Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

A global model tool for three-dimensional multiyear stratospheric chemistry simulations : Model description and first results

Rummukainen, Markku LU orcid ; Isaksen, Ivar S.A. ; Rognerud, Bjørg and Stordal, Frode (1999) In Journal of Geophysical Research Atmospheres 104(D21). p.26437-26456
Abstract

The paper presents a new global modeling tool, Stratospheric Chemical Transport Model 2. It has been developed for effective three-dimensional multiyear stratospheric chemistry studies, featuring an extensive chemistry scheme, heterogeneous processing on sulfate aerosols, and some polar stratospheric cloud processes. The transport algorithm maintains sub-grid-scale distributions and connects vertically the stratospheric layers, even in a coarse vertical grid. The model has been integrated for 49 months, recycling 1 year of precalculated transport from a middle atmosphere general circulation model. One year of daily National Centers for Environmental Prediction global analyses are used as temperatures. Diurnal cycles of photolysis rates... (More)

The paper presents a new global modeling tool, Stratospheric Chemical Transport Model 2. It has been developed for effective three-dimensional multiyear stratospheric chemistry studies, featuring an extensive chemistry scheme, heterogeneous processing on sulfate aerosols, and some polar stratospheric cloud processes. The transport algorithm maintains sub-grid-scale distributions and connects vertically the stratospheric layers, even in a coarse vertical grid. The model has been integrated for 49 months, recycling 1 year of precalculated transport from a middle atmosphere general circulation model. One year of daily National Centers for Environmental Prediction global analyses are used as temperatures. Diurnal cycles of photolysis rates are recalculated every 7 days to give interaction with ozone changes. The model is able to describe most of the geographical and seasonal ozone variability and the meridional distributions of ozone, reactive nitrogen, chlorine, and bromine. Stratospheric diurnal cycles for nitrogen, hydrogen, chlorine, and bromine species are captured in detail. The upper stratosphere ozone deficiency, typical to models, is large. Its sensitivity to different ways of tuning are explored. Midlatitude, rather than polar, wintertime processes have so far been the focus in this model tool. The present transport and grid resolution are not suited for realistic simulations at high latitudes. As there is only a limited inclusion of polar stratospheric cloud (PSC) microphysics, chemical processing in the cold polar lower stratosphere also cannot be well simulated. For example, the Antarctic ozone hole is not simulated, but the modeled chemistry should be suitable for warm Arctic winters when type II PSCs and particle sedimentation do not occur.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
publishing date
type
Contribution to journal
publication status
published
in
Journal of Geophysical Research Atmospheres
volume
104
issue
D21
pages
20 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:0033589465
ISSN
0148-0227
DOI
10.1029/1999JD900407
language
English
LU publication?
no
id
557dc85d-2edf-4515-93ef-f8d02130df3c
date added to LUP
2025-09-30 18:51:04
date last changed
2025-10-14 09:02:36
@article{557dc85d-2edf-4515-93ef-f8d02130df3c,
  abstract     = {{<p>The paper presents a new global modeling tool, Stratospheric Chemical Transport Model 2. It has been developed for effective three-dimensional multiyear stratospheric chemistry studies, featuring an extensive chemistry scheme, heterogeneous processing on sulfate aerosols, and some polar stratospheric cloud processes. The transport algorithm maintains sub-grid-scale distributions and connects vertically the stratospheric layers, even in a coarse vertical grid. The model has been integrated for 49 months, recycling 1 year of precalculated transport from a middle atmosphere general circulation model. One year of daily National Centers for Environmental Prediction global analyses are used as temperatures. Diurnal cycles of photolysis rates are recalculated every 7 days to give interaction with ozone changes. The model is able to describe most of the geographical and seasonal ozone variability and the meridional distributions of ozone, reactive nitrogen, chlorine, and bromine. Stratospheric diurnal cycles for nitrogen, hydrogen, chlorine, and bromine species are captured in detail. The upper stratosphere ozone deficiency, typical to models, is large. Its sensitivity to different ways of tuning are explored. Midlatitude, rather than polar, wintertime processes have so far been the focus in this model tool. The present transport and grid resolution are not suited for realistic simulations at high latitudes. As there is only a limited inclusion of polar stratospheric cloud (PSC) microphysics, chemical processing in the cold polar lower stratosphere also cannot be well simulated. For example, the Antarctic ozone hole is not simulated, but the modeled chemistry should be suitable for warm Arctic winters when type II PSCs and particle sedimentation do not occur.</p>}},
  author       = {{Rummukainen, Markku and Isaksen, Ivar S.A. and Rognerud, Bjørg and Stordal, Frode}},
  issn         = {{0148-0227}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{D21}},
  pages        = {{26437--26456}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Journal of Geophysical Research Atmospheres}},
  title        = {{A global model tool for three-dimensional multiyear stratospheric chemistry simulations : Model description and first results}},
  url          = {{http://dx.doi.org/10.1029/1999JD900407}},
  doi          = {{10.1029/1999JD900407}},
  volume       = {{104}},
  year         = {{1999}},
}