An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach
New Zealand's climate during the Last Glacial Maximum has been investigated using the UKMO global and regional models HadAM3H (GCM) and HadRM3H (RCM). SSTs and sea-ice were supplied from a set of prior coupled model (HadCM3) runs and all models were set up according to the glacial conditions as...
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Victoria University of Wellington
2006
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ftvuwellington:oai:researcharchive.vuw.ac.nz:10063/533 2023-08-15T12:38:35+02:00 An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach Drost, Frank Renwick, James McGregor, James Shulmeister, James 2006 http://researcharchive.vuw.ac.nz/handle/10063/533 en_NZ eng Victoria University of Wellington http://researcharchive.vuw.ac.nz/handle/10063/533 Environmental conditions Mathematical models Climatic changes New Zealand Paleoclimatology Text Doctoral 2006 ftvuwellington 2023-07-25T17:22:28Z New Zealand's climate during the Last Glacial Maximum has been investigated using the UKMO global and regional models HadAM3H (GCM) and HadRM3H (RCM). SSTs and sea-ice were supplied from a set of prior coupled model (HadCM3) runs and all models were set up according to the glacial conditions as specified by PMIP. In the analysis of the global simulation, emphasis was placed on the climate of the Southern Hemisphere. Compared to the present day, the modelled climate of the LGM is mainly characterized by the different wind regimes, both in the zonal and meridional directions. In the zonal mean, the polar trough shifted equatorward, and the westerly wind increased slightly between approximately 30 degrees S-50 degrees S, and decreased poleward of this zonal band. At the same time, there was an increase in the number of and/or strength of southerlies between 35 degrees S-60 degrees S. This resulted in a reduction of the poleward zonal mean meridional heat transport, and an enhancement of the wave number 3 pattern in the mean zonal circulation. All these changes contributed to a weaker SAO during the LGM. Interannual variability was as today, dominated by the High Latitude Mode (HLM, or Antarctic Oscillation/Southern Annular Mode) and ENSO. For the LGM, New Zealand was about 2.5 degrees C-4 degrees C cooler than in a pre-industrial control simulation. The seasonal cooling was largest during winter. Excluding the Alpine region, the largest cooling geographically took place in the east of the South Island. Precipitation was in general reduced everywhere during the whole year, except for the east of the South Island. The westerly wind increased considerably over the North Island and the northern part of the South Island, but was weaker over the rest of the South Island. JJA was the exception with weaker westerly winds over all New Zealand which was probably related to enhance blocking during that season. The stronger westerly wind accentuated the cooling over the North Island, except for the eastern region, where it ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Sea ice Victoria University of Wellington: ResearchArchive Antarctic New Zealand |
institution |
Open Polar |
collection |
Victoria University of Wellington: ResearchArchive |
op_collection_id |
ftvuwellington |
language |
English |
topic |
Environmental conditions Mathematical models Climatic changes New Zealand Paleoclimatology |
spellingShingle |
Environmental conditions Mathematical models Climatic changes New Zealand Paleoclimatology Drost, Frank An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
topic_facet |
Environmental conditions Mathematical models Climatic changes New Zealand Paleoclimatology |
description |
New Zealand's climate during the Last Glacial Maximum has been investigated using the UKMO global and regional models HadAM3H (GCM) and HadRM3H (RCM). SSTs and sea-ice were supplied from a set of prior coupled model (HadCM3) runs and all models were set up according to the glacial conditions as specified by PMIP. In the analysis of the global simulation, emphasis was placed on the climate of the Southern Hemisphere. Compared to the present day, the modelled climate of the LGM is mainly characterized by the different wind regimes, both in the zonal and meridional directions. In the zonal mean, the polar trough shifted equatorward, and the westerly wind increased slightly between approximately 30 degrees S-50 degrees S, and decreased poleward of this zonal band. At the same time, there was an increase in the number of and/or strength of southerlies between 35 degrees S-60 degrees S. This resulted in a reduction of the poleward zonal mean meridional heat transport, and an enhancement of the wave number 3 pattern in the mean zonal circulation. All these changes contributed to a weaker SAO during the LGM. Interannual variability was as today, dominated by the High Latitude Mode (HLM, or Antarctic Oscillation/Southern Annular Mode) and ENSO. For the LGM, New Zealand was about 2.5 degrees C-4 degrees C cooler than in a pre-industrial control simulation. The seasonal cooling was largest during winter. Excluding the Alpine region, the largest cooling geographically took place in the east of the South Island. Precipitation was in general reduced everywhere during the whole year, except for the east of the South Island. The westerly wind increased considerably over the North Island and the northern part of the South Island, but was weaker over the rest of the South Island. JJA was the exception with weaker westerly winds over all New Zealand which was probably related to enhance blocking during that season. The stronger westerly wind accentuated the cooling over the North Island, except for the eastern region, where it ... |
author2 |
Renwick, James McGregor, James Shulmeister, James |
format |
Doctoral or Postdoctoral Thesis |
author |
Drost, Frank |
author_facet |
Drost, Frank |
author_sort |
Drost, Frank |
title |
An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
title_short |
An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
title_full |
An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
title_fullStr |
An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
title_full_unstemmed |
An Investigation into New Zealand's Climate During the Last Glacial Maximum: a Climate Modelling Approach |
title_sort |
investigation into new zealand's climate during the last glacial maximum: a climate modelling approach |
publisher |
Victoria University of Wellington |
publishDate |
2006 |
url |
http://researcharchive.vuw.ac.nz/handle/10063/533 |
geographic |
Antarctic New Zealand |
geographic_facet |
Antarctic New Zealand |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
http://researcharchive.vuw.ac.nz/handle/10063/533 |
_version_ |
1774299943989673984 |