Unusual appearance of mother‐of‐pearl clouds above El Calafate, Argentina (50°21′S, 72°16′W).

Autor:	Dörnbrack, Andreas, Kaifler, Bernd, Kaifler, Natalie, Rapp, Markus, Wildmann, Norman, Garhammer, Markus, Ohlmann, Klaus, Payne, James M., Sandercock, Morgan, Austin, Elizabeth J.
Předmět:	MOTHER-of-pearl POLAR vortex MOUNTAIN wave HYDROSTATIC equilibrium WATER vapor COLD (Temperature) DYNAMIC viscosity
Zdroj:	Weather (00431656); Dec2020, Vol. 75 Issue 12, p378-388, 11p
Abstrakt:	Unusual appearance of mother-of-pearl clouds above El Calafate, Argentina (50°21'S, 72°16'W) Visual observations from the ground and from a glider soaring in the lowermost stratosphere revealed the existence of stratospheric mother-of-pearl clouds above El Calafate in the lee of the Andes on 11 September 2019. By using high-resolution numerical simulations, we show evidence of mountain waves propagating up to the stratosphere that are responsible for generating the localised cold stratospheric temperature anomalies required for ice cloud formation. Gl Mountain wave-induced temperature anomalies Operational HRES analyses of the EMCWF's Integrated Forecast System (IFS) are used to visualise the hemispheric temperature field at 20hPa (~25km altitude) on 11 September 2019 at 1800 utc and 12 September 2019 at 0000 utc, Figure 9. [Extracted from the article]
Databáze:	Complementary Index
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