Reconstruction of the thermal environment evolution in urban areas from underground temperature distribution.

It is possible to estimate the ground surface temperature (GST) history of the past several hundred years from temperature profiles measured in boreholes because the temporal variation in GST propagates into the subsurface by thermal diffusion. This "geothermal method" of reconstructing GST histories can be applied to studies of thermal environment evolution in urban areas, including the development of "heat islands." Temperatures in boreholes were logged at 102 sites in Bangkok, Jakarta, Taipei, Seoul and their surrounding areas in 2004 to 2007. The effects of recent surface warming can be recognized in the shapes of most of the obtained temperature profiles. The preliminary results of reconstruction of GST histories through inversion analysis show that GST increased significantly in the last century. Existing temperature profile data for the areas in and around Tokyo and Osaka can also be used to reconstruct GST histories. Because most of these cities are located on alluvial plains in relatively humid areas, it is necessary to use a model with groundwater flow and a layered subsurface structure for reconstruction analysis. Long-term records of subsurface temperatures at multiple depths may demonstrate how the GST variation propagates downward through formations. Time series data provide information on the mechanism of heat transfer (conduction or advection) and the thermal diffusivity. Long-term temperature monitoring has been carried out in a borehole located on the coast of Lake Biwa, Japan. Temperatures at 30 and 40 m below the ground surface were measured for 4 years and 2 years, respectively, with a resolution of 1 mK. The obtained records indicate steady increases at both depths with different rates, which is probably the result of some recent thermal event(s) near the surface. Borehole temperatures have also been monitored at selected sites in Bangkok, Jakarta, and Taiwan.

[1]  A. Beck,et al.  Least squares inversion of borehole temperature measurements in functional space , 1991 .

[2]  J. Smerdon,et al.  Air‐ground temperature coupling and subsurface propagation of annual temperature signals , 2004 .

[3]  William C Burnett,et al.  Integrated research on subsurface environments in Asian urban areas. , 2008, The Science of the total environment.

[4]  P. A. Domenico,et al.  Theoretical analysis of forced convective heat transfer in regional ground-water flow , 1973 .

[5]  I. Kayane,et al.  Disturbances of temperature‐depth profiles due to surface climate change and subsurface water flow: 1. An effect of linear increase in surface temperature caused by global warming and urbanization in the Tokyo Metropolitan Area, Japan , 1999 .

[6]  M. Taniguchi,et al.  Combined Effects of Urbanization and Global Warming on Subsurface Temperature in Four Asian Cities , 2007 .

[7]  J. Smerdon,et al.  Conduction‐dominated heat transport of the annual temperature signal in soil , 2003 .

[8]  A. Jessop.  Hydrological distortion of heat flow in sedimentary basins , 1989 .

[9]  P. Todhunter,et al.  The borehole temperature record of climate warming in the mid-continent of North America , 1997 .

[10]  A. Correia,et al.  Repeated temperature logs from Czech, Slovenian and Portuguese borehole climate observatories , 2007 .

[11]  H. Beltrami,et al.  Ground surface temperatures in Canada: Spatial and temporal variability , 2003 .

[12]  Allan D. Woodbury,et al.  Urban heat island in the subsurface , 2007 .

[13]  M. Taniguchi,et al.  Effects of urbanization and groundwater flow on the subsurface temperature in Osaka, Japan , 2005 .

[14]  Shaopeng Huang,et al.  Ground surface temperature histories inverted from subsurface temperatures of two boreholes located in Panxi, SW China , 1995 .

[15]  D. Chapman,et al.  A geothermal climate change observatory: First year results from Emigrant Pass in northwest Utah , 1996 .

[16]  J. Smerdon,et al.  Surface temperature trends in Russia over the past five centuries reconstructed from borehole temperatures , 2003 .

[17]  Vladimír Čermák,et al.  Last 250 years climate reconstruction inferred from geothermal measurements in the Czech Republic , 1998 .

[18]  Shaopeng Huang,et al.  CLIMATE RECONSTRUCTION FROM SUBSURFACE TEMPERATURES , 2000 .

[19]  L. Bodri,et al.  Recent Climate Warming: Surface Air Temperature Series and Geothermal Evidence , 2000 .

[20]  J. D. Bredehoeft,et al.  Rates of vertical groundwater movement estimated from the Earth's thermal profile , 1965 .

[21]  A. Lachenbruch,et al.  Changing Climate: Geothermal Evidence from Permafrost in the Alaskan Arctic , 1986, Science.

[22]  Kelin Wang.  Estimation of ground surface temperatures from borehole temperature data , 1992 .

[23]  M. Kinoshita,et al.  Thermal response of sediment with vertical fluid flow to periodic temperature variation at the surface , 2005 .

[24]  M. Taniguchi,et al.  Shallow subsurface thermal regimes in major plains in Japan with reference to recent surface warming , 2003 .

[25]  Y. Uchida,et al.  Distribution of subsurface temperature in the Kanto Plain, Japan; estimation of regional groundwater flow system and surface warming , 2003 .

[26]  J. Majorowicz,et al.  East to west retardation in the onset of the recent warming across Canada inferred from inversions of temperature logs , 2002 .

[27]  Makoto Taniguchi,et al.  From headwaters to the ocean: hydrological change and water management. , 2008 .

[28]  A comparative study of geothermal and meteorological records of climate change in Kamchatka , 2006 .

[29]  Kelin Wang,et al.  Geothermal Evidence from Canada for a Cold Period Before Recent Climatic Warming , 1992, Science.

[30]  Reconstruction of the ground surface temperature history from the borehole temperature data in the southeastern part of the Republic of Korea , 2005 .

[31]  G. Ferguson,et al.  Perturbation of ground surface temperature reconstructions by groundwater flow? , 2006 .

[32]  H. Beltrami,et al.  Resolution of ground temperature histories inverted from borehole temperature data , 1995 .