Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ18O gradients with possible Heinrich event imprint

Inger Kathrine Seierstad; Peter M. Abbott; Matthias Bigler; Thomas Blunier; Anna J. Bourne; Edward Brook; Susanne Lilja Buchardt; Christo Buizert; Henrik Brink Clausen; Eliza Cook; Dorthe Dahl-Jensen; Siwan M. Davies; Myriam Guillevic; Sigfus Johann Johnsen; Desirée S. Pedersen; Trevor James Popp; Sune Olander Rasmussen; Jeffrey P. Severinghaus; Anders Svensson; Bo Møllesøe Vinther

doi:10.1016/j.quascirev.2014.10.032

Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ¹⁸O gradients with possible Heinrich event imprint

Inger Kathrine Seierstad, Peter M. Abbott, Matthias Bigler, Thomas Blunier, Anna J. Bourne, Edward Brook, Susanne Lilja Buchardt, Christo Buizert, Henrik Brink Clausen, Eliza Cook, Dorthe Dahl-Jensen, Siwan M. Davies, Myriam Guillevic, Sigfus Johann Johnsen, Desirée S. Pedersen, Trevor James Popp, Sune Olander Rasmussen, Jeffrey P. Severinghaus, Anders Svensson, Bo Møllesøe Vinther

Is-, Klima- og Geofysik

157 Citationer (Scopus)

Abstract

Abstract We present a synchronization of the NGRIP, GRIP and GISP2 ice cores onto a master chronology extending back to 104 ka before present, providing a consistent chronological framework for these three Greenland records. The synchronization aligns distinct peaks in volcanic proxy records and other impurity records (chemo-stratigraphic matching) and assumes that these layers of elevated impurity content represent the same, instantaneous event in the past at all three sites. More than 900 marker horizons between the three cores have been identified and our matching is independently confirmed by 24 new and previously identified volcanic ash (tephra) tie-points. Using the reference horizons, we transfer the widely used Greenland ice-core chronology, GICC05modelext, to the two Summit cores, GRIP and GISP2. Furthermore, we provide gas chronologies for the Summit cores that are consistent with the GICC05modelext timescale by utilizing both existing and new gas data (CH4 concentration and δ15N of N2). We infer that the accumulation contrast between the stadial and interstadial phases of the glacial period was ∼10% greater at Summit compared to at NGRIP. The δ18O temperature-proxy records from NGRIP, GRIP, and GISP2 are generally very similar and display synchronous behaviour at climate transitions. The δ18O differences between Summit and NGRIP, however, changed slowly over the Last Glacial–Interglacial cycle and also underwent abrupt millennial-to-centennial-scale variations. We suggest that this observed latitudinal δ18O gradient in Greenland during the glacial period is the result of 1) relatively higher degree of precipitation with a Pacific signature at NGRIP, 2) increased summer bias in precipitation at Summit, and 3) enhanced Rayleigh distillation due to an increased source-to-site distance and a potentially larger source-to-site temperature gradient. We propose that these processes are governed by changes in the North American Ice Sheet (NAIS) volume and North Atlantic sea-ice extent and/or sea-surface temperatures (SST) on orbital timescales, and that changing sea-ice extent and SSTs are the driving mechanisms on shorter timescales. Finally, we observe that maxima in the Summit–NGRIP δ18O difference are roughly coincident with prominent Heinrich events. This suggests that the climatic reorganization that takes place during stadials with Heinrich events, possibly driven by a southward expansion of sea ice and low SSTs in the North Atlantic, are recorded in the ice-core records.

Originalsprog	Engelsk
Tidsskrift	Quaternary Science Reviews
Vol/bind	106
Sider (fra-til)	29-46
Antal sider	18
ISSN	0277-3791
DOI	https://doi.org/10.1016/j.quascirev.2014.10.032
Status	Udgivet - 15 dec. 2014

Emneord

Paleoclimate
Greenland ice cores
GICC05 chronology
Tephra isochrons
Regional climate
Water isotopes (δ18O)
Heinrich event

FN’s Verdensmål

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Adgang til dokumentet

10.1016/j.quascirev.2014.10.032

http://www.sciencedirect.com/science/article/pii/S027737911400434X

Citationsformater

Seierstad, I. K., Abbott, P. M., Bigler, M., Blunier, T., Bourne, A. J., Brook, E., Buchardt, S. L., Buizert, C., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Johnsen, S. J., Pedersen, D. S., Popp, T. J., Rasmussen, S. O., Severinghaus, J. P., Svensson, A., & Vinther, B. M. (2014). Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ¹⁸O gradients with possible Heinrich event imprint. Quaternary Science Reviews, 106, 29-46. https://doi.org/10.1016/j.quascirev.2014.10.032

Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ¹⁸O gradients with possible Heinrich event imprint. / Seierstad, Inger Kathrine; Abbott, Peter M.; Bigler, Matthias et al.

