Aerosol water parameterization: long-term evaluation and importance for climate studies
<p>We scrutinize the importance of aerosol water for the aerosol optical depth (AOD) calculations using a long-term evaluation of the EQuilibrium Simplified Aerosol Model v4 for climate modeling. EQSAM4clim is based on a single solute coefficient approach that efficiently parameterizes hyg...
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doaj-739f2bc8d408401db030f5542ca744562020-11-24T21:45:56ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-11-0118167471677410.5194/acp-18-16747-2018Aerosol water parameterization: long-term evaluation and importance for climate studiesS. Metzger0S. Metzger1S. Metzger2M. Abdelkader3M. Abdelkader4M. Abdelkader5B. Steil6K. Klingmüller7Energy, Environment and Water Research Center, The Cyprus Institute, Nicosia, CyprusAir Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germanynow at: ResearchConcepts io GmbH, Freiburg im Breisgau, GermanyEnergy, Environment and Water Research Center, The Cyprus Institute, Nicosia, CyprusAir Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germanynow at: King Abdullah University of Science and Technology, Thuwal, Saudi ArabiaAir Chemistry Department, Max Planck Institute for Chemistry, Mainz, GermanyAir Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany<p>We scrutinize the importance of aerosol water for the aerosol optical depth (AOD) calculations using a long-term evaluation of the EQuilibrium Simplified Aerosol Model v4 for climate modeling. EQSAM4clim is based on a single solute coefficient approach that efficiently parameterizes hygroscopic growth, accounting for aerosol water uptake from the deliquescence relative humidity up to supersaturation. EQSAM4clim extends the single solute coefficient approach to treat water uptake of multicomponent mixtures. The gas–aerosol partitioning and the mixed-solution water uptake can be solved analytically, preventing the need for iterations, which is computationally efficient. EQSAM4clim has been implemented in the global chemistry climate model EMAC and compared to ISORROPIA II on climate timescales. Our global modeling results show that (I) our EMAC results of the AOD are comparable to modeling results that have been independently evaluated for the period 2000–2010, (II) the results of various aerosol properties of EQSAM4clim and ISORROPIA II are similar and in agreement with AERONET and EMEP observations for the period 2000–2013, and (III) the underlying assumptions on the aerosol water uptake limitations are important for derived AOD calculations. Sensitivity studies of different levels of chemical aging and associated water uptake show larger effects on AOD calculations for the year 2005 compared to the differences associated with the application of the two gas–liquid–solid partitioning schemes. Overall, our study demonstrates the importance of aerosol water for climate studies.</p>https://www.atmos-chem-phys.net/18/16747/2018/acp-18-16747-2018.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
S. Metzger S. Metzger S. Metzger M. Abdelkader M. Abdelkader M. Abdelkader B. Steil K. Klingmüller |
spellingShingle |
S. Metzger S. Metzger S. Metzger M. Abdelkader M. Abdelkader M. Abdelkader B. Steil K. Klingmüller Aerosol water parameterization: long-term evaluation and importance for climate studies Atmospheric Chemistry and Physics |
author_facet |
S. Metzger S. Metzger S. Metzger M. Abdelkader M. Abdelkader M. Abdelkader B. Steil K. Klingmüller |
author_sort |
S. Metzger |
title |
Aerosol water parameterization: long-term evaluation and importance for climate studies |
title_short |
Aerosol water parameterization: long-term evaluation and importance for climate studies |
title_full |
Aerosol water parameterization: long-term evaluation and importance for climate studies |
title_fullStr |
Aerosol water parameterization: long-term evaluation and importance for climate studies |
title_full_unstemmed |
Aerosol water parameterization: long-term evaluation and importance for climate studies |
title_sort |
aerosol water parameterization: long-term evaluation and importance for climate studies |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2018-11-01 |
description |
<p>We scrutinize the importance of aerosol water for the aerosol optical depth
(AOD) calculations using a long-term evaluation of the EQuilibrium
Simplified Aerosol Model v4 for climate modeling. EQSAM4clim is
based on a single solute coefficient approach that efficiently parameterizes
hygroscopic growth, accounting for aerosol water uptake from the
deliquescence relative humidity up to supersaturation. EQSAM4clim extends the
single solute coefficient approach to treat water uptake of multicomponent
mixtures. The gas–aerosol partitioning and the mixed-solution water uptake
can be solved analytically, preventing the need for iterations, which is
computationally efficient. EQSAM4clim has been implemented in the global
chemistry climate model EMAC and compared to ISORROPIA II on climate
timescales. Our global modeling results show that (I) our EMAC results of the
AOD are comparable to modeling results that have been independently evaluated
for the period 2000–2010, (II) the results of various aerosol properties of
EQSAM4clim and ISORROPIA II are similar and in agreement with AERONET and
EMEP observations for the period 2000–2013, and (III) the underlying
assumptions on the aerosol water uptake limitations are important for derived
AOD calculations. Sensitivity studies of different levels of chemical aging
and associated water uptake show larger effects on AOD calculations for the
year 2005 compared to the differences associated with the application of the
two gas–liquid–solid partitioning schemes. Overall, our study demonstrates
the importance of aerosol water for climate studies.</p> |
url |
https://www.atmos-chem-phys.net/18/16747/2018/acp-18-16747-2018.pdf |
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