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How does sea ice influence δ18O of Arctic precipitation?

Faber, Anne Katrine; Vinther, Bo Møllesøe; Sjolte, Jesper LU and Pedersen, Rasmus Anker (2017) In Atmospheric Chemistry and Physics 17(9). p.5865-5876
Abstract

This study investigates how variations in Arctic sea ice and sea surface conditions influence δ18O of present-day Arctic precipitation. This is done using the model isoCAM3, an isotope-equipped version of the National Center for Atmospheric Research Community Atmosphere Model version 3. Four sensitivity experiments and one control simulation are performed with prescribed sea surface temperature (SST) and sea ice. Each of the four experiments simulates the atmospheric and isotopic response to Arctic oceanic conditions for selected years after the beginning of the satellite era in 1979. Changes in sea ice extent and SSTs have different impacts in Greenland and the rest of the Arctic. The simulated changes in central Arctic sea... (More)

This study investigates how variations in Arctic sea ice and sea surface conditions influence δ18O of present-day Arctic precipitation. This is done using the model isoCAM3, an isotope-equipped version of the National Center for Atmospheric Research Community Atmosphere Model version 3. Four sensitivity experiments and one control simulation are performed with prescribed sea surface temperature (SST) and sea ice. Each of the four experiments simulates the atmospheric and isotopic response to Arctic oceanic conditions for selected years after the beginning of the satellite era in 1979. Changes in sea ice extent and SSTs have different impacts in Greenland and the rest of the Arctic. The simulated changes in central Arctic sea ice do not influence δ18O of Greenland precipitation, only anomalies of Baffin Bay sea ice. However, this does not exclude the fact that simulations based on other sea ice and sea surface temperature distributions might yield changes in the δ18O of precipitation in Greenland. For the Arctic, δ18O of precipitation and water vapour is sensitive to local changes in sea ice and sea surface temperature and the changes in water vapour are surface based. Reduced sea ice extent yields more enriched isotope values, whereas increased sea ice extent yields more depleted isotope values. The distribution of the sea ice and sea surface conditions is found to be essential for the spatial distribution of the simulated changes in δ18O.

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publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
17
issue
9
pages
12 pages
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • scopus:85019201780
  • wos:000401332000002
ISSN
1680-7316
DOI
10.5194/acp-17-5865-2017
language
English
LU publication?
yes
id
3e9fda81-9e7d-4bf7-a600-bc66f169cc9d
date added to LUP
2017-05-30 09:00:31
date last changed
2018-04-01 04:32:25
@article{3e9fda81-9e7d-4bf7-a600-bc66f169cc9d,
  abstract     = {<p>This study investigates how variations in Arctic sea ice and sea surface conditions influence δ<sup>18</sup>O of present-day Arctic precipitation. This is done using the model isoCAM3, an isotope-equipped version of the National Center for Atmospheric Research Community Atmosphere Model version 3. Four sensitivity experiments and one control simulation are performed with prescribed sea surface temperature (SST) and sea ice. Each of the four experiments simulates the atmospheric and isotopic response to Arctic oceanic conditions for selected years after the beginning of the satellite era in 1979. Changes in sea ice extent and SSTs have different impacts in Greenland and the rest of the Arctic. The simulated changes in central Arctic sea ice do not influence δ<sup>18</sup>O of Greenland precipitation, only anomalies of Baffin Bay sea ice. However, this does not exclude the fact that simulations based on other sea ice and sea surface temperature distributions might yield changes in the δ<sup>18</sup>O of precipitation in Greenland. For the Arctic, δ<sup>18</sup>O of precipitation and water vapour is sensitive to local changes in sea ice and sea surface temperature and the changes in water vapour are surface based. Reduced sea ice extent yields more enriched isotope values, whereas increased sea ice extent yields more depleted isotope values. The distribution of the sea ice and sea surface conditions is found to be essential for the spatial distribution of the simulated changes in δ<sup>18</sup>O.</p>},
  author       = {Faber, Anne Katrine and Vinther, Bo Møllesøe and Sjolte, Jesper and Pedersen, Rasmus Anker},
  issn         = {1680-7316},
  language     = {eng},
  month        = {05},
  number       = {9},
  pages        = {5865--5876},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {How does sea ice influence δ<sup>18</sup>O of Arctic precipitation?},
  url          = {http://dx.doi.org/10.5194/acp-17-5865-2017},
  volume       = {17},
  year         = {2017},
}