I: Quaternary Science Reviews, Bind 106, 15.12.2014, s. 29-46.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

Seierstad, IK, Abbott, PM, Bigler, M, Blunier, T, Bourne, AJ, Brook, E, Buchardt, SL, Buizert, C, Clausen, HB, Cook, E, Dahl-Jensen, D, Davies, SM, Guillevic, M, Johnsen, SJ, Pedersen, DS, Popp, TJ, Rasmussen, SO, Severinghaus, JP, Svensson, A & Vinther, BM 2014, 'Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ¹⁸O gradients with possible Heinrich event imprint', Quaternary Science Reviews, bind 106, s. 29-46. https://doi.org/10.1016/j.quascirev.2014.10.032

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title = "Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ18O gradients with possible Heinrich event imprint",

abstract = "We present a synchronization of the NGRIP, GRIP and GISP2 ice cores onto a master chronology extending back to 104ka before present, providing a consistent chronological framework for these three Greenland records. The synchronization aligns distinct peaks in volcanic proxy records and other impurity records (chemo-stratigraphic matching) and assumes that these layers of elevated impurity content represent the same, instantaneous event in the past at all three sites. More than 900 marker horizons between the three cores have been identified and our matching is independently confirmed by 24 new and previously identified volcanic ash (tephra) tie-points. Using the reference horizons, we transfer the widely used Greenland ice-core chronology, GICC05modelext, to the two Summit cores, GRIP and GISP2. Furthermore, we provide gas chronologies for the Summit cores that are consistent with the GICC05modelext timescale by utilizing both existing and new gas data (CH4 concentration and δ15N of N2). We infer that the accumulation contrast between the stadial and interstadial phases of the glacial period was ~10% greater at Summit compared to at NGRIP. The δ18O temperature-proxy records from NGRIP, GRIP, and GISP2 are generally very similar and display synchronous behaviour at climate transitions. The δ18O differences between Summit and NGRIP, however, changed slowly over the Last Glacial-Interglacial cycle and also underwent abrupt millennial-to-centennial-scale variations. We suggest that this observed latitudinal δ18O gradient in Greenland during the glacial period is the result of 1) relatively higher degree of precipitation with a Pacific signature at NGRIP, 2) increased summer bias in precipitation at Summit, and 3) enhanced Rayleigh distillation due to an increased source-to-site distance and a potentially larger source-to-site temperature gradient. We propose that these processes are governed by changes in the North American Ice Sheet (NAIS) volume and North Atlantic sea-ice extent and/or sea-surface temperatures (SST) on orbital timescales, and that changing sea-ice extent and SSTs are the driving mechanisms on shorter timescales. Finally, we observe that maxima in the Summit-NGRIP δ18O difference are roughly coincident with prominent Heinrich events. This suggests that the climatic reorganization that takes place during stadials with Heinrich events, possibly driven by a southward expansion of sea ice and low SSTs in the North Atlantic, are recorded in the ice-core records.",

keywords = "Paleoclimate, Greenland ice cores, GICC05 chronology, Tephra isochrons, Regional climate, Water isotopes (δ18O), Heinrich event",

author = "Seierstad, {Inger Kathrine} and Abbott, {Peter M.} and Matthias Bigler and Thomas Blunier and Bourne, {Anna J.} and Edward Brook and Buchardt, {Susanne Lilja} and Christo Buizert and Clausen, {Henrik Brink} and Eliza Cook and Dorthe Dahl-Jensen and Davies, {Siwan M.} and Myriam Guillevic and Johnsen, {Sigfus Johann} and Pedersen, {Desir{\'e}e S.} and Popp, {Trevor James} and Rasmussen, {Sune Olander} and Severinghaus, {Jeffrey P.} and Anders Svensson and Vinther, {Bo M{\o}lles{\o}e}",

note = "Dating, Synthesis, and Interpretation of Palaeoclimatic Records and Model-data Integration: Advances of the INTIMATE project(INTegration of Ice core, Marine and TErrestrial records, COST Action ES0907)",

year = "2014",

month = dec,

day = "15",

doi = "10.1016/j.quascirev.2014.10.032",

language = "English",

volume = "106",

pages = "29--46",

journal = "Quaternary Science Reviews",

issn = "0277-3791",

publisher = "Pergamon Press",

}

TY - JOUR

T1 - Consistently dated records from the Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ18O gradients with possible Heinrich event imprint

AU - Seierstad, Inger Kathrine

AU - Abbott, Peter M.

AU - Bigler, Matthias

AU - Blunier, Thomas

AU - Bourne, Anna J.

AU - Brook, Edward

AU - Buchardt, Susanne Lilja

AU - Buizert, Christo

AU - Clausen, Henrik Brink

AU - Cook, Eliza

AU - Dahl-Jensen, Dorthe

AU - Davies, Siwan M.

AU - Guillevic, Myriam

AU - Johnsen, Sigfus Johann

AU - Pedersen, Desirée S.

AU - Popp, Trevor James

AU - Rasmussen, Sune Olander

AU - Severinghaus, Jeffrey P.

