Instrument change a ~decade ago –
amazing nobody at GHCN has noticed this complete failure to calibrate the new instrument with what it replaced – data from KNMI Climate Explorer. Minimum affected too. This has historic significance because Hokitika was one of the “rural” series in Jones original global dataset in the 1980’s that had a ~century of data. Describing motor neuron disease Motor neuron disease is a disorder get viagra which is faced only by men. viagra levitra viagra It has 25 alkaloids and multiple vitamins which are essential for an effective treatment. The common opinion among males is that after an intake of , their sex drive is a common mater that is faced by majority of both men and women. The medications would only amplify that sign and allow men to function naturally. cipla viagra generic Ruined for good now. I think the NZ Metservice runs the stations.
And we thought we had problems. Maybe they should get BOM to review their systems and give them a tick of approval?
Ken
Looks like global warming will make your thermometer less accurate.
@Ken Stewart
That’s exactly what did happen, although Hoktika was not originally part of the issue (not known at that stage).
After admitting in court that it had no clue at all as to what state its’ temperature records were actually in, the NZ authority (which at that stage had the grace to blush – not now, I think) asked the Aus BoM for help. So the BoM showed them how to homogenise away from the public gaze … and so it rests, till now.
This is beyond disgrace. The Green Blob has succeeded in destroying us.
This could be repaired with 1 year of data from a calibrated device side-by-side. Synch the clocks for the run. Use the reading offsets to profile the error factor in the current instrument.
After the year, sunset the uncalibrated instrument, leaving with the side-by-side one active.
Calculate offsets for the uncalibrated readings, and compare with the period prior as a sanity check
It sure can be interesting to plot daily data rather than the popular methodology of eliminating unpleasant noise with monthly or even annual smoothing!
I’m distracted by other things for a week or two but a quick few points:
* I clicked the KNMI link and at first sight don’t understand why the third figure displays quite different seasonal profiles in anomalies versus absolutes in the first.
* My eyeballs suggest a small step-change down from about 1990 to 2006 in the absolutes and, me being a nasty suspicious type, I wonder if maybe that might have been due to some other site or instrument change.
* The big change in about 2006 seems to be a bit late in the era of AWS, and New Zealanders are not known for being slow in coming forward.
A spectacular find Warwick!
Who wants the truth to emerge?
Not our new government anyway.
Cheers
Roger
I notice that the “fraction missing” of maxima in the KNMI charts shoots up from 0-2% to c.15% at the same time (c. 2006). For minima, it shoots up from a few per cent to nearly 50%.
So the new instrument seems to nod off during the day, and even more so at night. Its “percentage missing” though is slowly falling in recent years. The thermometer has realised what a crisis this global warming business really is, and knows it must lift its game.
There are two current long-running mean air temperature records for Hokitika Airport. In the NIWA cliflo database these are:
Hokitika Aero (code 3909) starting before 1982
Hokitica Aws (code 3910) starting in 1982
Both are current to the most recent completed month.
I think 3909 should be the old max/min thermometer record. Look them up individually and see if that solves the issue.
There is a new one as well being:
Hokitika Ews (code 41322) commencing about Feb 2016
Here are another two Hokitika weather stations or they might be duplicates of others.
First “Hokitika”
fireweather.niwa.co.nz/site/Hokitika
Then “Hokitika Aero” which produces a very different less continuous looking data stream
fireweather.niwa.co.nz/site/Hokitika%20Aero
Both at different sites near the Aerodrome.
But wait, there is more at the National Rural Fire Authority www page
fireweather.nrfa.org.nz/
pages where they have data tables including “Hokitika Aero”.
The Hokitika temperature record was put together by splicing several records from different locations. Locations are:
Hokitika Town (Fitzherbert Street prior to the construction of the current airport. Upt ot about 1946?
Hokitika Southside (at the old aerodrome). From about 1943 to 1964.
Hokitika Aero (Current airport). From 1964 onward.
There is a NIWA document dating from about 2010/11 explaining how these records are spliced together.