دانلود رایگان مقاله لاتین رطوبت پسند آئروسل از سایت الزویر
عنوان فارسی مقاله:
تاثیر رشد رطوبت پسند آئروسل در اثر تابش مستقیم آئروسل در تابستان در دشت شمال چین
عنوان انگلیسی مقاله:
Impact of aerosol hygroscopic growth on the direct aerosol radiative effect in summer on North China Plain
سال انتشار : 2016
برای دانلود رایگان مقاله رطوبت پسند آئروسل اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Tropospheric aerosols affect the energy balance on the Earth by directly scattering and absorbing solar radiation and indirectly changing the properties and lifespans of clouds (Boucher et al., 2013). The changes in irradiance due to the interaction of aerosol and radiation are commonly described in terms of the direct aerosol radiative effect (DARE), and their estimates remain largely uncertain (Boucher et al., 2013). These uncertainties are mainly caused by the high temporal, spatial and compositional variability of aerosols as well as RH fields and an incomplete understanding of related, integral aerosol optical properties. Because many components of aerosol particles are hygroscopic, the particles can take up water and change in size depending on their chemical composition and the ambient relative humidity (RH). Hygroscopic growth becomes particularly important when the RH is greater than 60% and water often comprises more than 50% of the fine particle mass when the RH exceeds 70e80% (Bian et al., 2014; McMurry, 2000). Therefore, RH is an important parameter that governs the optical properties of aerosols and DARE. Previously, numerous studies have investigated the dependence of aerosol optical properties on RH by considering the aerosol scattering coefficient (ssp) (Zieger et al., 2013), single scattering albedo (SSA) (Tao et al., 2014; Yoon and Kim, 2006), hemispheric scattering coefficient (Titos et al., 2014) and asymmetry factor (g) (Yoon and Kim, 2006). However, these studies were mainly based on surface measurements and only considered the RH at the surface. Few studies have investigated the influence of RH profiles on thecolumnar aerosol optical properties generally used to estimate the DARE at the top of the atmosphere (TOA) and at the surface. Using meteorological and aerosol measurements obtained aboard an aircraft, Yoon and Kim (2006) presented RH and ssp profiles under ambient and low RH conditions and demonstrated that ssp is significantly enhanced at ambient RH conditions relative to dry conditions. However, in that study, the vertical characteristics of RH and the influences of RH profiles on the aerosol optical depth (AOD), column-averaged SSA and g were not analyzed. Using RH measurements and a system of two nephelometers operated in parallel aboard an aircraft, Shinozuka et al. (2007) investigated the influences of RH profiles on ambient AOD and found that the fraction of ambient AOD due to water uptake was 37 ± 15% (average and standard deviation). Observationally based sensitivity studies conducted by Brock et al. (2016) indicate that the relationship between AOD and dry aerosol mass can be highly variable but is especially sensitive to RH. However, the influences of the RH pro- files on SSA and g were not investigated.
برای دانلود رایگان مقاله رطوبت پسند آئروسل اینجا کلیک نمایید.
کلمات کلیدی:
[PDF]The impact of aerosol hygroscopic growth on the ... - Atmos. Chem. Phys www.atmos-chem-phys.net/14/12055/2014/acp-14-12055-2014.pdf by JC Tao - 2014 - Cited by 6 - Related articles Nov 17, 2014 - The increase of JNO2 due to the aerosol hygroscopic growth above the upper ... forcing of direct aerosol effect takes place when the value of. [PDF]Hygroscopic properties of aerosol particles at ... - Atmos. Chem. Phys www.atmos-chem-phys.net/11/3479/2011/acp-11-3479-2011.pdf by PF Liu - 2011 - Cited by 109 - Related articles Apr 14, 2011 - Moreover, aerosol particles influence the earth's radiative budget directly ... induce large uncertainties in the estimation of aerosol direct effect on the ... to represent aerosol hygroscopic growth as well as the abil- ity of aerosol ... [PDF]Aerosol mixing state, hygroscopic growth and ... - Atmos. Chem. Phys www.atmos-chem-phys.net/13/5049/2013/acp-13-5049-2013.pdf by S Lance - 2013 - Cited by 28 - Related articles May 15, 2013 - Observations of aerosol hygroscopic growth and. CCN activation ... The impact of aerosols on climate, visibility and human health depends on the ..... activation curve by directly substituting sc (in terms of κ,. Eq. (4)) into Eq. (3) ... Relative humidity and its effect on aerosol optical depth ... - IOPscience iopscience.iop.org/article/10.1088/1748-9326/8/3/034025/pdf by O Altaratz - 2013 - Cited by 10 - Related articles Sep 4, 2013 - The hygroscopic growth of aerosols is controlled by the relative ... and should be considered in direct and indirect aerosol effect estimations. [PDF]Hygroscopic growth of atmospheric aerosol ... - Atmos. Meas. Tech www.atmos-meas-tech.net/8/705/2015/amt-8-705-2015.pdf by MJ Granados-Muñoz - 2015 - Cited by 11 - Related articles Feb 10, 2015 - We analyzed the hygroscopic growth effects on aerosol properties, namely the ... Therefore, hygroscopic growth affects the direct scat- tering of ... Investigation of hygroscopic growth effect on aerosol scattering ... https://www.researchgate.net/.../316593298_Investigation_of_hygroscopic_growth_effe... May 1, 2017 - Aerosol optical properties and the effect of hygroscopic growth on the .... Impact of aerosol hygroscopic growth on the direct aerosol radiative ...
