About the Argo ocean monitoring system, Reuters market analyst Gerard Wynn writes:
The world’s oceans have absorbed more than 90 per cent of global warming since the mid-20th century, making accurate measurements of deep ocean temperatures vital to predicting how much global temperatures and sea levels are going to rise.
In 1999, a group of 30 countries launched the Argo programme as the first global, subsurface ocean observing system…
The data so far confirm a warming trend in the oceans over the past century.
Significantly, two recent publications suggest that the deep oceans have warmed particularly quickly in the past decade.
Later, Wynn puts in the caveats:
Argo is a recent dataset and so may not be able to distinguish longer natural cycles of ocean warming. And there are difficulties comparing observations before and after the Argo data because of differences in sampling method, instrument and geographical distribution.
In addition, there were initial problems with reliability of the Argo data, which meant accurate conclusions could only be drawn from 2005, and some instrument errors may remain undetected.