Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data

Amaelle Landais, Mathieu Casado, Frédéric Prié, Olivier Magand, Laurent Arnaud, Alexey Ekaykin, Jean Robert Petit, Ghislain Picard, Michel Fily, Bénédicte Minster, Alexandra Touzeau, Sentia Goursaud, Valérie Masson-Delmotte, Jean Jouzel, Anaïs Orsi

Результат исследований: Научные публикации в периодических изданияхОбзорная статья

4 Цитирования (Scopus)

Выдержка

Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40 kg.m−2.yr−1 may record a seasonal cycle at shallow depths.

Язык оригиналаанглийский
Страницы (с-по)139-150
Число страниц12
ЖурналComptes Rendus - Geoscience
Том349
Номер выпуска4
DOI
СостояниеОпубликовано - 1 июл 2017

Отпечаток

ice core
snow
isotope
accumulation rate
surface temperature
water
temperature
inversion layer
deep drilling
climate
summer
research program
dome
condensation
water vapor
isotopic composition
stratigraphy
transect
air temperature
Antarctica

Предметные области Scopus

  • Глобальные и планетарные изменения
  • Планетоведение и науки о земле (все)

Цитировать

Landais, Amaelle ; Casado, Mathieu ; Prié, Frédéric ; Magand, Olivier ; Arnaud, Laurent ; Ekaykin, Alexey ; Petit, Jean Robert ; Picard, Ghislain ; Fily, Michel ; Minster, Bénédicte ; Touzeau, Alexandra ; Goursaud, Sentia ; Masson-Delmotte, Valérie ; Jouzel, Jean ; Orsi, Anaïs. / Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data. В: Comptes Rendus - Geoscience. 2017 ; Том 349, № 4. стр. 139-150.
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abstract = "Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40 kg.m−2.yr−1 may record a seasonal cycle at shallow depths.",
keywords = "Antarctica, Ice core, Water isotopes",
author = "Amaelle Landais and Mathieu Casado and Fr{\'e}d{\'e}ric Pri{\'e} and Olivier Magand and Laurent Arnaud and Alexey Ekaykin and Petit, {Jean Robert} and Ghislain Picard and Michel Fily and B{\'e}n{\'e}dicte Minster and Alexandra Touzeau and Sentia Goursaud and Val{\'e}rie Masson-Delmotte and Jean Jouzel and Ana{\"i}s Orsi",
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Landais, A, Casado, M, Prié, F, Magand, O, Arnaud, L, Ekaykin, A, Petit, JR, Picard, G, Fily, M, Minster, B, Touzeau, A, Goursaud, S, Masson-Delmotte, V, Jouzel, J & Orsi, A 2017, 'Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data', Comptes Rendus - Geoscience, том. 349, № 4, стр. 139-150. https://doi.org/10.1016/j.crte.2017.05.003

Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data. / Landais, Amaelle; Casado, Mathieu; Prié, Frédéric; Magand, Olivier; Arnaud, Laurent; Ekaykin, Alexey; Petit, Jean Robert; Picard, Ghislain; Fily, Michel; Minster, Bénédicte; Touzeau, Alexandra; Goursaud, Sentia; Masson-Delmotte, Valérie; Jouzel, Jean; Orsi, Anaïs.

В: Comptes Rendus - Geoscience, Том 349, № 4, 01.07.2017, стр. 139-150.

Результат исследований: Научные публикации в периодических изданияхОбзорная статья

TY - JOUR

T1 - Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data

AU - Landais, Amaelle

AU - Casado, Mathieu

AU - Prié, Frédéric

AU - Magand, Olivier

AU - Arnaud, Laurent

AU - Ekaykin, Alexey

AU - Petit, Jean Robert

AU - Picard, Ghislain

AU - Fily, Michel

AU - Minster, Bénédicte

AU - Touzeau, Alexandra

AU - Goursaud, Sentia

AU - Masson-Delmotte, Valérie

AU - Jouzel, Jean

AU - Orsi, Anaïs

PY - 2017/7/1

Y1 - 2017/7/1

N2 - Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40 kg.m−2.yr−1 may record a seasonal cycle at shallow depths.

AB - Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40 kg.m−2.yr−1 may record a seasonal cycle at shallow depths.

KW - Antarctica

KW - Ice core

KW - Water isotopes

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U2 - 10.1016/j.crte.2017.05.003

DO - 10.1016/j.crte.2017.05.003

M3 - Review article

AN - SCOPUS:85026544396

VL - 349

SP - 139

EP - 150

JO - Comptes Rendus - Geoscience

JF - Comptes Rendus - Geoscience

SN - 1631-0713

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