Abstract:
The National Oceanic and Atmospheric Administration's (NOAA) Climate
Monitoring and Diagnostics Laboratory (CMDL) has collected
chlorofluorocarbon (CFC) and nitrous oxide (N2O) from flask samples
and in situ instruments located at monitoring stations. The
Halocarbons and other Trace Species Group (HATS) of NOAA/CMDL collects
measurements for a standard suite of Radiatively Important Trace
Species
... (RITS): CFC-12, CFC-11, CFC-113
(1,1,2-trichlorotrifluoroethane), methyl chloroform (MC), carbon
tetrachloride (CT) and nitrous oxide (N2O). NOAA/CMDL/HATS stations
are at Point Barrow, Alaska (BRW); Mauna Loa, Hawaii (MLO); Cape
Matatula, American Samoa (SMO); and, South Pole, Antarctica
(SPO). Cooperative stations are at Niwot Ridge, Colorado (NWT); Alert,
Canada (ALT); and Cape Grim, Australia (CGO). Starting in 1977, paired
samples were collected each week in electropolished stainless steel
flasks at the four NOAA/CMDL/HATS sites and Niwot Ridge. After 1980,
flask pairs at South Pole were collected once a week. Collection of
flask pairs at Alert bagan in 1988 and at Cape Grim in 1991. All
flasks were shipped back to NOAA/CMDL in Boulder, CO for analysis by
electron capture gas chromatography (EC-GC). In 1987 the flask sample
program was complemented by automated in situ measurements at the four
NOAA/CMDL/HATS sites and Niwot Ridge.
Principal investigators for the CFC-11 and CFC-12 in situ and flask
measurements are:
J. Elkins, T. Thompson, and J. Butler (NOAA/CMDL)
Principal investigators for the CFC-113 flask measurements are:
S. Montzaka, J. Elkins, and J. Butler (NOAA/CMDL)
The NOAA/CMDL data are available via anonymous ftp as follows:
ftp://ftp.cmdl.noaa.gov/hats/
or
ftp://ftp.cmdl.noaa.gov/hats/cfcs
ftp://ftp.cmdl.noaa.gov/hats/n2o
The following datasets are currently available via ftp:
Monthly in situ CFC-11 data from BRW, MLO, NWR, SMO and SPO.
Hourly in situ CFC-11 data from BRW, MLO, NWR, SMO and SPO.
Daily in situ CFC-11 data from BRW, MLO, NWR, SMO and SPO.
Monthly global flask CFC-11 data.
Monthly flask pairs CFC-11 data from ALT, BRW, CGO, MLO, NWR, SMO, and SPO.
Monthly in situ CFC-12 data from BRW, MLO, NWR, SMO and SPO.
Hourly in situ CFC-12 data from BRW, MLO, NWR, SMO and SPO.
Daily in situ CFC-12 data from BRW, MLO, NWR, SMO and SPO.
Monthly global flask CFC-12 data.
Monthly flask pairs CFC-12 data from ALT, BRW, CGO, MLO, NWR, SMO, and SPO.
Monthly flask pairs CFC-113 data from ALT, BRW, NWR, MLO, SMO, CGO,
and SPO.
Monthly global N2O data.
For more information on the NOAA/CMDL/HATS program see:
http://www.cmdl.noaa.gov/hats/
A subset of this data is available from the Carbon Dioxide Information
Analysis Center (CDIAC) as part of the Trends collection.
http://cdiac.esd.ornl.gov 
