Validation of line-of-sight winds from ACE-FTS solar occultation measurements.

The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measures infrared transmittance spectra of the atmosphere from low Earth orbit using the Sun as a light source (solar occultation). Doppler shifts of gas-phase lines in the measured spectra can be used to determine line-of-sight winds. These line-of-sight winds are a new data product for version 5.2 of ACE-FTS processing. The winds are validated through comparison with independent horizontal wind observations from meteor radars and from the ICON-MIGHTI satellite instrument. ACE-FTS winds show a ∼15 m/s offset, opposite in sign for the two different ACE-FTS observation geometries (sunrise and sunset). • ACE-FTS version 5.2 data product is now available and includes line-of-sight winds. • ACE solar occultation measurements can be used to derive line-of-sight winds by observing the Doppler shift on various molecular transitions. • ACE line-of-sight winds were compared against MIGHTI and meteor radar wind data. • Average wind speeds as a function of altitude show that there is a small shift in calculated winds between ACE and MIGHTI/Meteor radar. [ABSTRACT FROM AUTHOR]