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Syowa Station
-O3-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +3 |
| Sampling |
| Sampling height |
: |
4 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
The air sample is discretely introduced into the analyzer.
Analysis is made every 12 seconds (Jan. 1997 - Jan. 2010) and every 15 seconds (Feb. 2010 - present). |
| Sampling environment |
: |
The observatory is located on East Ongul Island, Lützow-Holm Bay, East Queen Maud Land, East Antarctica.
The ground is covered with snow over 10 months, so only some mosses and lichens grow during the snowmelt period.
Annual mean air temperature is -10.4 °C.
Annual mean wind speed is 6.7 m/s. Prevailing wind direction is northeasterly. |
| Description for sampling analysis |
: |
Air is sampled from a stainless intake with about 10 liters per minute. The air sample is introduced to the observation system through an inlet tube made of Teflon. The flow rate in the gas analyzer is 1.5 liters per minute.
A glass drain pot is installed for the trap of snow and water.
A Teflon filter is used for the trap of the dust.
A ground height of intake:
Jan. 1997 - Apr. 30, 2008: about 5m (1 m high form the roof)
May. 1, 2008 - Sep. 29, 2008: about 6m (3 m high form the roof)
Sep. 30, 2008 - present: about 4m (1 m high form the roof) |
| Instrument and Analysis |
| Measurement method |
: |
Light absorption analysis (UV) |
| Current status and history of instrument |
: |
Jan. 1997 - Jan. 2010: model 1100 Dylec Inc.
Feb. 2010 - Jan. 2011: EG-3000F EBARA JITSUGYO CO.,LTD.
Feb. 2011 - Jan. 2012: model 1100 Dylec Inc.
Feb. 2012 - Jan. 2013: EG-3000F EBARA JITSUGYO CO.,LTD.
Feb. 2013 - Jan. 2014: model 1100 Dylec Inc.
Feb. 2014 - Jan. 2015: EG-3000F EBARA JITSUGYO CO.,LTD.
Feb. 2015 - present: model 1100 Dylec Inc.
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| Description of instrument |
: |
Measurement range: 0 to 200 ppb
Linearity: <= ± 2ppb
Resolution: <= 1 ppb
Repeatability: <= ± 2 ppb
Zero drift: <= ± 1ppb per Month
Span drift: <= ± 1ppb per Month |
| Calibration |
| Current scale employed in the measurement |
: |
NIST SRP |
| Measurement calibration |
: |
Zero point and spans of the three points (30, 60, 90 ppb) of the instrument are checked every two years with an ozone generator (TEI Model 49C-PS), which is calibrated against the WMO reference standard (SRP#2) at NIST every two years. |
| Scale and calibration(treasability) |
: |
Jan. 1997 - Feb. 2002: Original scale (KI method)
Mar. 2002 - present: the WMO scale.
The data during Jan. 1997 - Feb. 2002 are corrected according to the WMO scale. |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
The raw data from instrument is collected by the data acquisition system,and stored in the system as every 15 seconds (or 12 seconds, Jan.1997 – Jan. 2010) raw data. The data is checked at the site by an operator every day. All irregular data and information are recorded in a log book. The data are transmitted to the headquarters every month and are checked again. Finally, the measurement data are validated by the contributor at the headquarters after the last check. |
| Processing for averaging |
: |
Processing for Hourly Data:
Hourly data are taken from the arithmetic mean of observed 15 seconds data for one hour after the irregular and evident error data are rejected.
Background hourly data are adopted if hourly data satisfy the following conditions.
1. hourly data contain half of the number or more data that can be measured in one hour.
2. standard deviation of hourly data doesn't exceeding 0.3 ppb.
Selected hourly data are used for calculation of daily and monthly data. They are adopted if hourly data satisfy the following conditions.
1. hourly data contain half of the number or more data that can be measured in one hour.
Processing for Daily Data:
Daily data are taken from the arithmetic mean of selected hourly data.
Processing for Monthly Data:
Monthly data are taken from the arithmetic mean of selected hourly data. |
| Data flag |
: |
Hourly
0-6: no background condition
7: background condition
9: missing
Daily and Monthly
2: no valid hourly data
3: valid
9: missing
For the details, please refer to http://ds.data.jma.go.jp/gmd/wdcgg/pub/data/documents/JMA_flag.html |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
To provide critical data for research and study to reveal long term trends in the Antarctic. |
| Reference |
: |
Antarctic Record Vol.44;46;47;49;50;51;52;53;54;56;57;58
Annual Report on Atmospheric and Marine Environment Monitoring Data (DVD-ROM)
Antarctic Meteorological Data(CD-ROM) |
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| submitted by Japan Meteorological Agency |
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