Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model

Polar ice core water isotope records are commonly used to infer past changes in Antarctic temperature, motivating an improved understanding and quantification of the temporal relationship between δ18O and temperature. This can be achieved using simulations performed by atmospheric general circulatio...

Full description

Bibliographic Details
Published in:Climate of the Past
Main Authors: Goursaud, Sentia, Masson-Delmotte, Valérie, Favier, Vincent, Orsi, Anaïs, Werner, Martin
Format: Article in Journal/Newspaper
Language:unknown
Published: Copernicus 2018
Subjects:
Online Access:https://epic.awi.de/id/eprint/47929/
https://epic.awi.de/id/eprint/47929/1/Goursaud_CP_2018.pdf
https://doi.org/10.5194/cp-14-923-2018
https://hdl.handle.net/10013/epic.a576ed07-b39a-4786-a8c7-230ea0d0f4b9
id ftawi:oai:epic.awi.de:47929
record_format openpolar
spelling ftawi:oai:epic.awi.de:47929 2024-09-15T17:40:18+00:00 Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model Goursaud, Sentia Masson-Delmotte, Valérie Favier, Vincent Orsi, Anaïs Werner, Martin 2018-06-28 application/pdf https://epic.awi.de/id/eprint/47929/ https://epic.awi.de/id/eprint/47929/1/Goursaud_CP_2018.pdf https://doi.org/10.5194/cp-14-923-2018 https://hdl.handle.net/10013/epic.a576ed07-b39a-4786-a8c7-230ea0d0f4b9 unknown Copernicus https://epic.awi.de/id/eprint/47929/1/Goursaud_CP_2018.pdf Goursaud, S. , Masson-Delmotte, V. , Favier, V. , Orsi, A. and Werner, M. orcid:0000-0002-6473-0243 (2018) Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model , Climate of the Past, 14 (6), pp. 923-946 . doi:10.5194/cp-14-923-2018 <https://doi.org/10.5194/cp-14-923-2018> , hdl:10013/epic.a576ed07-b39a-4786-a8c7-230ea0d0f4b9 EPIC3Climate of the Past, Copernicus, 14(6), pp. 923-946, ISSN: 1814-9332 Article isiRev 2018 ftawi https://doi.org/10.5194/cp-14-923-2018 2024-06-24T04:21:00Z Polar ice core water isotope records are commonly used to infer past changes in Antarctic temperature, motivating an improved understanding and quantification of the temporal relationship between δ18O and temperature. This can be achieved using simulations performed by atmospheric general circulation models equipped with water stable isotopes. Here, we evaluate the skills of the high-resolution water-isotope-enabled atmospheric general circulation model ECHAM5-wiso (the European Centre Hamburg Model) nudged to European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis using simulations covering the period 1960–2013 over the Antarctic continent. We compare model outputs with field data, first with a focus on regional climate variables and second on water stable isotopes, using our updated dataset of water stable isotope measurements from precipitation, snow, and firn–ice core samples. ECHAM5-wiso simulates a large increase in temperature from 1978 to 1979, possibly caused by a discontinuity in the European Reanalyses (ERA) linked to the assimilation of remote sensing data starting in 1979. Although some model–data mismatches are observed, the (precipitation minus evaporation) outputs are found to be realistic products for surface mass balance. A warm model bias over central East Antarctica and a cold model bias over coastal regions explain first-order δ18O model biases by too strong isotopic depletion on coastal areas and underestimated depletion inland. At the second order, despite these biases, ECHAM5-wiso correctly captures the observed spatial patterns of deuterium excess. The results of model–data comparisons for the inter-annual δ18O standard deviation difer when using precipitation or ice core data. Further studies should explore the importance of deposition and post-deposition processes affecting ice core signals and not resolved in the model. These results build trust in the use of ECHAM5-wiso outputs to investigate the spatial, seasonal, and inter-annual δ18O–temperature relationships. We ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Climate of the Past 14 6 923 946
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description Polar ice core water isotope records are commonly used to infer past changes in Antarctic temperature, motivating an improved understanding and quantification of the temporal relationship between δ18O and temperature. This can be achieved using simulations performed by atmospheric general circulation models equipped with water stable isotopes. Here, we evaluate the skills of the high-resolution water-isotope-enabled atmospheric general circulation model ECHAM5-wiso (the European Centre Hamburg Model) nudged to European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis using simulations covering the period 1960–2013 over the Antarctic continent. We compare model outputs with field data, first with a focus on regional climate variables and second on water stable isotopes, using our updated dataset of water stable isotope measurements from precipitation, snow, and firn–ice core samples. ECHAM5-wiso simulates a large increase in temperature from 1978 to 1979, possibly caused by a discontinuity in the European Reanalyses (ERA) linked to the assimilation of remote sensing data starting in 1979. Although some model–data mismatches are observed, the (precipitation minus evaporation) outputs are found to be realistic products for surface mass balance. A warm model bias over central East Antarctica and a cold model bias over coastal regions explain first-order δ18O model biases by too strong isotopic depletion on coastal areas and underestimated depletion inland. At the second order, despite these biases, ECHAM5-wiso correctly captures the observed spatial patterns of deuterium excess. The results of model–data comparisons for the inter-annual δ18O standard deviation difer when using precipitation or ice core data. Further studies should explore the importance of deposition and post-deposition processes affecting ice core signals and not resolved in the model. These results build trust in the use of ECHAM5-wiso outputs to investigate the spatial, seasonal, and inter-annual δ18O–temperature relationships. We ...
format Article in Journal/Newspaper
author Goursaud, Sentia
Masson-Delmotte, Valérie
Favier, Vincent
Orsi, Anaïs
Werner, Martin
spellingShingle Goursaud, Sentia
Masson-Delmotte, Valérie
Favier, Vincent
Orsi, Anaïs
Werner, Martin
Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
author_facet Goursaud, Sentia
Masson-Delmotte, Valérie
Favier, Vincent
Orsi, Anaïs
Werner, Martin
author_sort Goursaud, Sentia
title Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
title_short Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
title_full Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
title_fullStr Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
title_full_unstemmed Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model
title_sort water stable isotope spatio-temporal variability in antarctica in 1960–2013: observations and simulations from the echam5-wiso atmospheric general circulation model
publisher Copernicus
publishDate 2018
url https://epic.awi.de/id/eprint/47929/
https://epic.awi.de/id/eprint/47929/1/Goursaud_CP_2018.pdf
https://doi.org/10.5194/cp-14-923-2018
https://hdl.handle.net/10013/epic.a576ed07-b39a-4786-a8c7-230ea0d0f4b9
genre Antarc*
Antarctic
Antarctica
East Antarctica
ice core
genre_facet Antarc*
Antarctic
Antarctica
East Antarctica
ice core
op_source EPIC3Climate of the Past, Copernicus, 14(6), pp. 923-946, ISSN: 1814-9332
op_relation https://epic.awi.de/id/eprint/47929/1/Goursaud_CP_2018.pdf
Goursaud, S. , Masson-Delmotte, V. , Favier, V. , Orsi, A. and Werner, M. orcid:0000-0002-6473-0243 (2018) Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model , Climate of the Past, 14 (6), pp. 923-946 . doi:10.5194/cp-14-923-2018 <https://doi.org/10.5194/cp-14-923-2018> , hdl:10013/epic.a576ed07-b39a-4786-a8c7-230ea0d0f4b9
op_doi https://doi.org/10.5194/cp-14-923-2018
container_title Climate of the Past
container_volume 14
container_issue 6
container_start_page 923
op_container_end_page 946
_version_ 1810486257397006336