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Re: Air Temperature Measurement... of time constants and records


sounds entirely plausible, but one assumes the effect would be to see more extremes in both directions, in roughly equal numbers? Of course that might be happening, with the new record lows either being culled by reporting bias, or also being blamed on global worming.

Re: Air Temperature Measurement... of time constants and records

Actually I guess the probe is always going to be playing catch-up with the air temperature. A true extreme will never be measured unless the probe is infinitely small or the temperature remains at exactly that extreme for a very long time (at least until the difference in temperature falls below the measurement error). That latter point might also affect the contention - measurement error was presumably much higher with mercury than modern probes. So I am no longer sure that I'd expect to see more extremes with modern equipment.

Re: Air Temperature Measurement... of time constants and records

Or perhaps, due to the directional flow of heat, one is more likely to encounter small packets of warmer air than colder ones.

Re: Air Temperature Measurement... of time constants and records

There's a followup by Warwick Hughes who received some expert feedback on the transition of temperature measurement technology.

His expert's response (in part) says:

The move to AWS and the concurrent shift of many sites from Town Post Office to airports is like a fault line through the Australian climate records. In many cases the site change is not registered in the data because both have the same station number. This fault line is papered over by the analysis of the data using GIS procedures – any analysis is based on the stations reporting for that day/month and does not require a continuity of record at the site. Thus the ‘Australian’ daily maximum, and other BoM published analyses represents the available data interpolated to grid points and then areal averaging the gridpoints, not the data. For most practical purposes this is OK; the problems arise when trends or new records are claimed!

More at the comment by following the link above.

So the discontinuity/incompatability is subjected to a sponge-bath of hog-wash; to make it look like it's all been taken care of.

Keep washing those hogs. They've not yet been cleared for take-off.

It seems to me that the people "responsible" for managing the temperature dat have near-enough to no idea about how the data are obtained; or they don't care at all because they'll adjust them to fit their climate models anyway.

P.S. Thanks for the mention in the Number of the Month.