texpand methods text - cosmo - front and backend for Markov-Chain Monte Carlo inversion of cosmogenic nuclide concentrations

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commit c61d24deab6ce81dcb4e8b538cab571d035beb2e

parent f10b964bf2b108b2bfdb8e7fe509f1731af47984

Author: Anders Damsgaard 

Date:   Fri, 27 Nov 2015 14:26:03 +0100

expand methods text

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t@@ -16,15 +16,31 @@
                     Constraining the landscape history and past erosion rates in
                     previously glaciated terrains is, however, notoriously
                     difficult because it involves a large number of unknowns.
-                    The potential use of cosmogenic nuclides in landscapes with
-                    a complex history of exposure and erosion is therefore often
-                    quite limited. Here, we present a novel multi-nuclide
-                    approach based on the Markov Chain Monte Carlo (MCMC)
-                    technique.  The model framework currently incorporates any
-                    combination of the following nuclides 10Be,
-                    26Al, 14C, and 21Ne, and is
-                    highly flexible.
-                    

+                    This webpage uses an approach based on the Markov Chain
+                    Monte Carlo (MCMC) technique.  The model framework currently
+                    incorporates any combination of the following terrestrial
+                    cosmogenic nuclides (TCNs) 10Be, 26Al,
+                    14C, and 21Ne in order to constrain a
+                    two-stage glacial/interglacial history at the site of
+                    sampling.

+
+                    
The MCMC technique is used to simulate TCN concentrations
+                    associated with a large number of different
+                    glacial-interglacial histories, including highly varying
+                    glacial and interglacial erosion rates. Based on comparisons
+                    to measured concentrations, it is possible to determine the
+                    most likely landscape history and associated uncertainties.
+
+                    

+                        The model approach approximates the values
+                        and uncertainties of four output parameters;
+                        interglacial erosion rate (εint),
+                        glacial erosion rate (εgla), time of
+                        last deglaciation (tdegla), and the
+                        climate threshold value in the marine oxygen-isotope
+                        record (δ18Othreshold) at
+                        the site of sampling.
+                    
 
                     
In the following we give a basic overview of the applied
                     methods and their application. For a full description see
t@@ -48,7 +64,19 @@
                 

                     

                         Two-stage glacial-interglacial model
-                    
bla bla
+                    
The model concept builds on the assumption of a
+                    "two-stage uniformitarianism", meaning that the processes
+                    that operated during the Holocene also operated during
+                    earlier interglacials with comparable intensity. Likewise,
+                    the erosion rate during the past glacial periods is assumed
+                    to be comparable.
+
+                    
The model approach assumes that glacial periods were
+                    characterized by 100% shielding and no exposure, which would
+                    require more than 10 m of ice thickness for production due
+                    to spallation (>50 m for muons). Interglacial periods are
+                    assumed to have been characterized by 100% exposure and zero
+                    shielding.
                 
 
 
t@@ -71,20 +99,20 @@
                     
You may use the following BibTeX entry:
                     

                         
    @article{Knudsen2015,
-            author = "Knudsen, M. F. and Egholm, D. L. and Jacobsen, B. H.
-                and Larsen, N. K. and Jansen, J. D. and Andersen, J. L.
-                and Linge, H. C.",
-            title = "A multi-nuclide approach to constrain landscape
-                evolution and past erosion rates in previously glaciated
-                terrains",
-            journal = "Quaternary Geochronology",
-            volume = "30, Part A",
-            number = "",
-            pages = "100--113",
-            year = "2015",
-            issn = "1871-1014",
-            doi = "http://dx.doi.org/10.1016/j.quageo.2015.08.004",
-        }
+        author = "Knudsen, M. F. and Egholm, D. L. and Jacobsen, B. H.
+            and Larsen, N. K. and Jansen, J. D. and Andersen, J. L.
+            and Linge, H. C.",
+        title = "A multi-nuclide approach to constrain landscape
+            evolution and past erosion rates in previously glaciated
+            terrains",
+        journal = "Quaternary Geochronology",
+        volume = "30, Part A",
+        number = "",
+        pages = "100--113",
+        year = "2015",
+        issn = "1871-1014",
+        doi = "http://dx.doi.org/10.1016/j.quageo.2015.08.004",
+    }