Whilst looking at other things I checked the monthly data ratio of sea ice extent to area. This might interest others so here it is.
Although El Nino is not a particular interest of mine JAXA have a new web page which I think is good.
Click the image or follow this link.
The web server might be fairly slow responding if my experience from the UK is representative, no big deal. This might be because a lot of images are rendered and loaded before the page displays.
A chance finding during research on long out of print books: –
WATCH is a database of copyright contacts for writers, artists, and prominent people in other creative fields. It is a joint project of the Harry Ransom Center and University of Reading Library in England. Founded in 1994 as a resource principally for copyright questions about literary manuscripts held in the U.S. and the U.K., it has now grown into one of the largest databases of copyright holders in the world.
All individuals and organizations listed as “Contacts” in the WATCH File have indicated that they are the holder of an author’s copyright for unpublished material or that they are the holder’s representative or contact. All individuals have given written permission to have their names and addresses included in the WATCH File.
Over at Tallbloke’s the subject has got around to the stratosphere, including a post by Rog reporting on a lecture he attended at Leeds Uni. given by Susan Solomon.
Seems apt to cover Dobson as a backgrounder.
As it happens I’ve been moving in the same direction as part of unravelling atmospheric matters. Image right is a thumbnail of an old page at Oxford Uni. Physics department which gives a potted history of G.M.B Dobson, a local physicist who made a life’s work of measurement of high atmosphere ozone. The measurement unit the Dobson is in his honour. Even more remarkably his photoelectric spectrophotometer is the standard instrument today, used around the world.
Click image or link
For example, World Meteorological Organisation “Operations Handbook – Ozone Observations with a Dobson Spectrophotometer. https://www.wmo.int/pages/prog/arep/gaw/documents/GAW183-Dobson-WEB.pdf and much more is available.
Figure 1 is demonstrating the impossibility of the commonly provided assertions by the scientific community of an exponential or similar melt away of Arctic ice. A very precise (13 term) annual cycle has been hindcast from daily data back into detrended monthly data. The model was rebased to monthly and subtracted from actual monthly data.
Any curvature must appear in one or both of the straight line trend or residual. It does not.
Figure 1 also exhibits the satellite usage timeline. Each one of these satellites occupied a different orbit, all but one definitely a decaying orbit leading to Nyquist issues which are liable to alias to a long term trend. The instruments carried were all different and used different processing software. All instruments had a different observation field geometry. Human judgement has been used to attempt filling in where sensing surface polorisation destroys contrast, sea surface and ice looking the same. Modelling is used where there is unknown data. And other issues.