Challenges and perspectives for large-scale temperature reconstructions of the past two millennia
Abstract
Knowledge of the temperature variability during the last one to two millennia is important for providing a perspective to present-day climate excursions, for assessing the sensitivity of the climate to different forcings, and for providing a test bed for climate models. Since systematic instrumental temperature records only extend back to the nineteenth century, such knowledge mainly relies on climate-sensitive proxy data. Here we critically assess some of the many challenges related to large-scale multiproxy temperature reconstructions. We begin with a review of available large-scale temperature reconstructions, focusing on the differences in low-frequency variability and the response to natural forcings such as major volcanic eruptions and changes in total solar irradiance. Then, we discuss different proxy selection strategies, review previously used reconstruction methods, and discuss their ability to reconstruct the amplitude of the low-frequency variability. To shed additional light on the challenges of large-scale reconstructions, we investigate the spatial and temporal correlation structures in the observed temperature field and discuss the implications of these correlation structures regarding the required number and positions of proxies. We demonstrate how the unavoidable uncertainty related to noisy proxies will show up as bias and variance in the reconstruction and that the partition between these formsmore »
- Authors:
-
[1];
[2]
- Danish Meteorological Inst., Copenhagen (Denmark). Dept. of Research and Development
- Stockholm Univ., Stockholm (Sweden). Dept. of History; Stockholm Univ., Stockholm (Sweden). Bolin Centre for Climate Research
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); Swiss National Science Foundation (SNSF)
- OSTI Identifier:
- 1565534
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Reviews of Geophysics (1985)
- Additional Journal Information:
- Journal Name: Reviews of Geophysics (1985); Journal Volume: 55; Journal Issue: 1; Journal ID: ISSN 8755-1209
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Geochemistry & Geophysics; temperature reconstructions; temperature proxy records; climate variability; paleoclimate
Citation Formats
Christiansen, Bo, and Ljungqvist, Fredrik Charpentier. Challenges and perspectives for large-scale temperature reconstructions of the past two millennia. United States: N. p., 2019.
Web. doi:10.1002/2016rg000521.
Christiansen, Bo, & Ljungqvist, Fredrik Charpentier. Challenges and perspectives for large-scale temperature reconstructions of the past two millennia. United States. doi:10.1002/2016rg000521.
Christiansen, Bo, and Ljungqvist, Fredrik Charpentier. Fri .
"Challenges and perspectives for large-scale temperature reconstructions of the past two millennia". United States. doi:10.1002/2016rg000521. https://www.osti.gov/servlets/purl/1565534.
@article{osti_1565534,
title = {Challenges and perspectives for large-scale temperature reconstructions of the past two millennia},
author = {Christiansen, Bo and Ljungqvist, Fredrik Charpentier},
abstractNote = {Knowledge of the temperature variability during the last one to two millennia is important for providing a perspective to present-day climate excursions, for assessing the sensitivity of the climate to different forcings, and for providing a test bed for climate models. Since systematic instrumental temperature records only extend back to the nineteenth century, such knowledge mainly relies on climate-sensitive proxy data. Here we critically assess some of the many challenges related to large-scale multiproxy temperature reconstructions. We begin with a review of available large-scale temperature reconstructions, focusing on the differences in low-frequency variability and the response to natural forcings such as major volcanic eruptions and changes in total solar irradiance. Then, we discuss different proxy selection strategies, review previously used reconstruction methods, and discuss their ability to reconstruct the amplitude of the low-frequency variability. To shed additional light on the challenges of large-scale reconstructions, we investigate the spatial and temporal correlation structures in the observed temperature field and discuss the implications of these correlation structures regarding the required number and positions of proxies. We demonstrate how the unavoidable uncertainty related to noisy proxies will show up as bias and variance in the reconstruction and that the partition between these forms of errors depends on the reconstruction method. Pseudo-proxy experiments are conducted to further discuss the influence of noise and the requirements regarding the geographical location and number of proxies necessary for reliably reconstructing the low-frequency variability. Finally, we conclude with recommendations for future large-scale temperature reconstructions.},
doi = {10.1002/2016rg000521},
journal = {Reviews of Geophysics (1985)},
number = 1,
volume = 55,
place = {United States},
year = {2019},
month = {12}
}
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