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系統識別號 U0026-0812200915354211
論文名稱(中文) 應用福爾摩沙二號衛星遙測影像探討2008 年沃德‧亨特冰架崩解與裂隙、融池與浮冰時空變化之影響
論文名稱(英文) Investigating the spatiotemporal variation of crevasses, melt ponds and ice floes during the 2008 Ward Hunt Ice Shelf calving event- evidence from Formosat-2 remote sensing imagery
校院名稱 成功大學
系所名稱(中) 衛星資訊暨地球環境研究所
系所名稱(英) Institute of Satellite Informatics and Earth Environment
學年度 97
學期 2
出版年 98
研究生(中文) 張越程
研究生(英文) Yueh-Cheng Chang
電子信箱 l9696103@mail.ncku.edu.tw
學號 l9696103
學位類別 碩士
語文別 英文
論文頁數 176頁
口試委員 口試委員-曾義星
口試委員-王驥魁
指導教授-劉正千
中文關鍵字 浮冰  融池  沃德亨特冰架  多期影像  高時空解析度  福爾摩沙二號衛星  浮冰島  裂隙  北極  艾爾斯米爾島  迪斯雷利峽灣  遙測  崩解 
英文關鍵字 melt pond  calving  sea ice  crevasse  ice island  Ward Hunt  ice shelf  remote sensing  Disraeli Fiord  multi-temporal  Formosat-2  Ellesmere Island  Arctic  high spatiotemporal resolution 
學科別分類
中文摘要 冰架(ice shelf)不僅對氣候變相當敏感,其崩解(disintegration)也間接導致海平面上升與更嚴峻的暖化現象。一般而言,促使北極浮冰島(ice island)崩解(calve)的因素包含風的變化、海冰(sea ice)退卻、和冰架破裂(fracture)的擴張。雖然融池(melt pond)被視為冰架崩解的前兆,數量龐大的融池已經存在於部分加拿大極區冰架(Jeffries,2002)。但是這些融池和冰架崩解的關係至今仍未被完整的調查。本研究旨在利用高時空解析度影像為此提供初步的觀測和調查,以位於加拿大極區艾爾斯米爾島(Ellesmere Island)之沃德亨特冰架(Ward Hunt Ice Shelf)在2008 年三次的浮冰島崩解事件為例。此冰架自上個世紀初以來已經消失90%的面積,正說明了其對氣候變遷的敏感性。
國家太空中心(NSPO)於極區影像任務中在2007 年(2 幅)至2008 年(15 幅)夏季取得此冰架許多高時空解析度福爾摩沙二號衛星光學影像。融池、裂隙和浮冰等表面現象被萃取並用作變遷之分析。MODIS 影像也被用來分析第三次的崩解。
本研究有幾項發現。首先,融池的面積減少與裂隙長度的增加有高相關性。裂隙好發並擴張於融池以及溝豁(troughs) 間, 這顯示水力壓裂作用(hydro-fracturemechanism)對結構弱化的影響。此外,發展的趨勢意外的在七月十七日至二十八日間減少,顯示出有系統性的變化發生。其次,在2007 至2008 年夏季期間產生的溝豁發展成新的融池;部分並進一步成為裂隙(crevasse)以及崩解的冰緣(ice front)。這支持Holdsworth (1987) 有關此冰架丘豁交錯(hummocks and troughs)的獨特表面起伏特徵與海冰壓迫造成冰架彎曲的理論。這些現象不單為融水削弱冰架提出觀測上的證據,也符合水力壓裂作用在南極冰堡(ice berg)崩解中扮演的角色(Rist et al., 2002;Scambos et al., 2009a)。再者,此組影像也顯示海冰退卻與崩解的高相關性。最後,由入侵邊緣冰區的海冰流,延冰緣東向的海流,海冰在新的崩解灣(calving bay)的再次累積,以及冰架薄區域的分布等現象,可推測由迪斯雷利峽灣(Disraeli Fjord)經2002年發現的裂隙(crack)流出的季節性水流的存在,並證實其內淡水流失的現象(Jeffries etal., 1990; Mueller et al., 2003)。這海流可能也與差異化的冰架薄化(thinning, 特別是底層融化)以及2002 年和2008 年發現的這些裂隙的產生有關。
這些發現暗示除了傳統的崩解因素(如冰架薄化、離岸風、海冰退卻、海浪傳遞)之外,底層海流與浮冰島及冰架崩解的間接相關性。除了更多資料的獲取與分析,這將會被用在未來對崩解的模型與模擬的研究中。
英文摘要 Ice shelves are vulnerable and sensitive to climate change. Their collapses indirectly lead to sea-level rising and further climate change. Typically speaking, causes for ice island calving in the Arctic include change of wind, sea ice retreat and fracture propagation. Although melt pond has been regarded as a precursor of the collapse of ice shelves, large numbers of melt ponds have been existed for at least a century in some of the ice shelves in the Canadian High Arctic (Jeffries, 2002). But the relationship between melt pond and ice island calving has not been well investigated yet due to lack of proper tool.
