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1 duits connecting the surface and base of the ice sheet).
2 necting supraglacial water to the bed of the ice sheet).
3 cial discharge from the surrounding grounded ice sheet.
4 hic habitats on the surface of the Greenland ice sheet.
5 kably robust net autotrophy on the Greenland Ice Sheet.
6 nd highlands and a diminished continent-wide ice sheet.
7 uto of non-brittle deformation within the N2-ice sheet.
8 balance during the retreat of the Laurentide Ice Sheet.
9 ta set to simulate the flow of the Greenland Ice Sheet.
10 ameters of cryoconite holes on the Greenland Ice Sheet.
11 torage even in this melt-prone region of the ice sheet.
12 r can be trapped and stored at the bed of an ice sheet.
13 nputs of surface meltwater to the bed of the ice sheet.
14 rface meltwater to the base of the Greenland Ice Sheet.
15 out a certain collapse of the West Antarctic Ice Sheet.
16 eshening due to mass loss from the Antarctic ice sheet.
17 , or the annual mass loss from the Greenland Ice Sheet.
18 accelerated future retreat of the Antarctic Ice Sheet.
19 of exposed rock, melting and thinning of the ice sheet.
20 indings can be directly translated to modern ice sheets.
21 constitute the arterial drainage network of ice sheets.
22 high elevation habitats protruding above the ice sheets.
23 sed to infer the time-varying state of major ice sheets.
24 n habitats near the expanding and retracting ice sheets.
25 oximately 1,500-km-long corridor between the ice sheets.
26 and stored in subglacial lakes beneath large ice sheets.
27 ning of Late-Pleistocene Northern Hemisphere ice sheets.
28 he Southern Ocean as a consequence of larger ice sheets.
30 stability of marine sectors of the Antarctic Ice Sheet (AIS) in a warming climate has been identified
31 Sea, Antarctica, indicate that the Antarctic ice sheet (AIS) was highly variable through this key tim
32 O2 levels of >/=600 ppm, a smaller Antarctic Ice Sheet (AIS), restricted to the terrestrial continent
33 lt to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level.
34 irst direct geological evidence of Antarctic ice-sheet (AIS) expansion at the MSC onset and use a del
36 cial volcanism can breach the surface of the ice sheet and may pose a great threat to WAIS stability.
37 olution ice-sheet modelling of the Antarctic Ice Sheet and multi-millennial global climate model simu
38 n extraterrestrial platinum in the Greenland Ice Sheet and of the earliest age of the Younger Dryas c
39 ample, increases in melting of the Greenland Ice Sheet and reductions in sea ice and permafrost distr
43 the sea-level budget into contributions from ice sheets and glaciers, the water cycle, steric expansi
44 gional-scale forcings, including insolation, ice sheets and ocean circulation, modulated glacier resp
46 erg-rafted debris derived from the Antarctic Ice Sheet, and performed both high-spatial-resolution ic
47 ice sheet has a stabilizing influence on the ice sheets, and previous studies have established the im
48 ity and accelerated melting of the Antarctic Ice Sheet are among the foremost elements of contemporar
49 r findings suggest that these sectors of the ice sheet are more resilient to the dynamic impacts of e
52 s sensitive to the history of the Laurentide Ice Sheet as the coastline lies along the ice sheet's pe
53 crucial to interpreting the past behavior of ice sheets, as well as to predicting their future evolut
55 ing the melting history of the Fennoscandian Ice Sheet at the end of the last deglaciation ( approxim
56 m (Pt) anomaly was reported in the Greenland ice sheet at the Younger Dryas boundary (YDB) (12,800 Ca
59 bility of the early to mid-Miocene Antarctic ice sheet because of three developments in our modeling
60 termine the distribution of meltwater at the ice-sheet bed before, during, and after three rapid drai
61 t enables water to drain from regions of the ice-sheet bed that have a high basal water pressure.
62 stent with distinct signatures of changes in ice sheet behaviour coincident with major climate transi
63 kes should be considered when predicting how ice sheet behaviour will change in a warming climate.
