Data & Products
Missions & Sensors
The Atmospheric Chemistry Experiment (ACE) is a Canadian satellite mission for remote sensing of the Earth's atmosphere that was launched into a high-inclination (74°), circular low-earth (650 km from the surface) orbit on August 13, 2003. This orbit gives SCISAT-1 coverage of tropical, mid-latitude, and polar regions, allowing it to study a range of atmospheric processes.
The scientific goals for the ACE mission include:
The primary instrument on SCISAT-1 is the ACE-FTS,
a high spectral resolution infrared Fourier Transform Spectrometer (FTS). SCISAT-1
also features a UV-visible-NIR spectrophotometer known as MAESTRO.
Working primarily in solar
occultation mode, the satellite provides altitude profile information (typically
10-100 km) for temperature, pressure, and the volume mixing ratios (VMRs) of
dozens of molecules of atmospheric interest, as well as atmospheric extinction
profiles over the latitudes 85°N to 85°S.
The ACE-FTS mission concept is based on the ATMOS (Atmospheric Trace MOlecule Spectroscopy) instrument that NASA flew four times (1985, 1992, 1993, and 1994) on the Space Shuttle but the ACE-FTS has been miniaturized by nearly a factor of 10 in mass, power, and volume as compared to ATMOS. With fewer than 400 occultations, ATMOS has made and continues to make valuable contributions to atmospheric science. The ACE-FTS will measure well over 20,000 occultations over its mission lifetime and is augmented by measurements from the two imagers and MAESTRO.
Level 0: Interferograms
Level 1: Spectra
Level 2: Temperature, Pressure and Volume Mixing Ratio (VMR) profiles as a function of altitude
NO2 and O3 profiles are retrieved from the UV spectrometer at
the measurement tangent altitudes and interpolated at the regular tangent height
Access to the current Level 2 ACE data (version 2.2) is only available to ACE Science Team members and other authorized users but version 1.0 is available via the Public Dataset page.
ACE Public Datasets - ACE-FTS Level 2 Data
If you would like to know more about ACE, see the following points of contact: