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| Titel |
Repeated temperature logs from Czech, Slovenian and Portuguese borehole climate observatories |
| VerfasserIn |
J. Safanda, D. Rajver, A. Correia, P. Dĕdeček |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 3 ; Nr. 3, no. 3 (2007-07-31), S.453-462 |
| Datensatznummer |
250001073
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| Publikation (Nr.) |
 copernicus.org/cp-3-453-2007.pdf |
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| Zusammenfassung |
| Two borehole climate observatories were established in Slovenia and Portugal
within a joint Czech-Slovenian-Portuguese project in the years 2003-2005.
Together with the older Czech observatory, which has been operating since
the year 1994, they monitor air, soil and bedrock temperatures with the aim
of studying air-ground coupling and the downward propagation of the surface
temperature changes. We report here on repeated temperature logs carried out
within 6 boreholes at the sites of the observatories and their surroundings
within a time span of 8–20 years (1985–2005). The repeated logs
revealed subsurface warming in all the boreholes amounting to 0.2–0.6°C below 20 m depth. The compatibility of the observed temporal changes
of subsurface temperature with surface air temperature (SAT) series measured
in Prague (since 1771), Ljubljana (since 1851) and Lisbon (since 1856) was
checked by comparing repeated temperature logs with synthetic profiles that
were calculated using SAT series as forcing functions. The depth of the
Czech borehole (140 m) and the Portuguese borehole (180 m) was sufficient
for a reconstruction of the ground surface temperature (GST) history of the
last 150–200 years. Reconstructed GSTs were compared with the SAT series
measured in Prague and Lisbon, respectively. The reconstructed histories
reproduce reasonably well the amplitude of the recent warming inferred from
the meteorological data, 1–1.5°C above the long-term mean. The
depth (100 m) of the four repeatedly logged Slovenian boreholes was too
shallow for inversion, but a climatic reconstruction was carried out for a
deeper borehole, logged in 2006 and located within 5 km from the Slovenian
observatory. The obtained GST history was compared with SAT series from
Ljubljana. |
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