eCite Digital Repository

Paleoclimate data–model comparison and the role of climate forcings over the past 1500 years

Citation

Phipps, SJ and McGregor, HV and Gergis, J and Gallant, AJE and Neukom, R and Stevenson, S and Ackerley, D and Brown, JR and Fischer, MJ and van Ommen, TD, Paleoclimate data-model comparison and the role of climate forcings over the past 1500 years, Journal of Climate, 26, (18) pp. 6915-6936. ISSN 0894-8755 (2013) [Refereed Article]


Preview
PDF
Restricted - Request a copy
4Mb
  

Copyright Statement

Copyright 2013 American Meteorological Society

DOI: doi:10.1175/JCLI-D-12-00108.1

Abstract

The past 1500 years provide a valuable opportunity to study the response of the climate system to external forcings. However, the integration of paleoclimate proxies with climate modeling is critical to improving the understanding of climate dynamics. In this paper, a climate system model and proxy records are therefore used to study the role of natural and anthropogenic forcings in driving the global climate. The inverse and forward approaches to paleoclimate data–model comparison are applied, and sources of uncertainty are identified and discussed. In the first of two case studies, the climate model simulations are compared with multiproxy temperature reconstructions. Robust solar and volcanic signals are detected in Southern Hemisphere temperatures, with a possible volcanic signal detected in the Northern Hemisphere. The anthropogenic signal dominates during the industrial period. It is also found that seasonal and geographical biases may cause multiproxy reconstructions to overestimate the magnitude of the long-term preindustrial cooling trend. In the second case study, the model simulations are compared with a coral δ18O record from the central Pacific Ocean. It is found that greenhouse gases, solar irradiance, and volcanic eruptions all influence the mean state of the central Pacific, but there is no evidence that natural or anthropogenic forcings have any systematic impact on El Niño–Southern Oscillation. The proxy climate relationship is found to change over time, challenging the assumption of stationarity that underlies the interpretation of paleoclimate proxies. These case studies demonstrate the value of paleoclimate data–model comparison but also highlight the limitations of current techniques and demonstrate the need to develop alternative approaches.

Item Details

Item Type:Refereed Article
Keywords:Southern Hemisphere, Climate change, Climate variability, Paleoclimate, Climate models, Model comparison
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Palaeoclimatology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Variability (excl. Social Impacts)
Author:Phipps, SJ (Dr Steven Phipps)
Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:86939
Year Published:2013
Web of Science® Times Cited:58
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-11-02
Last Modified:2015-11-19
Downloads:0

Repository Staff Only: item control page