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Southern Hemisphere high-resolution palaeoclimate records of the last 2000 years


Number of proxy records that each grid cell correlates significantly with
Southern Hemisphere high-resolution palaeoclimate records of the last 2000 years

The Holocene
Vol. 22, no. 5, pp. 501-524, May 2012
DOI: 10.1177/0959683611427335

Raphael Neukom1,2 and Joëlle Gergis 2
1 Oeschger Centre for Climate Change Research, University of Bern, Switzerland
2School of Earth Sciences, University of Melbourne, Australia

Fig. 2 (middle). Summary maps for the HadSLP2r grid 1901-2006. Number of proxy records (out of a total of 191) that each grid cell correlates significantly with.
proxy record correlation scale
ABSTRACT:
This study presents a comprehensive assessment of high-resolution Southern Hemisphere (SH) paleoarchives covering the last 2000 years. We identified 174 monthly to annually resolved climate proxy (tree ring, coral, ice core, documentary, speleothem and sedimentary) records from the Hemisphere. We assess the interannual and decadal sensitivity of each proxy record to large-scale circulation indices from the Pacific, Indian and Southern Ocean regions over the twentieth century. We then analyse the potential of this newly expanded palaeoclimate network to collectively represent predictands (sea surface temperature, sea level pressure, surface air temperature and precipitation) commonly used in climate reconstructions. The key dynamical centres-of-action of the equatorial Indo-Pacific are well captured by the palaeoclimate network, indicating that there is considerable reconstruction potential in this region, particularly in the post AD 1600 period when a number of long coral records are available. Current spatiotemporal gaps in data coverage and regions where significant potential for future proxy collection exists are discussed. We then highlight the need for new and extended records from key dynamical regions of the Southern Hemisphere. Although large-scale climate field reconstructions for the SH are in their infancy, we report that excellent progress in the development of regional proxies now makes plausible estimates of continental- to hemispheric-scale climate variations possible.
Download data from the WDC Paleo archive:
Data Files are correlation maps (in .png format) of each proxy record with instrumental grids, over the 20th century. Click here for Data Description or Data Folder

To read or view the full study, please visit the Holocene website.
It was published in The Holocene, Vol. 22, no. 5, pp. 501-524, May 2012. DOI: 10.1177/0959683611427335
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