|Indicator Definition||Monthly means of daily temperatures at the 100hPa level (lower stratosphere),|
from radiosonde soundings above Australian Antarctic stations Casey, Davis,
Mawson and Macquarie Island.
Bureau of Meteorology, Department of the Environment and Heritage Details
|The following 11 out of 15 criteria
|Date Input||Monthly measurements|
Macquarie Island Details
Geographic Coverage is
Longitude (61.0 to 159.0)
|Rationale For Indicator Selection||Global climate models show warming in response to increased greenhouse gas|
(carbon dioxide, methane etc) concentrations in the atmosphere; this is called
the "enhanced greenhouse effect". There is interest in climate variability and
change not just at the surface, but extending up into the atmosphere. There is
evidence of warming in the lower troposphere, but cooling in the lower
stratosphere. Ozone depletion processes are also closely linked to
|Design and Strategy For Indicator Monitoring Program||Spatial Scale: Australian Antarctic stations: Casey (lat 660 16' 54.5" S,|
long 1100 31' 39.4" E), Davis (lat 680 34' 35.8" S, long 770 58' 02.6" E),
Mawson (lat 670 36' 09.7" S, long 620 52' 25.7" E) and Macquarie Island
(lat 540 37' 59.9" S, long 1580 52' 59.9" E).
Temporal scale: Monthly.
Measurement technique: Radiosonde.
There is need to develop a high-quality data set from the available data,
correcting erroneous data and estimating missing data. Adjustment may be
necessary for changes in instrumentation or observing practices.
Some of these changes are documented in the station history files held by the
Regional Observations Section. These history files are currently held as paper
records, although more recent information is held electronically and there is
an effort to digitise the older records.
Before the data can be used for the detection of change, a concerted effort
will need to be made to identify deficiencies in the data, and then make
compensations where possible. This is made more difficult by the lack of
suitable comparison sites.
Over recent years satellite data exist, which could be used in conjunction
with radiosonde data. Satellite data and radiosonde data from other nations
should lead to a greater coverage.
Temporal range of the available data, as described by the metadata record, is from 01-Apr-48.
Timespan: February-1959 to November-2013.
Number of data points: 2415.
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Casey: Air Temperature
Casey: Air Temperature Anomaly
Davis: Air Temperature