GLACIAL EROSION IN ATLANTIC AND ARCTIC CANADA DETERMINED BY TERRESTRIAL IN SITU COSMOGENIC NUCLIDES AND ICE SHEET MODELING by Jane K. Willenbring Staiger Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Dalhousie University Halifax, NS September 2005 © Copyright by Jane K. Willenbring Staiger, 2005 Approved by Supervisor ________________________________________________ John C. Gosse, Ph. D. Associate Professor of Earth Sciences Supervisory Committee ________________________________________________ Lawrence Plug, Ph. D. Assistant Professor of Earth Sciences Departmental Reader ________________________________________________ Djordje Grujic, Ph. D. Associate Professor of Earth Sciences Department Chair ________________________________________________ Martin Gibling, Ph. D. Professor of Earth Sciences External Examiner ________________________________________________ Shawn J. Marshall, Ph. D. Associate Professor of Geography ii DALHOUSIE UNIVERSITY DATE: September 23, 2005 AUTHOR: Jane K. Willenbring Staiger TITLE: GLACIAL EROSION IN ATLANTIC AND ARCTIC CANADA DETERMINED BY TERRESTRIAL IN SITU COSMOGENIC NUCLIDES AND ICE SHEET MODELING DEPARTMENT OR SCHOOL: Department of Earth Sciences DEGREE: Ph.D. CONVOCATION: May YEAR: 2006 Permission is herewith granted to Dalhousie University to circulate and to have copied for non-commercial purposes, at its discretion, the above title upon the request of individuals or institutions. ____________________________________ Signature of Author The author reserves other publication rights, and neither the thesis nor extensive extracts from it may be printed or otherwise reproduced without the author’s written permission. The author attests that permission has been obtained for the use of any copyrighted material appearing in the thesis (other than the brief excerpts requiring only proper acknowledgement in scholarly writing), and that all such use is clearly acknowledged. iii Distribution License DalSpace requires agreement to this non-exclusive distribution license before your item can appear on DalSpace. NON-EXCLUSIVE DISTRIBUTION LICENSE You (the author(s) or copyright owner) grant to Dalhousie University the non-exclusive right to reproduce and distribute your submission worldwide in any medium. You agree that Dalhousie University may, without changing the content, reformat the submission for the purpose of preservation. You also agree that Dalhousie University may keep more than one copy of this submission for purposes of security, back-up and preservation. You agree that the submission is your original work, and that you have the right to grant the rights contained in this license. You also agree that your submission does not, to the best of your knowledge, infringe upon anyone's copyright. If the submission contains material for which you do not hold copyright, you agree that you have obtained the unrestricted permission of the copyright owner to grant Dalhousie University the rights required by this license, and that such third-party owned material is clearly identified and acknowledged within the text or content of the submission. If the submission is based upon work that has been sponsored or supported by an agency or organization other than Dalhousie University, you assert that you have fulfilled any right of review or other obligations required by such contract or agreement. Dalhousie University will clearly identify your name(s) as the author(s) or owner(s) of the submission, and will not make any alteration to the content of the files that you have submitted. If you have questions regarding this license please contact the repository manager at [email protected]. Grant the distribution license by signing and dating below. Name of signatory Date dedication page iv TABLE OF CONTENTS TITLE PAGE ..................................................................................................................... i SIGNATURE PAGE......................................................................................................... ii COPYRIGHT AGREEMENT........................................................................................iii DEDICATION PAGE ..................................................................................................... iv LIST OF TABLES ........................................................................................................... xi LIST OF FIGURES ........................................................................................................ xii ABSTRACT..................................................................................................................... xv ACKNOWLEDGEMENTS .......................................................................................... xvi CHAPTER 1...................................................................................................................... 1 INTRODUCTION................................................................................................................... 1 CHAPTER 2...................................................................................................................... 8 ATMOSPHERIC SCALING OF COSMOGENIC NUCLIDE PRODUCTION: THE CLIMATE EFFECT ................................................................................................................................8 2.1 ABSTRACT.................................................................................................................. 9 2.2 INTRODUCTION......................................................................................................... 10 2.3 METHODOLOGY ....................................................................................................... 12 2.3.1 UMISM..............................................................................................................13 2.3.2 CCM3 ................................................................................................................14 2.3.3 PRODUCTION RATE CALCULATIONS ......................................................................16 2.4 RESULTS .................................................................................................................. 17 2.5 DISCUSSION ............................................................................................................. 18 v 2.6 CONCLUSIONS .......................................................................................................... 21 2.7 ACKNOWLEDGEMENTS............................................................................................. 21 2.8 REFERENCES ............................................................................................................ 22 CHAPTER 3.................................................................................................................... 37 QUATERNARY RELIEF GENERATION BY POLYTHERMAL GLACIER ICE ........................... 37 3.1 ABSTRACT................................................................................................................ 38 3.2 INTRODUCTION......................................................................................................... 39 3.3 GEOMORPHIC SETTING............................................................................................. 41 3.4 TCN SURFACE EXPOSURE METHOD ........................................................................ 45 3.5 RESULTS .................................................................................................................. 47 3.6 DISCUSSION ............................................................................................................. 48 3.6.1 INTERPRETING TCN DATA IN GLACIATED TERRAINS..............................................48 3.6.2 ESTIMATING GLACIAL EROSION RATES.................................................................50 3.6.3 ICE SHEET MODEL TESTS ....................................................................................51 3.6.4 RELIEF GENERATION BY GLACIERS ......................................................................54 3.7 SUMMARY................................................................................................................ 56 3.8 ACKNOWLEDGEMENTS............................................................................................. 57 3.9 REFERENCES ............................................................................................................ 58 CHAPTER 4.................................................................................................................... 82 GLACIAL EROSION AND SEDIMENT DISPERSION FROM DETRITAL COSMOGENIC NUCLIDE ANALYSES ......................................................................................................... 82 4.1 ABSTRACT................................................................................................................ 83 4.2 INTRODUCTION......................................................................................................... 84 vi 4.3 PHYSIOGRAPHY OF THE STUDY AREA ...................................................................... 87 4.4 GLACIAL HISTORY.................................................................................................... 88 4.5 METHODOLOGY ....................................................................................................... 89 4.6 RESULTS .................................................................................................................. 94 4.7 DISCUSSION