Fast fourier synoptic mapping of UARS data

Fabrizio Sassi*, Murry Salby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Fast Fourier synoptic mapping (FFSM) is used to develop an operational algorithm for mapping dynamical and chemical structure from UARS observations. The operational algorithm (1) utilizes contemporaneous measurements from different UARS instruments observing the same field property, (2) accounts for measurement error from those instruments, and (3) treats data voids that follow from operational considerations such as duty cycle, power failure, and the satellite's routine yaw maneuver. The incoherent component of space-time variability, which includes instrument noise and random sampling error, is evaluated from the asynoptic measurements and rejected during the mapping procedure. Consolidating measurements from different instruments and interpolating low-frequency components of the space-time spectrum across gaps enable synoptic structure to be mapped continuously over durations of several months. Time series of synoptic maps reveal Kelvin wave activity radiating away from its convective source region in the western Pacific, localized transfers of ozone between the tropics and extratropics, and diurnal variations resolved by the UARS sampling. Dynamical and chemical structure mapped via FFSM is validated by intercomparison of chemical tracers and compared to archived grids mapped via Kalman filtering.

Original languageEnglish
Pages (from-to)10885-10898
Number of pages14
JournalJournal of Geophysical Research
Issue numberD9
Publication statusPublished - 1998
Externally publishedYes


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