On seasonality of stratomesospheric CO above midlatitudes: New insight from solar FTIR spectrometry at Zugspitze and Garmisch

Details On seasonality of stratomesospheric CO above midlatitudes: New insight from solar FTIR spectrometry at Zugspitze and Garmisch On seasonality of stratomesospheric CO above midlatitudes: New insight from solar FTIR spectrometry at Zugspitze and Garmisch

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621804b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 21, CiteID L21804

Physics

Geophysics

4

Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Mesospheric Dynamics, Mathematical Geophysics: Inverse Theory, Global Change: Remote Sensing (1855)

Scientific paper

A significant seasonality in stratomesospheric CO (24-100 km) above mid-latitudes is derived from FTIR via a new regularization scheme. Half hourly means from the Zugspitze (47.42°N, 10.98°E, 2964 m a.s.l.) and nearby Garmisch (745 m a.s.l.) measurements show excellent agreement (R = 0.94, slope 0.91, standard deviation 12%). Mean seasonality of the Zugspitze series (1999-2008) shows a November-April enhancement (February maximum 3.63 × 1016 cm-2) and a summer background (1.64 × 1016 cm-2) which agrees with the WACCM model. Measured monthly means reveal a year-to-year variability of up to 32% (1-sigma) in winter not reproduced by WACCM (R = -0.13). Frequency distributions of daily means are right skewed in winter due to enhancements by vortex air transport (1-3 days duration) which typically reflect CO levels of the vortex border and may even reach vortex-center levels (≈300% of the multi-annual monthly median).

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