An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica
Abstract. In 2013, an ice core was recovered from Roosevelt Island in the Ross Sea, Antarctica, as part of the Roosevelt Island Climate Evolution (RICE) project. Roosevelt Island is located between two submarine troughs carved by paleo-ice-streams. The RICE ice core provides new important informatio...
Main Authors: | , , , , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2018
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/9wh9h89r https://escholarship.org/content/qt9wh9h89r/qt9wh9h89r.pdf https://doi.org/10.5194/cp-2018-68 |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt9wh9h89r |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt9wh9h89r 2024-09-09T19:02:42+00:00 An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica Lee, James E Brook, Edward J Bertler, Nancy AN Buizert, Christo Baisden, Troy Blunier, Thomas Ciobanu, V Gabriela Conway, Howard Dahl-Jensen, Dorthe Fudge, Tyler J Hindmarsh, Richard Keller, Elizabeth D Parrenin, Frédéric Severinghaus, Jeffrey P Vallelonga, Paul Waddington, Edwin D Winstrup, Mai 2018-06-26 application/pdf https://escholarship.org/uc/item/9wh9h89r https://escholarship.org/content/qt9wh9h89r/qt9wh9h89r.pdf https://doi.org/10.5194/cp-2018-68 unknown eScholarship, University of California qt9wh9h89r https://escholarship.org/uc/item/9wh9h89r https://escholarship.org/content/qt9wh9h89r/qt9wh9h89r.pdf doi:10.5194/cp-2018-68 public Climate Action article 2018 ftcdlib https://doi.org/10.5194/cp-2018-68 2024-06-28T06:28:20Z Abstract. In 2013, an ice core was recovered from Roosevelt Island in the Ross Sea, Antarctica, as part of the Roosevelt Island Climate Evolution (RICE) project. Roosevelt Island is located between two submarine troughs carved by paleo-ice-streams. The RICE ice core provides new important information about the past configuration of the West Antarctic Ice Sheet and its retreat during the most recent deglaciation. In this work, we present the RICE17 chronology and discuss preliminary observations from the new records of methane, the isotopic composition of atmospheric molecular oxygen (δ18O-Oatm), the isotopic composition of atmospheric molecular nitrogen (δ15N-N2) and total air content (TAC). RICE17 is a composite chronology combining annual layer interpretations, gas synchronization, and firn modeling strategies in different sections of the core. An automated matching algorithm is developed for synchronizing the high-resolution section of the RICE gas records (60–720 m, 1971 CE to 30 ka) to corresponding records from the WAIS Divide ice core, while deeper sections are manually matched. Ice age for the top 343 m (2635 yr BP, before 1950 C.E.) is derived from annual layer interpretations and described in the accompanying paper by Winstrup et al. (2017). For deeper sections, the RICE17 ice age scale is based on the gas age constraints and the ice age-gas age offset estimated by a firn densification model. Novel aspects of this work include: 1) stratigraphic matching of centennial-scale variations in methane for pre-anthropogenic time periods, a strategy which will be applicable for developing precise chronologies for future ice cores, 2) the observation of centennial-scale variability in methane throughout the Holocene which suggests that similar variations during the late preindustrial period need not be anthropogenic, and 3) the observation of continuous climate records dating back to ∼ 65 ka which provide evidence that the Roosevelt Island Ice Dome was a constant feature throughout the last glacial period. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Ice Sheet Roosevelt Island Ross Sea University of California: eScholarship Antarctic Ross Sea West Antarctic Ice Sheet Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action |
spellingShingle |
Climate Action Lee, James E Brook, Edward J Bertler, Nancy AN Buizert, Christo Baisden, Troy Blunier, Thomas Ciobanu, V Gabriela Conway, Howard Dahl-Jensen, Dorthe Fudge, Tyler J Hindmarsh, Richard Keller, Elizabeth D Parrenin, Frédéric Severinghaus, Jeffrey P Vallelonga, Paul Waddington, Edwin D Winstrup, Mai An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
