SPADE H2O measurements and the seasonal cycle of statospheric water vapor

Details SPADE H2O measurements and the seasonal cycle of statospheric water vapor SPADE H2O measurements and the seasonal cycle of statospheric water vapor

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2559h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 23, p. 2559-2562

Physics

37

Air Sampling, Annual Variations, Atmospheric Chemistry, Humidity Measurement, In Situ Measurement, Meteorology, Mixing Ratios, Nitrogen Oxides, Photochemical Reactions, Stratosphere, Water Vapor, Aerosols, Hygrometers, Lyman Alpha Radiation, Time Series Analysis, Vertical Distribution

Scientific paper

We present measurements of lower statospheric water vapor obtained during the Stratospheric Phototchemistry, Aerosols and Dynamics Expedition (SPADE) mission with a new high precision, fast response, Lyman-alpha hygrometer. The H2O data show a distinct seasonal cycle. For air that recently entered the statosphere, data collected during the fall show much more water vapor than data from the spring. Fast quasi-horizontal mixing causes compact relationships between water and N2O to be established on relatively short time scales. The measurements are consistent with horizontal mixing times of a few months or less. Vertical mixing appears to cause the seasonal variations in water vapor to propagate up to levels corresponding to air that has been in the stratosphere approximately one year.

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