Tropospheric Aircraft Ozone Data
(More detail at http://www.esrl.noaa.gov/gmd/ozwv/aircraft/aircraft.html)


 ************ USE OF ESRL GMD DATA ****************
These data are made freely available to the public and the
scientific community in the belief that their wide dissemination
will lead to greater understanding and new scientific insights.
The availability of these data does not constitute publication
of the data.  NOAA relies on the ethics and integrity of the user to
assure that ESRL receives fair credit for their work.
Manuscripts using the ESRL data should be sent to ESRL
for review before they are submitted for publication so we can
insure that the quality and limitations of the data are accurately
represented.

Every effort is made to produce the most accurate and precise
measurements possible.

Contact:

    Constituent: O3, T, RH
    Audra McClure-Begley
    tel: (303) 497-6823
    email: Audra.McClure@noaa.gov

***About the ozone monitors***
Aircrafts are equipped with 2B Technology modified ozone monitors (Model 205DB) and have inlets in
various locations on each plane. Temperature and RH probes are made by Vaisala and
are not calibrated at NOAA. GPS units are made by Garmin and used with factory
settings. All times in these files are GMT times, not local times.

***Data Quality***
Our QA/QC process includes manual inspection of the data and removal of what appear
to be instrument misreads. Then the data is smoothed with a one-minute boxcar average.


***File Format***
Each data file has an associated PostScript plot file (site_o3_date.ps). Every
file has a header, which includes pilot notes (regarding weather, flight plan
changes, etc...) if there are any. The header lines are denoted with #.
The remainder of the file is data and columns are delimited by whitespace (the
last # line being the column header). Missing data is denoted by "-999".

Stn    Date(UTC) Time(UTC)  O3(ppb)  RH(%)   T(C)
     Lat          Lon          Alt(masl)   Flag

A brief explanation of the columns of data is as follows.

Stn = NOAA and sometimes WMO station identifiers

Date (UTC) = Universal Date

Time (UTC) = Universal Time in military format hh:mm:ss. Files are not in local time.

O3(ppb) = Ozone in parts per billion with an accuracy of accuracy of 1 ppbv or 2% of
 reading). Measured with Vaisala HMP Model 330.

RH(%)   = 0-100% - This field will read "-999" if the probe is not plugged in or the
values drop below 0 or exceed 100. Sensor accuracy is
Accuracy at +20 °C (68 °F) ± 1.0 % RH (0 ... 90 % RH) , ± 1.7 % RH (90 ... 100 % RH).
Measured with Vaisala HMP Model 330.

T (C) = Range is -40 ... +80 °C. If reading is outside this range, data will show "-999".
A "-999" can also mean that the temperature humidity probe was not plugged in.

Lat, Lon = Converted to Decimal Degrees. Measured with Garmin GPS unit.

Alt (masl) = Altitude recorded in meters above sea level (masl). Measured with Garmin
 GPS Unit. The altitude may be estimated by using altitudes on either side of the missing
 point or with an geopotential height approximation.

Flag = If a flag appears, the data was questionable or approximated.
Some temperature probes appear to have a lag on descent on some flights, perhaps due
to the increased speed of descent or the relative angle of the probe.
Because of the difficulty in calculating this, the temperature data
has not been modified, but is generally flagged with a "T".

The data is released with the following flags due to any uncertainties
G - estimated altitude, latitude and/or longitude
I - questionable due to instrument cell temperature or pressure
B - questionable due to low battery
T - questionable temperature value

***Tropospheric Aircraft Ozone Measurement Program site locations and measurement
collection dates. *Ozone measurement data is available during active site dates.
Code
 Name
 Latitude
 Longitude
 Elevation (meters)
 Date of Active Site* (month/year)
 Country

AAO
 Airborne Aerosol Observing, Bondville, Illinois
 40.05
 -88.37
 230.0
 1/2006-1/2010
 United States

BGI
 Bradgate, Iowa
 42.82
 -94.41
 355.1
 6/2005-11/2005
 United States

BNE
 Beaver Crossing, Nebraska
 40.80
 -97.18
 465.9
 1/2005-1/2011
 United States

CAR
 Briggsdale, Colorado
 40.37
 -104.30
 1740.0
 3/2004-current
 United States

CMA
 Cape May, New Jersey
 38.83
 -74.32
 0.0
 8/2005-current
 United States

ESP
 Estevan Point, British Columbia
 49.58
 -126.37
 7.0
 3/2009-current
 Canada

FWI
 Fairchild, Wisconsin
 44.66
 -90.96
 334.3
 7/2005-11/2005
 United States

HIL
 Homer, Illinois
 40.07
 -87.91
 201.5
 9/2005-current
 United States

NHA
 Worcester, Massachusetts
 42.95
 -70.63
 0.0
 5/2005-current
 United States

OIL
 Oglesby, Illinois
 41.28
 -88.94
 192.6
 9/2005-10/2005
 United States

SCA
 Charleston, South Carolina
 32.77
 -79.55
 0.0
 10/2005-current
 United States

SGP (IAP)
 Southern Great Plains, Oklahoma
 36.80
 -97.50
 314.0
 6/2006-current
 United States

THD
 Trinidad Head, California
 41.05
 -124.15
 107.0
 4/2005-current
 United States

ULB
 Ulaanbaatar
 47.40
 106.00
 1350.0
 11/2004-10/2008
 Mongolia

WBI/RIA
 West Branch, Iowa/Rowley, Iowa
 41.73/42.40
 -91.35/-91.84
 241.7/298.7
 1/2005-5/2011
 United States