Communication Dans Un Congrès Année : 2023

Differentiating mixed plumes from aged Ambae and Raikoke volcanic emissions and the Asian Tropopause Aerosol Layer using Balloon measurements and Satellite observations

Résumé

The physical, chemical, and optical properties of stratospheric aerosols have been investigated during the Balloon measurements of the Asian Tropopause Aerosol Layer (BATAL) campaigns since 2014. The Asian Summer Monsoon (ASM) is a prominent conduit for boundary layer pollutants to the upper troposphere and lower stratosphere (UTLS) region. Satellites such as CALIPSO and SAGE enabled researchers to reveal the existence of an enhanced aerosol layer between 13-18 km called the Asian Tropopause Aerosol Layer (ATAL), a recurrent phenomenon during the ASM. Data collected in this region during the BATAL campaign in the summer of 2017 showed the presence of nitrate and nitrite as the dominant components among others. However, the stratospheric aerosol layer has witnessed several volcanic perturbations from the 2018 Ambae and 2019 Raikoke eruptions, making it challenging during the 2019 campaign to study the ATAL. Aerosol samples collected above the ATAL in the lower stratosphere (18-19 km) using the balloon-borne 4-stage aerosol impactor show the footprint of sulfate on all 4 stages with particle size radii ranging from 2 - 0.05 µm co-existing with ammonium (NH4+), indicating the presence of ammonium sulfate possibly as a signature of those eruptions. We use balloon measurements of aerosol size distribution and backscatter properties together with satellite observations from SAGE-III/ISS and CALIPSO to study the influence of these volcanic plumes on UTLS aerosols above the ASM. In addition, we calculate back trajectories with the FLEXible PARTicle dispersion model (FLEXPART) to understand the origin of the air masses sampled during the campaign. We intend to separate the contributions of Raikoke, Ambae, and the ATAL on UTLS aerosols using simulations from the GEOS-Chem chemical transport model.

Fichier non déposé

Dates et versions

insu-04652818 , version 1 (18-07-2024)

Identifiants

Citer

Hazel Vernier, Gwenaël Berthet, Anil Patel, Jean-Paul Vernier, Neeraj Rastogi, et al.. Differentiating mixed plumes from aged Ambae and Raikoke volcanic emissions and the Asian Tropopause Aerosol Layer using Balloon measurements and Satellite observations. AGU Fall Meeting 2023, 0000, à renseigner, Unknown Region. ⟨insu-04652818⟩
75 Consultations
0 Téléchargements

Partager

  • More