This research aims to provide a preliminary insight in the relationship between ice-island calving and variations of features on the surface of ice shelf and sea from high spatiotemporal imagery. The case study is the three calving events during 2008 melt season in Ward Hunt Ice Shelf (WHIS), Ellesmere, in the Canadian High Arctic. WHIS has lost 90% of its area since the beginning of the 20th century after its 3000+ years of existence, which has been regarded as very sensitive but vulnerable to climate change.
In 2007 (2 scenes) and 2008 (15 scenes), high-spatiotemporal optical images of Formosat-2 were acquired successfully in Polar Image Campaign (PIC) by National Space Organization (NSPO) from June to August. Surface features, such as melt pond, crevasse and sea ice, are extracted from these images for spatiotemporal analysis. MODIS imagery of WHIS is also employed to provide additional spatiotemporal information for the third calving event.
There are several findings. Firstly, the areal reduction of melt pond is highly correlated with the increase of crevasse length statistically. Furthermore, crevasse and rift tend to propagate through ponds and troughs, implying the effect of weakening due to hydro-fracture mechanism. However, the trend slowed down during July 17th and 28th, which reveals some systematical change in the drainage system. Secondly, new troughs are also observed during 2007-2008 winter, and then became melt ponds; some of these further propagated as rifts, and then resulted in calving, developed into new ice front along with the ex-fracture in some area at last, which supports Holdsworth’s propose (1987) related the formation of the unique land feature (with hummocks and troughs) to pack ice pressure, plate buckling and creep formation as a result. The above mentioned two phenomena altogether not only indicate that melt water does weaken the ice shelf, but also align with the theories of hydro-fracture mechanism on ice-berg calving in the Antarctica (Rist et al., 2002; Scambos et al., 2009a). Thirdly, this set of time-sequential imagery also shows that sea ice concentration over ice front has high correlation with calving events. Lastly, intrusive flow of pack ice to marginal ice zone, eastward flow along the ice front and formation of new fast-ice near to the east of the new calving bay (18 August 2008), combined with the distribution of thin areas in the map of thickness, altogether suggests that there is seasonal outflow from Disraeli Fiord through the central crack, found in 2002, which is consistent to previous studies about the existence of the flow and the drainage of the freshwater (Jeffries et al., 1990; Mueller et al., 2003). The bottom flows probably contribute to differential thinning (especially bottom melting) and formation of cracks both found in 2002 and 2008.
These findings imply that bottom flow is one of the potential mechanisms indirectly contributing to ice-island calving and ice-shelf disintegration, in addition to traditional factors, such as overall thinning, off-shore wind, sea ice retreat and wave propagation. This is to be simulated in calving model furthermore in addition to refinement and verification with more field data and analyses.
論文目次 ABSTRACT I
中文摘要 III
ACKNOWLEDGEMENT V
TABLE OF CONTENTS VI
LIST OF FIGURES IX
LIST OF TABLES XIII
CHAPTER 1 INTRODUCTION 1
1.1 POLAR REGIONS AND REMOTE SENSING 1
1.2 ICE SHELVES AND CLIMATE CHANGE 2
1.3 CALVING AND COLLAPSE OF ICE SHELVES 3
1.4 REQUIREMENTS FOR RESOLUTION 4
1.5 FORMOSAT-2 IMAGERY 5
1.6 OBJECTIVES 6
1.7 STRUCTURE 7
CHAPTER 2 REVIEW 8
2.1 FACTORS FOR ICE SHELF COLLAPSE 8
2.2 CALVING PROCESSES 10
2.2.1 Types of Calving 10
2.2.2 Some Mechanisms of Calving 12
2.2.3 Calving of Ice Island 14
2.2.4 Fracture Propagation 16
2.3 OPTICAL PROPERTIES OF MELT POND 19
2.4 TRACING SEA ICE MOTION 20
2.5 ESTIMATE THE THICKNESS OF ICE 21
2.6 SUMMARY: RATIONALE 22
