Clifford Posted February 3, 2011 Share Posted February 3, 2011 Subsurface Temperature Records should give us better indications of average temperature patterns than surface temperature records, as underground should provide more of an long-term average temperature. I.E. The reason for Permafrost is that the average temperature is below freezing despite the surface periodically getting above freezing. I have found the Metolius River in Oregon. It is a spring-fed river with records back to 1954 (and a gap in the middle). It doesn't appear to be remarkable, although it may actually be too deep of a spring, or perhaps glacier fed confounding the data. http://waterdata.usg...erred_module=sw Actually, looking at the data, for some reason the "old" data is clustered. The "new" data is daily. The minimum temperatures actually are showing a slight downward trend. Actually, I think the trend of the "minimums" is about 1°C in a half century (both on the high minimums and low minimums, I'm not sure about the average calcs or other analyses). I'll ponder that that decrease in minimum temperatures means, and post updated graphs later. Of course, it could be due to an equipment change, for example waiting until 8:00 AM to read the minimum temperatures in the 50's, and reading the minimums at 3:00 AM now. There was a recent borehole temperature mapping in Antarctica. However, it will certainly be dependent on surface ice accumulation, glacier movements, and etc. Hopefully they can follow it up once a decade or so with new data. Does anybody know of other good (Rural?) subsurface temperature records? Preferably not in the ocean. Long term monitoring of well water or spring water temperatures? Link to comment Share on other sites More sharing options...
salbers Posted February 5, 2011 Share Posted February 5, 2011 I've posted some discussions of borehole data over at Eastern Wx, so we'll have to find that stuff again for here. So perhaps try this: http://www.ncdc.noaa.gov/paleo/globalwarming/pollack.html Link to comment Share on other sites More sharing options...
Clifford Posted February 6, 2011 Author Share Posted February 6, 2011 Thank you. I'll look at that report more later. I was actually looking for serial measurements from near-surface locations at the same location. There are a few bore holes that are close to each other in that data set that will be worth evaluating. So, it looks like we've been warming for a very long time. Although, I guess we already knew that as the graph corresponds to the time since the Little Ice Age/Maunder Minimum. It is interesting to look at some of the bore hole temps. Hot at depth (core/mantle influence). Cool in the center (I presume corresponding to the influence from the Little Ice Age/Maunder Minimum, or other cooler periods). Warmer at the surface (Influence from recent temperatures). Borehole Site: CA-001-0 Data Contact: A.M. Jessop (CA) Depth - Temperature (°C) 24.40 - 9.40 30.20 - 9.31 37.80 - 9.13 45.40 - 8.98 53.00 - 8.88 60.70 - 8.81 68.30 - 8.78 75.90 - 8.80 83.20 - 8.85 90.80 - 8.91 98.50 - 8.98 106.10 - 9.08 113.70 - 9.18 121.30 - 9.30 128.90 - 9.40 136.60 - 9.50 144.20 - 9.60 151.80 - 9.71 159.40 - 9.93 167.00 - 10.07 Link to comment Share on other sites More sharing options...
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