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Danum Valley GAW Baseline Station
-O3-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +8 |
| Sampling |
| Sampling height |
: |
4.6 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Continuous flow and data is analyzed every 60 seconds |
| Sampling environment |
: |
The station is located in the largest tropical lowland conservation area of rainforest in Malaysia, the 438km2 Danum Valley Conservation Area. The nearest town, Lahad Datu is about 70km away. |
| Description for sampling analysis |
: |
Air is sampled from an intake with flow rate 1-3 litres min-1. |
| Instrument and Analysis |
| Measurement method |
: |
Light absorption analysis (UV) |
| Current status and history of instrument |
: |
Period in use Product Name Manufacturer
2007 January - present Model 49i Thermo Electron
Corporation
|
| Description of instrument |
: |
Range: 0 to 1000 ppb.
Sensitivity: The lower detectable limit is 1.0 ppb
Zero drift: less than 1ppb per 24 hours
Span drift: less than 1 percent per month (including drift of transducers)
Linearity: ±1% of full scale
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| Calibration |
| Current scale employed in the measurement |
: |
NIST |
| Measurement calibration |
: |
|
| Scale and calibration(treasability) |
: |
An Ozone Primary Standard, Model 49i-PS was used for calibration. |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
The raw data from the instrument is collected by data acquisition system and store in the system as one minute average raw data. |
| Processing for averaging |
: |
Processing for Hourly Data:
Hourly data are generated by arithmetic means from the minute
data without including invalid data.
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| Data flag |
: |
Flag Description for hourly data from 2011 onwards
652 : Construction/activity nearby
699 : Mechanical or instrumental problem
980 : Missing due to calibration
999 : Missing measurement, unspecified reason
000 : Valid data |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
To monitor the surface ozone concentrations in tropical rainforest environment
To support WMO GAW programme
To study atmospheric-biosphere interactions in a tropical rainforest environment, long range transport of pollutants and ability of forests to act as sinks for atmospheric pollutants. |
| Reference |
: |
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| submitted by Malaysian Meteorological Department |
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