UPDATE: 8th record
2013 Day 71 was the 7th daily record for Antarctic Sea Ice Extent. And the 4th in a row.
If you look at the 2008 record setting run ice extent was so far ahead of previous years it was hard to believe any of those records would be broken.
Yet 2013 is doing it.
What is the URL for the source of daily data? Thanks.
Comment by David Appell — March 14, 2013 @ 4:59 PM |
ftp://sidads.colorado.edu/DATASETS/NOAA/G02135/south/daily/data/
Comment by sunshinehours1 — March 14, 2013 @ 5:09 PM |
You’re not accounting for leap years. If you just use the day of the year, records are, as you write, being set, but if you use the actual date of the year 2013 is currently behind 2008.
Comment by David Appell — March 18, 2013 @ 4:03 PM |
What a bizarre assertion!
Comment by sunshinehours1 — March 18, 2013 @ 4:36 PM |
Why bizarre? The data shows an Antarctic SIE of
4.93 Mkm2 for 3/13/2008, the 73rd day of that year
5.05 Mkm2 for 3/14/2008, the 74th day of that year.
4.96 Mkm2 for 3/14/2013, the 73rd day of this year.
So it matters whether you’re comparing equivalent dates, or equivalent days of the year.
Is one preferred over the other? (And why?)
Comment by David Appell — March 18, 2013 @ 4:49 PM
Is January 1st the 1st day of the year? Day 1? Comparing day 1 to day 1 makes more sense to me. Comparing day 73 to day 73 makes more sense to me.
Comment by sunshinehours1 — March 18, 2013 @ 5:27 PM
No, January 1st isn’t the first day of the year if it’s a leap year; it’s somethinig like 99.7% of the first day of the year. As the year goes on, the difference matters more. As I showed above, it already matters for this year.
Comment by David Appell — March 18, 2013 @ 5:42 PM
Actually Jan 1st of 2013 is the closest you can get to the first day of any year because Feb 29 2012 caught the calendar up.
Jan 2012 is probably almost a full day behind and Jan 2011 is 3/4 a day behind etc.
Maybe you can convince NSIDC to put our hourly data and we can compare via hours since the winter solstice.
But until then …. Jan 1 is the 1st day or the year.
Comment by sunshinehours1 — March 18, 2013 @ 5:57 PM
Or Jan 2012 is a little bit of a day ahead, and Jan 2011 is 1/4 a day ahead, etc.
Comment by David Appell — March 18, 2013 @ 6:04 PM