Laminae in the tropical middle stratosphere: Origin and age estimation

Details Laminae in the tropical middle stratosphere: Origin and age estimation Laminae in the tropical middle stratosphere: Origin and age estimation

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.4337j&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 23, p. 4337-4340

Physics

13

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Atmospheric Composition And Structure: Middle Atmosphere-Constituent Transport And Chemistry, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

In situ measurements of N2O and O3 aboard the Observations from the Middle Stratosphere (OMS) balloon payload in the tropics are presented. In November 1997 at 7°S very distinct laminated structures in the N2O profile were observed in contrast to earlier studies based solely on O3 profiles. The laminae probably are an observation of Rossby wave-breaking events that lead to transport of mid-latitude air into the tropics. Using a photochemical model of the ozone response within those air parcels, their residence time in the tropics is estimated to be 4 to 6 weeks. In February 1997 at 7°S a similar vertical profile of N2O revealed no mid-latitude laminae. We present dynamical arguments to support the existence of such laminae in November, but not in February.

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