geomon

Global Earth Observation and Monitoring
of the atmosphere


Station Report Card for Harwell (GB36)

Site Identity

Name:Harwell
GEOmon ID:GB36
EMEP ID:GB36
GAW ID:
Longitude:-1.317 (°E)
Latitude:51.567 (°N)
Altitude: 137 (m) above sea level
Fig.: Location of Site

Measurements

The GEOmon activity 2.1 focuses on surface observations of ozone, nitrogen dioxide and carbon monoxide. At most stations presented here, measurements of several other trace gases and aerosol parameters are also available but are not listed here. Refer to GAWSIS for more information on other parameters.

The complete set of preliminary harmonized data can be downloaded here: (hourly, daily data, data description).
Data of the site Harwell can be downloaded here: (hourly, daily data, data description)
Ozone Measurements
Height of O3 inlet:4 (m) Length of O3 sample line:5 (m)
O3 sampling method:Continuous O3 analysis method:UV-Absorption
O3 sampling interval:
O3 calibration with NIST standard:3 month(s) Location of used NIST standard:NPL UK
First measurement in dataset:1990-01-01 00:00 Last measurement in dataset:2005-12-31 00:00
Data coverage: 95.3 (%) Data source/provider: EMEP
(status: 2008-05-09)
Comments:None

Nitrogen Dioxide Measurements
Height of NO2 inlet:4 (m) Length of NO2 sampling line:5 (m)
NO2 sampling method:Continuous NO2 analysis method:Chemiluminescence (CL)
NO2 sampling frequency:
NO2 calibration with primary standard:NPL
First measurement in dataset:1995-09-11 00:00 Last measurement in dataset:2003-01-01 00:00
Data coverage: 77.3 (%) Data source/provider: EMEP
(status: 2008-05-09)
Comments:None

Carbon Monoxide Measurements
Not available.

Fig.: Overview of available measurements (daily data)

Surroundings 10 km

Median altitude: 126 (m) a.s.l. Standard deviation of altitude: 38 (m)
Site Altitude: 137 (m) a.s.l. Terrain below site: 66.3 (%)
Total population: 67596 Standard deviation of population: 69
Mean population density: 202 (km-2) Standard deviation of population density: 5 (km-2)
Local population density: 203.9 (km-2)
Dominating Land Cover Types:
Cultivated and managed areas (16) 89.7 (%)
Artificial surfaces and associated areas (22) 6.8 (%)
Herbaceous Cover, closed-open (13) 1.9 (%)
Mosaic: Cropland / Tree Cover / Other natural vegetation (17) 1.6 (%)
 
Mean O3 deposition velocity: 0.94 (cm s-1) Standard deviation of O3 deposition velocity: 0.19 (cm s-1)
Fig.: Topography Fig.: Population
 
Fig.: Land Cover

Surroundings 50 km

Median altitude: 96 (m) a.s.l. Standard deviation of altitude: 37 (m)
Site Altitude: 137 (m) a.s.l. Terrain below site: 65.3 (%)
Total population:2457018 Standard deviation of population: 4687
Mean population density: 298 (km-2) Standard deviation of population density: 350 (km-2)
Local population density: 203.9 (km-2)
Dominating Land Cover Types:
Cultivated and managed areas (16) 71.2 (%)
Herbaceous Cover, closed-open (13) 14.8 (%)
Artificial surfaces and associated areas (22) 6.8 (%)
Mosaic: Cropland / Shrub or Grass Cover (18) 3.4 (%)
 
Mean O3 deposition velocity: 0.89 (cm s-1) Standard deviation of O3 deposition velocity: 0.21 (cm s-1)
Fig.: Topography Fig.: Population
 
Fig.: Land Cover

12 hour Catchment Area

Mean radius: 157 (km) Standard deviation radius: 31 (km)
Equivalent radius: 161 (km) Circularity: 0.61
Total area: 81074 (km2) Total residence time: 18.0 (%)
Maximal radius: 198 (km) Minimal radius: 105 (km)
Maximal radius direction:W Minimal radius direction:SE
Average population density: 325 (km-2) Standard deviation of population density: 539 (km-2)
 
Dominating Land Cover Types:
Cultivated and managed areas (16) 57.0 (%)
Herbaceous Cover, closed-open (13) 20.0 (%)
Artificial surfaces and associated areas (22) 7.9 (%)
Water Bodies (natural & artificial) (20) 5.6 (%)
 
Average O3 deposition velocity: 0.81 (cm s-1) Standard deviation of O3 deposition velocity: 0.21 (cm s-1)
Catchment area derived from:FLEXPART nest
Fig.: Surface Footprint and Catchment Area , EuropeFig.: Surface Footprint Catchment Area , North Atlantic Region

24 hour Catchment Area

Mean radius: 308 (km) Standard deviation radius: 65 (km)
Equivalent radius: 313 (km) Circularity: 0.37
Total area:308637 (km2) Total residence time: 30.1 (%)
Maximal radius: 399 (km) Minimal radius: 202 (km)
Maximal radius direction:SW Minimal radius direction:SE
Average population density: 256 (km-2) Standard deviation of population density: 492 (km-2)
 
Dominating Land Cover Types:
Cultivated and managed areas (16) 40.9 (%)
Water Bodies (natural & artificial) (20) 25.2 (%)
Herbaceous Cover, closed-open (13) 19.1 (%)
Artificial surfaces and associated areas (22) 6.3 (%)
 
Average O3 deposition velocity: 0.64 (cm s-1) Standard deviation of O3 deposition velocity: 0.35 (cm s-1)
Catchment area derived from:FLEXPART nest
Fig.: Surface Footprint and Catchment Area , EuropeFig.: Surface Footprint Catchment Area , North Atlantic Region

48 hour Catchment Area

Mean radius: 481 (km) Standard deviation radius: 103 (km)
Equivalent radius: 493 (km) Circularity: 0.33
Total area:763672 (km2) Total residence time: 44.9 (%)
Maximal radius: 658 (km) Minimal radius: 309 (km)
Maximal radius direction:SW Minimal radius direction:SE
Average population density: 199 (km-2) Standard deviation of population density: 440 (km-2)
 
Dominating Land Cover Types:
Water Bodies (natural & artificial) (20) 37.2 (%)
Cultivated and managed areas (16) 31.1 (%)
Herbaceous Cover, closed-open (13) 17.6 (%)
Mosaic: Cropland / Shrub or Grass Cover (18) 5.4 (%)
 
Average O3 deposition velocity: 0.54 (cm s-1) Standard deviation of O3 deposition velocity: 0.38 (cm s-1)
Catchment area derived from:FLEXPART nest
Fig.: Surface Footprint and Catchment Area , EuropeFig.: Surface Footprint Catchment Area , North Atlantic Region


Please contact Stephan Henne in case of any questions.