrate NSIDC to GSFC.
cce // December 3, 2008 at 3:35 am
That paper is missing pages. Here is a better version:
http://www.atmos.umd.edu/~kostya/Pdf/Seaice.30yrs.GRL.pdf
geoxzi // December 5, 2008 at 8:16 pm
I watch the daily radar measured ice levels at the poles at http://www.globalboiling.org
One reasonable indicator that lay people can truly conceptualize is the minimum and maximum ice coverage throughout the year.
Visually in real time it is quite dramatic in August.
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