TY - JOUR
T1 - Optical Properties of Fine Mode Aerosols over High-Altitude Himalayan Glacier Regions
AU - Verma, Sushant Ranjan
AU - Pervez, Shamsh
AU - Chow, Judith C.
AU - Watson, John G.
AU - Andrabi, Syed Muzaffarali
AU - Mandal, Papiya
AU - Khan, Noor Afshan
AU - Tiwari, Suresh
AU - Chandra Dumka, Umesh
AU - Chakrabarty, Rajan K.
AU - Verma, Madhuri
AU - Pervez, Yasmeen Fatima
AU - Mishra, Archi
AU - Tamrakar, Aishwaryashri
AU - Sowmya, Hulivahana Nagaraju
AU - Deb, Manas Kanti
AU - Ghosh, Kallol K.
AU - Jain, Vikas Kumar
AU - Karbhal, Indrapal
AU - Shrivas, Kamlesh
AU - Satnami, Manmohan Lal
N1 - Publisher Copyright:
© 2023 American Chemical Society
PY - 2023/8/17
Y1 - 2023/8/17
N2 - During the summer and winter periods of 2019-2020, we conducted sampling of fine mode ambient aerosols in the western Himalayan glacial region (WHR; Thajiwas glacier, 2799 m asl), central Himalayan glacial region (CHR; Gomukh glacier, 3415 m asl), and eastern Himalayan glacial region (EHR; Zemu glacier, 2700 m asl). We evaluated the aerosol optical properties, which included the mass absorption coefficient, mass absorption efficiency, mass scattering efficiency, absorption angstrom exponent, single scattering albedo, as well as their simple radiative forcing efficiencies. We observed the highest absorption in the near ultraviolet-visible wavelength range (200-400 nm), with CHR showing the highest absorption compared to the other two sites, WHR and EHR, respectively. Across the wavelength range of 200-1100 nm, the overall contribution of black carbon to light attenuation was greater than that of brown carbon. However, brown carbon dominated the absorption in the near UV-visible wavelengths, providing evidence of its non-trivial presence over the Himalayan region. Additionally, we observed a positive radiative forcing (W/g), which leads to net warming at these sites. The findings of this ground-based study contribute to our understanding of the light-absorbing nature of carbonaceous aerosols and their impact on the Himalayan glacier regions.
AB - During the summer and winter periods of 2019-2020, we conducted sampling of fine mode ambient aerosols in the western Himalayan glacial region (WHR; Thajiwas glacier, 2799 m asl), central Himalayan glacial region (CHR; Gomukh glacier, 3415 m asl), and eastern Himalayan glacial region (EHR; Zemu glacier, 2700 m asl). We evaluated the aerosol optical properties, which included the mass absorption coefficient, mass absorption efficiency, mass scattering efficiency, absorption angstrom exponent, single scattering albedo, as well as their simple radiative forcing efficiencies. We observed the highest absorption in the near ultraviolet-visible wavelength range (200-400 nm), with CHR showing the highest absorption compared to the other two sites, WHR and EHR, respectively. Across the wavelength range of 200-1100 nm, the overall contribution of black carbon to light attenuation was greater than that of brown carbon. However, brown carbon dominated the absorption in the near UV-visible wavelengths, providing evidence of its non-trivial presence over the Himalayan region. Additionally, we observed a positive radiative forcing (W/g), which leads to net warming at these sites. The findings of this ground-based study contribute to our understanding of the light-absorbing nature of carbonaceous aerosols and their impact on the Himalayan glacier regions.
KW - Himalayan glacier
KW - brown and black carbon
KW - carbonaceous matters
KW - light-absorbing aerosols
KW - radiative forcing
UR - https://www.scopus.com/pages/publications/85168507718
U2 - 10.1021/acsearthspacechem.3c00088
DO - 10.1021/acsearthspacechem.3c00088
M3 - Article
AN - SCOPUS:85168507718
SN - 2472-3452
VL - 7
SP - 1536
EP - 1544
JO - ACS Earth and Space Chemistry
JF - ACS Earth and Space Chemistry
IS - 8
ER -