Arid
DOI10.5194/acp-15-12731-2015
Direct radiative effect by brown carbon over the Indo-Gangetic Plain
Arola, A.1; Schuster, G. L.2; Pitkanen, M. R. A.1,3; Dubovik, O.4; Kokkola, H.1; Lindfors, A. V.1; Mielonen, T.1; Raatikainen, T.5; Romakkaniemi, S.1; Tripathi, S. N.6,7; Lihavainen, H.
通讯作者Arola, A.
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2015
卷号15期号:22页码:12731-12740
英文摘要

The importance of light-absorbing organic aerosols, often called brown carbon (BrC), has become evident in recent years. However, there have been relatively few measurement-based estimates for the direct radiative effect of BrC so far. In earlier studies, the AErosol RObotic NETwork (AERONET)-measured aerosol absorption optical depth (AAOD) and absorption Angstrom exponent (AAE) were exploited. However, these two pieces of information are clearly not sufficient to separate properly carbonaceous aerosols from dust, while imaginary indices of refraction would contain more and better justified information for this purpose. This is first time that the direct radiative effect (DRE) of BrC is estimated by exploiting the AERONET-retrieved imaginary indices. We estimated it for four sites in the Indo-Gangetic Plain (IGP), Karachi, Lahore, Kanpur and Gandhi College. We found a distinct seasonality, which was generally similar among all the sites, but with slightly different strengths. The monthly warming effect up to 0.5 W m(-2) takes place during the spring season. On the other hand, BrC results in an overall cooling effect in the winter season, which can reach levels close to -1 W m(-2). We then estimated similarly also the DRE of black carbon and total aerosol, in order to assess the relative significance of the BrC radiative effect in the radiative effects of other components. Even though BrC impact seems minor in this context, we demonstrated that it is not insignificant. Moreover, we demonstrated that it is crucial to perform spectrally resolved radiative transfer calculations to obtain good estimates for the DRE of BrC.


类型Article
语种英语
国家Finland ; USA ; France ; India
收录类别SCI-E
WOS记录号WOS:000365977100003
WOS关键词AEROSOL OPTICAL-PROPERTIES ; ORGANIC-CARBON ; DESERT DUST ; AERONET ; DEPENDENCE ; NETWORK
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186071
作者单位1.Finnish Meteorol Inst, Kuopio, Finland;
2.NASA, Langley Res Ctr, Hampton, VA 23665 USA;
3.Univ Eastern Finland, Dept Appl Phys, Kuopio, Finland;
4.Univ Lille 1, CNRS, Opt Atmospher Lab, F-59655 Villeneuve Dascq, France;
5.Finnish Meteorol Inst, FIN-00101 Helsinki, Finland;
6.Indian Inst Technol, Dept Civil Engn, Kanpur 208016, Uttar Pradesh, India;
7.Indian Inst Technol, Ctr Environm Sci & Engn, Kanpur 208016, Uttar Pradesh, India
推荐引用方式
GB/T 7714
Arola, A.,Schuster, G. L.,Pitkanen, M. R. A.,et al. Direct radiative effect by brown carbon over the Indo-Gangetic Plain[J],2015,15(22):12731-12740.
APA Arola, A..,Schuster, G. L..,Pitkanen, M. R. A..,Dubovik, O..,Kokkola, H..,...&Lihavainen, H..(2015).Direct radiative effect by brown carbon over the Indo-Gangetic Plain.ATMOSPHERIC CHEMISTRY AND PHYSICS,15(22),12731-12740.
MLA Arola, A.,et al."Direct radiative effect by brown carbon over the Indo-Gangetic Plain".ATMOSPHERIC CHEMISTRY AND PHYSICS 15.22(2015):12731-12740.
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