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Shi S, Cheng T, Gu X, Guo H, Wu Y, Wang Y, Bao F, Zuo X. Probing the dynamic characteristics of aerosol originated from South Asia biomass burning using POLDER/GRASP satellite data with relevant accessory technique design. ENVIRONMENT INTERNATIONAL 2020; 145:106097. [PMID: 32911245 DOI: 10.1016/j.envint.2020.106097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 08/16/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
The dynamic characteristics of biomass burning aerosol originated from South Asia are investigated in this research using nearly 9 years of POLDER/GRASP satellite aerosol dataset. The POLDER/GRASP remote sensing data can provide global, repeatable, various, and sufficient real-world aerosol information even in the remote ocean region, which can't be offered by the ground measurement, laboratory observation or model simulation. The MODIS thermal anomalies/fire dataset and HYSPLIT backward trajectory are applied to search the aerosol originated from South Asia biomass burning. The biomass burning aerosol originated from South Asia could transport to and influence the north part of Indian Ocean (including Bay of Bengal and Arabian Sea), the north part of Indo-China Peninsula, South China, and even far to the Pacific Ocean (including part of East China Sea and South China Sea). The chemical, physical and optical characteristics of biomass burning aerosol over land and over ocean show different features and evolution patterns. Such difference is caused by the different ambient environment and different mixed aerosol during the transport process (urban/industrial aerosol over land and sea salt over ocean). During the 48-hours aging process, the volume fraction of black carbon, AAOD and Angstrom Exponent decrease. Meanwhile, the aerosol sphere fraction and SSA increase. The biomass burning aerosol over land shows a more obvious evolution trend than that over ocean. The biomass burning aerosol over ocean generally have higher SSA and lower volume fraction of black carbon, aerosol sphere fraction, AAOD and Angstrom Exponent. The aerosol radiative forcing efficiency also varies between land and ocean, due to their different features of aerosol and surface properties. In general, a negative clear-sky aerosol radiative forcing efficiency (cooling effect) at the TOA is observed. The aerosol cooling effect at the TOA over ocean (-82 W/m2 on average) is much stronger than that over land (-36 W/m2 on average). During the 48-hours aging process, a significant enhancement of the negative radiative forcing efficiency at the TOA is found over land. Over ocean, the enhancement of the negative radiative forcing efficiency at the TOA is weaker.
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Affiliation(s)
- Shuaiyi Shi
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
| | - Tianhai Cheng
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
| | - Xingfa Gu
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
| | - Hong Guo
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
| | - Yu Wu
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
| | - Ying Wang
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
| | - Fangwen Bao
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China
| | - Xin Zuo
- State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China; University of Chinese Academy of Sciences, Beijing 100049, China
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Morang JL, Galpin T, Greenslade ME. Effective Refractive Index Values and Single Scattering Albedo Implications for Dry-Generated Clays As Retrieved from Cavity Ring-Down Spectroscopy. Anal Chem 2018; 90:11248-11255. [PMID: 30148620 DOI: 10.1021/acs.analchem.8b01319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Despite the widespread atmospheric presence of mineral dust and clay aerosol, there is still much uncertainty associated with their contribution to climate forcing especially as related to their nonspherical shape and rough surface. This paper provides a method for retrieving effective refractive indices for a series of clay aerosols produced via dry-generation, which more closely captures natural emission mechanisms. Aerosols were generated using a wrist-action shaker, size determined via tandem differential mobility analysis and optically interrogated with a cavity ring-down spectrometer. The three specific aerosols studied are montmorillonite, Na-rich montmorillonite, and illite. The retrieved refractive indices at 532 nm, room temperature, and <2% relative humidity are m = 1.55(3) + 0.15(6) i, m = 1.60(2) + 0.00(4) i, and m = 1.27(4) + 0.31(7) i, respectively. The effective and bulk refractive index values were then used to calculate single scattering albedo, which shows the changed warming potential of montmorillonite and illite based on effective values. These results may be used to refine the inclusion of dust components in climate models.
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Affiliation(s)
- Jillian L Morang
- Department of Chemistry , University of New Hampshire , Durham , New Hampshire 03824 , United States
| | - Tyler Galpin
- Department of Chemistry , University of New Hampshire , Durham , New Hampshire 03824 , United States
| | - Margaret E Greenslade
- Department of Chemistry , University of New Hampshire , Durham , New Hampshire 03824 , United States
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