The Canadian Arctic Validation of ACE campaign made validation measurements for the ACE satellite mission in the Canadian Arctic from February to April 2004.  A suite of 6 instruments was used to determine total columns (and vertical profiles, where possible) of the 14 ACE baseline target species, atmospheric extinction, temperature, and pressure.  Spectral, as well as trace gas, measurements from ground-based versions of ACE-FTS and MAESTRO instruments will help to assess the quality of both the Level 1 and Level 2 ACE data under the chemically perturbed conditions found in the springtime Arctic.  Daily measurements were made during the campaign.  These high temporal resolution results will give to give context to the sparse (in time and space) ACE occultation measurements

The campaign "re-opened" the AStrO facility for two months of observations during Arctic spring in 2004 (when the perturbed stratospheric conditions can lead to chemical ozone loss) .  A combination of on-site instrumentation and instruments deployed for the campaign were used to make the atmospheric measurements.  The campaign was split into two phases:  the intensive and extensive phases.  The intensive phase took place from February 21 – March 10.  During this time, measuremnets were made by all instruments and daily ozonesonde flights were launched.  The extensive phase continued from March 10 – April 15 with measurements by the DA8 FTIR, the grating UV-Vis spectrometer and weekly ozonesonde flights.

Latitude of occultations within 1000 km of Eureka, Nunavut