Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources
Free tropospheric aerosol particles have important but poorly constrained climate effects due to transformations of their physicochemical properties during long-range transport. In this study, we investigate the chemical composition and provide an overview of the phase states of individual particles...
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ftcdlib:oai:escholarship.org:ark:/13030/qt0xj8t3q6 2023-07-02T03:33:05+02:00 Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources Cheng, Zezhen Morgenstern, Megan Zhang, Bo Fraund, Matthew Lata, Nurun Nahar Brimberry, Rhenton Marcus, Matthew A Mazzoleni, Lynn Fialho, Paulo Henning, Silvia Wehner, Birgit Mazzoleni, Claudio China, Swarup 9033 - 9057 2022-07-13 application/pdf https://escholarship.org/uc/item/0xj8t3q6 unknown eScholarship, University of California qt0xj8t3q6 https://escholarship.org/uc/item/0xj8t3q6 CC-BY Atmospheric Chemistry and Physics, vol 22, iss 13 Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences article 2022 ftcdlib 2023-06-12T18:00:59Z Free tropospheric aerosol particles have important but poorly constrained climate effects due to transformations of their physicochemical properties during long-range transport. In this study, we investigate the chemical composition and provide an overview of the phase states of individual particles that have undergone long-range transport over the North Atlantic Ocean in June and July 2014, 2015, and 2017 to the Observatory of Mount Pico (OMP) in the Azores. The OMP is an ideal site for studying long-range-transported free tropospheric particles because local emissions have a negligible influence and contributions from the boundary layer are rare. We used the FLEXible PARTicle Lagrangian particle dispersion model (FLEXPART) to determine the origins and transport trajectories of sampled air masses and found that most of them originated from North America and recirculated over the North Atlantic Ocean. The FLEXPART analysis showed that the sampled air masses were highly aged (average plume age >10 d). Size-resolved chemical compositions of individual particles were probed using computer-controlled scanning electron microscopy with an energy-dispersive X-ray spectrometer (CCSEM-EDX) and scanning transmission X-ray microscopy with near-edge X-ray absorption fine structure spectroscopy (STXM-NEXAFS). CCSEM-EDX results showed that the most abundant particle types were carbonaceous (∼ 29.9 % to 82.0 %), sea salt (∼ 0.3 % to 31.6 %), and sea salt with sulfate (∼ 2.4 % to 31.5 %). We used a tilted stage interfaced within an environmental scanning electron microscope (ESEM) to determine the phase states of individual submicron particles. We found that most particles (∼ 47 % to 99 %) were in the liquid state at the time of collection due to inorganic inclusions. Moreover, we also observed substantial fractions of solid and semisolid particles (∼ 0 % to 30 % and ∼ 1 % to 42 %, respectively) during different transport patterns and events, reflecting the particles' phase-state variability for different atmospheric ... Article in Journal/Newspaper North Atlantic University of California: eScholarship Mount Pico ENVELOPE(-62.450,-62.450,-64.167,-64.167) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences Cheng, Zezhen Morgenstern, Megan Zhang, Bo Fraund, Matthew Lata, Nurun Nahar Brimberry, Rhenton Marcus, Matthew A Mazzoleni, Lynn Fialho, Paulo Henning, Silvia Wehner, Birgit Mazzoleni, Claudio China, Swarup Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
topic_facet |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
description |
Free tropospheric aerosol particles have important but poorly constrained climate effects due to transformations of their physicochemical properties during long-range transport. In this study, we investigate the chemical composition and provide an overview of the phase states of individual particles that have undergone long-range transport over the North Atlantic Ocean in June and July 2014, 2015, and 2017 to the Observatory of Mount Pico (OMP) in the Azores. The OMP is an ideal site for studying long-range-transported free tropospheric particles because local emissions have a negligible influence and contributions from the boundary layer are rare. We used the FLEXible PARTicle Lagrangian particle dispersion model (FLEXPART) to determine the origins and transport trajectories of sampled air masses and found that most of them originated from North America and recirculated over the North Atlantic Ocean. The FLEXPART analysis showed that the sampled air masses were highly aged (average plume age >10 d). Size-resolved chemical compositions of individual particles were probed using computer-controlled scanning electron microscopy with an energy-dispersive X-ray spectrometer (CCSEM-EDX) and scanning transmission X-ray microscopy with near-edge X-ray absorption fine structure spectroscopy (STXM-NEXAFS). CCSEM-EDX results showed that the most abundant particle types were carbonaceous (∼ 29.9 % to 82.0 %), sea salt (∼ 0.3 % to 31.6 %), and sea salt with sulfate (∼ 2.4 % to 31.5 %). We used a tilted stage interfaced within an environmental scanning electron microscope (ESEM) to determine the phase states of individual submicron particles. We found that most particles (∼ 47 % to 99 %) were in the liquid state at the time of collection due to inorganic inclusions. Moreover, we also observed substantial fractions of solid and semisolid particles (∼ 0 % to 30 % and ∼ 1 % to 42 %, respectively) during different transport patterns and events, reflecting the particles' phase-state variability for different atmospheric ... |
format |
Article in Journal/Newspaper |
author |
Cheng, Zezhen Morgenstern, Megan Zhang, Bo Fraund, Matthew Lata, Nurun Nahar Brimberry, Rhenton Marcus, Matthew A Mazzoleni, Lynn Fialho, Paulo Henning, Silvia Wehner, Birgit Mazzoleni, Claudio China, Swarup |
author_facet |
Cheng, Zezhen Morgenstern, Megan Zhang, Bo Fraund, Matthew Lata, Nurun Nahar Brimberry, Rhenton Marcus, Matthew A Mazzoleni, Lynn Fialho, Paulo Henning, Silvia Wehner, Birgit Mazzoleni, Claudio China, Swarup |
author_sort |
Cheng, Zezhen |
title |
Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
title_short |
Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
title_full |
Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
title_fullStr |
Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
title_full_unstemmed |
Particle phase-state variability in the North Atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
title_sort |
particle phase-state variability in the north atlantic free troposphere during summertime is determined by atmospheric transport patterns and sources |
publisher |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/0xj8t3q6 |
op_coverage |
9033 - 9057 |
long_lat |
ENVELOPE(-62.450,-62.450,-64.167,-64.167) |
geographic |
Mount Pico |
geographic_facet |
Mount Pico |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, vol 22, iss 13 |
op_relation |
qt0xj8t3q6 https://escholarship.org/uc/item/0xj8t3q6 |
op_rights |
CC-BY |
_version_ |
1770272891508621312 |