Cape Grim Baseline Air Pollution Station METEOROLOGICAL DATA ============================================================ A. Acknowledgements. --------------------- Acknowledgement 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. Further acknowledgement of others who supported the ACE-1 program at Cape Grim is at the discretion of the authors or presenters. B. Station Specification ------------------------- The station is at 40 deg 40' 56" S latitude, 144 deg 41' 18" E longitude. The roofdeck elevation is 94 metres above sea level. Wind measuring instruments are located at a height of 50 metres on the west side of a 74m tower. The station operates on Australian Eastern Standard Time (UTC + 10 hours) all year round. C. Raw Minute Data ------------------- 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 degC Rosemount platinum thermometer in Stevenson's screen and Rosemount bridge. 04 Wet bulb depr degC 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 = (190deg <= 50m wind <= 280deg) AND (CN < 600) (Values: Off ~= 0.0; On ~= 12.0) CN from TSI 3020 instrument. 18 Baseline #2 On = (190deg <= 50m wind <= 280deg) AND (CN < 1200) (Values: Off ~= 0.0; On ~= 12.0) (baseline #2 new criteria since 15 Nov 95) CN from TSI 3020 instrument. 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 degC Vaisala DTS12 mounted in Vaisala DTR11 radiation shield. "Sub-channel" Statistic ------------------------- 1 minute's mean 2 standard deviation 3 minute's maximum 4 minute's minimum 5 1st reading of the minute D. Processed Hourly Data ------------------------- At the end of each month, these data are computed from the raw minute data. They are HOURLY statistics. At the same time 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) 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) 2/1 vector mean wind speed (km/h) 2/2 vector mean wind direction (deg from N) 2/4 persistence 7. air temperature statistics 7/1 mean air temperature (deg C) 7/2 max air temperature (deg C) 7/3 min air temperature (deg C) 7/4 standard deviation 8. relative humidity statistics* *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 9/1 mean pressure (hPa) 9/2 max pressure (hPa) 9/3 min pressure (hPa) 9/4 standard deviation 10. rainfall statistics 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* *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 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 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) 14/1 vector mean wind speed (km/h) 14/2 vector mean wind direction (deg from N) 14/4 persistence Raw Minute Data File Names ========================== File Name Contains For --------- -------- --- temp1215.min temp ground level Dec 15 wbd1215.min wet bulb depression Dec 15 pres1215.min atmospheric pressure Dec 15 blin1215.min baseline #1 & #2 Dec 15 hu501215.min humidity 50m Dec 15 wd501215.min wind dir 50m Dec 15 ws501215.min wind speed 50m Dec 15 wd101215.min wind dir 10m Dec 15 ws101215.min wind speed 10m Dec 15 te501215.min temperature 50m Dec 15 Hourly Data File Names ====================== Files contain data for Nov 15 to Dec 15, 1995 If height relevant but not mentioned, then assume "ground level". Eg temperature is ground level. File name Contains --------- -------- wind10s.hr wind 10m scalar wind10v.hr wind 10m vector temp.hr temperature relhum.hr relative humidity pressure.hr atmospheric pressure rain.hr rainfall abshum.hr absolute humidity baseline.hr baseline wind50s.hr wind 50m scalar wind50v.hr wind 50m vector