The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS)
In this study we examine the simulated downward transport and mixing of stratospheric air into the upper tropical troposphere as observed on a research flight during the SCOUT-O3 campaign in connection with a deep convective system. We use the Advanced Research Weather and Research Forecasting (WRF-...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-06-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/6467/2015/acp-15-6467-2015.pdf |
| _version_ | 1819175564216369152 |
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| author | W. Frey R. Schofield P. Hoor D. Kunkel F. Ravegnani A. Ulanovsky S. Viciani F. D'Amato T. P. Lane |
| author_facet | W. Frey R. Schofield P. Hoor D. Kunkel F. Ravegnani A. Ulanovsky S. Viciani F. D'Amato T. P. Lane |
| author_sort | W. Frey |
| collection | DOAJ |
| description | In this study we examine the simulated downward transport and mixing of
stratospheric air into the upper tropical troposphere as observed on a
research flight during the SCOUT-O3 campaign in connection with a deep
convective system. We use the Advanced Research Weather and Research
Forecasting (WRF-ARW) model with a horizontal resolution of 333 m to examine
this downward transport. The simulation reproduces the deep convective
system, its timing and overshooting altitudes reasonably well compared to
radar and aircraft observations. Passive tracers initialised at pre-storm
times indicate the downward transport of air from the stratosphere to the
upper troposphere as well as upward transport from the boundary layer into
the cloud anvils and overshooting tops. For example, a passive ozone tracer
(i.e. a tracer not undergoing chemical processing) shows an enhancement in
the upper troposphere of up to about 30 ppbv locally in the cloud, while the
in situ measurements show an increase of 50 ppbv. However, the passive
carbon monoxide tracer exhibits an increase, while the observations show a
decrease of about 10 ppbv, indicative of an erroneous model representation
of the transport processes in the tropical tropopause layer. Furthermore, it
could point to insufficient entrainment and detrainment in the model. The
simulation shows a general moistening of air in the lower stratosphere, but
it also exhibits local dehydration features. Here we use the model to explain
the processes causing the transport and also expose areas of inconsistencies
between the model and observations. |
| first_indexed | 2024-12-22T20:56:52Z |
| format | Article |
| id | doaj.art-ecb933fb568a49d1b6de0918ae83ff61 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-22T20:56:52Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-ecb933fb568a49d1b6de0918ae83ff612022-12-21T18:12:56ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-06-0115116467648610.5194/acp-15-6467-2015The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS)W. Frey0R. Schofield1P. Hoor2D. Kunkel3F. Ravegnani4A. Ulanovsky5S. Viciani6F. D'Amato7T. P. Lane8School of Earth Sciences and ARC Centre of Excellence for Climate System Science, University of Melbourne, Melbourne, AustraliaSchool of Earth Sciences and ARC Centre of Excellence for Climate System Science, University of Melbourne, Melbourne, AustraliaInstitute for Atmospheric Physics, Johannes Gutenberg University, Mainz, GermanyInstitute for Atmospheric Physics, Johannes Gutenberg University, Mainz, GermanyInstitute of Atmospheric Sciences and Climate, ISAC-CNR, Bologna, ItalyCentral Aerological Observatory, Dolgoprudny, Moscow Region, RussiaCNR-INO National Institute of Optics, Florence, ItalyCNR-INO National Institute of Optics, Florence, ItalySchool of Earth Sciences and ARC Centre of Excellence for Climate System Science, University of Melbourne, Melbourne, AustraliaIn this study we examine the simulated downward transport and mixing of stratospheric air into the upper tropical troposphere as observed on a research flight during the SCOUT-O3 campaign in connection with a deep convective system. We use the Advanced Research Weather and Research Forecasting (WRF-ARW) model with a horizontal resolution of 333 m to examine this downward transport. The simulation reproduces the deep convective system, its timing and overshooting altitudes reasonably well compared to radar and aircraft observations. Passive tracers initialised at pre-storm times indicate the downward transport of air from the stratosphere to the upper troposphere as well as upward transport from the boundary layer into the cloud anvils and overshooting tops. For example, a passive ozone tracer (i.e. a tracer not undergoing chemical processing) shows an enhancement in the upper troposphere of up to about 30 ppbv locally in the cloud, while the in situ measurements show an increase of 50 ppbv. However, the passive carbon monoxide tracer exhibits an increase, while the observations show a decrease of about 10 ppbv, indicative of an erroneous model representation of the transport processes in the tropical tropopause layer. Furthermore, it could point to insufficient entrainment and detrainment in the model. The simulation shows a general moistening of air in the lower stratosphere, but it also exhibits local dehydration features. Here we use the model to explain the processes causing the transport and also expose areas of inconsistencies between the model and observations.http://www.atmos-chem-phys.net/15/6467/2015/acp-15-6467-2015.pdf |
| spellingShingle | W. Frey R. Schofield P. Hoor D. Kunkel F. Ravegnani A. Ulanovsky S. Viciani F. D'Amato T. P. Lane The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) Atmospheric Chemistry and Physics |
| title | The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) |
| title_full | The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) |
| title_fullStr | The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) |
| title_full_unstemmed | The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) |
| title_short | The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS) |
| title_sort | impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere lower stratosphere utls |
| url | http://www.atmos-chem-phys.net/15/6467/2015/acp-15-6467-2015.pdf |
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