English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Particle water (liquidwater content, LWC) and aerosol pH are important parameters of the aerosolphase, affecting heterogeneous chemistry and bioavailability of nutrientsthat profoundly impact cloud formation, atmospheric composition, andatmospheric fluxes of nutrients to ecosystems. Few measurements of in situLWC and pH, however, exist in the published literature. Using concurrentmeasurements of aerosol chemical composition, cloud condensation nucleiactivity, and tandem light scattering coefficients, the particle water massconcentrations associated with the aerosol inorganic (Winorg) andorganic (Worg) components are determined for measurements conductedat the Finokalia atmospheric observation station in the eastern Mediterraneanbetween June and November 2012. These data are interpreted using theISORROPIA-II thermodynamic model to predict the pH of aerosols originatingfrom the various sources that influence air quality in the region. Onaverage, closure between predicted aerosol water and that determined bycomparison of ambient with dry light scattering coefficients was achieved towithin 8 % (slope  =  0.92, R2  =  0.8, n  =  5201 points).Based on the scattering measurements, a parameterization is also derived,capable of reproducing the hygroscopic growth factor (f(RH)) within15 % of the measured values. The highest aerosol water concentrations areobserved during nighttime, when relative humidity is highest and the collapseof the boundary layer increases the aerosol concentration. A significantdiurnal variability is found for Worg with morning and afternoonaverage mass concentrations being 10–15 times lower than nighttimeconcentrations, thus rendering Winorg the main form of particlewater during daytime. The average value of total aerosol water was2.19 ± 1.75 µg m−3, contributing on average up to33 % of the total submicron mass concentration. Average aerosol waterassociated with organics, Worg, was equal to0.56 ± 0.37 µg m−3; thus, organics contributed about27.5 % to the total aerosol water, mostly during early morning, lateevening, and nighttime hours.The aerosol was found to be highly acidic with calculated aerosol pH varyingfrom 0.5 to 2.8 throughout the study period. Biomass burning aerosolpresented the highest values of pH in the submicron fraction and the lowestvalues in total water mass concentration. The low pH values observed in thesubmicron mode and independently of air mass origin could increasenutrient availability and especially P solubility, which is the nutrientlimiting sea water productivity of the eastern Mediterranean

Particle water and pH in the eastern Mediterranean: source variability and implications for nutrient availability