干旱区生态环境知识资源中心(Arid): First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India

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DOI	10.1016/j.atmosenv.2020.118123
	First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India
	Gautam, Alok Sagar; Tripathi, S. N.; Joshi, Abhishek; Mandariya, Anil Kumar; Singh, Karan; Mishra, Gaurav; Kumar, Sanjeev; Ramola, R. C.
通讯作者	Tripathi, SN (corresponding author), Indian Inst Technol, Dept Civil Engn, Kanpur, Uttar Pradesh, India. ; Joshi, A (corresponding author), Hemvati Nandan Bahuguna Garhwal Univ, Dept Phys, Badshahi Thaul Campus, Tehri Garhwal, Uttarakhand, India.
来源期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
EISSN	1873-2844
出版年	2021
卷号	246
英文摘要	A Droplet Measurement Technology (DMT) Cloud Condensation Nuclei Counter (CCNC) was deployed to measure cloud condensation nuclei (CCN) for the first time in the pristine Himalayan region at Himalayan Clouds Observatory (HCO), Swami Ram Tirtha (SRT) Campus (30 degrees 34' N, 78 degrees 41' E, 1706 m AMSL), Hemvati Nandan Bahuguna (HNB) Garhwal University, Badshahithaul, Tehri Garhwal, Uttarakhand, India. The CCN concentration (NCCN) was observed at four supersaturation levels (SS: 0.2, 0.5, 0.8, and 1.0%). In this study, we reported CCN concentration at 0.5% SS in different weather conditions from Aug 01, 2018 to Jun 30, 2019. During this observation period, the monthly averaged value of CCN concentration ranged between 1098.3 +/- 448.9 cm(-3) (mean +/- SD) and 3842.9 +/- 2512.9 cm(-3). It covers a significantly wide range of daily averaged concentrations from the minimum concentration of 43.84 cm(-3) (during heavy wet scavenging due to snowfall) to maximum concentration of 17000 cm(-3) (during the events of a forest fire) at the observation site. The highest CCN concentration is observed at the time of sunrise (similar to 07:00 a.m.) and after the sunset (similar to 07:00 p.m.) for the diurnal variation of monsoon, post-monsoon, and winter season. Pre-monsoon season shows peak values at 10:00 a.m. and at 07:00 p.m. with higher concentrations at night hours. The possible reasons for maximum concentration in morning and evening time could be upliftment and settlement of CCN because of the convection process, anthropogenic emission, vehicular emission, and biomass burning in the residential area and valley region adjacent to HCO, Badshahithaul. The highest CCN concentration (3842.9 +/- 2513 cm(-3)) values of the whole observation period were observed in May 2019. It was significantly affected by the heavy fire activities over the Uttarakhand and nearby IGP regions. Diurnal variation of CCN concentration during the HFAD shows higher values in the night time differing from the diurnal pattern of CCN for other months of the observation period. The long-range transport of air mass could also contribute to the high CCN concentration values, as found through the five-day air mass backward trajectory analysis. The lowest value of CCN concentration corresponds to the heavy rains and snowfall days, possibly caused by extensive wet scavenging. Cluster analysis of the air mass trajectories used for the allocation and classification of the possible sources of pollutants reaching the observation site. The highest fraction of CCN concentration (more than 2000 cm(-3)) corresponds to the air mass from the arid and semi-arid regions of Asian countries. Large air mass fraction (similar to 40-60%) with moderate CCN concentration was received from northwestern IGP region and foothills of central Himalaya.
英文关键词	CCN Aerosols Garhwal region Air-mass back trajectory CWT
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000613550100001
WOS关键词	POLYCYCLIC AROMATIC-HYDROCARBONS ; BIOMASS BURNING EMISSIONS ; AEROSOL-SIZE DISTRIBUTION ; ATMOSPHERIC BROWN CLOUDS ; CHEMICAL-COMPOSITION ; ORGANIC-COMPOUNDS ; ACTIVATION ; CARBON ; VARIABILITY ; STATION
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/2XILL650/349632
作者单位	[Gautam, Alok Sagar; Kumar, Sanjeev] Hemvati Nandan Bahuguna Garhwal Univ Srinagar, Dept Phys, Srinagar, Uttarakhand, India; [Tripathi, S. N.; Mandariya, Anil Kumar] Indian Inst Technol, Dept Civil Engn, Kanpur, Uttar Pradesh, India; [Joshi, Abhishek; Singh, Karan; Ramola, R. C.] Hemvati Nandan Bahuguna Garhwal Univ, Dept Phys, Badshahi Thaul Campus, Tehri Garhwal, Uttarakhand, India; [Mishra, Gaurav] IIT, Dept Mech Engn, Nucl Engn & Technol Programme, Kanpur, Uttar Pradesh, India
推荐引用方式 GB/T 7714	Gautam, Alok Sagar,Tripathi, S. N.,Joshi, Abhishek,et al. First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India[J],2021,246.
APA	Gautam, Alok Sagar.,Tripathi, S. N..,Joshi, Abhishek.,Mandariya, Anil Kumar.,Singh, Karan.,...&Ramola, R. C..(2021).First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India.ATMOSPHERIC ENVIRONMENT,246.
MLA	Gautam, Alok Sagar,et al."First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India".ATMOSPHERIC ENVIRONMENT 246(2021).