[Elektronische Resource]

Variability of residence time in the Tropical Tropopause Layer during Northern Hemisphere winter / K. Krüger; S. Tegtmeier and M. Rex

Krüger, Kirstin ; Tegtmeier, S. ; Rex, M.

graph. Darst

The residence time TLCP-400 K, being the duration time of air parcels in the layer between the Lagrangian Cold Point (LCP) and 400 K, varies spatially and is longer (>50 days) over the maritime continent as the LCP is lowest there (<370 K). Comparing three theta layers within the TTL reveals the vertical dependence of ?. We derive a mean duration time of 34 days for 360380 K (lower TTL), 38 days for 380400 K (upper TTL) and 70 days for 360400 K theta layers for the 19622001 period. A case analysis reveals that T is positively skewed for 360380 K and 380400 K during La Niña and El Niño Southern Oscillation (ENSO) neutral years. For these cases, ~60% of air parcels travel from 360 K to 380 K within 25 days. There is large interannual variability for T varying up to ±20% from the long-term mean, with strongest variability seen in the lower part of the TTL. Statistical analysis reveals a significant anti-correlation between the residence time and the extratropical and subtropical wave driving in the lowermost stratosphere.

In: Atmospheric chemistry and physics / European Geosciences Union. - Katlenburg-Lindau : EGU, 2001- , ISSN: 1680-7324 , ZDB-ID: 2069847-1

. - Bd. 9.2009, 18, Seite 6717-6725

 

 

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