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Alert Nunavut (82o28'N, 62o30'W)
The Alert observatory is located on the northeastern tip of Ellesmere Island in the Canadian Arctic. Alert is also the site of a military station (CFS Alert) and an Environment Canada Upper Air Weather Station. The Observatory is situated 210 m above sea level; 6 km SSW of CFS Alert. The terrain in the vicinity is comprised of steeply rolling hills, with peaks between 100 to 150 m high and frequent deep ravines and high cliffs.
Alert is far removed from the major industrial regions in the Northern Hemisphere and therefore ideally situated for monitoring changes in global atmospheric pollutants.
The Dr. Neil Trivett Global Atmosphere Watch (GAW) Observatory at Alert, Nunavut
The greenhouse gas measurement program began at Alert in 1975 with a simple flask sampling program to assess the concentration of carbon dioxide in the arctic atmosphere. Over time, other measurements were established until, in 1986, Canada's first research station for the continuous monitoring of greenhouse gases and aerosols was opened. Many collaborative international sampling programs for greenhouse and other trace gases are also conducted at Alert. The Alert station also serves as one of the three international greenhouse gas intercomparison sites. These intercomparison activities provide an on-going assessment for network comparability amongst agencies conducting similar greenhouse measurement programs at other locations around the globe. Alert is the most northerly site in the World Meteorological Organization’s (WMO) Global Atmosphere Watch (GAW) Network.
|Measurement||Sampling Frequency||Sampling Record|
|Carbon Dioxide (CO2)||Weekly Flask||1975 - Present|
|Carbon Dioxide (CO2)||Hourly||1988 - Present|
|Methane (CH4)||Hourly||1988 - Present|
|Chlorofluorocarbons (CFC-11 and CFC-12)||Hourly||1995 - 2009|
|Carbon Monoxide (CO)||Hourly||1998 - Present|
|Hydrogen (H2)||Hourly||1998 - 2002|
|CO2, CH4, CO, N2O, SF6, H2, 13C and 18O in CO2||Weekly Flask||1998 - Present|
|Sulphur hexafluoride (SF6)||Hourly||2000 - 2006|
|Nitrous Oxide (N2O)||Hourly||2000 - 2006|
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