Implications of ice core smoothing for inferring CO2 flux variability
(2003) In Journal of Geophysical Research: Atmospheres 108(16).- Abstract
Ice core records are commonly used to infer information about past variability of CO2 fluxes. Because of processes involved in enclosing this air in ice, ice core records are a smoothed representation of the actual past atmospheric variations. As such, there is a limit to how much information ice core measurements can contain about flux variability on short timescales. With a numerical model of the firn processes we quantify this smoothing and describe how it can be reproduced with pulse response functions. We generate and make available pulse response functions for CO2 at the DE08 site on Law Dome, Antarctica. We discuss implications of the smoothing for inferring CO2 flux variability from the Law Dome... (More)
Ice core records are commonly used to infer information about past variability of CO2 fluxes. Because of processes involved in enclosing this air in ice, ice core records are a smoothed representation of the actual past atmospheric variations. As such, there is a limit to how much information ice core measurements can contain about flux variability on short timescales. With a numerical model of the firn processes we quantify this smoothing and describe how it can be reproduced with pulse response functions. We generate and make available pulse response functions for CO2 at the DE08 site on Law Dome, Antarctica. We discuss implications of the smoothing for inferring CO2 flux variability from the Law Dome ice core record. In particular we look at results from an intercomparison of terrestrial biosphere models over the twentieth century and show how much of the CO2 variability would be reflected in the Law Dome ice core record. We also smooth atmospheric δ13CO2 from a study that compared fixed and varying isotopic discrimination. We find that the impact of changing discrimination, shown previously to be large on interannual timescales, is small on the decadal scales accessible from ice core records.
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- author
- Trudinger, C. M. ; Rayner, P. J. ; Enting, I. G. ; Heimann, M. and Scholze, M. LU
- publishing date
- 2003-08-27
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Carbon cycle, Carbon dioxide, Firn, Ice core, Terrestrial
- in
- Journal of Geophysical Research: Atmospheres
- volume
- 108
- issue
- 16
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:1342332588
- ISSN
- 2169-8996
- DOI
- 10.1029/2003JD003562
- language
- English
- LU publication?
- no
- id
- 99a1599d-f969-4580-b8ea-306232b2ce96
- date added to LUP
- 2019-03-14 21:32:06
- date last changed
- 2022-01-31 18:14:55
@article{99a1599d-f969-4580-b8ea-306232b2ce96,
abstract = {{<p>Ice core records are commonly used to infer information about past variability of CO<sub>2</sub> fluxes. Because of processes involved in enclosing this air in ice, ice core records are a smoothed representation of the actual past atmospheric variations. As such, there is a limit to how much information ice core measurements can contain about flux variability on short timescales. With a numerical model of the firn processes we quantify this smoothing and describe how it can be reproduced with pulse response functions. We generate and make available pulse response functions for CO<sub>2</sub> at the DE08 site on Law Dome, Antarctica. We discuss implications of the smoothing for inferring CO<sub>2</sub> flux variability from the Law Dome ice core record. In particular we look at results from an intercomparison of terrestrial biosphere models over the twentieth century and show how much of the CO<sub>2</sub> variability would be reflected in the Law Dome ice core record. We also smooth atmospheric δ<sup>13</sup>CO<sub>2</sub> from a study that compared fixed and varying isotopic discrimination. We find that the impact of changing discrimination, shown previously to be large on interannual timescales, is small on the decadal scales accessible from ice core records.</p>}},
author = {{Trudinger, C. M. and Rayner, P. J. and Enting, I. G. and Heimann, M. and Scholze, M.}},
issn = {{2169-8996}},
keywords = {{Carbon cycle; Carbon dioxide; Firn; Ice core; Terrestrial}},
language = {{eng}},
month = {{08}},
number = {{16}},
publisher = {{Wiley-Blackwell}},
series = {{Journal of Geophysical Research: Atmospheres}},
title = {{Implications of ice core smoothing for inferring CO2 flux variability}},
url = {{http://dx.doi.org/10.1029/2003JD003562}},
doi = {{10.1029/2003JD003562}},
volume = {{108}},
year = {{2003}},
}