CHAPTER 3 STUDY AREA – WARD HUNT ICE SHELF 23
3.1 GEOGRAPHY 23
3.2 ENVIRONMENTAL FACTORS 25
3.2.1 The Oceanic Factors 25
3.2.2 Decreasing Sea Ice Extent 26
3.2.3 Atmospheric Factors 27
3.3 INHERENT PROPERTIES 29
3.3.1 Thickness 29
3.3.2 Mass Balance 31
3.3.3 Topography 32
3.3.4 Formation of Hummocks and Troughs 33
3.3.5 Density Stratified Lake 35
3.4 SUMMARY, AND CLIMATE CHANGE 37
CHAPTER 4 DATA 40
4.1 SPECIFICATION AND CHARACTERISTICS OF FORMOSAT-2 40
4.2 APPLICATIONS ON POLAR REGIONS 41
4.2.1 Coverage over the Polar Regions 42
4.2.2 Temporal and Spatial Resolution 44
4.3 FORMOSAT-2 IMAGERY OF WHIS 47
4.3.1 Viewing Angle Group and Sun Elevation Angle 48
4.3.2 Pre-processing with F2AIPS 50
4.4 MULTI-TEMPORAL CO-REGISTRATION 52
4.4.1 No DEM nor Ortho-rectification 52
4.4.2 Work with Multi-temporal Co-registration Module of F2AIPS 54
4.4.3 Selection of Base Image 56
4.4.4 GCP Refinement 57
4.4.5 Assessment 58
4.5 SUPPLEMENTARY DATA AND PROCESSING 60
4.6 SUMMARY 61
CHAPTER 5 STRATEGIES AND METHODS 62
5.1 STRATEGIES 62
5.1.1 Multi-temporal Change Detection and Quality Control 63
5.1.2 Interpretation and Classification of Features 66
5.1.3 Detection to Hydro-fracture Processes 73
5.2 EXTRACTION OF MELT PONDS 75
5.2.1 Spectral Angle Mapper 75
5.2.2 A Glance to Pond Area Change 77
5.3 EXTRACTION OF CREVASSE 80
5.3.1 Challenges 80
5.3.2 Manual Digitization 81
5.4 EXTRACTION OF SEA ICE MOTION 83
5.5 APPROXIMATE THE THICKNESS OF WHIS 85
5.6 SUMMARY 87
CHAPTER 6 RESULT AND DISCUSSION 88
6.1 TEMPORAL CHANGES OF CREVASSE LENGTH AND POND AREA 88
6.1.1 Subset value of Ice Shelf Area and Pond Area 88
6.1.2 Density of Pond and Crevassse 91
6.1.3 Ratio of loss 93
6.1.4 Discussion 96
6.1.5 Summary 98
6.2 FROM TROUGH, MELT POND, CREVASSE AND RIFT FORMATION 103
6.2.1 Evidence 103
6.2.2 Discussion and Significance 104
6.2.3 Summary 106
6.3 ESTIMATED THICKNESS 108
6.3.1 Eestimating thickness from transects 108
6.3.2 Map of the Estimated Thickness 111
6.3.3 The Thin Area in the Southwest of WHI 111
6.3.4 The Thin Area in the East and Southeast of WHI 112
6.3.5 The Thin Area in the Northeastern NE subset 113
6.3.6 Summary 114
6.4 ON THE OCEANIC FACTORS -- SEA ICE MOTION AND TIDAL PREDICTION 115
6.4.1 First Glance at the Speed of Sea Ice Motion 115
6.4.2 Predicted Tidal Height and Cycle 117
6.5 A REVIEW OF THE THREE CALVING EVENTS IN 2008 117
6.5.1 Before the calving events (~July 8th) 117
6.5.2 The First Calving Event (between July 8th and July 17th) 118
6.5.3 The Second Calving Event between July 22nd and July 26th 121
6.5.4 Eastward Flow and Vortices 124
6.5.5 The third Calving Event (August 12th) 127
6.5.6 Rift formation to the south of Ward Hunt Island 128
6.6 SUMMARY 130
6.6.1 Change of CLD and PAD 130
6.6.2 Fracture on the calving front 130
6.6.3 Sea Ice Retreat 131
6.6.4 Flow and Current 131
6.6.5 Formation of Trough, Thickness and Crack 132
CHAPTER 7 CONCLUDING REMARKS 133
7.1 HYDRO-FRACTURE MECHANISM AND OCEANIC FACTORS 133
7.2 DIFFERENTIATE THINNING BY FLOW OR ALONG THE GROUNDING LINES 134
7.3 EXPECTED CONDITIONS OF DISINTEGRATION 135
7.4 FORMOSAT-2 IMAGERY OF ICE SHELF— CONSTRAINTS AND APPLICATIONS 137
CHAPTER 8 FUTURE WORK AND RECOMMENDATION 138
8.1 DATA COLLECTION 138
8.2 FIELD WORK 138
8.3 FOR SIMULATION 139
REFERENCES 140
SCIENTIFIC GLOSSARY 149
APPENDIX 1 SPACEBORNE REMOTE SENSING PLATFORMS 151
APPENDIX 2 FORMOSAT-2 DATA GRANULES OF WHIS 156
APPENDIX 3 DYNAMIC CHANGE OF THE MARGINAL ICE ZONE IN ALERT 159
APPENDIX 4 EXAMPLES AND ASSESSMENT FOR MELT POND EXTRACTION 160
APPENDIX 5 STATISTICS OF CREVASSE LENGTH CHANGE AND MELT POND AREA CHANGE OF ICE SHELF AND MELT POND IN THE EASTERN WHIS 161
APPENDIX 6 TIDAL PREDICTION IN DISRAELI FIORD 164
APPENDIX 7 TEMPORAL CHANGES OF WHIS – ICE FRONT AND SEA ICE MOTION 166
APPENDIX 8 TEMPORAL VARIATION DURING WHIS CALVING EVENTS IN 2008 174
APPENDIX 9 BUCKLING MODELS 176
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