Distribution and drivers of marine isoprene concentration across the Southern Ocean
© 2020 by the authors. Isoprene is a biogenic trace gas produced by terrestrial vegetation and marine phytoplankton. In the remote oceans, where secondary aerosols are mostly biogenic, marine isoprene emissions affect atmospheric chemistry and influence cloud formation and brightness. Here, we prese...
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/80197 2023-06-11T04:16:56+02:00 Distribution and drivers of marine isoprene concentration across the Southern Ocean Rodríguez-Ros, P. Cortés, P. Robinson, Charlotte Nunes, S. Hassler, C. Royer, S.J. Estrada, M. Sala, M.M. Simó, R. 2020 fulltext https://hdl.handle.net/20.500.11937/80197 https://doi.org/10.3390/atmos11060556 unknown http://purl.org/au-research/grants/arc/DP160103387 http://hdl.handle.net/20.500.11937/80197 doi:10.3390/atmos11060556 http://creativecommons.org/licenses/by/4.0/ Journal Article 2020 ftcurtin https://doi.org/20.500.11937/8019710.3390/atmos11060556 2023-05-30T19:58:05Z © 2020 by the authors. Isoprene is a biogenic trace gas produced by terrestrial vegetation and marine phytoplankton. In the remote oceans, where secondary aerosols are mostly biogenic, marine isoprene emissions affect atmospheric chemistry and influence cloud formation and brightness. Here, we present the first compilation of new and published measurements of isoprene concentrations in the Southern Ocean and explore their distribution patterns. Surface ocean isoprene concentrations in November through April span 1 to 94 pM. A band of higher concentrations is observed around a latitude of ≈40° S and a surface sea temperature of 15 °C. High isoprene also occurs in high productivity waters near islands and continental coasts. We use concurrent measurements of physical, chemical, and biological variables to explore the main potential drivers of isoprene concentration by means of paired regressions and multivariate analysis. Isoprene is best explained by phytoplankton-related variables like the concentrations of chlorophyll-a, photoprotective pigments and particulate organic matter, photosynthetic efficiency (influenced by iron availability), and the chlorophyll-a shares of most phytoplankton groups, and not by macronutrients or bacterial abundance. A simple statistical model based on chlorophyll-a concentration and a sea surface temperature discontinuity accounts for half of the variance of isoprene concentrations in surface waters of the Southern Ocean. Article in Journal/Newspaper Southern Ocean Curtin University: espace Near Islands ENVELOPE(173.132,173.132,52.801,52.801) Southern Ocean Atmosphere 11 6 556 |
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description |
© 2020 by the authors. Isoprene is a biogenic trace gas produced by terrestrial vegetation and marine phytoplankton. In the remote oceans, where secondary aerosols are mostly biogenic, marine isoprene emissions affect atmospheric chemistry and influence cloud formation and brightness. Here, we present the first compilation of new and published measurements of isoprene concentrations in the Southern Ocean and explore their distribution patterns. Surface ocean isoprene concentrations in November through April span 1 to 94 pM. A band of higher concentrations is observed around a latitude of ≈40° S and a surface sea temperature of 15 °C. High isoprene also occurs in high productivity waters near islands and continental coasts. We use concurrent measurements of physical, chemical, and biological variables to explore the main potential drivers of isoprene concentration by means of paired regressions and multivariate analysis. Isoprene is best explained by phytoplankton-related variables like the concentrations of chlorophyll-a, photoprotective pigments and particulate organic matter, photosynthetic efficiency (influenced by iron availability), and the chlorophyll-a shares of most phytoplankton groups, and not by macronutrients or bacterial abundance. A simple statistical model based on chlorophyll-a concentration and a sea surface temperature discontinuity accounts for half of the variance of isoprene concentrations in surface waters of the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Rodríguez-Ros, P. Cortés, P. Robinson, Charlotte Nunes, S. Hassler, C. Royer, S.J. Estrada, M. Sala, M.M. Simó, R. |
spellingShingle |
Rodríguez-Ros, P. Cortés, P. Robinson, Charlotte Nunes, S. Hassler, C. Royer, S.J. Estrada, M. Sala, M.M. Simó, R. Distribution and drivers of marine isoprene concentration across the Southern Ocean |
author_facet |
Rodríguez-Ros, P. Cortés, P. Robinson, Charlotte Nunes, S. Hassler, C. Royer, S.J. Estrada, M. Sala, M.M. Simó, R. |
author_sort |
Rodríguez-Ros, P. |
title |
Distribution and drivers of marine isoprene concentration across the Southern Ocean |
title_short |
Distribution and drivers of marine isoprene concentration across the Southern Ocean |
title_full |
Distribution and drivers of marine isoprene concentration across the Southern Ocean |
title_fullStr |
Distribution and drivers of marine isoprene concentration across the Southern Ocean |
title_full_unstemmed |
Distribution and drivers of marine isoprene concentration across the Southern Ocean |
title_sort |
distribution and drivers of marine isoprene concentration across the southern ocean |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11937/80197 https://doi.org/10.3390/atmos11060556 |
long_lat |
ENVELOPE(173.132,173.132,52.801,52.801) |
geographic |
Near Islands Southern Ocean |
geographic_facet |
Near Islands Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://purl.org/au-research/grants/arc/DP160103387 http://hdl.handle.net/20.500.11937/80197 doi:10.3390/atmos11060556 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/20.500.11937/8019710.3390/atmos11060556 |
container_title |
Atmosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
556 |
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1768375653028069376 |