Global distribution of the effective aerosol hygroscopicity parameter for CCN activation

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • KJ Pringle
  • H Tost
  • A Pozzer
  • U Poeschl
  • J Lelieveld
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000278744400002&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-10-5241-2010
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: 610PA
ISSN
1680-7316
Ausgabe der Veröffentlichung
12
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
5241 - 5255
Datum der Veröffentlichung
2010
Status
Published
Titel
Global distribution of the effective aerosol hygroscopicity parameter for CCN activation
Sub types
  • Article
Ausgabe der Zeitschrift
10

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. In this study we use the ECHAM/MESSy Atmospheric Chemistry (EMAC) model to simulate global fields of the effective hygroscopicity parameter κ which approximately describes the influence of chemical composition on the cloud condensation nucleus (CCN) activity of aerosol particles. The obtained global mean values of κ at the Earth's surface are 0.27±0.21 for continental and 0.72±0.24 for marine regions (arithmetic mean ± standard deviation). These values are the internally mixed κ calculated across the Aitken and accumulation modes. The mean κ values are in good agreement with previous estimates based on observational data, but the model standard deviation for continental regions is higher. Over the continents, the regional distribution appears fairly uniform, with κ values mostly in the range of 0.1–0.4. Lower values over large arid regions and regions of high organic loading lead to reduced continental average values for Africa and South America (0.15–0.17) compared to the other continents (0.21–0.36). Marine regions show greater variability with κ values ranging from 0.9–1.0 in remote regions to 0.4–0.6 in continental outflow regions where the highly hygroscopic sea spray aerosol mixes with less hygroscopic continental aerosol. Marine κ values as low as 0.2–0.3 are simulated in the outflow from the Sahara desert. At the top of the planetary boundary layer the κ values can deviate substantially from those at the surface (up to 30%) – especially in marine and coastal regions. In moving from the surface to the height of the planetary boundary layer, the global average marine κ value reduces by 20%. Thus, surface observations may not always be representative for the altitudes where cloud formation mostly occurs. In a pre-industrial model scenario, the κ values tend to be higher over marine regions and lower over the continents, because the anthropogenic particulate matter is on average less hygroscopic than sea-spray but more hygroscopic than the natural continental background aerosol (dust and organic matter). In regions influenced by desert dust the particle hygroscopicity has increased strongly as the mixing of air pollutants with mineral particles typically enhances the κ values by a factor of 2–3 above the initial value of ≈0.005.</jats:p>
Autoren
  • KJ Pringle
  • H Tost
  • A Pozzer
  • U Pöschl
  • J Lelieveld
DOI
10.5194/acp-10-5241-2010
eISSN
1680-7324
Ausgabe der Veröffentlichung
12
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2010
Paginierung
5241 - 5255
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-10-5241-2010
Datum der Datenerfassung
2024
Titel
Global distribution of the effective aerosol hygroscopicity parameter for CCN activation
Ausgabe der Zeitschrift
10

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