In Situ Aerosol Size Spectra Measurements in the Austral Polar Vortex Before and After the Hunga Tonga‐Hunga Ha'apai Volcanic Eruption

Deshler, Terry; Kalnajs, Lars E.; Norgren, Matthew; Zhu, Yunqian; Zhang, Jun

doi:10.1029/2024gl111388

i

In Situ Aerosol Size Spectra Measurements in the Austral Polar Vortex Before and After the Hunga Tonga‐Hunga Ha'apai Volcanic Eruption

2024
By Deshler, Terry ; Kalnajs, Lars E. ; Norgren, Matthew ; ...

Details

Journal Title:

Geophysical Research Letters
Personal Author:

Deshler, Terry ; Kalnajs, Lars E. ; Norgren, Matthew ; Zhu, Yunqian ; Zhang, Jun
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)
Description:

Aerosol from the Hunga Tonga‐Hunga Ha'apai (HT‐HH) volcanic eruption (20.6°S) in January 2022 were not incorporated into the austral polar vortex until the following year, March 2023. Within the polar vortex in situ profiles of aerosol size spectra were completed in the austral autumns of 2019 and 2023, from McMurdo Station, Antarctica (78˚S), 30 months prior to and 15 months after the HT‐HH eruption. The measurements indicate that the HT‐HH impact on aerosol size was primarily confined to particles with diameters >0.5 μm leading to differences in aerosol mass, surface area, and extinction from factors of 2–4 at the volcanic layer's peak below 20 km, increasing to ratios of 5–10 above 20 km. Effective radius, with radiative and microphysical implications, increased from ∼0.2 to ∼0.3 μm. An Earth system model with a modal aerosol package compares favorably with the in situ measurements of the HT‐HH aerosol impact.
Source:

Geophysical Research Letters, 51(22)
DOI:

https://doi.org/10.1029/2024gl111388
ISSN:

0094-8276 ; 1944-8007
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:

CC BY-NC-ND
Compliance:

Library
Main Document Checksum:

urn:sha-512:206ef4f70eeb58d6e1a1fb39dc103b69d18d39abbb1f81cbc9ef8f5ecb3b6b7f5ed6dec815fb66db33b08fec4d378e3108906176b939e1618f3e24dc37dc655c
Download URL:

https://repository.library.noaa.gov/view/noaa/68707/noaa_68707_DS1.pdf
File Type:

[PDF - 2.15 MB ]

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