Physics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3817803g&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 17, CiteID L17803
Physics
Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Atmosphere (0315, 0325), Global Change: Climate Dynamics (0429, 3309)
Scientific paper
Simultaneous, real-time measurements of atmospheric water vapor mixing ratio and isotopic composition (δD and δ18O) were obtained using cavity ringdown spectroscopy on the arid Chajnantor Plateau in the subtropical Chilean Andes (elevation 5080 m or 550 hPa; latitude 23°S) during July and August 2010. The measurements show surface water vapor mixing ratio as low as 215 ppmv, δD values as low as -540‰, and δ18O values as low as -68‰, which are the lowest atmospheric water vapor δ values reported from Earth's surface. The results are consistent with previous measurements from the base of the tropical tropopause layer (TTL) and suggest large-scale subsidence of air masses from the upper troposphere to the Earth's surface. The range of measurements is consistent with condensation under conditions of ice supersaturation and mixing with moister air from the lower troposphere that has been processed through shallow convection. Diagnostics using reanalysis data show that the extreme aridity of the Chajnantor Plateau is controlled by condensation in the upper tropical troposphere.
Galewsky Joseph
Rella Christopher
Samuels Kimberly
Sharp Zachary
Ward Dylan
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