Annual cycle of ozone at and above the tropical tropopause: observations versus simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS)

By P. Konopka, J. Grooß, G. Günther, F. Ploeger, R. Pommrich, R. Müller, N. Livesey. 2009

139 citations recorded by the source corpus.

Abstract. Multi-annual simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) were conducted to study the seasonality of O3 within the stratospheric part of the tropical tropopause layer (TTL), i.e. above θ=360 K potential temperature level. In agreement with satellite (HALOE) and in-situ observations (SHADOZ), CLaMS simulations show a pronounced annual cycle in O3, at and above θ=380 K, with the highest mixing ratios in the late boreal summer. Within the model, this cycle is driven by the seasonality of both upwelling and in-mixing. The latter process occurs through enhanced horizontal transport from the extratropics into the TTL that is mainly driven by the meridional, isentropic winds. The strongest in-mixing occurs during the late boreal summer from the Northern Hemisphere in the potential temperature range between 370 and 420 K. Complementary, the strongest upwelling occurs in winter reducing O3 to the lowest values in early spring. Both CLaMS simulations and Aura MLS O3 observations consistently show that enhanced in-mixing in summer is mainly driven by the Asian monsoon anticyclone.

Subfields: Atmospheric Science, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/30af98ef7339dfc2de3c804f7b136ba9fee6bda5

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atmospheric Science

1. William J. Randel
2. M. Hegglin
3. Piers M. Forster
4. L. Pan
5. Andrew Gettelman
6. T. Birner
7. P. Hoor
8. P. Konopka

In Global and Planetary Change

1. William J. Randel
2. M. Hegglin
3. L. Pan
4. Piers M. Forster
5. Andrew Gettelman
6. P. Hoor
7. T. Birner
8. P. Konopka

Citations in the corpus

• Impact of uncertainties in atmospheric mixing on simulated UTLS composition and related radiative effects (2012, methodology): “At the edge of this anticyclone, extratropical stratospheric air is transported equatorwards, significantly affecting trace gas budgets (e. g., ozone) in the upper part of the TTL [e.g., Konopka et al., 2010].”
• THE EXTRATROPICAL UPPER TROPOSPHERE AND LOWER STRATOSPHERE (2011, background): “The circulation upstream and downstream of the anticyclone also contributes to quasi‐horizontal transport between the tropics and extratropics [Dunkerton, 1995; Konopka et al., 2010].”