Influence of lower stratosphere/upper troposphere transport events on surface ozone at the Everest-Pyramid GAW Station (Nepal): first year of analysis

In this work, we present the first systematic identification of episodes of air mass transport from the lower stratosphere/upper troposphere (LS/UT) in the middle troposphere of the southern Himalayas. For this purpose, we developed an algorithm to detect LS/UT transport events on a daily basis at the Everest-Pyramid GAW station (EV-PYR, 5079 m a.s.l., Nepal). In particular, in situ surface ozone and atmospheric pressure variations as well as total ozone values from OMI satellite measurements have been analysed. Further insight is gained from three-dimensional backward trajectories and potential vorticity calculated with the LAGRANTO model. According to the algorithm outputs, 9.0% of the considered data set (365 days from March 2006 to February 2007) was influenced by this class of phenomena with a maximum of frequency during dry and pre-monsoon seasons. During 25 days of LS/UT transport events for which any influence of anthropogenic pollution was excluded, the daily ozone mixing ratio increased by 9.3% compared to the seasonal values. This indicates that under favourable conditions, downward air mass transport from the LS/UT can play a considerable role in determining the concentrations of surface ozone in the southern Himalayas.

Citation proposal
Paolo Cristofanelli (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Paolo Bonasoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Angela Marinoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Ubaldo Bonafè (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Francescopiero Calzolari (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Rocco Duchi (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Angela Marinoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Fabrizio Roccato (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Elisa Vuillermoz (Ev-K2-CNR) - Michael Sprenger (Institute for Atmospheric and Climate Science) (2009) . Influence of lower stratosphere/upper troposphere transport events on surface ozone at the Everest-Pyramid GAW Station (Nepal): first year of analysis. Taylor & Francis Group https://geoportal.mountaingenius.org/geonetwork/srv/api/records/5bd74fe1-6d98-426d-b9d3-2941e99a1158

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File identifier: 5bd74fe1-6d98-426d-b9d3-2941e99a1158 XML

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Metadata language: eng

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Climatology, meteorology, atmosphere
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Keywords ( Theme )

lower stratosphere transport , upper troposphere transport , Ozone , surface ozone

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GAW , SHARE

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Nepal , Everest

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LAGRANTO model

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Date ( Publication ): 2009-07-29T00:00:00

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"Influence of lower stratosphere/upper troposphere transport events on surface ozone at the Everest-Pyramid GAW Station (Nepal): first year of analysis".

International Journal of Remote Sensing

Volume 30, Issue 15-16, 2009

Cristofanelli, P., Bonasoni, P., Bonafè, U., Calzolari, F., Duchi, R., Marinoni, A., Roccato, F., Vuillermoz, E., Sprenger, M.

Special Issue: 1989–2009 Remote Sensing and the Implementation of the Montreal Protocol.