Ice sheet response to climate changes: a modelling approach
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English German |
| Veröffentlicht: |
Zürich
Geographisches Inst. ETH
1993
|
| Schriftenreihe: | Zürcher geographische Schriften
54 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zsfassung in dt. Sprache |
| Beschreibung: | 134 S. graph. Darst. |
| ISBN: | 3906148025 |
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| 245 | 1 | 0 | |a Ice sheet response to climate changes |b a modelling approach |c Ayako Abe-Ouchi |
| 264 | 1 | |a Zürich |b Geographisches Inst. ETH |c 1993 | |
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| 650 | 4 | |a Klimaänderung | |
| 650 | 4 | |a Mathematisches Modell | |
| 650 | 4 | |a Climatic changes |z Greenland |x Mathematical models | |
| 650 | 4 | |a Ice sheets |z Greenland |x Mathematical models | |
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Datensatz im Suchindex
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|---|---|
| adam_text | Titel: Ice sheet response to climate changes
Autor: Abe-Ouchi, Ayako
Jahr: 1993
3
Table of Contents
Acknowledgements
Abstract 1
Zusammenfassung 2
Table of Contents 3
1 General Introduction 7
1.1 Presentation of the problem 7
1.2 Approaches 9
1.3 Objective and method of this work 10
Numerical modelling of ice sheets 12
2 Ice Sheet Dynamical Model 12
2.1 Basic equations for ice sheet dynamics 12
2.1.1 Basic equations 12
2.1.2 Boundary conditions 13
2.1.3 Isostatic rebound 16
2.1.4 Age of the ice (isochrone) 16
2.2 Ice sheet dynamics equations for the Cartesian co-ordinate 17
2.3 Approximations for the numerical modelling 18
2.3.1 Hydrostatic approximation 18
2.3.2 Shallow ice sheet approximation for ice sheets 19
2.3.3 Two dimensional approximation 21
2.3.4 Calving process 21
2.4 Numerical method 22
2.5 Climatic conditions 22
BASIS OF THE ICE SHEET DYNAMICS 24
3 Observed Data along the EGIG Profile, Greenland 24
4 Sensitivity of the Model to Various Parameters 28
4.1 Method of the sensitivity studies 28
4.2 Standard Experiment: its behaviour and the sensitivity to a flow
law parameter 30
4.2.1 Geometry and total mass balance 30
4.2.2 Thermal regime 35
4
4.3 The effect of climatic conditions 38
4.3.1 Sensitivity to ablation 38
4.3.2 Sensitivity to accumulation 43
4.3.3 Sensitivity to surface temperature 53
4.4 The effect of the solid earth 61
4.4.1 Sensitivity to the geothermal heat flux 61
4.4.2 Sensitivity to bedrock topography 65
5 Initiation, Disintegration and Steady States of Ice Sheets 72
5.1 Introduction 72
5.2 Structure of steady state solutions and thresholds for ice sheet
initiation and retreat 73
5.2.1 Steady state solutions with west EGIG topography 73
5.2.2 Dependence of retreat threshold on various climatic conditions 74
5.2.3 Dependence of steady state structure on bedrock topography 76
5.2.4 Effect of isostatic rebound movement 79
5.3 A growth condition of ice sheets 79
5.4 Time scales of ice sheet growth and retreat 81
5.5 Discussion and conclusions 83
Application to Climate Problems 85
6 Greenland Ice Sheet throughout the Ice Age and its Present State 85
6.1 Introduction 85
6.2 Climate forcing 86
6.3 Sensitivity studies 87
6.4 Response to glacial/interglacial cycles 91
6.5 Conclusions and discussions 94
7 Astronomical Forcing And the Ice Sheet Response 96
7.1 Introduction 96
7.2 Design of numerical experiment 100
7.3 Results 102
7.3.1 Non-linear irregular response 102
7.3.2 Termination and the non-linear feature 103
7.3.3 Calculation for the non-linear response 106
7.3.4 Steady state solution 1 io
7.3.5 Free self-sustained oscillation 110
5
7.3.6 Sensitivity to precipitation rate 111
7.3.7 Sensitivity to the response time of isostatic rebound 114
7.3.8 Sensitivity to bedrock topography 117
7.4 Discussion 119
7.4.1 Mechanism of the non-linearity 119
7.4.2 Implication for the Cenozoic ice sheet history 119
8 Synthesis and Conclusions 122
8.1 Summary of the results 122
8.1.1 Dynamical characteristics along the EGIG profile 122
8.1.2 Effect of climate and bedrock 122
8.1.3 Initiation and disintegration of ice sheets 123
8.1.4 Greenland ice sheet throughout the glacial/interglacial cycle
and its present state 124
8.1.5 Non-linear response to periodic forcing 125
8.2 Implications for evolution of present and past ice sheets 125
8.2.1 On the existence of the Greenland and Antarctic ice sheets,
and the contrast of the Laurentide and Greenland ice sheet 125
8.2.2 On the present state of the Greenland ice sheet 126
8.2.3 On the response of the Greenland ice sheet to future global
warming 127
8.2.4 On the evolution of Quaternary ice sheets 127
References 128
|
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| spelling | Abe-Ouchi, Ayako Verfasser aut Ice sheet response to climate changes a modelling approach Ayako Abe-Ouchi Zürich Geographisches Inst. ETH 1993 134 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Zürcher geographische Schriften 54 Zsfassung in dt. Sprache Zugl.: Diss. Klimaänderung Mathematisches Modell Climatic changes Greenland Mathematical models Ice sheets Greenland Mathematical models Klimaänderung (DE-588)4164199-1 gnd rswk-swf Inlandeis (DE-588)4225035-3 gnd rswk-swf Grönland (DE-588)4022113-1 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Inlandeis (DE-588)4225035-3 s Klimaänderung (DE-588)4164199-1 s DE-604 Grönland (DE-588)4022113-1 g Zürcher geographische Schriften 54 (DE-604)BV000016921 54 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=005860079&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Abe-Ouchi, Ayako Ice sheet response to climate changes a modelling approach Zürcher geographische Schriften Klimaänderung Mathematisches Modell Climatic changes Greenland Mathematical models Ice sheets Greenland Mathematical models Klimaänderung (DE-588)4164199-1 gnd Inlandeis (DE-588)4225035-3 gnd |
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| title | Ice sheet response to climate changes a modelling approach |
| title_auth | Ice sheet response to climate changes a modelling approach |
| title_exact_search | Ice sheet response to climate changes a modelling approach |
| title_full | Ice sheet response to climate changes a modelling approach Ayako Abe-Ouchi |
| title_fullStr | Ice sheet response to climate changes a modelling approach Ayako Abe-Ouchi |
| title_full_unstemmed | Ice sheet response to climate changes a modelling approach Ayako Abe-Ouchi |
| title_short | Ice sheet response to climate changes |
| title_sort | ice sheet response to climate changes a modelling approach |
| title_sub | a modelling approach |
| topic | Klimaänderung Mathematisches Modell Climatic changes Greenland Mathematical models Ice sheets Greenland Mathematical models Klimaänderung (DE-588)4164199-1 gnd Inlandeis (DE-588)4225035-3 gnd |
| topic_facet | Klimaänderung Mathematisches Modell Climatic changes Greenland Mathematical models Ice sheets Greenland Mathematical models Inlandeis Grönland Hochschulschrift |
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