Observations of Ice Nucleating Particles Over Southern Ocean Waters
| Autor: | Thomas C. J. Hill, Sonia M. Kreidenweis, A. M. Rauker, Ruhi S Humphries, Paul B. Krummel, Alastair G. Williams, W. Ponsonby, Alain Protat, Zoe Loh, Paul J. DeMott, J. Ward, Christina S. McCluskey, Melita Keywood, Peter G. Strutton, Sébastien Moreau, Scott D. Chambers, James Harnwell, Ian M. McRobert |
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| Rok vydání: | 2018 |
| Předmět: |
education.field_of_study
010504 meteorology & atmospheric sciences Population 010501 environmental sciences Atmospheric sciences Sea spray 01 natural sciences Aerosol Boundary layer Geophysics Arctic 13. Climate action Ice nucleus General Earth and Planetary Sciences Environmental science Seawater 14. Life underwater education 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 45 |
| ISSN: | 1944-8007 0094-8276 |
| DOI: | 10.1029/2018gl079981 |
| Popis: | A likely important feature of the poorly understood aerosol‐cloud interactions over the Southern Ocean (SO) is the dominant role of sea spray aerosol, versus terrestrial aerosol. Ice nucleating particles (INPs), or particles required for heterogeneous ice nucleation, present over the SO have not been studied in several decades. In this study, boundary layer aerosol properties and immersion freezing INP number concentrations (nINPs) were measured during a ship campaign that occurred south of Australia (down to 53 °S) in March‐April 2016. Ocean surface chlorophyll‐a concentrations ranged from 0.11‐1.77 mg m‐3 and nINPs were a factor of 100 lower than historical surveys, ranging from 0.38 to 4.6 m‐3 at ‐20 °C. The INP population included organic heat‐stable material, with contributions from heat‐labile material. Lower INP source potentials of SO seawater samples compared to Arctic seawater were consistent with lower ice nucleating site densities in this study compared to north Atlantic air masses. |
| Databáze: | OpenAIRE |
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