Recent climate variations in Chile: constraints from borehole temperature profiles
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Published:2018-04-26
Issue:4
Volume:14
Page:559-575
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Pickler CarolyneORCID, Gurza Fausto Edmundo, Beltrami HugoORCID, Mareschal Jean-Claude, Suárez FranciscoORCID, Chacon-Oecklers Arlette, Blin Nicole, Cortés Calderón Maria Teresa, Montenegro Alvaro, Harris Rob, Tassara Andres
Abstract
Abstract. We have compiled, collected, and analyzed 31 temperature–depth
profiles from boreholes in the Atacama Desert in central and northern Chile.
After screening these profiles, we found that only nine profiles at four different
sites were suitable to invert for ground temperature history. For all the
sites, no surface temperature variations could be resolved for the period
1500–1800. In the northern coastal region of Chile, there is no perceptible
temperature variation at all from 1500 to present. In the northern central
Chile region, between 26 and 28∘ S, the data suggest a
cooling from ≈ 1850 to ≈ 1980 followed by a 1.9 K warming
starting ≈ 20–40 years BP. This result is consistent with the ground
surface temperature histories for Peru and the semiarid regions of South
America. The duration of the cooling trend is poorly resolved and it may
coincide with a marked short cooling interval in the 1960s that is found in
meteorological records. The total warming is greater than that inferred from
proxy climate reconstructions for central Chile and southern South America,
and by the PMIP3-CMIP5 surface temperature simulations for the north-central
Chile grid points. The differences among different climate reconstructions,
meteorological records, and models are likely due to differences in spatial
and temporal resolution among the various data sets and the models.
Funder
Canada Excellence Research Chairs, Government of Canada
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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