A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr
A high-resolution marine proxy for atmospheric pCO2 is needed to clarify the phase lag between pCO2 and marine climate proxies and to provide a record of orbital-scale pCO2 variations before the oldest ice core measurement at 800 ka. Benthic δ13C data should record deep ocean carbon storage and, thu...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2010
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/5k9496bn |
id |
ftcdlib:oai:escholarship.org/ark:/13030/qt5k9496bn |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org/ark:/13030/qt5k9496bn 2023-05-15T16:39:09+02:00 A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr Lisiecki, LE n/a - n/a 2010-11-01 application/pdf https://escholarship.org/uc/item/5k9496bn unknown eScholarship, University of California qt5k9496bn https://escholarship.org/uc/item/5k9496bn public Geophysical Research Letters, vol 37, iss 21 Meteorology & Atmospheric Sciences MD Multidisciplinary article 2010 ftcdlib 2021-06-21T17:05:28Z A high-resolution marine proxy for atmospheric pCO2 is needed to clarify the phase lag between pCO2 and marine climate proxies and to provide a record of orbital-scale pCO2 variations before the oldest ice core measurement at 800 ka. Benthic δ13C data should record deep ocean carbon storage and, thus, atmospheric pCO2. This study finds that a modified δ13C gradient between the deep Pacific and intermediate North Atlantic (δ13CP- NA/2 correlates well with pCO2. δ13CP-NA/2 reproduces characteristic differences between pCO2 and ice volume during Late Pleistocene glaciations and indicates that pCO2 usually leads terminations by 0.2-3.7 kyr but lags by 3-10 kyr during two "failed" terminations at 535 and 745 ka. δ13C P- NA/2 gradually transitions from 41- to 100-kyr cyclicity from 1.3-0.7 Ma but has no secular trend in mean or amplitude since 1.5 Ma. The minimum pCO2 of the last 1.5 Myr is estimated to be 155 ppm at ∼920 ka. © 2010 by the American Geophysical Union. Article in Journal/Newspaper ice core North Atlantic University of California: eScholarship Pacific |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences MD Multidisciplinary |
spellingShingle |
Meteorology & Atmospheric Sciences MD Multidisciplinary Lisiecki, LE A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
topic_facet |
Meteorology & Atmospheric Sciences MD Multidisciplinary |
description |
A high-resolution marine proxy for atmospheric pCO2 is needed to clarify the phase lag between pCO2 and marine climate proxies and to provide a record of orbital-scale pCO2 variations before the oldest ice core measurement at 800 ka. Benthic δ13C data should record deep ocean carbon storage and, thus, atmospheric pCO2. This study finds that a modified δ13C gradient between the deep Pacific and intermediate North Atlantic (δ13CP- NA/2 correlates well with pCO2. δ13CP-NA/2 reproduces characteristic differences between pCO2 and ice volume during Late Pleistocene glaciations and indicates that pCO2 usually leads terminations by 0.2-3.7 kyr but lags by 3-10 kyr during two "failed" terminations at 535 and 745 ka. δ13C P- NA/2 gradually transitions from 41- to 100-kyr cyclicity from 1.3-0.7 Ma but has no secular trend in mean or amplitude since 1.5 Ma. The minimum pCO2 of the last 1.5 Myr is estimated to be 155 ppm at ∼920 ka. © 2010 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Lisiecki, LE |
author_facet |
Lisiecki, LE |
author_sort |
Lisiecki, LE |
title |
A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
title_short |
A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
title_full |
A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
title_fullStr |
A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
title_full_unstemmed |
A benthic δ13C-based proxy for atmospheric pCO2 over the last 1.5 Myr |
title_sort |
benthic δ13c-based proxy for atmospheric pco2 over the last 1.5 myr |
publisher |
eScholarship, University of California |
publishDate |
2010 |
url |
https://escholarship.org/uc/item/5k9496bn |
op_coverage |
n/a - n/a |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
ice core North Atlantic |
genre_facet |
ice core North Atlantic |
op_source |
Geophysical Research Letters, vol 37, iss 21 |
op_relation |
qt5k9496bn https://escholarship.org/uc/item/5k9496bn |
op_rights |
public |
_version_ |
1766029481241214976 |