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Global Warming and Green House Gases

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Global Warming and Green House Gases – PowerPoint PPT presentation

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Title: Global Warming and Green House Gases


1
Global Warming and Green House Gases
2
Geothermics of Climate Change
  • Reconstructing T(t)
  • Geothermics tutorial
  • Field measurements
  • Examples Utah globe
  • Combining geothermal meteorological
    data
  • Observatory
  • Seasonality observation
  • Energy balance
  • Conclusions

3
Air - Ground Tracking
  • Disadvantages
  • Short records (post 1860)
  • Non climatic biases
  • Station moves
  • Instrument changes
  • Advantages
  • Direct measure of
  • temperature
  • Good fidelity
  • Good spatial coverage

4
  • Disadvantages
  • Temperature calibration issues
  • Seasonal sensitivity
  • Poor low frequency resolution
  • Advantages
  • Long records (millennia)
  • Annual resolution

5
  • Disadvantages
  • Loss of temporal resolution
  • with time
  • Arbitrary offset with SAT
  • Advantages
  • Long records (centuries)
  • Annual sensitivity
  • Direct measure of
  • temperature

6
  • Disadvantages
  • Loss of temporal
  • resolution with time
  • Advantages
  • Long records (centuries)
  • Direct measure of temperature
  • Directly tied and compared
  • to SAT record

7
The Geothermal Method
8
(No Transcript)
9
Evidence From Alaska
10
(No Transcript)
11
Evidence from Western Utah
12
Evidence from Western Utah
13
Evidence from Western Utah Meteorological
Data 100 Year SAT Records
14
Evidence from Western Utah Reduced Temperature
Profiles
15
Evidence from Western Utah Consistency between
SAT and T(z) Data
16
Global Database of Temperature-Depth Profiles for
Climatic Reconstruction
17
Northern Hemisphere
18
Hybrid Model
19
Comparison with Proxy Reconstructions
20
  • Frequently Asked Questions
  • Is SGT not different from SAT?
  • 2. How well does SGT track SAT
  • through time?
  • 3. How does snow effect SGT-SAT
  • tracking?

Our Response Build a geothermal-climate change
observatory
21
Building EPO
22
Emigrant Pass Climate Change Observatory
23
Emigrant Pass Observatory 1994
24
(No Transcript)
25
Snow Model
26
Snow Model Results
27
Reconciling Borehole Temperatures with Proxies
  1. Differences in spatial coverage represented by
    network?
  2. What is the proxy really measuring?
  3. To what season is the proxy responding?
  4. Differences in frequency content of time series?

28
Seasonality and Tree-Rings
29
(No Transcript)
30
Thermal Effects of Climate Change Energy
Balance World Year of Physics
31
Geothermics of Climate Change
  • Method complementary to other studies.
  • (direct, continuous, filtered measure
    of T(t))
  • T(z) profiles consistent with SAT records.
  • T(z) ramp inversions 0.8C over 160
    years. POM-SAT models yield POMs about 0.60.1C
    below the 1961-90 mean temperature. Additional
    0.4C of recent warming.
  • Observatory reveals air-ground T(t) tracking
    details.
  • 5. Snow effect quantified.
  • 6. Boreholes indicate winter warming since about
    1500 and greater climatic sensitivity to
    greenhouse gas forcing than indicated by other
    reconstructions.

32
University of Utah Team Geothermics
Harris
Chisholm
Putnam
Bartlett
Score A for Imagination
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