Deep waters a significant source of Black Carbon aerosols in the Arabian Sea

Soni, Ashish; Soyam, Pawan S.; Bankar, Shivdas; Prabhakaran, Thara; Fernando, Harindra J.S.; Gamage, Devmi; Modjeski, Griffin; Bolella, Selina; Goes, Joaquim; Kovach, Charles; Bera, Sudarsan; Aravindhavel, A.; Zoffoli, Maria L.; Tandon, Amit; Konwar, Mahen; Murugavel, P.; Safai, Pramod; Decesari, Stefano; Facchini, Maria C.; Lee, Craig M.; Kalarikkal, Nandakumar

doi:10.1088/1748-9326/adc751

i

Deep waters a significant source of Black Carbon aerosols in the Arabian Sea

Supporting Files

2025
By Soni, Ashish ; Soyam, Pawan S. ; Bankar, Shivdas ; ...

Details

Journal Title:

Environmental Research Letters
Personal Author:

Soni, Ashish ; Soyam, Pawan S. ; Bankar, Shivdas ; Prabhakaran, Thara ; Fernando, Harindra J.S. ; Gamage, Devmi ; Modjeski, Griffin ; Bolella, Selina ; Goes, Joaquim ; Kovach, Charles ; Bera, Sudarsan ; Aravindhavel, A. ; Zoffoli, Maria L. ; Tandon, Amit ; Konwar, Mahen ; Murugavel, P. ; Safai, Pramod ; Decesari, Stefano ; Facchini, Maria C. ; Lee, Craig M. ; Kalarikkal, Nandakumar
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research)
Description:

In-situ observations of atmospheric Black Carbon (BC) aerosols over the northern Indian Ocean are sparse, especially during the Indian Summer Monsoon season due to harsh and challenging oceanic conditions associated with strong south-westerly winds and rough sea states. In the present study, we measured atmospheric BC over the Arabian Sea (AS) during June on board a research expedition. While BC is expected to decrease as we move away from continental landmass, surprisingly, despite negligible land-based combustion activities at this time of the year, a zone of high BC was observed offshore within a narrow band impacted by the Biparjoy cyclone. The median BC concentration was two-fold higher within the cyclone-impacted zone than in the region east of this zone. Airmass back-trajectory and satellite fire map analysis revealed that savanna burning in Africa could significantly affects elevated BC signals over the AS. However, the absence of correlation of BC with biomass-burning tracers inside the high-BC zone clearly suggested some other active source(s). Correlation analysis of BC with oceanic deep-water vertical mixing indicators as well as atmospheric processes provides vital pointers that a significant amount of this BC can be regurgitated from waters, which are brought to the surface from depth, as the deep ocean is one of largest reservoirs of BC aerosols. These findings demand a nascent scope for controlled simulation experiments to estimate regurgitated BC from the ocean to reduce its uncertainty.
Keywords:

Aerosols Cyclonses Monsoons Black Carbon Aerosol Indian Summer Monsoon
Source:

Ashish Soni et al 2025 Environ. Res. Lett. 20 054049
DOI:

https://doi.org/10.1088/1748-9326/adc751
Format:

PDF
Document Type:

Journal Article
Place as Subject:

Arabian Sea
License:

https://creativecommons.org/publicdomain/zero/1.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

urn:sha-512:8f7bea13051de8c21e2b4e7aa737a737f340c6f2fe17f0a44dc4b896896e61f83ef1b0e03e789bbad0f5cd2ccd731470ed2c10be4cae8f7c9a7f18bfb4e64247
Download URL:

https://repository.library.noaa.gov/view/noaa/73401/noaa_73401_DS1.pdf
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[PDF - 2.39 MB ]

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