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Cape Grim Baseline Air Pollution Station   
Rain gauge and the wind (zoom)

Meteorological Data (for Cape Grim, Tasmania)

How to request data Station's south side
Processed Hourly Data
scalar wind (10m): vector wind (10m): air temp: relative humidity: barometric pressure: rainfall: absolute humidity: baseline: scalar wind (50m): vector wind (50m)
Raw Minute Data
Acknowledgments
Station Specifications
and the effect of the cliff on airflow


A. What are these Data?
These data are measurements taken at Cape Grim, Tasmania; they do not apply to other locations. They are preliminary only - they may contain errors - and are made available primarily for atmospheric research.

B. How to Request Data
Select what you want from the lists below, and for what period, and use our feedback form. We'll let you know if there are any restrictions or fees.

C. Processed Hourly Data Top
These data are computed from the raw minute data (see C below). They are HOURLY statistics. A limited quality control is applied. Data is deleted if log books indicate that the instrument was faulty or if a perusal of the temperature or pressure revealed bad values.

1. scalar wind statistics (10m) Top
1/1 scalar mean wind direction (deg from N)
1/2 scalar max wind direction (deg from N)
1/3 scalar min wind direction (deg from N)
1/4 number of north crossings
1/5 scalar mean wind speed (km/h)

2. vector wind statistics (10m) Top
2/1 vector mean wind speed (km/h)
2/2 vector mean wind direction (deg from N)
2/4 persistence

7. air temperature statistics Top
7/1 mean air temperature (°C)
7/2 max air temperature (°C)
7/3 min air temperature (°C)
7/4 standard deviation

8. relative humidity statistics* Top
*calculated from ground-level wet and dry bulb temperatures and pressure.
8/1 mean relative humidity (%)
8/2 max relative humidity (%)
8/3 min relative humidity (%)
8/4 standard deviation

9. barometric pressure statistics Top
9/1 mean pressure (hPa)
9/2 max pressure (hPa)
9/3 min pressure (hPa)
9/4 standard deviation

10. rainfall statistics Top
10/1 rainfall for this hour (mm)
10/2 rainfall so far today (mm)
10/3 rainfall so far this month (mm)
10/4 rainfall so far this year (mm)

11. absolute humidity statistics* Top
*calculated from ground-level wet and dry bulb temperatures and pressure.
11/1 mean absolute humidity (g/cu m)
11/2 max absolute humidity (g/cu m)
11/3 min absolute humidity (g/cu m)
11/4 standard deviation

12. baseline statistics NOT PRE-JANUARY 86 Top
12/1 baseline minutes in this hour
12/2 baseline minutes so far today
12/3 baseline minutes so far this month
12/4 baseline minutes so far this year

13. scalar wind statistics (50m) NOT PRE-JUNE 87 Top
13/1 scalar mean wind direction (deg from N)
13/2 scalar max wind direction (deg from N)
13/3 scalar min wind direction (deg from N)
13/4 number of north crossings
13/5 scalar mean wind speed (km/h)

14. vector wind statistics (50m) Top
14/1 vector mean wind speed (km/h)
14/2 vector mean wind direction (deg from N)
14/4 persistence

D. Raw Minute Data Top
Voltages from the instruments are read once every six seconds. Each minute, five statistics for each channel are computed and stored.
Channel Quantity & Units Instrument, etc.
03 Temperature°C Rosemount platinum thermometer in Stevenson's screen and Rosemount bridge.
04 Wet bulb depression °C Rosemount platinum thermometer in Stevenson's screen and Rosemount bridge.
05 Pressure hPa Rosemount transducer via static head from roof deck.
17 Baseline switch
On = (190° <=50mWD<=280° ) & (CN<600) 		CN from TSI 3020 instrument.
(Values: Off ~= 0.0; On ~= 12.0)
38 30 m wind dir. (deg from N)  
39 30 m wind spd km/h  
41 50 m wind dir. (deg from N) Vaisala WAV15
42 50 m wind spd km/h Vaisala WAA15
48 10 m wind dir. (deg from N) Vaisala WAV15
49 10 m wind spd km/h Vaisala WAA15
57 50m Humidity % Vaisala HMP35M mounted in Vaisala DTR11 radiation shield.
58 50m Temperature °C Vaisala DTS12 mounted in Vaisala DTR11 radiation shield.

Sub-channel Statistic
1 Minute's mean (or median)
2 Standard deviation
3 Minute's maximum
4 Minute's minimum
5 1st reading of the minute


E. Acknowledgments. Top
Acknowledgment should be made of the Cape Grim Baseline Air Pollution Station and Arthur Downey of the Australian Bureau of Meteorology in any publication, presentation or report which makes use of these data.

F. Station Specification Top
Baines, PG and Murray D. (1991) Modelling of the Airflow over Cape Grim,
Baseline Atmospheric Program Australia 1991, 20-24.

Baines, PG and Murray D. (2000) Airflow over Cape Grim - A laboratory study for optimum observation sites,
Baseline Atmospheric (Australia) 1999-2000 , 13-17.


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