64 l lakes are widespread beneath the Antarctic Ice Sheet but their control on ice-sheet dynamics and th
65 es in the oxygen isotopic composition of the ice sheet by using isotope-enabled climate and ice sheet
67 onclude that (i) the interior surface of the ice sheet can be efficiently drained under optimal condi
68 , suggesting that small perturbations to the ice sheet can be substantially enhanced, providing a pos
69 This implies that as a minimum, a regional ice sheet centred on the Ellsworth-Whitmore uplands may
74 and modeling studies have suggested that the ice sheet contribution to future sea level rise could ha
75 dies suggesting that the collapse of a major ice sheet could be imminent or potentially underway in W
76 The ensuing freshwater discharge coming from ice sheets could have significant impacts on global clim
78 dence and numerical models indicate that the ice sheet covered much of westernmost Canada as late as
80 ams as unstable entities that can accelerate ice-sheet deglaciation, we conclude that ice streams exe
81 tephra were erupted though the center of the ice sheet, deposited near WAIS Divide and preserved in t
82 igh latitudes, eventually led to continental ice sheet development in Antarctica in the early Oligoce
83 Here we show that fluctuations in Antarctic Ice Sheet discharge caused by relatively small changes i
84 chemical measurements in the West Antarctic Ice Sheet Divide, Byrd, and other ice cores to document
85 ow that, for a lake on the western Greenland Ice Sheet, drainage events are preceded by a 6-12 hour p
86 plementary Fe sources, such as the Antarctic ice sheet, due to the difficulty of locating and interro
87 2) ), was less than half covered by grounded ice sheet during glaciations, is biologically rich and a
89 A clearer constraint on the behaviour of the ice sheet during past and, ultimately, future interglaci
90 ever, the configuration and stability of the ice sheet during past interglacial periods remains uncer
91 th landmasses were covered by the Laurentide ice sheet during the Last Glacial Maximum (18,000 years
93 The severe cooling and the expansion of the ice sheets during the Last Glacial Maximum (LGM), 27,000
94 e most vulnerable part of the West Antarctic Ice Sheet, during the Holocene epoch (from 11.7 thousand
95 ubglacial lake drainage events can induce an ice sheet dynamic response--a process that has been obse
96 er that the MPT was initiated by a change in ice sheet dynamics and that longer and deeper post-MPT i
98 ween loess sedimentation rate, Fennoscandian ice sheet dynamics, and sea level changes is proposed.
99 ivity (and then possible feedback) and ocean-ice sheet dynamics, respectively, rather than simple pro
100 the Antarctic Ice Sheet but their control on ice-sheet dynamics and their ability to harbour life rem
101 urface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice
102 its our understanding of past East Antarctic Ice Sheet (EAIS) behaviour and thus our ability to evalu
104 ular, the contribution of the East Antarctic Ice Sheet (EAIS) is ill defined, restricting our appreci
105 olar climate that enables the East Antarctic Ice Sheet (EAIS) to remain stable, frozen to underlying
108 flow, and present a challenge for modelling ice-sheet evolution and projecting global sea-level rise
110 This is in contrast to the expectation that ice sheets expand in colder climates and shrink in warme
113 SO behavior when global boundary conditions (ice sheet extent, atmospheric partial pressure of CO2) w
114 n changes in Chinese loess grain-size and NH ice-sheet extent, we use loess grain-size records to con
116 Here we show that progressive Fennoscandian Ice Sheet (FIS) melting 13,100-12,880 years ago generate
119 ion years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dio
121 times during deglaciation of the Laurentide Ice Sheet (from about 22,000 to 7,000 years ago) and sho
122 rom offshore Svalbard to constrain a coupled ice sheet/gas hydrate model, we identify distinct phases
126 ng land-terminating margins of the Greenland Ice Sheet (GIS) varies considerably in response to fluct
127 This gain partially offset water losses from ice sheets, glaciers, and groundwater pumping, slowing t
128 nt with the sum of individual contributions (ice sheets, glaciers, and hydrology) found in literature
131 icroorganisms are flushed from the Greenland Ice Sheet (GrIS) where they may contribute towards the n
133 in southern high-latitude climate, Antarctic ice sheet growth across the continental shelves, and ass
134 ar the grounding line of a retreating marine ice sheet has a stabilizing influence on the ice sheets,
137 atop a deep marine basin, the West Antarctic Ice Sheet has long been considered prone to instability.
