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Climate from borehole data: Energy fluxes and temperatures since 1500
Author(s) -
Beltrami Hugo
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015702
Subject(s) - borehole , heat flux , flux (metallurgy) , inversion (geology) , geology , energy balance , geophysics , energy flux , environmental science , climatology , atmospheric sciences , heat transfer , materials science , geomorphology , physics , thermodynamics , structural basin , geotechnical engineering , astronomy , metallurgy
Variations in the Earth's surface energy balance are recorded in the ground as perturbations of the subsurface thermal regime. Here I apply singular value decomposition (SVD) inversion methods to 826 temperature‐depth profiles distributed world wide, in order to reconstruct ground surface temperature histories (GSTH) and surface heat flux histories (SHFH) from the temperature and heat flux anomalies detected in the shallow subsurface. Inversions yielded a mean ground surface temperature and surface heat flux histories for the Earth's continents for the last 500 years. Results indicate that the global average ground temperature and ground heat flux have increased an average of 0.45°K and 18.0 mWm 2 respectively over the last 200 years, and 0.9°K in the last five centuries.