Using noble gas measurements to derive air-sea process information and predict physical gas saturations
Dissolved gas distributions are important because they influence oceanic habitats and Earth's climate, yet competing controls by biology and physics make gas distributions challenging to predict. Bubble-mediated gas exchange, temperature change, and varying atmospheric pressure all push gases a...
Published in: | Geophysical Research Letters |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://doi.org/10.1002/2017GL075123 |
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ftncar:oai:drupal-site.org:articles_21151 2023-09-05T13:20:54+02:00 Using noble gas measurements to derive air-sea process information and predict physical gas saturations Hamme, Roberta C. (author) Emerson, Steven R. (author) Severinghaus, Jeffrey P. (author) Long, Matthew C. (author) Yashayaev, Igor (author) 2017-10-12 https://doi.org/10.1002/2017GL075123 en eng Geophysical Research Letters--Geophys. Res. Lett.--00948276 articles:21151 ark:/85065/d7sj1p64 doi:10.1002/2017GL075123 Copyright 2017 American Geophysical Union. article Text 2017 ftncar https://doi.org/10.1002/2017GL075123 2023-08-14T18:48:58Z Dissolved gas distributions are important because they influence oceanic habitats and Earth's climate, yet competing controls by biology and physics make gas distributions challenging to predict. Bubble-mediated gas exchange, temperature change, and varying atmospheric pressure all push gases away from equilibrium. Here we use new noble gas measurements from the Labrador Sea to demonstrate a technique to quantify physical processes. Our analysis shows that water-mass formation can be represented by a quasi steady state in which bubble fluxes and cooling push gases away from equilibrium balanced by diffusive gas exchange forcing gases toward equilibrium. We quantify the rates of these physical processes from our measurements, allowing direct comparison to gas exchange parameterizations, and predict the physically driven saturation of other gases. This technique produces predictions that reasonably match N-2/Ar observations and demonstrates that physical processes should force SF6 to be approximate to 6% more supersaturated than CFC-11 and CFC-12, impacting ventilation age calculations. Article in Journal/Newspaper Labrador Sea OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Geophysical Research Letters 44 19 9901 9909 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Dissolved gas distributions are important because they influence oceanic habitats and Earth's climate, yet competing controls by biology and physics make gas distributions challenging to predict. Bubble-mediated gas exchange, temperature change, and varying atmospheric pressure all push gases away from equilibrium. Here we use new noble gas measurements from the Labrador Sea to demonstrate a technique to quantify physical processes. Our analysis shows that water-mass formation can be represented by a quasi steady state in which bubble fluxes and cooling push gases away from equilibrium balanced by diffusive gas exchange forcing gases toward equilibrium. We quantify the rates of these physical processes from our measurements, allowing direct comparison to gas exchange parameterizations, and predict the physically driven saturation of other gases. This technique produces predictions that reasonably match N-2/Ar observations and demonstrates that physical processes should force SF6 to be approximate to 6% more supersaturated than CFC-11 and CFC-12, impacting ventilation age calculations. |
author2 |
Hamme, Roberta C. (author) Emerson, Steven R. (author) Severinghaus, Jeffrey P. (author) Long, Matthew C. (author) Yashayaev, Igor (author) |
format |
Article in Journal/Newspaper |
title |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
spellingShingle |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
title_short |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
title_full |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
title_fullStr |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
title_full_unstemmed |
Using noble gas measurements to derive air-sea process information and predict physical gas saturations |
title_sort |
using noble gas measurements to derive air-sea process information and predict physical gas saturations |
publishDate |
2017 |
url |
https://doi.org/10.1002/2017GL075123 |
genre |
Labrador Sea |
genre_facet |
Labrador Sea |
op_relation |
Geophysical Research Letters--Geophys. Res. Lett.--00948276 articles:21151 ark:/85065/d7sj1p64 doi:10.1002/2017GL075123 |
op_rights |
Copyright 2017 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2017GL075123 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
19 |
container_start_page |
9901 |
op_container_end_page |
9909 |
_version_ |
1776201514804576256 |