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Pilar Observatorio
-O3-
| Observation |
| Category |
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Air sampling observation |
| Situation |
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ongoing |
| Time zone |
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UTC |
| Sampling |
| Sampling height |
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3 |
| Description |
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continuous |
| Sampling and analysis frequency |
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Continuous, measuring interval is 10 seconds (7 seconds flushing and 3 seconds integrating time). |
| Sampling environment |
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The Pilar Observatory is located at the centre of the Country (31.4°S, 63.53°W) at an altitude of 338 meters a.s.l. The distance from the Capital of Cordoba is approximately 60 Km.
The prevailing winds blow from the North-Northwestern sector (N-NW). The station is surrounded by a pasture land or field, but there is a cold-storage plant 2,5 kilometers to the North.
The average annual rainfall and relative humidity are 786 mm and 69%, respectively. |
| Description for sampling analysis |
: |
Sampling and Analyses Intake height: 3 m above ground on top of the station building, 1 m above the roof.
Inlet/Manifold: from there connections ozone instruments by t inch PFA tubing, length approx. 6 m to instrument.
Total flow rate 1.6 liter per minute
Teflon inlet filter before analyzer, exchanged monthly.
Residence time in the sampling line: approx. 2 s
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| Instrument and Analysis |
| Measurement method |
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Light absorption analysis (UV) |
| Current status and history of instrument |
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Instrument model TEI 49 \#49981-285
Product name: Model 49
Manufacturer: Thermo Environmental Instruments Inc
Since May. 1995 - to Aug. 1998 continued and Nov. 1998.
Since Jul. 1999 - to Oct 1999 continued.
Since Sep. 2004 - to Jan 2006 continued.
Since Mar. 2006 - to May 2006 continued.
Since Aug. 2006 - to Dec 2007 continued.
Since Oct. 2008 - to Dec 2008 continued and Feb. 2008.
Since Apr. 2009 - to Mar. 2010 continued.
Since Jun. 2010 Out of service throughout the year.
Instrument model TEI 49 \#54577-300
Product name: Model 49
Manufacturer: Thermo Environmental Instruments Inc
Period in use: from 2011 - at present
2011 It continues to be out of service.
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| Description of instrument |
: |
TEI 49 characteristics:
Internal ozone generator
Range: 0-100 ppb
Precision: 0.002 ppm
Linearity: ± 0.001 ppm
Noise: ± 0.001 ppm
Minimum detectable: Limit 0.002 ppm
Response Time: (0 to 95%) 20 seconds
Lag time: 10 seconds
Flow Rate: 1 – 3 liters per minutes
Analog output: 0-10 V
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| Calibration |
| Current scale employed in the measurement |
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Travelling standard, traceable to NIST |
| Measurement calibration |
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Intercomparison at the Regional Calibration Centre (RIII WMO) for Surface Ozone (RCC-BsAs) by WCC-Empa in 2006 and 2010. |
| Scale and calibration(treasability) |
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The data refer to the WCC O3 standard.
Absolute scale, ppb.
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| Data Processing |
| Measurement unit |
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ppb |
| Data processing |
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You should considerate that the wind blows from the North, the data since they are have been probably polluted by the cold-storage plant, since mid-2004. |
| Processing for averaging |
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Processing for Hourly Data:
The hourly mean value is calculated as the arithmetic mean value of the samples taken every 15 minutes.
Processing for Daily Data:
The daily value is calculated as the arithmetic mean value of the 24 hourly values taken during the day.
Processing for Monthly Data:
The monthly values are calculated as the arithmetic mean value of the days for that month. |
| Data flag |
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Flag 0– Valid data.
Flag 1- Invalid or suspect data |
| Data remarks |
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| Other Information |
| Scientific aim |
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| Reference |
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| submitted by National Weather Service |
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