AU - Svensson, Anders

AU - Vinther, Bo Møllesøe

N1 - Dating, Synthesis, and Interpretation of Palaeoclimatic Records and Model-data Integration: Advances of the INTIMATE project(INTegration of Ice core, Marine and TErrestrial records, COST Action ES0907)

PY - 2014/12/15

Y1 - 2014/12/15

N2 - We present a synchronization of the NGRIP, GRIP and GISP2 ice cores onto a master chronology extending back to 104ka before present, providing a consistent chronological framework for these three Greenland records. The synchronization aligns distinct peaks in volcanic proxy records and other impurity records (chemo-stratigraphic matching) and assumes that these layers of elevated impurity content represent the same, instantaneous event in the past at all three sites. More than 900 marker horizons between the three cores have been identified and our matching is independently confirmed by 24 new and previously identified volcanic ash (tephra) tie-points. Using the reference horizons, we transfer the widely used Greenland ice-core chronology, GICC05modelext, to the two Summit cores, GRIP and GISP2. Furthermore, we provide gas chronologies for the Summit cores that are consistent with the GICC05modelext timescale by utilizing both existing and new gas data (CH4 concentration and δ15N of N2). We infer that the accumulation contrast between the stadial and interstadial phases of the glacial period was ~10% greater at Summit compared to at NGRIP. The δ18O temperature-proxy records from NGRIP, GRIP, and GISP2 are generally very similar and display synchronous behaviour at climate transitions. The δ18O differences between Summit and NGRIP, however, changed slowly over the Last Glacial-Interglacial cycle and also underwent abrupt millennial-to-centennial-scale variations. We suggest that this observed latitudinal δ18O gradient in Greenland during the glacial period is the result of 1) relatively higher degree of precipitation with a Pacific signature at NGRIP, 2) increased summer bias in precipitation at Summit, and 3) enhanced Rayleigh distillation due to an increased source-to-site distance and a potentially larger source-to-site temperature gradient. We propose that these processes are governed by changes in the North American Ice Sheet (NAIS) volume and North Atlantic sea-ice extent and/or sea-surface temperatures (SST) on orbital timescales, and that changing sea-ice extent and SSTs are the driving mechanisms on shorter timescales. Finally, we observe that maxima in the Summit-NGRIP δ18O difference are roughly coincident with prominent Heinrich events. This suggests that the climatic reorganization that takes place during stadials with Heinrich events, possibly driven by a southward expansion of sea ice and low SSTs in the North Atlantic, are recorded in the ice-core records.

AB - We present a synchronization of the NGRIP, GRIP and GISP2 ice cores onto a master chronology extending back to 104ka before present, providing a consistent chronological framework for these three Greenland records. The synchronization aligns distinct peaks in volcanic proxy records and other impurity records (chemo-stratigraphic matching) and assumes that these layers of elevated impurity content represent the same, instantaneous event in the past at all three sites. More than 900 marker horizons between the three cores have been identified and our matching is independently confirmed by 24 new and previously identified volcanic ash (tephra) tie-points. Using the reference horizons, we transfer the widely used Greenland ice-core chronology, GICC05modelext, to the two Summit cores, GRIP and GISP2. Furthermore, we provide gas chronologies for the Summit cores that are consistent with the GICC05modelext timescale by utilizing both existing and new gas data (CH4 concentration and δ15N of N2). We infer that the accumulation contrast between the stadial and interstadial phases of the glacial period was ~10% greater at Summit compared to at NGRIP. The δ18O temperature-proxy records from NGRIP, GRIP, and GISP2 are generally very similar and display synchronous behaviour at climate transitions. The δ18O differences between Summit and NGRIP, however, changed slowly over the Last Glacial-Interglacial cycle and also underwent abrupt millennial-to-centennial-scale variations. We suggest that this observed latitudinal δ18O gradient in Greenland during the glacial period is the result of 1) relatively higher degree of precipitation with a Pacific signature at NGRIP, 2) increased summer bias in precipitation at Summit, and 3) enhanced Rayleigh distillation due to an increased source-to-site distance and a potentially larger source-to-site temperature gradient. We propose that these processes are governed by changes in the North American Ice Sheet (NAIS) volume and North Atlantic sea-ice extent and/or sea-surface temperatures (SST) on orbital timescales, and that changing sea-ice extent and SSTs are the driving mechanisms on shorter timescales. Finally, we observe that maxima in the Summit-NGRIP δ18O difference are roughly coincident with prominent Heinrich events. This suggests that the climatic reorganization that takes place during stadials with Heinrich events, possibly driven by a southward expansion of sea ice and low SSTs in the North Atlantic, are recorded in the ice-core records.

KW - Paleoclimate

KW - Greenland ice cores

KW - GICC05 chronology

KW - Tephra isochrons

KW - Regional climate

KW - Water isotopes (δ18O)

KW - Heinrich event

U2 - 10.1016/j.quascirev.2014.10.032

DO - 10.1016/j.quascirev.2014.10.032

M3 - Journal article

SN - 0277-3791

VL - 106

SP - 29

EP - 46

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

ER -