topic_facet |
Climate Action |
description |
Abstract. In 2013, an ice core was recovered from Roosevelt Island in the Ross Sea, Antarctica, as part of the Roosevelt Island Climate Evolution (RICE) project. Roosevelt Island is located between two submarine troughs carved by paleo-ice-streams. The RICE ice core provides new important information about the past configuration of the West Antarctic Ice Sheet and its retreat during the most recent deglaciation. In this work, we present the RICE17 chronology and discuss preliminary observations from the new records of methane, the isotopic composition of atmospheric molecular oxygen (δ18O-Oatm), the isotopic composition of atmospheric molecular nitrogen (δ15N-N2) and total air content (TAC). RICE17 is a composite chronology combining annual layer interpretations, gas synchronization, and firn modeling strategies in different sections of the core. An automated matching algorithm is developed for synchronizing the high-resolution section of the RICE gas records (60–720 m, 1971 CE to 30 ka) to corresponding records from the WAIS Divide ice core, while deeper sections are manually matched. Ice age for the top 343 m (2635 yr BP, before 1950 C.E.) is derived from annual layer interpretations and described in the accompanying paper by Winstrup et al. (2017). For deeper sections, the RICE17 ice age scale is based on the gas age constraints and the ice age-gas age offset estimated by a firn densification model. Novel aspects of this work include: 1) stratigraphic matching of centennial-scale variations in methane for pre-anthropogenic time periods, a strategy which will be applicable for developing precise chronologies for future ice cores, 2) the observation of centennial-scale variability in methane throughout the Holocene which suggests that similar variations during the late preindustrial period need not be anthropogenic, and 3) the observation of continuous climate records dating back to ∼ 65 ka which provide evidence that the Roosevelt Island Ice Dome was a constant feature throughout the last glacial period. |
format |
Article in Journal/Newspaper |
author |
Lee, James E Brook, Edward J Bertler, Nancy AN Buizert, Christo Baisden, Troy Blunier, Thomas Ciobanu, V Gabriela Conway, Howard Dahl-Jensen, Dorthe Fudge, Tyler J Hindmarsh, Richard Keller, Elizabeth D Parrenin, Frédéric Severinghaus, Jeffrey P Vallelonga, Paul Waddington, Edwin D Winstrup, Mai |
author_facet |
Lee, James E Brook, Edward J Bertler, Nancy AN Buizert, Christo Baisden, Troy Blunier, Thomas Ciobanu, V Gabriela Conway, Howard Dahl-Jensen, Dorthe Fudge, Tyler J Hindmarsh, Richard Keller, Elizabeth D Parrenin, Frédéric Severinghaus, Jeffrey P Vallelonga, Paul Waddington, Edwin D Winstrup, Mai |
author_sort |
Lee, James E |
title |
An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
title_short |
An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
title_full |
An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
title_fullStr |
An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
title_full_unstemmed |
An 83 000 year old ice core from Roosevelt Island, Ross Sea, Antarctica |
title_sort |
83 000 year old ice core from roosevelt island, ross sea, antarctica |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/9wh9h89r https://escholarship.org/content/qt9wh9h89r/qt9wh9h89r.pdf https://doi.org/10.5194/cp-2018-68 |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) ENVELOPE(-162.000,-162.000,-79.283,-79.283) |
geographic |
Antarctic Ross Sea West Antarctic Ice Sheet Tac Roosevelt Island |
geographic_facet |
Antarctic Ross Sea West Antarctic Ice Sheet Tac Roosevelt Island |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet Roosevelt Island Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet Roosevelt Island Ross Sea |
op_relation |
qt9wh9h89r https://escholarship.org/uc/item/9wh9h89r https://escholarship.org/content/qt9wh9h89r/qt9wh9h89r.pdf doi:10.5194/cp-2018-68 |
op_rights |
public |
op_doi |
https://doi.org/10.5194/cp-2018-68 |
_version_ |
1809816740141465600 |