Rwenzori Whats TorresAcosta et al objective How can we relate last weeks paper to this TorresAcosta et als paper Conceptual model by Kevin Norton 2010 Determining basinwide erosion rates using CRN 10Be 26Al ID: 473621
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Slide1Slide2
East African Rift
RwenzoriSlide3
What’s Torres-Acosta et al. objective?
How can we relate last week’s paper to this Torres-Acosta et al.’s paper?Slide4
Conceptual model
by Kevin Norton 2010
Determining basin-wide erosion rates using CRN (10Be, 26Al)
Concentration of nuclides
(
Ni
)
and erosion rate (
ɛ
) are inversely related:
Cosmic rays
But, they also decay:
Λ attenuation length (~m)
P
i
production rate
ρ is the density of the eroding material
e
is erosion rate in the catchment
N
i
t
d
Assume 0 production post deposition
N
i,E
(e.g.,
Balco
and Stone 2005)Slide5
Sample sites for CRN
What‘s their catchment criteria? and why?Slide6
Methods
Erosion rate
:
CRN-
10
Be
Vegetation
:
Enhance Vegetation Index (EVI)
Vegetation Continuous Field (VCF)
What are the differences between the two data sets?Slide7
Huete et al. 2002Slide8
Figure
s
1&2Slide9
Supplementary
figures
Why do they only use part of the catchment for topography, climate and vegetation data?Slide10
Methods
Erosion rate
:
CRN-
10
Be
Vegetation
:
Enhance Vegetation Index (EVI)
Vegetation Continuous Field (VCF)
What is the issue about comparing the denudation rates with vegetation data? Slide11
Figure 3 and 4Slide12
Figure 5
Important point they make with this graph?Slide13
Figure 6
What are the graphs comparing?
Ignoring the grey lines in 6A, What do they conclude?
What do they see in Fig. 6A?
How do they go about to determine the cause of the two scaling relations?Slide14
Figure 7
What is each graph showing?
What do they determine for the potential cause of the two scaling relationships?
What do they rely on to make this interpretation?Slide15
Changing climate conditions - time scale integration
How to they account for the fact that the modern vegetation does not capture the time-integrated effects of vegetation changes?
How do they connect denudation rates with vegetation changes?
Is vegetation cover an important factor in denudation rate? Slide16
Concluding comments
?
Do you agree with their conclusion?Slide17Slide18
Riebe and Granger 2013