The First Year of AIM SOFIE Water Vapor in the Polar Mesosphere: Comparisons With HALOE and Model Expectations

Details The First Year of AIM SOFIE Water Vapor in the Polar Mesosphere: Comparisons With HALOE and Model Expectations The First Year of AIM SOFIE Water Vapor in the Polar Mesosphere: Comparisons With HALOE and Model Expectations

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa41d..08s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA41D-08

Mathematics

Logic

0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

Observations of mesospheric water vapor along with PMC properties by the SOFIE experiment on the AIM spacecraft have provided a means to quantify in detail the water/ice budget in the formation and evolution of PMCs. We will give an overview of the SOFIE water vapor measurements from the first year of the AIM mission, which encompasses one northern and one southern PMC season. These initial results from SOFIE confirm an enhancement of water vapor within the PMC layer that develops simultaneously with the PMC layer as in HALOE data, but there are several apparent differences between SOFIE water measurements and that expected based upon a 12 year climatological average of HALOE measurements. Differences of the layer s peak value and thickness, as seen in HALOE and SOFIE, persist throughout the PMC season. In monthly averages where the HALOE peak values typically exceeds 10 ppmv and occasionally reaches 13 ppmv during July and August, the SOFIE water rarely exceeds 8 ppmv. However, some of these differences are likely due to different SOFIE and HALOE observational sampling, signal to noise, and vertical resolution. Also, the SOFIE water measurement is insensitive to ice spectra. We will discuss these differences and current SOFIE water vapor validation efforts.

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