气候变化领域集成服务门户(CCPortal): Long-term (2008–2017) analysis of atmospheric composite aerosol and black carbon radiative forcing over a semi-arid region in southern India: Model results and ground measurement

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DOI	10.1016/j.atmosenv.2020.117840
	Long-term (2008–2017) analysis of atmospheric composite aerosol and black carbon radiative forcing over a semi-arid region in southern India: Model results and ground measurement
	Kalluri R.O.R.; Gugamsetty B.; Kotalo R.G.; Thotli L.R.; Tandule C.R.; Akkiraju B.
发表日期	2020
ISSN	1352-2310
卷号	240
英文摘要	To achieve an in-depth understanding of radiative forcing due to aerosols is a crucial challenge for climate change studies. The first-ever long-term measurement of direct shortwave composite and black carbon aerosol radiative properties over a semi-arid region, Anantapur, in southern India is presented. Long-term variations in Aerosol Optical Depth (AOD) and Black Carbon (BC) mass concentration from December 2007 to November 2017 are discussed with specific emphasis on intra-seasonal variation in aerosol optical properties, meteorology, transport pathways, and their implications for direct short wave radiative forcing over Anantapur. The intra-seasonal mean AOD showed strong seasonal dependence with the highest (0.47 ± 0.03) during summer and lowest (0.28 ± 0.03) during the monsoon. Meanwhile, the intra-seasonal mean (±σ) BC mass concentration was about 3.57 ± 0.45, 2.60 ± 0.58, 1.22 ± 0.18 and 2.24 ± 0.28 μg m−3 during winter, summer, monsoon and post-monsoon respectively. Furthermore, there is an obvious temporal variation in intra-seasonal BC mass concentration during the dry season (winter and summer). To be more specific, the intra-seasonal mean (±σ) BC mass concentration before 2012 (after 2012) during the dry season was about 3.37 ± 0.7 μg m−3 (2.80 ± 0.58 μg m−3), respectively. Concentration weighted trajectory analyses (CWT) revealed that the air masses originated from the continental and polluted environments located in the central and northern parts of India (except monsoon), in regulating BC mass concentration over measurement location. Further, Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) derived aerosol vertical extinction profiles (532 nm) showed that majority aerosols (>250 Mm−1) are confined within 2 km from the surface during winter while in summer particles are distributed throughout the profile (~6 km) with extinction coefficient varying between 200 and 250 Mm−1. The Santa Barbara Discrete Ordinate Radiative Transfer (SBDART) model estimated intra-seasonal mean direct shortwave composite aerosol radiative forcing (DARF) in the atmosphere (ATM) was about 31.13 ± 3.36, 34.82 ± 3.89, 17.10 ± 1.15, and 17.44 ± 1.81 Wm-2 during winter, summer, monsoon and post-monsoon, respectively. The positive signs of ATM forcing in all seasons indicate a warming of the atmosphere, and the corresponding heating rate was around a factor of two higher during the dry season (0.92 ± 0.12 Kday−1) than the wet season (monsoon and post-monsoon) (0.49 ± 0.04 Kday−1). The intra-seasonal mean BC forcing in ATM before 2012 (After 2012) during the dry season was about 24.14 ± 2.85Wm-2(20.09 ± 2.59Wm-2), respectively. The contribution of BC alone to the composite forcing during the study period over the station was ~68%. These findings would be helpful for regional climate studies and making air pollution control policy over the region. © 2020 Elsevier Ltd
关键词	Aerosols Climate change Radiative forcing Semi-arid region
语种	英语
scopus关键词	Air pollution control; Arid regions; Atmospheric radiation; Atmospheric thermodynamics; Carbon; Drought; Fog; Global warming; Optical properties; Optical radar; Aerosol optical depths; Aerosol optical property; Aerosol radiative forcing; Cloud-aerosol lidar and infrared pathfinder satellite observations; Extinction coefficients; In-depth understanding; Long-term measurements; Measurement locations; Aerosols; black carbon; aerosol; atmospheric forcing; atmospheric modeling; black carbon; climate change; concentration (composition); ground-based measurement; long-term change; optical depth; semiarid region; shortwave radiation; aerosol; air pollution control; Article; climate change; cooling; dry season; India; infrared radiation; monsoon climate; priority journal; radiative forcing; rainy season; semiarid climate; summer; surface property; winter; Anantapur; Andhra Pradesh; India
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248975
作者单位	Aerosol & Atmospheric Research Laboratory, Department of Physics, Sri Krishnadevaraya University, Anantapur, Andhra Pradesh 515 003, India
推荐引用方式 GB/T 7714	Kalluri R.O.R.,Gugamsetty B.,Kotalo R.G.,等. Long-term (2008–2017) analysis of atmospheric composite aerosol and black carbon radiative forcing over a semi-arid region in southern India: Model results and ground measurement[J],2020,240.
APA	Kalluri R.O.R.,Gugamsetty B.,Kotalo R.G.,Thotli L.R.,Tandule C.R.,&Akkiraju B..(2020).Long-term (2008–2017) analysis of atmospheric composite aerosol and black carbon radiative forcing over a semi-arid region in southern India: Model results and ground measurement.ATMOSPHERIC ENVIRONMENT,240.
MLA	Kalluri R.O.R.,et al."Long-term (2008–2017) analysis of atmospheric composite aerosol and black carbon radiative forcing over a semi-arid region in southern India: Model results and ground measurement".ATMOSPHERIC ENVIRONMENT 240(2020).