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Concentration, temporal variation, and sources of black carbon in the Mt. Everest region retrieved by real-time observation and simulation
Chen, XT (Chen, Xintong)1,4; Kang, SC (Kang, Shichang)1,2,4; Cong, ZY (Cong, Zhiyuan)2,3; Yang, JH (Yang, Junhua)1; Ma, YM (Ma, Yaoming)2,3
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
2018-09-06
Volume18Issue:17Pages:12859-12875
DOI10.5194/acp-18-12859-2018
Abstract

Based on the high-resolution measurement of black carbon (BC) at the Qomolangma (Mt. Everest) Station (QOMS, 28.36 degrees N, 86.95 degrees E, 4276 m a.s.l.) from 15 May 2015 to 31 May 2017, we investigated the seasonal and diurnal variations in BC and its potential source regions. Both monthly and daily mean BC concentrations reached the highest values in the pre-monsoon season and the lowest values in the monsoon season. The highest monthly and daily mean BC concentrations were at least 1 order of magnitude higher than the lowest concentrations. For the diurnal variation, the BC concentrations remained significantly high from late at night to morning in the pre-monsoon season. Meanwhile, the westerly winds prevailed during this period, implying the potential for pollutants to be transported across the Himalayas from long-distance sources to QOMS along the valley. In the monsoon season, the BC concentrations remained low but peaked in the morning and at noon, which might be caused by local emissions from cooking. By analyzing the simulation results from the backward trajectories of air masses and the fire spot distribution from the MODIS data, we found that the seasonal cycle of BC was significantly influenced by the atmospheric circulation and combustion intensity in the Mt. Everest region. The transport mechanisms of BC were further revealed using a WRF-Chem simulation during severe pollution episodes. For the pollution event in the monsoon season, BC aerosols in southern Asia were uplifted and transported to the Mt. Everest region by the southerly winds in the upper atmosphere. However, for the events in the pre-monsoon season, BC from northern India was transported and concentrated on the southern slope of the Himalayas by the northwesterly winds in the lower atmosphere and then transported across the Himalayas by the mountain-valley wind. A relatively smaller amount of BC from northwestern India and central Asia was transported to the Mt. Everest region by the westerly winds in the upper atmosphere.

Subject Area地理学
WOS IDWOS:000443861100005
Language英语
Indexed BySCIE
KeywordLight-absorbing Impurities Tibetan Plateau Concentrations Aerosol Optical-properties Particle Soot Photometer Atmospheric Brown Clouds Indo-gangetic Plains High-altitude Site Aethalometer Data Mass Concentration Air-quality
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国内
ISSN1680-7316
Department环境变化与地表过程重点实验室
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8548
Collection图书馆
Corresponding AuthorKang, SC (Kang, Shichang)
Affiliation1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Chen, XT ,Kang, SC ,Cong, ZY ,et al. Concentration, temporal variation, and sources of black carbon in the Mt. Everest region retrieved by real-time observation and simulation[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(17):12859-12875.
APA Chen, XT ,Kang, SC ,Cong, ZY ,Yang, JH ,&Ma, YM .(2018).Concentration, temporal variation, and sources of black carbon in the Mt. Everest region retrieved by real-time observation and simulation.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(17),12859-12875.
MLA Chen, XT ,et al."Concentration, temporal variation, and sources of black carbon in the Mt. Everest region retrieved by real-time observation and simulation".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.17(2018):12859-12875.
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