Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2018.01.018 |
Scattering and absorption characteristics of aerosols at an urban megacity over IGB: Implications to radiative forcing | |
Srivastava, A. K.1; Bisht, D. S.1; Singh, Sachchidanand2; Kishore, N.1,4; Soni, V. K.3; Singh, Siddhartha3; Tiwari, S.1 | |
2018-06-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 205页码:107-117 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | Aerosol scattering and absorption characteristics were investigated at an urban megacity Delhi in the western Indo-Gangetic Basin (IGB) during the period from October 2011 to September 2012 using different in-situ measurements. The scattering coefficient (sigma(sp) at 550 nm) varied between 71 and 3014 Mm(-1) (mean similar to 710 +/- 615 Mm(-1)) during the entire study period, which was about ten times higher than the absorption coefficient (sigma(abs) at 550 nm similar to 67 +/- 40 Mm(-1)). Seasonally, sigma(sp) and sigma(abs) were substantially higher during the winter/post-monsoon periods, which also gave rise to single scattering albedo (SSA) by similar to 5%. The magnitude of SSA (at 550 nm) varied between 0.81 and 0.94 (mean: 0.89 +/- 0.05). Further, the magnitude of scattering Angstrom exponent (SAE) and back-scattering Angstrom exponent (BAE) showed a wide range from -1.20 to 1.57 and -1.13 to 0.87, respectively which suggests large variability in aerosol sizes and emission sources. Relatively higher aerosol backscatter fraction (b at 550 nm) during the monsoon (0.25 +/- 0.10) suggests more inhomogeneous scattering, associated with the coarser dust particles. However, lower value of b during winter (0.13 +/- 0.02) is associated with more isotropic scattering due to dominance of smaller size particles. This is further confirmed with the estimated asymmetry parameter (AP at 550 nm), which exhibits opposite trend with b. The aerosol optical parameters were used in a radiative transfer model to estimate aerosol radiative forcing. A mean radiative forcing of -61 +/- 22 Wm(-2) (ranging from -111 to -40 Wm(-2)) was observed at the surface and 42 24 Wm(-2) (ranging from 18 to 87 Wm(-2)) into the atmosphere, which can give rise to the mean atmospheric heating rate of 1.18 K day(-1). |
英文关键词 | Scattering coefficient Absorption coefficient Single scattering albedo Asymmetry parameter Backscatter fraction Radiative forcing |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429512200011 |
WOS关键词 | INDO-GANGETIC BASIN ; BLACK CARBON AEROSOLS ; ASIAN SUMMER MONSOON ; LONG-RANGE TRANSPORT ; OPTICAL-PROPERTIES ; HIMALAYAN REGION ; INTEGRATING NEPHELOMETER ; ATMOSPHERIC AEROSOLS ; SEASONAL VARIABILITY ; ASYMMETRY PARAMETER |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/15185 |
专题 | 地球科学 |
作者单位 | 1.Indian Inst Trop Meteorol Branch, Prof Ramanath Vij Marg, New Delhi, India; 2.Natl Phys Lab, CSIR, Environm & Biomed Metrol Div, New Delhi, India; 3.Indian Meteorol Dept, Lodhi Rd, New Delhi, India; 4.Gurukula Kangri Univ, Dept Phys, Haridwar, India |
推荐引用方式 GB/T 7714 | Srivastava, A. K.,Bisht, D. S.,Singh, Sachchidanand,et al. Scattering and absorption characteristics of aerosols at an urban megacity over IGB: Implications to radiative forcing[J]. ATMOSPHERIC RESEARCH,2018,205:107-117. |
APA | Srivastava, A. K..,Bisht, D. S..,Singh, Sachchidanand.,Kishore, N..,Soni, V. K..,...&Tiwari, S..(2018).Scattering and absorption characteristics of aerosols at an urban megacity over IGB: Implications to radiative forcing.ATMOSPHERIC RESEARCH,205,107-117. |
MLA | Srivastava, A. K.,et al."Scattering and absorption characteristics of aerosols at an urban megacity over IGB: Implications to radiative forcing".ATMOSPHERIC RESEARCH 205(2018):107-117. |
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