Modeling dust as component minerals in the Community Atmosphere Model: development of framework and impact on radiative forcing
Abstract
The mineralogy of desert dust is important due to its effect on radiation, clouds and biogeochemical cycling of trace nutrients. This study presents the simulation of dust radiative forcing as a function of both mineral composition and size at the global scale, using mineral soil maps for estimating emissions. Externally mixed mineral aerosols in the bulk aerosol module in the Community Atmosphere Model version 4 (CAM4) and internally mixed mineral aerosols in the modal aerosol module in the Community Atmosphere Model version 5.1 (CAM5) embedded in the Community Earth System Model version 1.0.5 (CESM) are speciated into common mineral components in place of total dust. The simulations with mineralogy are compared to available observations of mineral atmospheric distribution and deposition along with observations of clear-sky radiative forcing efficiency. Based on these simulations, we estimate the all-sky direct radiative forcing at the top of the atmosphere as + 0.05 Wm⁻² for both CAM4 and CAM5 simulations with mineralogy. We compare this to the radiative forcing from simulations of dust in release versions of CAM4 and CAM5 (+0.08 and +0.17 Wm⁻²) and of dust with optimized optical properties, wet scavenging and particle size distribution in CAM4 and CAM5, -0.05 and -0.17 Wm⁻²,more »
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE; USDOE Atmospheric Systems Research and Climate Modeling Programs
- OSTI Identifier:
- 1230072
- Alternate Identifier(s):
- OSTI ID: 1173023
- Report Number(s):
- PNNL-SA-107496
Journal ID: ISSN 1680-7324
- Grant/Contract Number:
- SC00006735; SC0006735; AC05-76RL01830; 0932946; 1003509
- Resource Type:
- Published Article
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 15 Journal Issue: 1; Journal ID: ISSN 1680-7324
- Publisher:
- Copernicus Publications, EGU
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Scanza, R. A., Mahowald, N., Ghan, S., Zender, C. S., Kok, J. F., Liu, X., Zhang, Y., and Albani, S. Modeling dust as component minerals in the Community Atmosphere Model: development of framework and impact on radiative forcing. Germany: N. p., 2015.
Web. doi:10.5194/acp-15-537-2015.
Scanza, R. A., Mahowald, N., Ghan, S., Zender, C. S., Kok, J. F., Liu, X., Zhang, Y., & Albani, S. Modeling dust as component minerals in the Community Atmosphere Model: development of framework and impact on radiative forcing. Germany. https://doi.org/10.5194/acp-15-537-2015
Scanza, R. A., Mahowald, N., Ghan, S., Zender, C. S., Kok, J. F., Liu, X., Zhang, Y., and Albani, S. Thu .
"Modeling dust as component minerals in the Community Atmosphere Model: development of framework and impact on radiative forcing". Germany. https://doi.org/10.5194/acp-15-537-2015.
@article{osti_1230072,
title = {Modeling dust as component minerals in the Community Atmosphere Model: development of framework and impact on radiative forcing},
author = {Scanza, R. A. and Mahowald, N. and Ghan, S. and Zender, C. S. and Kok, J. F. and Liu, X. and Zhang, Y. and Albani, S.},
abstractNote = {The mineralogy of desert dust is important due to its effect on radiation, clouds and biogeochemical cycling of trace nutrients. This study presents the simulation of dust radiative forcing as a function of both mineral composition and size at the global scale, using mineral soil maps for estimating emissions. Externally mixed mineral aerosols in the bulk aerosol module in the Community Atmosphere Model version 4 (CAM4) and internally mixed mineral aerosols in the modal aerosol module in the Community Atmosphere Model version 5.1 (CAM5) embedded in the Community Earth System Model version 1.0.5 (CESM) are speciated into common mineral components in place of total dust. The simulations with mineralogy are compared to available observations of mineral atmospheric distribution and deposition along with observations of clear-sky radiative forcing efficiency. Based on these simulations, we estimate the all-sky direct radiative forcing at the top of the atmosphere as + 0.05 Wm⁻² for both CAM4 and CAM5 simulations with mineralogy. We compare this to the radiative forcing from simulations of dust in release versions of CAM4 and CAM5 (+0.08 and +0.17 Wm⁻²) and of dust with optimized optical properties, wet scavenging and particle size distribution in CAM4 and CAM5, -0.05 and -0.17 Wm⁻², respectively. The ability to correctly include the mineralogy of dust in climate models is hindered by its spatial and temporal variability as well as insufficient global in situ observations, incomplete and uncertain source mineralogies and the uncertainties associated with data retrieved from remote sensing methods.},
doi = {10.5194/acp-15-537-2015},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 1,
volume = 15,
place = {Germany},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}
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https://doi.org/10.5194/acp-15-537-2015
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