12 years ago, I pointed out to NSIDC in this post: Errors in publicly presented data – Worth blogging about?
Because they told me it “wasn’t worth blogging about” in this comment that was posted on WUWT by NSIDC’s chief research scientist, Dr. Walt Meier:
We’re looking into it. For the moment, we’ve removed the data from the timeseries plot.
You need to remember that this is near real-time data and there can be data dropouts and bad data due to satellite issues. While the processing is automatic, the QC is partly manual. Thus errors do happen from time to time and one shouldn’t draw any dramatic conclusions from recent data.
I’m not sure why you think things like this are worth blogging about. Data is not perfect, especially near real-time data. That’s not news.
In the prior thread I raised a question of why there was a large downward jump in sea ice extent on the graph presented by NSIDC’s Artic Sea Ice News page. The image below was the reason, a million-plus square kilometers of Arctic sea ice went missing. Note the blue line.
Click for larger image
Well, it turned out that is WAS worth blogging about and it WAS news, because the satellite sensor failed, as we published later:
It sure looks to me like it has happened again.
NSIDC says now:
NSIDC continues to investigate errors in our sea ice processing, and we are upgrading software to address the errors. Daily Sea Ice Index/Arctic Sea Ice News and Analysis values after February 19 are erroneous. We will post new data as soon as the software upgrades are implemented.
The old image from Feb 23rd they have on the website now only shows a dip.
But the interactive chart they have shows a clear dropout of data:
I wonder how long it will be before they fess up and say the satellite sensor has failed rather than bluster about “processing errors”?