Sea spray aerosol organic enrichment, water uptake and surface tension effects
Abstract. The aerosol-driven radiative effects on marine low-level cloud represent a large uncertainty in climate simulations, in particular over the Southern Ocean, which is also an important region for sea spray aerosol production. Observations of sea spray aerosol organic enrichment and the resul...
Main Authors: | , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2020
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/8fj5218q |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt8fj5218q |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt8fj5218q 2023-11-05T03:45:14+01:00 Sea spray aerosol organic enrichment, water uptake and surface tension effects Cravigan, Luke T Mallet, Marc D Vaattovaara, Petri Harvey, Mike J Law, Cliff S Modini, Robin L Russell, Lynn M Stelcer, Ed Cohen, David D Olsen, Greg Safi, Karl Burrell, Timothy J Ristovski, Zoran 7955 - 7977 2020-01-01 https://escholarship.org/uc/item/8fj5218q unknown eScholarship, University of California qt8fj5218q https://escholarship.org/uc/item/8fj5218q CC-BY Atmospheric Chemistry and Physics, vol 20, iss 13 Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water Astronomical and Space Sciences Meteorology & Atmospheric Sciences Climate change science article 2020 ftcdlib 2023-10-09T18:06:26Z Abstract. The aerosol-driven radiative effects on marine low-level cloud represent a large uncertainty in climate simulations, in particular over the Southern Ocean, which is also an important region for sea spray aerosol production. Observations of sea spray aerosol organic enrichment and the resulting impact on water uptake over the remote Southern Hemisphere are scarce, and therefore the region is under-represented in existing parameterisations. The Surface Ocean Aerosol Production (SOAP) voyage was a 23 d voyage which sampled three phytoplankton blooms in the highly productive water of the Chatham Rise, east of New Zealand. In this study we examined the enrichment of organics to nascent sea spray aerosol and the modifications to sea spray aerosol water uptake using in situ chamber measurements of seawater samples taken during the SOAP voyage. Primary marine organics contributed up to 23 % of the sea spray mass for particles with diameter less than approximately 1 µm and up to 79 % of the particle volume for 50 nm diameter sea spray. The composition of the submicron organic fraction was consistent throughout the voyage and was largely composed of a polysaccharide-like component, characterised by very low alkane-to-hydroxyl-concentration ratios of approximately 0.1–0.2. The enrichment of organics was compared to the output from the chlorophyll-a-based sea spray aerosol parameterisation suggested by Gantt etal. (2011) and the OCEANFILMS (Organic Compounds from Ecosystems to Aerosols: Natural Films and Interfaces via Langmuir Molecular Surfactants) models. OCEANFILMS improved on the representation of the organic fraction predicted using chlorophylla, in particular when the co-adsorption of polysaccharides was included; however, the model still under-predicted the proportion of polysaccharides by an average of 33 %. Nascent 50 nm diameter sea spray aerosol hygroscopic growth factors measured at 90 % relative humidity averaged 1.93±0.08 and did not decrease with increasing sea spray aerosol organic fractions. The ... Article in Journal/Newspaper Southern Ocean University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water Astronomical and Space Sciences Meteorology & Atmospheric Sciences Climate change science |
spellingShingle |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water Astronomical and Space Sciences Meteorology & Atmospheric Sciences Climate change science Cravigan, Luke T Mallet, Marc D Vaattovaara, Petri Harvey, Mike J Law, Cliff S Modini, Robin L Russell, Lynn M Stelcer, Ed Cohen, David D Olsen, Greg Safi, Karl Burrell, Timothy J Ristovski, Zoran Sea spray aerosol organic enrichment, water uptake and surface tension effects |
topic_facet |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water Astronomical and Space Sciences Meteorology & Atmospheric Sciences Climate change science |
description |
Abstract. The aerosol-driven radiative effects on marine low-level cloud represent a large uncertainty in climate simulations, in particular over the Southern Ocean, which is also an important region for sea spray aerosol production. Observations of sea spray aerosol organic enrichment and the resulting impact on water uptake over the remote Southern Hemisphere are scarce, and therefore the region is under-represented in existing parameterisations. The Surface Ocean Aerosol Production (SOAP) voyage was a 23 d voyage which sampled three phytoplankton blooms in the highly productive water of the Chatham Rise, east of New Zealand. In this study we examined the enrichment of organics to nascent sea spray aerosol and the modifications to sea spray aerosol water uptake using in situ chamber measurements of seawater samples taken during the SOAP voyage. Primary marine organics contributed up to 23 % of the sea spray mass for particles with diameter less than approximately 1 µm and up to 79 % of the particle volume for 50 nm diameter sea spray. The composition of the submicron organic fraction was consistent throughout the voyage and was largely composed of a polysaccharide-like component, characterised by very low alkane-to-hydroxyl-concentration ratios of approximately 0.1–0.2. The enrichment of organics was compared to the output from the chlorophyll-a-based sea spray aerosol parameterisation suggested by Gantt etal. (2011) and the OCEANFILMS (Organic Compounds from Ecosystems to Aerosols: Natural Films and Interfaces via Langmuir Molecular Surfactants) models. OCEANFILMS improved on the representation of the organic fraction predicted using chlorophylla, in particular when the co-adsorption of polysaccharides was included; however, the model still under-predicted the proportion of polysaccharides by an average of 33 %. Nascent 50 nm diameter sea spray aerosol hygroscopic growth factors measured at 90 % relative humidity averaged 1.93±0.08 and did not decrease with increasing sea spray aerosol organic fractions. The ... |
format |
Article in Journal/Newspaper |
author |
Cravigan, Luke T Mallet, Marc D Vaattovaara, Petri Harvey, Mike J Law, Cliff S Modini, Robin L Russell, Lynn M Stelcer, Ed Cohen, David D Olsen, Greg Safi, Karl Burrell, Timothy J Ristovski, Zoran |
author_facet |
Cravigan, Luke T Mallet, Marc D Vaattovaara, Petri Harvey, Mike J Law, Cliff S Modini, Robin L Russell, Lynn M Stelcer, Ed Cohen, David D Olsen, Greg Safi, Karl Burrell, Timothy J Ristovski, Zoran |
author_sort |
Cravigan, Luke T |
title |
Sea spray aerosol organic enrichment, water uptake and surface tension effects |
title_short |
Sea spray aerosol organic enrichment, water uptake and surface tension effects |
title_full |
Sea spray aerosol organic enrichment, water uptake and surface tension effects |
title_fullStr |
Sea spray aerosol organic enrichment, water uptake and surface tension effects |
title_full_unstemmed |
Sea spray aerosol organic enrichment, water uptake and surface tension effects |
title_sort |
sea spray aerosol organic enrichment, water uptake and surface tension effects |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/8fj5218q |
op_coverage |
7955 - 7977 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmospheric Chemistry and Physics, vol 20, iss 13 |
op_relation |
qt8fj5218q https://escholarship.org/uc/item/8fj5218q |
op_rights |
CC-BY |
_version_ |
1781706952689057792 |