The IPCC on a heterogeneous Medieval Warm Period

Jan Esper; David Frank

doi:10.1007/s10584-008-9492-z

The IPCC on a heterogeneous Medieval Warm Period

Jan Esper, David Frank

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

In their 2007 report, IPCC working group 1 refers to an increased heterogeneity of climate during medieval times about 1000 years ago. This conclusion would be of relevance, as it implies a contrast in the spatial signature and forcing of current warmth to that during the Medieval Warm Period. Our analysis of the data displayed in the IPCC report, however, shows no indication of an increased spread between long-term proxy records. We emphasize the relevance of sample replication issues, and argue that an estimation of long-term spatial homogeneity changes is premature based on the smattering of data currently available.

Original language	English (US)
Pages (from-to)	267-273
Number of pages	7
Journal	Climatic Change
Volume	94
Issue number	3-4
DOIs	https://doi.org/10.1007/s10584-008-9492-z
State	Published - Jun 2009
Externally published	Yes

ASJC Scopus subject areas

Global and Planetary Change
Atmospheric Science

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10.1007/s10584-008-9492-z

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abstract = "In their 2007 report, IPCC working group 1 refers to an increased heterogeneity of climate during medieval times about 1000 years ago. This conclusion would be of relevance, as it implies a contrast in the spatial signature and forcing of current warmth to that during the Medieval Warm Period. Our analysis of the data displayed in the IPCC report, however, shows no indication of an increased spread between long-term proxy records. We emphasize the relevance of sample replication issues, and argue that an estimation of long-term spatial homogeneity changes is premature based on the smattering of data currently available.",

author = "Jan Esper and David Frank",

note = "Funding Information: Acknowledgements We thank Wally Broecker for discussion. Supported by the Swiss National Science Foundation through the National Centre for Competence in Climate Research (NCCR-Climate), and the EC project Millennium (Grant No. 017008).",

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AB - In their 2007 report, IPCC working group 1 refers to an increased heterogeneity of climate during medieval times about 1000 years ago. This conclusion would be of relevance, as it implies a contrast in the spatial signature and forcing of current warmth to that during the Medieval Warm Period. Our analysis of the data displayed in the IPCC report, however, shows no indication of an increased spread between long-term proxy records. We emphasize the relevance of sample replication issues, and argue that an estimation of long-term spatial homogeneity changes is premature based on the smattering of data currently available.

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The IPCC on a heterogeneous Medieval Warm Period

Abstract

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