Happy New Year 2024 (and sorry for the forum being offline some hours) /DM
October 25, 2013: Daily updates to the graph and image are temporarily suspended due to technical difficulties with the data provider.
The last Bremen F17 image is indeed from the 22nd:http://www.iup.uni-bremen.de:8084/ssmis/archivebrowse.php?date=20131022®ion=Arctic&hemisphere=n&sensor=SSMIS17&ctab=visual#mapFirst a Government shutdown. Now a satellite shutdown? I hope these things don't come in threes
We obtain SSMIS instrument data from NOAA CLASS. They have been down several times in the past week for computer problems. When they get started again, they continue to provide data, but do not send us back data that was missed during the outage. We have ordered back data, but are waiting for it to arrive. As of Oct 30th 10 am PST, we are missing data for both F16 and F17 SSMIS during two time periods: Oct 23rd - 25th and Oct 27th - 29th.
Average ice extent for October was 8.10 million square kilometers (3.13 million square miles), making it the 6th lowest October extent in the 35-year satellite data record.
NSIDC reports a drop of -2.1M today:The reason is in column 4: 5.1 million km2 is missing. Actually all is missing and also November 9 is missing a bit more than the tiny 0.49k.
sourab,I don't know where you found the 9.29 and 8.86 figures.
@ggelsrinc - just examinining Wipneus' graphs above show previous periods of "leveling off" and minor reversals in refreeze. I think it may be notable that one of those appears to be in 2008. What sets this year apart looks to be magnitude. Neven noted elsewhere that the Arctic Oscillation is gone positive - strongly so, higher and more persistently than any time in the last year. Wind may be a factor, compressing the pack, as suggested by a powerful low squatting in the GIUK gap.Add to that, I suspect that airflow may be bringing a lot of heat, which would interfere with seawater dumping it into the atmosphere. Time to look at the weather maps to figure out what's being shoved around by the storms.
... but I see serious problems with refreeze and not serious problems with melt...
Quite so, ggelsrinc. More grist - have a look at the SST anomalies. That heat is coming from seawater. Temperatures posted by the DMI are pretty warm as well. If the oceanic heat can't get into the atmosphere, it would go straight into the ice. If the ice is relatively thin at the margins as we would expect at this point, mostly < 50cm, that heat would both melt and weaken it.http://www.esrl.noaa.gov/psd/map/clim/sst.shtml
Do not go gentle into that good night, Old age should burn and rage at close of day; Rage, rage against the dying of the light. Though wise men at their end know dark is right, Because their words had forked no lightning they Do not go gentle into that good night. Good men, the last wave by, crying how bright Their frail deeds might have danced in a green bay, Rage, rage against the dying of the light. Wild men who caught and sang the sun in flight, And learn, too late, they grieved it on its way, Do not go gentle into that good night. Grave men, near death, who see with blinding sight Blind eyes could blaze like meteors and be gay, Rage, rage against the dying of the light. And you, my father, there on the sad height, Curse, bless me now with your fierce tears, I pray. Do not go gentle into that good night. Rage, rage against the dying of the light.
Thanks for your reply. I wasn't questioning your integrity or honesty. I generally follow what is on NSIDC.org. So, those numbers were different than what you posted. I read that data from NSIDC website.http://nsidc.org/arcticseaicenews/charctic-interactive-sea-ice-graph/I am not sure if these numbers are delayed, inaccurate, or processed differently.
Reduce erroneous artifacts.On daily scales, these extent values can have fairly large variations, both due to real changes in ice extent from growth, melt, or from motion of the ice edge, and due to ephemeral weather and surface effects. To reduce erroneous variations, a 5-day trailing mean is used in the plot. This is calculated by averaging the extent value from a given day with the extent value from the previous four days to produce a 5-day average, so the value plotted for a day is the average of that day and the four previous days.
And there is no way the St Lawrence river is completely frozen from Quebec City east as the NSIDC map suggests.
The increase this November was the 14th largest on record.
Large downward step - very nearly a century break!
Overall, things look remarkably normal.
Cheers Buddy!Update for the week to January 25thThe current 1 day extent is 14,056,840km2, while the 5 day mean is on 13,954,210km2The daily anomaly (compared to 79-11) is at -689,540km2, a decrease from -793,260km2 last week. The anomaly compared to the 07, 11 and 12 average is at +142,990km2 a change from +107,730km2. We're currently 6th lowest on record, up from 5th last week.The average daily increase over the last 7 days was +50.4k/day, compared to the long term average of +35.6k/day, and the average of the last 5 years of +28.4k/day.The average long term increase over the next week is +35.9k/day, with the average of the last 5 years being +35.0k/day.The increase for the first 25 days of January is the 9th largest on record. For the largest total January gain on record, a daily average of at least 79.0k/day is required for the rest of the month, with the smallest gain requiring a loss of at least 73.2k/day.
