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Title: Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin using the WRF-Chem v.3.9.1.1 coupled model

Abstract

The size distribution of atmospheric aerosols plays a key role for understanding and quantifying the uncertainties related to aerosol–radiation and aerosol–cloud interactions. These interactions ultimately depend on the size distribution through optical properties (such as aerosol optical depth, AOD) or cloud microphysical properties. Hence, the main objective of this contribution is to disentangle the impact of the representation of aerosol size distribution on aerosol optical properties over central Europe, particularly over the Mediterranean Basin, during a summertime aerosol episode. To fulfill this objective, a sensitivity test has been conducted using the coupled chemistry–meteorology model WRF-Chem (Weather Research Forecast model coupled with Chemistry). The test modified the parameters defining a lognormal size distribution (geometric diameter and standard deviation) by 10 %, 20 %, and 50 %. Results reveal that the reduction in the standard deviation of the accumulation mode leads to the largest impacts on AOD due to a transfer of particles from the accumulation mode to the coarse mode. A reduction in the geometric diameter of the accumulation mode also has an influence on AOD representation since particles in this mode are assumed to be smaller. In addition, an increase in the geometric diameter of the coarse mode produces amore » redistribution through the total size distribution by relocating particles from the finer modes to the coarse.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3]
  1. Univ. of Murcia (Spain)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of Murcia (Spain); Biomedical Research Inst., Murcia (Spain)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; Spanish Ministry of the Economy and Competitiveness; European Regional Development Fund
OSTI Identifier:
1735596
Report Number(s):
PNNL-SA-158300
Journal ID: ISSN 1991-9603
Grant/Contract Number:  
AC05-76RL01830; CGL2017-87921-R; EST18/00718
Resource Type:
Accepted Manuscript
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online); Journal Volume: 13; Journal Issue: 12; Journal ID: ISSN 1991-9603
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Palacios-Peña, Laura, Fast, Jerome D., Pravia-Sarabia, Enrique, and Jiménez-Guerrero, Pedro. Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin using the WRF-Chem v.3.9.1.1 coupled model. United States: N. p., 2020. Web. https://doi.org/10.5194/gmd-13-5897-2020.
Palacios-Peña, Laura, Fast, Jerome D., Pravia-Sarabia, Enrique, & Jiménez-Guerrero, Pedro. Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin using the WRF-Chem v.3.9.1.1 coupled model. United States. https://doi.org/10.5194/gmd-13-5897-2020
Palacios-Peña, Laura, Fast, Jerome D., Pravia-Sarabia, Enrique, and Jiménez-Guerrero, Pedro. Mon . "Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin using the WRF-Chem v.3.9.1.1 coupled model". United States. https://doi.org/10.5194/gmd-13-5897-2020. https://www.osti.gov/servlets/purl/1735596.
@article{osti_1735596,
title = {Sensitivity of aerosol optical properties to the aerosol size distribution over central Europe and the Mediterranean Basin using the WRF-Chem v.3.9.1.1 coupled model},
author = {Palacios-Peña, Laura and Fast, Jerome D. and Pravia-Sarabia, Enrique and Jiménez-Guerrero, Pedro},
abstractNote = {The size distribution of atmospheric aerosols plays a key role for understanding and quantifying the uncertainties related to aerosol–radiation and aerosol–cloud interactions. These interactions ultimately depend on the size distribution through optical properties (such as aerosol optical depth, AOD) or cloud microphysical properties. Hence, the main objective of this contribution is to disentangle the impact of the representation of aerosol size distribution on aerosol optical properties over central Europe, particularly over the Mediterranean Basin, during a summertime aerosol episode. To fulfill this objective, a sensitivity test has been conducted using the coupled chemistry–meteorology model WRF-Chem (Weather Research Forecast model coupled with Chemistry). The test modified the parameters defining a lognormal size distribution (geometric diameter and standard deviation) by 10 %, 20 %, and 50 %. Results reveal that the reduction in the standard deviation of the accumulation mode leads to the largest impacts on AOD due to a transfer of particles from the accumulation mode to the coarse mode. A reduction in the geometric diameter of the accumulation mode also has an influence on AOD representation since particles in this mode are assumed to be smaller. In addition, an increase in the geometric diameter of the coarse mode produces a redistribution through the total size distribution by relocating particles from the finer modes to the coarse.},
doi = {10.5194/gmd-13-5897-2020},
journal = {Geoscientific Model Development (Online)},
number = 12,
volume = 13,
place = {United States},
year = {2020},
month = {11}
}

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