Impact of mineral dust on cloud formation in a Saharan outflow region
We present a numerical modelling study investigating the impact of mineral dust on cloud formation over the Eastern Mediterranean for two case studies: (i) 25 September 2008 and (ii) 28/29 January 2003. In both cases dust plumes crossed the Mediterranean and interacted with clouds forming along fron...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/12/11383/2012/acp-12-11383-2012.pdf |
| _version_ | 1818840844183011328 |
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| author | L. Smoydzin A. Teller H. Tost M. Fnais J. Lelieveld |
| author_facet | L. Smoydzin A. Teller H. Tost M. Fnais J. Lelieveld |
| author_sort | L. Smoydzin |
| collection | DOAJ |
| description | We present a numerical modelling study investigating the impact of mineral dust on cloud formation over the Eastern Mediterranean for two case studies: (i) 25 September 2008 and (ii) 28/29 January 2003. In both cases dust plumes crossed the Mediterranean and interacted with clouds forming along frontal systems. For our investigation we used the fully online coupled model WRF-chem. <br><br> The results show that increased aerosol concentrations due to the presence of mineral dust can enhance the formation of ice crystals. This leads to slight shifts of the spatial and temporal precipitation patterns compared to scenarios where dust was not considered to act as ice nuclei. However, the total amount of precipitation did not change significantly. The only exception occurred when dust entered into an area of orographic ascent, causing glaciation of the clouds, leading to a local enhancement of rainfall. The impact of dust particles acting as giant cloud condensation nuclei on precipitation formation was found to be small. Based on our simulations the contribution of dust to the CCN population is potentially significant only for warm phase clouds. Nevertheless, the dust-induced differences in the microphysical structure of the clouds can contribute to a significant radiative forcing, which is important from a climate perspective. |
| first_indexed | 2024-12-19T04:16:38Z |
| format | Article |
| id | doaj.art-8794a21554e34fd3b9219afb92554760 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-19T04:16:38Z |
| publishDate | 2012-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-8794a21554e34fd3b9219afb925547602022-12-21T20:36:17ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242012-12-011223113831139310.5194/acp-12-11383-2012Impact of mineral dust on cloud formation in a Saharan outflow regionL. SmoydzinA. TellerH. TostM. FnaisJ. LelieveldWe present a numerical modelling study investigating the impact of mineral dust on cloud formation over the Eastern Mediterranean for two case studies: (i) 25 September 2008 and (ii) 28/29 January 2003. In both cases dust plumes crossed the Mediterranean and interacted with clouds forming along frontal systems. For our investigation we used the fully online coupled model WRF-chem. <br><br> The results show that increased aerosol concentrations due to the presence of mineral dust can enhance the formation of ice crystals. This leads to slight shifts of the spatial and temporal precipitation patterns compared to scenarios where dust was not considered to act as ice nuclei. However, the total amount of precipitation did not change significantly. The only exception occurred when dust entered into an area of orographic ascent, causing glaciation of the clouds, leading to a local enhancement of rainfall. The impact of dust particles acting as giant cloud condensation nuclei on precipitation formation was found to be small. Based on our simulations the contribution of dust to the CCN population is potentially significant only for warm phase clouds. Nevertheless, the dust-induced differences in the microphysical structure of the clouds can contribute to a significant radiative forcing, which is important from a climate perspective.http://www.atmos-chem-phys.net/12/11383/2012/acp-12-11383-2012.pdf |
| spellingShingle | L. Smoydzin A. Teller H. Tost M. Fnais J. Lelieveld Impact of mineral dust on cloud formation in a Saharan outflow region Atmospheric Chemistry and Physics |
| title | Impact of mineral dust on cloud formation in a Saharan outflow region |
| title_full | Impact of mineral dust on cloud formation in a Saharan outflow region |
| title_fullStr | Impact of mineral dust on cloud formation in a Saharan outflow region |
| title_full_unstemmed | Impact of mineral dust on cloud formation in a Saharan outflow region |
| title_short | Impact of mineral dust on cloud formation in a Saharan outflow region |
| title_sort | impact of mineral dust on cloud formation in a saharan outflow region |
| url | http://www.atmos-chem-phys.net/12/11383/2012/acp-12-11383-2012.pdf |
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