نتایج جستجو برای: hygroscopicity
تعداد نتایج: 787 فیلتر نتایج به سال:
A large fraction of atmospheric organic aerosol (OA) originates from natural emissions that are oxidized in the atmosphere to form secondary organic aerosol (SOA). Isoprene (IP) and monoterpenes (MT) are the most important precursors of SOA originating from forests. The climate impacts from OA are currently estimated through parameterizations of water uptake that drastically simplify the comple...
This work focuses on the interaction of water vapor with ionic liquids (ILs) consisting of [CnMIM] + (n = 2, 4, or 6) cations paired with Cl− or BF4 − anions to examine the effect of alkyl chain length on IL hygroscopicity. Tandem nanodifferential mobility analysis (TDMA) and attenuated total reflectance-Fourier transform infrared (ATRFTIR) spectroscopy were used to study IL nanoparticles and t...
Aerosols influence climate by altering the global energy balance via scattering and absorbing solar radiation (direct effects), and by their effect on the reflectance of clouds and occurrence of precipitation (indirect effects). Aerosols also influence biogeochemical cycles, lead to diminished environmental visibility, and harm human health. This thesis focuses on advancing knowledge of critica...
[1] Airborne measurements in regions of varying meteo‐ rology and pollution are used to quantify the contribution of organic acids and a mass spectral marker for oxygenated aerosols, m/z 44, to the total organic aerosol budget. Organic acids and m/z 44 separately are shown to exhibit their highest organic mass fractions in the vicinity of clouds. The contribution of such oxygenated species is s...
Sea spray is one of the largest natural aerosol sources and plays an important role in the Earth's radiative budget. These particles are inherently hygroscopic, that is, they take-up moisture from the air, which affects the extent to which they interact with solar radiation. We demonstrate that the hygroscopic growth of inorganic sea salt is 8-15% lower than pure sodium chloride, most likely du...
Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is one of the major commercial conifer species in China. The present study concentrated on the assessment of growth, wood property traits, and strobili number in a 12-year grafted clone test of 62 Chinese fir breeding parents, aiming to describe the variation and correlations between these traits and to identify parent clones with the highest p...
The chemical and physical differences of secondary organic aerosol (SOA) formed at select isothermal temperatures (278 K, 300 K, and 313 K) are explored with respect to density, particle volatility, particle hygroscopicity, and elemental chemical composition. A transition point in SOA density, volatility, hygroscopicity and elemental composition is observed near 290–292 K as SOA within an envir...
Abstract Key message Hygroscopicity is a crucial element of bark water storage and can reach >60% holding capacity depending on tree species Bark forms the outer layer woody plants, it directly exposed to wetting during rainfall reacts changes in relative humidity, i.e., may exchange with atmosphere through absorption desorption vapor. A current paradigm hydrology suggests that maximum empti...
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