The Canadian Arctic Validation of ACE 2006 campaign is making validation
measurements for the ACE satellite mission in the Canadian Arctic from
February to April. A suite of 10 instruments is used to
determine total columns (and vertical profiles and partial columns, 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 (PARIS-IR) and ACE-MAESTRO (MAESTRO-G) instruments will
assist in assessing the quality of both the Level 1 and Level 2 ACE data under the
chemically perturbed conditions found in the springtime Arctic. Daily measurements are
being 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 is taking place at the Polar Environment Atmospheric Research Laboratory (PEARL)
facility at Eureka, Nunavut. Six weeks of observations are being made during Arctic spring
in 2006. This is a time when the perturbed stratospheric conditions can lead to chemical ozone
loss. A combination of on-site instrumentation (ozone lidar (DIAL) and high resolution
Fourier transform infrared spectrometer (DA8 FTIR)) and instruments deployed for the campaign
(UV/visible spectrometers and Fourier transform infrared spectrometer) are used to make the
atmospheric measurements. The campaign is split into two phases: the intensive
and extensive phases. The intensive phase takes place from February 21 – March 9.
During this time, measurements are made by all instruments and daily ozonesonde flights were
launched. The extensive phase continues from March 10 – April 1 with measurements
by the DA8 FTIR, several of the grating UV-Vis spectrometers and weekly ozonesonde flights.
Latitude of occultations
within 500 km of Eureka, Nunavut