Trends in aerosol optical depth over Indian region: Potential causes and impact indicators
S. Suresh Babu,M. R. Manoj,K. Krishna Moorthy,Mukunda M. Gogoi,Vijayakumar S. Nair,Sobhan Kumar Kompalli,Sathianeson Satheesh,K. Niranjan,K. Ramagopal,Pradip Kumar Bhuyan,Darshan Singh +10 more
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TLDR
In this paper, the spectral variation of aerosol optical depth (AOD) revealed the significance of anthropogenic activities on the increasing trend in AOD with a significant seasonal variability.Abstract:
The first regional synthesis of long-term (back to similar to 25 years at some stations) primary data (from direct measurement) on aerosol optical depth from the ARFINET (network of aerosol observatories established under the Aerosol Radiative Forcing over India (ARFI) project of Indian Space Research Organization over Indian subcontinent) have revealed a statistically significant increasing trend with a significant seasonal variability. Examining the current values of turbidity coefficients with those reported similar to 50 years ago reveals the phenomenal nature of the increase in aerosol loading. Seasonally, the rate of increase is consistently high during the dry months (December to March) over the entire region whereas the trends are rather inconsistent and weak during the premonsoon (April to May) and summer monsoon period (June to September). The trends in the spectral variation of aerosol optical depth (AOD) reveal the significance of anthropogenic activities on the increasing trend in AOD. Examining these with climate variables such as seasonal and regional rainfall, it is seen that the dry season depicts a decreasing trend in the total number of rainy days over the Indian region. The insignificant trend in AOD observed over the Indo-Gangetic Plain, a regional hot spot of aerosols, during the premonsoon and summer monsoon season is mainly attributed to the competing effects of dust transport and wet removal of aerosols by the monsoon rain. Contributions of different aerosol chemical species to the total dust, simulated using Goddard Chemistry Aerosol Radiation and Transport model over the ARFINET stations, showed an increasing trend for all the anthropogenic components and a decreasing trend for dust, consistent with the inference deduced from trend in Angstrom exponent.read more
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Aerosol and monsoon climate interactions over Asia
Zhanqing Li,Zhanqing Li,William K. M. Lau,Veerabhadran Ramanathan,G. Wu,Y. Ding,M. G. Manoj,Jianjun Liu,Yun Qian,J. Li,Tianjun Zhou,Jiwen Fan,Daniel Rosenfeld,Yi Ming,Yuan Wang,Jianping Huang,Bin Wang,Bin Wang,Xiaobin Xu,Seoung Soo Lee,Maureen Cribb,Fang Zhang,Xingchuan Yang,Chuanfeng Zhao,Toshihiko Takemura,Kaicun Wang,Xiangao Xia,Yan Yin,Hui Zhang,Jianping Guo,Panmao Zhai,Nobuo Sugimoto,S. S. Babu,Guy Brasseur +33 more
TL;DR: A comprehensive review of studies on Asian aerosols, monsoons, and their interactions is provided in this article, where a new paradigm is proposed on investigating aerosol-monsoon interactions, in which natural aerosols such as desert dust, black carbon from biomass burning, and biogenic aerosols from vegetation are considered integral components of an intrinsic aerosolmonsoon climate system, subject to external forcing of global warming, anthropogenic aerosol, and land use and change.
BookDOI
Assessment of Climate Change over the Indian Region : A Report of the Ministry of Earth Sciences (MoES), Government of India
Raghavan Krishnan,J. Sanjay,Chellappan Gnanaseelan,Milind Mujumdar,Ashwini Kulkarni,Supriyo Chakraborty +5 more
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Atmospheric brown clouds reach the Tibetan Plateau by crossing the Himalayas
Z.L. Lüthi,Bojan Škerlak,Sang Woo Kim,Axel Lauer,Andrea Mues,Maheswar Rupakheti,Shichang Kang +6 more
TL;DR: In this paper, the authors used ground-based and satellite remote sensing data to identify a severe aerosol pollution episode observed simultaneously in central Tibet and on the southern side of the Himalayas during 13-19 March 2009 (pre-monsoon).
Journal ArticleDOI
Recent trends in aerosol optical properties derived from AERONET measurements
TL;DR: In this paper, the authors present the results of a trend analysis at selected stations with long data records, focusing on inversion products including absorption aerosol optical depth (ABS), single-scattering albedo (SSA), and absorption Angstrom exponent (AAE).
Journal ArticleDOI
Recent global aerosol optical depth variations and trends — A comparative study using MODIS and MISR level 3 datasets
TL;DR: In this paper, the authors presented global spatio-temporal variations in aerosol optical depth (AOD) retrieved by MODIS and Multiangle Imaging Spectroradiometer (MISR) sensors at spatial resolutions of 1°×-1° and 0.5°×−1° respectively.
References
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AERONET-a federated instrument network and data archive for aerosol Characterization
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Inaugural Article by a Recently Elected Academy Member
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Mian Chin,Paul Ginoux,Stefan Kinne,Stefan Kinne,Omar Torres,Omar Torres,Brent N. Holben,Bryan N. Duncan,Randall V. Martin,Jennifer A. Logan,Akiko Higurashi,Teruyuki Nakajima +11 more
TL;DR: The Georgia Institute of Technology's Goddardard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model is used to simulate the aerosol optical thickness t for major types of tropospheric aerosols including sulfate, dust, organic carbon (OC), black carbon (BC), and sea salt.