Ground-based measurements on aerosol particles at Paphos, Cyprus, in March-April 2017
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2019
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| _version_ | 1867168572422225920 |
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| author | Gong, Xianda Wex, Heike Müller, Thomas Wiedensohler, Alfred Höhler, Kristina Kandler, Konrad Ma, Nan Dietel, Barbara Schiebel, Thea Möhler, Ottmar Stratmann, Frank |
| author_facet | Gong, Xianda Wex, Heike Müller, Thomas Wiedensohler, Alfred Höhler, Kristina Kandler, Konrad Ma, Nan Dietel, Barbara Schiebel, Thea Möhler, Ottmar Stratmann, Frank |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | As part of the A-LIFE (Absorbing aerosol layers in a changing climate: aging, lifetime and dynamics) campaign, ground-based measurements were carried out in Paphos, Cyprus, for characterizing the abundance, properties and sources of aerosol particles in general, and cloud condensation nuclei (CCN) and ice nucleating particles (INP), in particular. New particle formation (NPF) events with subsequent growth of the particles into the CCN size range were observed. Aitken mode particles featured κ values of 0.21 to 0.29, indicating the presence of organic materials. Accumulation mode particles featured a higher hygroscopicity parameter, with a median κ value of 0.57, suggesting the presence of sulfate, and maybe sea salt particles mixed with organic carbon. A clear downward trend of κ with increasing supersaturation and decreasing dcrit was found. Super-micron particles originated mainly from sea spray aerosol (SSA) and partly from mineral dust. INP concentrations (NINP) were measured in the temperature range from −6.5 to −26.5 ℃, using two freezing array type instruments. NINP at a particular temperature span around 1 order of magnitude below −20 ℃, and about 2 orders of magnitude at warmer temperatures (T> −18 ℃). Few samples showed elevated concentrations at temperatures > −15 ℃, which suggests a significant contribution of biological particles to the INP population, which possibly could originate from Cyprus. Both measured temperature spectra and NINP probability density functions (PDFs) indicate that the observed INP (ice active in the temperature range between −15 and −20 ℃) mainly originate from long-range transport. There was no correlation between NINP and particle number concentration in the size range >500 nm (N>500nm). Parameterizations based on N>500nm were found to overestimate NINP by about 1 to 2 orders of magnitude. There was also no correlation between NINP and particle surface area concentration. The ice active surface site density (ns) for the polluted aerosol encountered in the eastern Mediterranean in this study is about 1 to 3 orders of magnitude lower than the ns found for dust aerosol particles in previous studies. This suggests that observed NINP-PDFs as those derived here could be a better choice for modelling NINP if the aerosol particle composition is unknown or uncertain. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_904758 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Ground-based measurements on aerosol particles at Paphos, Cyprus, in March-April 2017 Gong, Xianda Wex, Heike Müller, Thomas Wiedensohler, Alfred Höhler, Kristina Kandler, Konrad Ma, Nan Dietel, Barbara Schiebel, Thea Möhler, Ottmar Stratmann, Frank Absorbing aerosol layers in a changing climate: aging, lifetime and dynamics; A-LIFE; cloud condensation nuclei; Cyprus; Ice Nucleating Particles; Paphos_ALife As part of the A-LIFE (Absorbing aerosol layers in a changing climate: aging, lifetime and dynamics) campaign, ground-based measurements were carried out in Paphos, Cyprus, for characterizing the abundance, properties and sources of aerosol particles in general, and cloud condensation nuclei (CCN) and ice nucleating particles (INP), in particular. New particle formation (NPF) events with subsequent growth of the particles into the CCN size range were observed. Aitken mode particles featured κ values of 0.21 to 0.29, indicating the presence of organic materials. Accumulation mode particles featured a higher hygroscopicity parameter, with a median κ value of 0.57, suggesting the presence of sulfate, and maybe sea salt particles mixed with organic carbon. A clear downward trend of κ with increasing supersaturation and decreasing dcrit was found. Super-micron particles originated mainly from sea spray aerosol (SSA) and partly from mineral dust. INP concentrations (NINP) were measured in the temperature range from −6.5 to −26.5 ℃, using two freezing array type instruments. NINP at a particular temperature span around 1 order of magnitude below −20 ℃, and about 2 orders of magnitude at warmer temperatures (T> −18 ℃). Few samples showed elevated concentrations at temperatures > −15 ℃, which suggests a significant contribution of biological particles to the INP population, which possibly could originate from Cyprus. Both measured temperature spectra and NINP probability density functions (PDFs) indicate that the observed INP (ice active in the temperature range between −15 and −20 ℃) mainly originate from long-range transport. There was no correlation between NINP and particle number concentration in the size range >500 nm (N>500nm). Parameterizations based on N>500nm were found to overestimate NINP by about 1 to 2 orders of magnitude. There was also no correlation between NINP and particle surface area concentration. The ice active surface site density (ns) for the polluted aerosol encountered in the eastern Mediterranean in this study is about 1 to 3 orders of magnitude lower than the ns found for dust aerosol particles in previous studies. This suggests that observed NINP-PDFs as those derived here could be a better choice for modelling NINP if the aerosol particle composition is unknown or uncertain. |
| title | Ground-based measurements on aerosol particles at Paphos, Cyprus, in March-April 2017 |
| topic | Absorbing aerosol layers in a changing climate: aging, lifetime and dynamics; A-LIFE; cloud condensation nuclei; Cyprus; Ice Nucleating Particles; Paphos_ALife |
| url | https://doi.org/10.1594/PANGAEA.904758 |