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Reconsideration of the cause of dry air in the southern middle latitude stratosphere Public Deposited

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  • A previous comparison of data from the Halogen Occultation Experiment (HALOE) and of output from the NCAR Community Climate Model (CCM2) in austral spring overstated the effect of de­hydration in the southern polar vortex on lower strato­ spheric water vapor in part due to shortcomings in the HALOE retrieval algorithm and in part to remnants of the initially dry stratosphere in the CCM2 run. A new HALOE retrieval and a longer CCM2 run both show more water vapor than previously, but HALOE still shows less in the southern hemisphere than in the northern in September-October 1992. A "dried-air" tracer iri the CCM2 suggests that polar dehydration influences middle latitudes only below about 100 hPa, and seasonal variations of HALOE H2O imply no influence north of 50°S.
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  • Mote, P. W. (1995). Reconsideration of the cause of dry air in the southern middle latitude stratosphere. Geophysical Research Letters, 22(15), 2025-2028.
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  • 22
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  • 15
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  • National Environment Research Council through the UK Universities' Global Atmospheric Modelling Programme.
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