139 flowing into the Amundsen Sea sector of the ice sheet have thinned at an accelerating rate, and seve
140 ubglacial melting of the Northern Hemisphere ice sheets have driven the observed (234)U/(238)U evolut
145 d accelerate future retreat of the Antarctic Ice Sheet if ice shelves that buttress grounding lines m
148 and we cannot distinguish between a remnant ice sheet in the East Greenland highlands and a diminish
149 the structure and long-term evolution of the ice sheet in this region have been understood insufficie
150 o millennial-scale response of the Antarctic ice sheet in which enhanced viscous flow produces a long
151 rved Heinrich events, but also suggests that ice sheets in contact with warming oceans may be vulnera
152 mportant for addressing questions concerning ice sheet (in)stability and changes in global sea level.
153 ial maximum (LGM), the demise of continental ice sheets induced crustal rebound in tectonically stabl
154 below sea level may be vulnerable to marine-ice-sheet instability (MISI), a self-sustaining retreat
156 ulations have suggested the initiation of an ice-sheet instability in the Amundsen Sea sector of West
162 recent interior thickening of the Greenland Ice Sheet is partly an ongoing dynamic response to the l
163 Recent peripheral thinning of the Greenland Ice Sheet is partly offset by interior thickening and is
164 of the volume of the present East Antarctic Ice Sheet is required to explain many of the approximate
166 ecause the equilibrium-response timescale of ice sheets is longer than those of the atmosphere or oce
167 During the Last Glacial Maximum, continental ice sheets isolated Beringia (northeast Siberia and nort
168 st Barents and Norwegian seas where grounded ice sheets led to thickening of the gas hydrate stabilit
174 sheet (with a marginal zone near the present ice-sheet margin) and the retreated ice sheet (with the
175 al calcites from close to the East Antarctic Ice-Sheet margin, which together suggest that volcanical
177 eams exerted progressively less influence on ice sheet mass balance during the retreat of the Laurent
178 Snowfall in Antarctica is a key term of the ice sheet mass budget that influences the sea level at g
179 pproximately 25% increase in total Greenland ice sheet mass loss ( approximately 1.4 m sea-level equi
181 lobally, suggesting that a dynamic Antarctic Ice Sheet may have driven climate fluctuations during th
183 sing and predicting the impacts of Antarctic Ice Sheet melting concerns the vertical distribution of
185 t high southern latitudes promoted Antarctic ice-sheet melting that fuelled the last interglacial sea
186 dissolved and amorphous silica in Greenland Ice Sheet meltwaters and icebergs, demonstrating the pot
192 CO2 These new drill core data and associated ice sheet modeling experiments indicate that polar clima
193 , and performed both high-spatial-resolution ice-sheet modelling of the Antarctic Ice Sheet and multi
199 to lower-resolution data currently used for ice-sheet models, these data show a contrasting topograp
200 ing Antarctica-contrary to present Antarctic ice-sheet models, which assume that meltwater is stored
202 f the Weddell Sea embayment that suggest the ice sheet, nourished by increased snowfall until the ear
205 of the behavior of Northern Hemisphere (NH) ice sheets over the past million years is crucial for un
206 We propose that the appearance of larger ice sheets over the past million years was a consequence
207 ed a progressively smaller percentage of the ice sheet perimeter and their total discharge decreased.
208 reveal that subglacial lakes beneath modern ice sheets periodically store and release large volumes
211 YDB Pt anomaly is consistent with Greenland Ice Sheet Project 2 (GISP2) data that indicated atmosphe
215 conventional wisdom, however, the Greenland ice sheet responds to this energy through a new pathway
216 ne retreat may have been a highly non-linear ice sheet response to relatively continuous external for
219 hane sequestration and subsequent release on ice sheet retreat that led to the formation of a suite o
222 observational evidence that rapid deglacial ice-sheet retreat into Pine Island Bay proceeded in a si
223 uplift and sea-surface drop associated with ice-sheet retreat significantly reduces AIS mass loss re
227 lance simulations show evidence for enhanced ice sheet runoff under volcanically forced conditions de
232 pically span only a few decades, and, at the ice-sheet scale, it is unclear how the entire drainage n
233 influenced ice stream activity, but--at the ice-sheet scale--their drainage network adjusted and was
234 (AMOC), inflowing warm Atlantic Layer water, ice sheet, sea-ice and ice-shelf feedbacks, and sensitiv
237 nces and challenges involved in constraining ice-sheet sensitivity to climate change with use of pale
238 res accurate portrayal of outlet glaciers in ice sheet simulations, but to date poor knowledge of sub
239 ns since the Miocene during periods when the ice sheet size was smaller than today, but with an overa
241 ring the last glacial period, the Laurentide Ice Sheet sporadically discharged huge numbers of iceber
242 e interactions between ocean, atmosphere and ice sheet stability during the YD, more high-resolution
243 ommitment for different carbon emissions and ice sheet stability scenarios, we compute the current po
244 ts emphasize the importance of the ocean for ice sheet stability under the current changing climate.
245 tive of a change in the dynamics that govern ice sheet stability, such as that expected from the remo
246 nary GIS collapse after it crossed a climate/ice-sheet stability threshold that may have been no more
247 increased iceberg calving and dispersal from ice sheets surrounding the North Atlantic has inspired m
248 nt the response of the present-day Antarctic ice-sheet system to the oceanic and climatic changes of
249 within the eastern sector of the Laurentide Ice Sheet than traditional reconstructions for this inte
251 e longest period of stability of the present ice sheet that is consistent with the measurements is 1.
253 ree of the largest glaciers of the Greenland Ice Sheet; these have been major contributors to ice los
254 an ice-shelf collapse may have caused rapid ice-sheet thinning further upstream-and since the 1940s.
255 the mass and energy balance of the Greenland ice sheet through its impact on radiative budget, runoff
256 inage of meltwater across the surface of the ice sheet through surface streams and ponds (hereafter '
257 nic eruptions can impact the mass balance of ice sheets through changes in climate and the radiative
258 nus from subsurface warming and allowing the ice sheet to advance again until, at its most advanced p
265 ribution of the Greenland and West Antarctic ice sheets to sea level has increased in recent decades,
269 ucting the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Terminatio
272 cial meltwater rivers draining the Greenland Ice Sheet, using a recently developed submersible analyz
273 e coming centuries, but our understanding of ice-sheet variations before the last interglacial 125,00
274 ble interval) over the next few millennia as ice sheets, vegetation and atmospheric dust continue to
275 hat there were major variations in Antarctic ice sheet volume and extent during the early to mid-Mioc
277 geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf
279 driver of mass loss from the West Antarctic Ice Sheet (WAIS) has been warm ocean water underneath co
282 trajectory of thinning of the West Antarctic ice sheet (WAIS) since the last glacial maximum (LGM) is
284 The mean concentration of cells exiting the ice sheet was 8.30 x 10(4) cells mL(-1) and we estimate
285 similar to that observed beneath the extant ice sheet, was also active during the last glacial perio
286 ra subglacial basin before continental-scale ice sheets were established about 34 million years ago.
289 grain-size records to confirm that northern ice-sheets were restricted during marine oxygen isotope
290 m in less crevassed, interior regions of the ice sheet, where water at the bed is currently less perv
291 s left a direct thermal remnant in the polar ice sheets, where the exceptional purity and continual a
292 id growth of Northern Hemisphere continental ice sheets, which terminated warm and stable climate per
293 ng that the future response of the Antarctic Ice Sheet will be governed more by long-term anthropogen
296 rations, corresponding to the 'modern-scale' ice sheet (with a marginal zone near the present ice-she
297 present ice-sheet margin) and the retreated ice sheet (with the marginal zone located far inland).
298 the glacier catchments of the West Antarctic Ice Sheet within the low topography of the West Antarcti
299 ws the potential for prognostic modelling of ice sheets without the need for spatially varying parame
300 man perturbations no substantial build-up of ice sheets would occur within the next several thousand
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