North American regional climate reconstruction from ground surface temperature histories
Within the framework of the PAGES NAm2k project, 510 North American borehole temperature–depth profiles were analyzed to infer recent climate changes. To facilitate comparisons and to study the same time period, the profiles were truncated at 300 m. Ground surface temperature histories for the last...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-12-01
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| Series: | Climate of the Past |
| Online Access: | http://www.clim-past.net/12/2181/2016/cp-12-2181-2016.pdf |
| Summary: | Within the framework of the PAGES NAm2k project, 510 North American borehole
temperature–depth profiles were analyzed to infer recent climate changes. To
facilitate comparisons and to study the same time period, the profiles were
truncated at 300 m. Ground surface temperature histories for the last
500 years were obtained for a model describing temperature changes at the
surface for several climate-differentiated regions in North America. The
evaluation of the model is done by inversion of temperature perturbations
using singular value decomposition and its solutions are assessed using a
Monte Carlo approach. The results within 95 % confidence interval suggest
a warming between 1.0 and 2.5 K during the last two centuries. A regional
analysis, composed of mean temperature changes over the last 500 years and
geographical maps of ground surface temperatures, show that all regions
experienced warming, but this warming is not spatially uniform and is more
marked in northern regions. |
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| ISSN: | 1814-9324 1814-9332 |