Changing equipment.
Changing sites.
Repeated "adjustments".
There is not enough interest
in the quality of the data
behind climate alarmism.
The first
Brisbane, Australia
weather station
( number 40214 )
opened in 1840,
179 years ago.
The Australian
Bureau of Meteorology
NOW measures temperatures
from electronic probes
-- mercury thermometers
were once used.
The Bureau makes adjustments
to measured temperatures,
currently known as ACORN-SAT,
which are then used for
national and global averages.
Temperature data recorded
at Brisbane, Australia
station number 40214
are publicly available from
January 1887 to March 1986,
with measurements taken using
the SAME mercury thermometer
at the SAME place every day.
Although from 1840 to 1896,
the mercury thermometer
was housed in a Glaisher stand,
rather than a Stevenson screen.
After 1986, there were many
site moves and equipment changes.
Many equipment changes,
although perhaps not every one,
are shown on the chart below,
but no overlapping temperature
data are available for comparisons:
The very long, continuous
mercury thermometer record
does NOT show evidence
of man made global warming.
Maximum temperatures recorded
at station number 040214,
with a mercury thermometer,
in a Stevenson screen ,
as downloaded from
the Bureau’s ADAM
database:
The official Brisbane temperature record
( annual average maximum temperature )
is CURRENTLY from a combination
of two official Bureau series recorded
at the airport (Series 40223 and 40842),
and subsequently "adjusted":
ACORN-SAT versions 1 and 2
are compared on the chart below.
It's no surprise that the change,
from version 1 to version 2,
includes "cooling the past",
which creates more global
warming out of thin air.
The latest official ACORN-SAT
maximum temperature series
for Brisbane suggests warming
of +0.9 degrees Celsius per century.
The official data does NOT show
hot temperatures in 1902,
1912 and 1915, and the period
of overall cooling, to about 1960.
The Australia BOM's own policies,
for when equipment is changed,
state that a new station number
should be assigned, and
there should be at least three years
(preferably five) of overlapping
temperature recordings,
using both instruments
at the same location.
If any parallel data exist,
the Bureau has not made
the data accessible.
It would be held by the
Australian National Archive
as manual recordings
into observation books,
never digitized.
Since 1996 the temperatures
for the Brisbane airport
are from electronic probes,
not a mercury thermometer.
A probe may be
much more sensitive
to temperature change
than a mercury thermometer,
and record warmer peak
temperatures for the same day,
that only lasted for a short period
of time.
That's why overlapping data,
from two different instruments
located inside the same
Stevenson screen weather station
can be very useful ... but don't
hold your breath trying to find
the data, assuming they exist.