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El Tololo
-O3-
| Observation |
| Category |
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Air sampling observation |
| Situation |
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ongoing |
| Time zone |
: |
UTC |
| Sampling |
| Sampling height |
: |
5 |
| Description |
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continuous |
| Sampling and analysis frequency |
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data are continuously recorded.
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| Sampling environment |
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El Tololo is a background station in a pristine arid environment. Local emissions are rare and vegetation is sparse.
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| Description for sampling analysis |
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tubing material: PFA 1/4" OD; total inlet length approx. 8m; flow rate: 1 lpm; no drying prior to analysis
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| Instrument and Analysis |
| Measurement method |
: |
Light absorption analysis (UV) |
| Current status and history of instrument |
: |
May 2013 until now: Thermo Environmental Instruments Inc., TEI49C, S/N 49C-72417-371 |
| Description of instrument |
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| Calibration |
| Current scale employed in the measurement |
: |
NIST (Standard Reference Photometer) |
| Measurement calibration |
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| Scale and calibration(treasability) |
: |
NIST SRP #15 (at WCC-Empa, Switzerland) |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
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Quality assurance procedures involve time series plots and consistency checks. Data are given as mole fractions with respect to moist air, i.e. no sample drying was applied prior to analysis. Please refer to the standard literature and make use of the available meteorological data to convert the data from moist to dry air mole fractions. |
| Processing for averaging |
: |
Processing for Hourly Data:
high-resolution data are aggregated to 1min averages before hourly averages are calculated. Thus, ND (the number of detections) refers to the number of available 1min averages within the respective hour.
Processing for Daily Data:
hourly averages are aggregated to daily means. Thus, ND (the number of detections) refers to the number of available hourly averages within the respective day.
Processing for Monthly Data:
daily data are aggregated to monthly means. Thus, ND (the number of detections) refers to the number of available daily averages within the respective month.
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| Data flag |
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| Data remarks |
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| Other Information |
| Scientific aim |
: |
long-term trend of background mole fractions in South America
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| Reference |
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The observations are supported by the Federal Office of Meteorology and Climatology MeteoSwiss through the project Capacity Building and Twinning for Climate Observing Systems (CATCOS) between the Swiss Agency for Development and Cooperation (SDC) and MeteoSwiss.
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| submitted by Direccion Meteorologica de Chile / Swiss Federal Laboratories for Materials Testing and Research |
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