Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions
Abstract. This study uses the simplified patterns of temperature and effective precipitation approach from the Australian component of the international palaeoclimate synthesis effort (INTegration of Ice core, MArine and TErrestrial records – OZ-INTIMATE) to compare atmosphere–ocean general circulat...
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Copernicus GmbH
2017
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Online Access: | http://hdl.handle.net/1959.4/unsworks_76599 https://unsworks.unsw.edu.au/bitstreams/9e59a8fc-1ee1-48c9-92a6-e843263c1671/download https://doi.org/10.5194/cp-13-1661-2017 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_76599 2024-05-19T07:42:02+00:00 Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions Ackerley, Duncan Reeves, Jessica Barr, Cameron Bostock, Helen Fitzsimmons, Kathryn Fletcher, Michael-Shawn Gouramanis, Chris McGregor, Helen Mooney, Scott Phipps, Steven J Tibby, John Tyler, Jonathan 2017-11-24 application/pdf http://hdl.handle.net/1959.4/unsworks_76599 https://unsworks.unsw.edu.au/bitstreams/9e59a8fc-1ee1-48c9-92a6-e843263c1671/download https://doi.org/10.5194/cp-13-1661-2017 unknown Copernicus GmbH http://hdl.handle.net/1959.4/unsworks_76599 https://unsworks.unsw.edu.au/bitstreams/9e59a8fc-1ee1-48c9-92a6-e843263c1671/download https://doi.org/10.5194/cp-13-1661-2017 open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read urn:ISSN:1814-9332 Climate of the Past, 13, 11, 1661-1684 anzsrc-for: 0406 Physical Geography and Environmental Geoscience journal article http://purl.org/coar/resource_type/c_6501 2017 ftunswworks https://doi.org/10.5194/cp-13-1661-2017 2024-04-24T01:19:13Z Abstract. This study uses the simplified patterns of temperature and effective precipitation approach from the Australian component of the international palaeoclimate synthesis effort (INTegration of Ice core, MArine and TErrestrial records – OZ-INTIMATE) to compare atmosphere–ocean general circulation model (AOGCM) simulations and proxy reconstructions. The approach is used in order to identify important properties (e.g. circulation and precipitation) of past climatic states from the models and proxies, which is a primary objective of the Southern Hemisphere Assessment of PalaeoEnvironment (SHAPE) initiative. The AOGCM data are taken from the Paleoclimate Modelling Intercomparison Project (PMIP) mid-Holocene (ca. 6000 years before present, 6 ka) and pre-industrial control (ca. 1750 CE, 0 ka) experiments. The synthesis presented here shows that the models and proxies agree on the differences in climate state for 6 ka relative to 0 ka, when they are insolation driven. The largest uncertainty between the models and the proxies occurs over the Indo-Pacific Warm Pool (IPWP). The analysis shows that the lower temperatures in the Pacific at around 6 ka in the models may be the result of an enhancement of an existing systematic error. It is therefore difficult to decipher which one of the proxies and/or the models is correct. This study also shows that a reduction in the Equator-to-pole temperature difference in the Southern Hemisphere causes the mid-latitude westerly wind strength to reduce in the models; however, the simulated rainfall actually increases over the southern temperate zone of Australia as a result of higher convective precipitation. Such a mechanism (increased convection) may be useful for resolving disparities between different regional proxy records and model simulations. Finally, after assessing the available datasets (model and proxy), opportunities for better model–proxy integrated research are discussed. Article in Journal/Newspaper ice core Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Climate of the Past 13 11 1661 1684 |
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Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
spellingShingle |
anzsrc-for: 0406 Physical Geography and Environmental Geoscience Ackerley, Duncan Reeves, Jessica Barr, Cameron Bostock, Helen Fitzsimmons, Kathryn Fletcher, Michael-Shawn Gouramanis, Chris McGregor, Helen Mooney, Scott Phipps, Steven J Tibby, John Tyler, Jonathan Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
topic_facet |
anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
description |
Abstract. This study uses the simplified patterns of temperature and effective precipitation approach from the Australian component of the international palaeoclimate synthesis effort (INTegration of Ice core, MArine and TErrestrial records – OZ-INTIMATE) to compare atmosphere–ocean general circulation model (AOGCM) simulations and proxy reconstructions. The approach is used in order to identify important properties (e.g. circulation and precipitation) of past climatic states from the models and proxies, which is a primary objective of the Southern Hemisphere Assessment of PalaeoEnvironment (SHAPE) initiative. The AOGCM data are taken from the Paleoclimate Modelling Intercomparison Project (PMIP) mid-Holocene (ca. 6000 years before present, 6 ka) and pre-industrial control (ca. 1750 CE, 0 ka) experiments. The synthesis presented here shows that the models and proxies agree on the differences in climate state for 6 ka relative to 0 ka, when they are insolation driven. The largest uncertainty between the models and the proxies occurs over the Indo-Pacific Warm Pool (IPWP). The analysis shows that the lower temperatures in the Pacific at around 6 ka in the models may be the result of an enhancement of an existing systematic error. It is therefore difficult to decipher which one of the proxies and/or the models is correct. This study also shows that a reduction in the Equator-to-pole temperature difference in the Southern Hemisphere causes the mid-latitude westerly wind strength to reduce in the models; however, the simulated rainfall actually increases over the southern temperate zone of Australia as a result of higher convective precipitation. Such a mechanism (increased convection) may be useful for resolving disparities between different regional proxy records and model simulations. Finally, after assessing the available datasets (model and proxy), opportunities for better model–proxy integrated research are discussed. |
format |
Article in Journal/Newspaper |
author |
Ackerley, Duncan Reeves, Jessica Barr, Cameron Bostock, Helen Fitzsimmons, Kathryn Fletcher, Michael-Shawn Gouramanis, Chris McGregor, Helen Mooney, Scott Phipps, Steven J Tibby, John Tyler, Jonathan |
author_facet |
Ackerley, Duncan Reeves, Jessica Barr, Cameron Bostock, Helen Fitzsimmons, Kathryn Fletcher, Michael-Shawn Gouramanis, Chris McGregor, Helen Mooney, Scott Phipps, Steven J Tibby, John Tyler, Jonathan |
author_sort |
Ackerley, Duncan |
title |
Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
title_short |
Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
title_full |
Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
title_fullStr |
Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
title_full_unstemmed |
Evaluation of PMIP2 and PMIP3 simulations of mid-Holocene climate in the Indo-Pacific, Australasian and Southern Ocean regions |
title_sort |
evaluation of pmip2 and pmip3 simulations of mid-holocene climate in the indo-pacific, australasian and southern ocean regions |
publisher |
Copernicus GmbH |
publishDate |
2017 |
url |
http://hdl.handle.net/1959.4/unsworks_76599 https://unsworks.unsw.edu.au/bitstreams/9e59a8fc-1ee1-48c9-92a6-e843263c1671/download https://doi.org/10.5194/cp-13-1661-2017 |
genre |
ice core Southern Ocean |
genre_facet |
ice core Southern Ocean |
op_source |
urn:ISSN:1814-9332 Climate of the Past, 13, 11, 1661-1684 |
op_relation |
http://hdl.handle.net/1959.4/unsworks_76599 https://unsworks.unsw.edu.au/bitstreams/9e59a8fc-1ee1-48c9-92a6-e843263c1671/download https://doi.org/10.5194/cp-13-1661-2017 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read |
op_doi |
https://doi.org/10.5194/cp-13-1661-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
11 |
container_start_page |
1661 |
op_container_end_page |
1684 |
_version_ |
1799481652575993856 |