Temperature signal in the underground for climate history reconstruction in Italy

Pasquale, V.; Verdoya, Massimo; Chiozzi, P.; Bodri, L.; Bellani, S.

doi:10.1016/j.gloplacha.2004.11.015

Cited by 14 publications

(16 citation statements)

References 26 publications

(33 reference statements)

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“…Studies have targeted various spatial scales, from local and regional (e.g. Clauser and Mareschal, 1995;Gosnold et al, 1997;Šafanda et al, 1997Rajver et al, 1998;Harris and Gosnold, 1999;Majorowicz et al, 1999;Beltrami, 2000;Beltrami et al, 2005;Rimi, 2000;Correia andŠafanda, 2001;Gosselin and Mareschal, 2003;Goto et al, 2005;Pasquale et al, 2005;Hamza et al, 2007), to large scales (e.g. Pollack and Huang, 2000;Golovanova et al, 2001;Roy et al, 2002;Beltrami et al, 2003;Pollack et al, 2006) as well as hemispheric and global scales (e.g.…”

Section: Borehole Climatologymentioning

confidence: 99%

Borehole climatology: a discussion based on contributions from climate modeling

et al. 2009

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Abstract. Progress in understanding climate variability through the last millennium leans on simulation and reconstruction efforts. Exercises blending both approaches present a great potential for answering questions relevant both for the simulation and reconstruction of past climate, and depend on the specific peculiarities of proxies and methods involved in climate reconstructions, as well as on the realism and limitations of model simulations. This paper explores research specifically related to paleoclimate modeling and borehole climatology as a branch of climate reconstruction that has contributed significantly to our knowledge of the low frequency climate evolution during the last five centuries.The text flows around three main issues that group most of the interaction between model and geothermal efforts: the use of models as a validation tool for borehole climate reconstructions; comparison of geothermal information and model simulations as a means of either model validation or inference about past climate; and implications of the degree of realism on simulating subsurface climate on estimations of future climate change.The use of multi-centennial simulations as a surrogate reality for past climate suggests that within the simplified reality of climate models, methods and assumptions in borehole reconstructions deliver a consistent picture of past climate evolution at long time scales. Comparison of model simulations and borehole profiles indicate that borehole temperatures are responding to past external forcing and that more realism in the development of the soil model components in climate models is desirable. Such an improved degree of Correspondence to: J. F. González-Rouco (fidelgr@fis.ucm.es) realism is important for the simulation of subsurface climate and air-ground interaction; results indicate it could also be crucial for simulating the adequate energy balance within climate change scenario experiments.

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Section: Borehole Climatologymentioning

confidence: 99%

Borehole climatology: a discussion based on contributions from climate modeling

et al. 2009

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“…The boreholes were drilled both for studies of surface heat-flow density and exploration of geothermal resources and water. They are situated in the vicinity of some boreholes (GH1, GH3 and GH4) unaffected by advective perturbations, which were analysed in previous papers (Pasquale et al, 2000(Pasquale et al, , 2005a. Table 1 shows geographic coordinates and date of logging of the boreholes.…”

Section: Thermal Recordsmentioning

confidence: 99%

“…Shorter series are available for Alessandria and Bobbio (1934Bobbio ( -2002. Details on data homogenisation, updating and improvement are scattered in several papers (see Pasquale et al, 2005a, and references therein). We performed additional tests by means of diagrams of year-by-year temperature variability, defined as the absolute difference of the average temperature from one year to the next (Bodri and Cermák, 2003).…”

Section: Sat Datamentioning

confidence: 99%

“…Inversion of borehole geothermal data can reveal the ground surface temCorrespondence to: M. Verdoya (verdoya@dipteris.unige.it) perature (GST) history (see e.g. Beltrami and Harris, 2001;Pasquale et al, 2005a, and references therein) which for deeper boreholes can be reconstructed back to the last ice age (e.g. Kukkonen and Joeleth, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…2). Some of these profiles were rejected in previous studies on climate change (Pasquale et al, 2000(Pasquale et al, , 2005a, because more or less affected by perturbations due to groundwater. The identification of the past climate changes in this area by using only meteorological data is problematic because of the relative shortness of the time series, the sparse spatial arrangement of the existing SAT records and the possible presence of hidden heterogeneities in the SAT series.…”

Section: Introductionmentioning

confidence: 99%

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Thermal log analysis for recognition of ground surface temperature change and water movements

2007

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Abstract.A joint analysis of surface air temperature series recorded at meteorological stations and temperature-depth profiles logged in nearby boreholes was performed to estimate conditions existing prior to the beginning of the instrumental record in central-northern Italy. The adopted method considers conductive and advective heat transport in a layered medium and provides simultaneous estimates of the preobservational temperatures and the Darcy velocities. The reconstruction of the ground surface temperature history using a generalised least-squares inversion method was performed for boreholes where hydrological disturbances to measured temperature logs were proved negligible. Both methods revealed generally coherent climatic changes in the whole investigated area. Climatic conditions were generally warm and comparable with the reference period . The absence of the Little Ice Age seems to be a generic feature of the climate in central-northern Italy. Climate change of the 19th century was generally insignificant with well-balanced periods of cold and warmth. The investigated area became significantly colder only at the end of the 19th century. Cooling culminated around 1950 when it was replaced by rapid warming. Recent warming was not inferred only for one of the investigated holes.

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