High-time resolution measurements of primary marine organic sea spray physico-chemical properties reveal submicron organic marine aerosol plume concentrations peaking at 3.8 mu g m-3, moreover, it shows an apparent dichotomous behavior of marine organics in terms of water uptake: specifically sea-spray aerosol enriched in organic matter possesses a low Hydroscopic Growth Factor (HGF similar to 1.25) while simultaneously having a cloud condensation nucleus/condensation nuclei (CCN/CN) activation efficiency of between 83% at 0.25% supersaturation and 100% at 0.75%. Simultaneous retrieval of Cloud Droplet Number Concentration (CDNC) during primary organic aerosol plumes reveals CDNC concentrations of 350 cm(-3) for organic mass concentrations 3-4 mu g m(-3). It is demonstrated that the retrieved high CDNCs under clean marine conditions can only be explained by organic sea-spray and corroborates the high CCN activation efficiency associated with primary organics. It is postulated that marine hydrogels are responsible for this dichotomous behavior
A dual behavior of primary marine organics
Rinaldi;Facchini;
2013
Abstract
High-time resolution measurements of primary marine organic sea spray physico-chemical properties reveal submicron organic marine aerosol plume concentrations peaking at 3.8 mu g m-3, moreover, it shows an apparent dichotomous behavior of marine organics in terms of water uptake: specifically sea-spray aerosol enriched in organic matter possesses a low Hydroscopic Growth Factor (HGF similar to 1.25) while simultaneously having a cloud condensation nucleus/condensation nuclei (CCN/CN) activation efficiency of between 83% at 0.25% supersaturation and 100% at 0.75%. Simultaneous retrieval of Cloud Droplet Number Concentration (CDNC) during primary organic aerosol plumes reveals CDNC concentrations of 350 cm(-3) for organic mass concentrations 3-4 mu g m(-3). It is demonstrated that the retrieved high CDNCs under clean marine conditions can only be explained by organic sea-spray and corroborates the high CCN activation efficiency associated with primary organics. It is postulated that marine hydrogels are responsible for this dichotomous behaviorI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
