You are cherry-picking from the abstract. The article is about some newer and more precise measurements. The comment you quoted is only to contrast with the method described.
I don’t trust abstracts …
… because I have found too many of the abstracts are purposely written to appear to be politically correct because the reviewers often do not read the whole study. If the report and more important, the abstract, is not politically correct often/sometimes the report will not get published. That’s why they call it “pal reviewed” instead of “peer reviewed”.
[This was particularly obvious when I was interested in looking at volcanic emissions analyses and certain chemicals from naturally occurring sources were politically incorrect. In fact, there is now a HUGE volume of study on
Naturally Occurring Sources of Organohalogens …
However, the politically correct forces
denied that they existed. The political correct orthodoxy is that there are no natural sources but that they are all man-made. But, in fact, over time, we found that there are more than 5,000 Naturally Occurring Organohalogens.
VERY POLITICALLY INCORRECT. The main researcher nowadays is Dr. Gordon Gribble at Dartmouth. Gribble not only publishes a LOT but also somebody hosts a periodic world convention to discuss. Worth looking up. A lot of researchers did a lot of work and then found that they were denied publication. Gribble is not the guy who faked abstracts; it was someone else and a lot of people have published on these issues and since I have more than 90* boxes of studies and reports, and we have moved and everything is in disarray, there is no way to find them easily.
But you need to read the full reports and not be limited to the abstracts.]
*more than 97 boxes of studies and papers … and then we found more boxes.
[At the time, I was very interested in Mount Erebus which is the only continuous caldera volcano and it is at some very high altitude. Worth checking out. It is so difficult to visit that a lot of false claims are made about it so it is difficult to collect data and difficult to verify data. You can die visiting it if you get hit with ejecta. ]
[A lot of recent volcanic emissions now provide a tremendous amount of recent data.]
However, I have also found that college reference librarians have a policy … they don’t charge … and they have a policy whereby they can get full papers for free … and they request research papers from issuers and other institutions on the same basis.
I have been able to get
many dozens of papers this way; the librarians enjoy it because the stuff I request is so different from what they normally are asked for.
I moved away, so my college connection has been lost.
But it’s all for free. They were alarmed because I used to pay my own cash for the papers and they said payment was unnecessary and they could get the papers for me for free.
So, if any of you all are interested in looking at the full report instead of the abstract, please consider visiting or calling a nearby college or university.