Role of sulphate and carbonaceous aerosols on the radiative effects of aerosols over a remote high-altitude site Lachung in the Eastern Himalayas

被引：12

作者：

Arun, B. S. ^{[1
,2
]}

Gogoi, Mukunda M. ^{[1
]}

Borgohain, Arup ^{[3
]}

Hegde, Prashant ^{[1
]}

Kundu, Shyam Sundar ^{[3
]}

Babu, S. Suresh ^{[1
]}

机构：

[1] Vikram Sarabhai Space Ctr, Space Phys Lab, Thiruvananthapuram 695022, Kerala, India

[2] Univ Kerala, Res Ctr, Dept Phys, Thiruvananthapuram 695034, Kerala, India

[3] North Eastern Space Applicat Ctr, Umiam 793103, India

来源：

ATMOSPHERIC RESEARCH | 2021年 / 263卷

关键词：

Scattering coefficient; Absorption coefficient; Single scattering albedo; Organic carbon; Elemental carbon; Sulphate; Aerosol radiative forcing; INDO-GANGETIC PLAIN; P; 5079; M; BLACK CARBON; OPTICAL-PROPERTIES; LIGHT-ABSORPTION; CHEMICAL-COMPOSITION; ELEMENTAL CARBON; TIBETAN PLATEAU; ORGANIC-CARBON; CLIMATE-CHANGE;

D O I：

10.1016/j.atmosres.2021.105799

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

The rapid changes in the pattern of atmospheric warming as well as the degradation of glaciers in the Himalayas point to the inevitability of accurate source characterization and quantification of the impact of aerosols. In this regard, optical and chemical properties of aerosols, and their role in radiative effects are examined over a remote high-altitude site Lachung (27.4 degrees N, 88.4 degrees E, 2700 m a.s.l.) in the eastern Himalayas during August-2018 to February-2020. It is found that the sulphate (SO42- ) and carbonaceous aerosols (both organic carbon - OC and elemental carbon - EC) significantly contribute to the total aerosol mass loading in winter (DJF) and spring (MAM), resulting in high values of scattering and absorption coefficients. Aerosol single scattering albedo (SSA) is relatively higher in winter ( 0.85) due to a significantly higher amount of OC (OC/EC > 8). However, SSA 0.8 in spring despite of higher SO42- concentrations (SO42- /EC > 4.0 and SO42-/OC - 1.0) than winter. A reverse pattern is seen in summer-monsoon (JJAS) having lower SO42-/EC < 2 and SO42- /OC < 0.5, resulting in SSA as low as -0.64. The seasonal values of aerosol direct radiative forcing in the top of the atmosphere (DRFTOA) are as high as -2.9 +/- 1.2 Wm- 2 during the period of abundant OC in winter and -2.8 +/- 0.5 Wm- 2 during the period of abundant SO42- in spring. The combined effect of carbonaceous and SO42- aerosols on the surface cooling is highest in spring (-16.7 +/- 4.9 Wm- 2). DRF in the atmosphere is also - 34% higher in spring (13.8 +/- 4.5 Wm- 2, which translates to an atmospheric heating rate of - 0.39 K day-1), than in winter. The seasonal pattern of forcing influenced by the heterogeneous sources and chemical composition of aerosols over the eastern Himalayan site is significantly influenced by the transport of aerosols from the Indo-Gangetic Plains of India.

引用

页数：14

共 77 条

[1]

Anderson TL, 1996, J ATMOS OCEAN TECH, V13, P967, DOI 10.1175/1520-0426(1996)013<0967:PCOAHS>2.0.CO

[2]

[3] Determining aerosol radiative properties using the TSI 3563 integrating nephelometer [J].

Anderson, TL ;

Ogren, JA .

AEROSOL SCIENCE AND TECHNOLOGY, 1998, 29 (01) :57-69

[4] `Comparison of methods for deriving aerosol asymmetry parameter [J].

Andrews, E ;

Sheridan, PJ ;

Fiebig, M ;

McComiskey, A ;

Ogren, JA ;

Arnott, P ;

Covert, D ;

Elleman, R ;

Gasparini, R ;

Collins, D ;

Jonsson, H ;

Schmid, B ;

Wang, J .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2006, 111 (D5)

[5] Physico-chemical and optical properties of aerosols at a background site (∼4 km a.s.l.) in the western Himalayas [J].

Arun, B. S. ;

Aswini, A. R. ;

Gogoi, Mukunda M. ;

Hegde, Prashant ;

Kompalli, Sobhan Kumar ;

Sharma, Parmanand ;

Babu, S. Suresh .

ATMOSPHERIC ENVIRONMENT, 2019, 218

[6] Carbonaceous and inorganic aerosols over a sub-urban site in peninsular India: Temporal variability and source characteristics [J].

Aswini, A. R. ;

Hegde, Prashant ;

Nair, Prabha R. .

ATMOSPHERIC RESEARCH, 2018, 199 :40-53

[7] High altitude (∼4520 m amsl) measurements of black carbon aerosols over western trans-Himalayas: Seasonal heterogeneity and source apportionment [J].

Babu, S. S. ;

Chaubey, Jai Prakash ;

Moorthy, K. Krishna ;

Gogoi, Mukunda M. ;

Kompalli, Sobhan Kumar ;

Sreekanth, V. ;

Bagare, S. P. ;

Bhatt, Bhuvan C. ;

Gaur, Vinod K. ;

Prabhu, Tushar P. ;

Singh, N. S. .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2011, 116

[8] Spectral absorption properties of atmospheric aerosols [J].

Bergstrom, R. W. ;

Pilewskie, P. ;

Russell, P. B. ;

Redemann, J. ;

Bond, T. C. ;

Quinn, P. K. ;

Sierau, B. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2007, 7 (23) :5937-5943

[9] Biogenic particles formed in the Himalaya as an important source of free tropospheric aerosols [J].

Bianchi, F. ;

Junninen, H. ;

Bigi, A. ;

Sinclair, V. A. ;

Dada, L. ;

Hoyle, C. R. ;

Zha, Q. ;

Yao, L. ;

Ahonen, L. R. ;

Bonasoni, P. ;

Buenrostro Mazon, S. ;

Hutterli, M. ;

Laj, P. ;

Lehtipalo, K. ;

Kangasluoma, J. ;

Kerminen, V. -M. ;

Kontkanen, J. ;

Marinoni, A. ;

Mirme, S. ;

Molteni, U. ;

Petaja, T. ;

Riva, M. ;

Rose, C. ;

Sellegri, K. ;

Yan, C. ;

Worsnop, D. R. ;

Kulmala, M. ;

Baltensperger, U. ;

Dommen, J. .

NATURE GEOSCIENCE, 2021, 14 (01) :4-+

[10] A technology-based global inventory of black and organic carbon emissions from combustion [J].

Bond, TC ;

Streets, DG ;

Yarber, KF ;

Nelson, SM ;

Woo, JH ;

Klimont, Z .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2004, 109 (D14) :D14203

← 1 2 3 4 5 6 7 8 →