caa a22 4500 477047769 CHVBK 20180405111334.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF00878843 doi (NATIONALLICENCE)springer-10.1007/BF00878843 Inference of ground surface temperature history from subsurface temperature data: Interpreting ensembles of borehole logs [Elektronische Daten] [Henry Pollack, Po Shen, Shaopeng Huang] Ground surface temperature histories (GSTHs) inferred from borehole temperaturedepth (T-z) data are often degraded, to a various extent, by random or systematic noise in theT-z data and in the measurements of thermophysical properties of the earth. To minimize the effects of noise, and hence improve the fidelity of the inferred GSTH, a plausible approach is to perform a simultaneous inversion, of theT-z logs in a region, or alternatively, to invert the individualT-z logs and then average the resulting GSTHs. Averaging and simultaneous inversion are conceptually different: whereas an averaging can always be peformed, a simultaneous inversion is predicated on the assumption of a common transient component of the GSTH in all theT-z logs. In this work we examine and compare the two approaches, using a time domain inverse formulation based on the method of least squares. We consider a set of scenarios: (a) multipleT-z logs from a single borehole, (b) multiple boreholes from a single site, (c) multiple boreholes in similar climatological settings, and (d) multiple boreholes in different climatological settings. We show that for (a), (b) and (c), averaging and simultaneous inversion yield nearly identical results. For boreholes in different settings, the assumption of a common transient GSTH may be invalid and averaging and simultaneous inversion give divergent results. Birkhäuser Verlag, 1996 Borehole temperature nationallicence climate change nationallicence inversion nationallicence Pollack Henry Department of Geological Sciences, University of Michigan, 48109-1063, Ann Arbor, Michigan, USA aut Shen Po Department of Earth Sciences, University of Western Ontario, N6A 5B7, London, Canada aut Huang Shaopeng Department of Geological Sciences, University of Michigan, 48109-1063, Ann Arbor, Michigan, USA aut pure and applied geophysics Birkhäuser-Verlag 147/3(1996-08-01), 537-550 0033-4553 147:3<537 1996 147 24 https://doi.org/10.1007/BF00878843 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00878843 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pollack Henry Department of Geological Sciences, University of Michigan, 48109-1063, Ann Arbor, Michigan, USA aut NATIONALLICENCE 700 1- Shen Po Department of Earth Sciences, University of Western Ontario, N6A 5B7, London, Canada aut NATIONALLICENCE 700 1- Huang Shaopeng Department of Geological Sciences, University of Michigan, 48109-1063, Ann Arbor, Michigan, USA aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 147/3(1996-08-01), 537-550 0033-4553 147:3<537 1996 147 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer