2024-03-29T06:11:02Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1750692021-01-18T11:33:12Zcom_10261_5062com_10261_5col_10261_5064
DIGITAL.CSIC
author
Boose, Yvonne
author
Sierau, Berko
author
García, M. Isabel
author
Rodríguez, Sergio
author
Alastuey, Andrés
author
Linke, Claudia
author
Schnaiter, Martin
author
Kupiszewski, Piotr
author
Kanji, Zamin A.
author
Lohmann, Ulrike
funder
European Research Council
orcid
Alastuey, Andrés [0000-0002-5453-5495]
2019-02-01T07:21:20Z
2019-02-01T07:21:20Z
2016-06-25
Atmospheric Chemistry and Physics 16(14): 9067-9087 (2016)
http://hdl.handle.net/10261/175069
10.5194/acp-16-9067-2016
http://dx.doi.org/10.13039/501100000781
This study aims at quantifying the ice nucleation properties of desert dust in the Saharan Air Layer (SAL), the warm, dry and dust-laden layer that expands from North Africa to the Americas. By measuring close to the dust's emission source, before aging processes during the transatlantic advection potentially modify the dust properties, the study fills a gap between in situ measurements of dust ice nucleating particles (INPs) far away from the Sahara and laboratory studies of ground-collected soil. Two months of online INP concentration measurements are presented, which were part of the two CALIMA campaigns at the Izaña observatory in Tenerife, Spain (2373ma.s.l.), in the summers of 2013 and 2014. INP concentrations were measured in the deposition and condensation mode at temperatures between 233 and 253K with the Portable Ice Nucleation Chamber (PINC). Additional aerosol information such as bulk chemical composition, concentration of fluorescent biological particles as well as the particle size distribution was used to investigate observed variations in the INP concentration. The concentration of INPs was found to range between 0.2stdL'1 in the deposition mode and up to 2500stdL'1 in the condensation mode at 240K. It correlates well with the abundance of aluminum, iron, magnesium and manganese R: 0.43-0.67) and less with that of calcium, sodium or carbonate. These observations are consistent with earlier results from laboratory studies which showed a higher ice nucleation efficiency of certain feldspar and clay minerals compared to other types of mineral dust. We find that an increase of ammonium sulfate, linked to anthropogenic emissions in upwind distant anthropogenic sources, mixed with the desert dust has a small positive effect on the condensation mode INP per dust mass ratio but no effect on the deposition mode INP. Furthermore, the relative abundance of biological particles was found to be significantly higher in INPs compared to the ambient aerosol. Overall, this suggests that atmospheric aging processes in the SAL can lead to an increase in ice nucleation ability of mineral dust from the Sahara. INP concentrations predicted with two common parameterization schemes, which were derived mostly from atmospheric measurements far away from the Sahara but influenced by Asian and Saharan dust, were found to be higher based on the aerosol load than we observed in the SAL, further suggesting aging effects of INPs in the SAL. © Author(s) 2016.
eng
openAccess
Aerosols
Nucleation
Ice
Particle size
Dust
Ice nucleating particles in the Saharan Air Layer
artículo
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URL
https://digital.csic.es/bitstream/10261/175069/1/Ice%20nucleating%20particles%20in%20the%20Saharan%20Air%20Layer.pdf
File
MD5
58ff0d1c93522618cf163306a041716a
2953125
application/pdf
Ice nucleating particles in the Saharan Air Layer.pdf