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RISS 인기검색어
- 검색키워드
- 저자 : Scambos, T. A. (검색결과 4 건)
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Surface mass balance contributions to acceleration of Antarctic ice mass loss during 2003-2013
Seo, Ki-Weon,Wilson, Clark R.,Scambos, Ted,Kim, Baek-Min,Waliser, Duane E.,Tian, Baijun,Kim, Byeong-Hoon,Eom, Jooyoung American Geophysical Union 2015 Journal of geophysical research. JGR. Earth surfac Vol.120 No.5
<P> Recent observations from satellite gravimetry (the Gravity Recovery and Climate Experiment (GRACE) mission) suggest an acceleration of ice mass loss from the Antarctic Ice Sheet (AIS). The contribution of surface mass balance changes (due to variable precipitation) is compared with GRACE-derived mass loss acceleration by assessing the estimated contribution of snow mass from meteorological reanalysis data. We find that over much of the continent, the acceleration can be explained by precipitation anomalies. However, on the Antarctic Peninsula and other parts of West Antarctica, mass changes are not explained by precipitation and are likely associated with ice discharge rate increases. The total apparent GRACE acceleration over all of the AIS between 2003 and 2013 is -13.6 ± 7.2 Gt/yr<SUP>2</SUP>. Of this total, we find that the surface mass balance component is -8.2 ± 2.0 Gt/yr<SUP>2</SUP>. However, the GRACE estimate appears to contain errors arising from the atmospheric pressure fields used to remove air mass effects. The estimated acceleration error from this effect is about 9.8 ± 5.8 Gt/yr<SUP>2</SUP>. Correcting for this yields an ice discharge acceleration of -15.1 ± 6.5 Gt/yr<SUP>2</SUP>. </P>
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Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream
Kim, Byeong-Hoon,Lee, Choon-Ki,Seo, Ki-Weon,Lee, Won Sang,Scambos, Ted Copernicus GmbH 2016 The cryosphere Vol.10 No.6
<P><p><strong>Abstract.</strong> We identify two previously unknown subglacial lakes beneath the stagnated trunk of the Kamb Ice Stream (KIS). Rapid fill-drain hydrologic events over several months are inferred from surface height changes measured by CryoSat-2 altimetry and indicate that the lakes are probably connected by a subglacial drainage network, whose structure is inferred from the regional hydraulic potential and probably links the lakes. The sequential fill-drain behavior of the subglacial lakes and concurrent rapid thinning in a channel-like topographic feature near the grounding line implies that the subglacial water repeatedly flows from the region above the trunk to the KIS grounding line and out beneath the Ross Ice Shelf. Ice shelf elevation near the hypothesized outlet is observed to decrease slowly during the study period. Our finding supports a previously published conceptual model of the KIS shutdown stemming from a transition from distributed flow to well-drained channelized flow of subglacial water. However, a water-piracy hypothesis in which the KIS subglacial water system is being starved by drainage in adjacent ice streams is also supported by the fact that the degree of KIS trunk subglacial lake activity is relatively weaker than those of the upstream lakes.</p> </P>
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Seo, K.W.,Waliser, D.E.,Lee, C.K.,Tian, B.,Scambos, T.,Kim, B.M.,van Angelen, J.H.,van den Broeke, M.R. Elsevier 2015 Global and planetary change Vol.128 No.-
Understanding the mechanisms that drive the mass imbalance of the Greenland ice sheet (GrIS) is critical to the accurate projection of its contribution to future sea level rise. Greenland's ice mass loss has been accelerating recently. Using satellite Earth-gravity and regional climate model data, we show that the acceleration rate of Greenland ice mass loss from 2003 to 2012 is -13.9+/-2.0Gt/yr<SUP>2</SUP>, which results mainly from an increase of meltwater runoff (-6.3+/-1.1Gt/yr<SUP>2</SUP>) and a decrease of precipitation (-4.8+/-1.1Gt/yr<SUP>2</SUP>). Before the extreme surface melting in the summers of 2010 and 2012, the decrease of precipitation (-9.7+/-2.5Gt/yr<SUP>2</SUP>) was a larger contributor to the ice mass loss acceleration than the increase of runoff (-2.1+/-2.2Gt/yr<SUP>2</SUP>). Furthermore, we show that the North Atlantic Oscillation (NAO) is linked to the precipitation decrease during summer, and its recent influence to Greenland is anomalously large possibly due to the change in atmospheric circulation in the North Atlantic. These results indicate that inter-annual climate variability is playing a significant role in the recently observed Greenland ice mass loss acceleration, underscoring the difficulty of projecting future sea level rise based on the recent observations of GrIS mass loss.
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Lavoie, C.,Domack, E. W.,Pettit, E. C.,Scambos, T. A.,Larter, R. D.,Schenke, H.-W.,Yoo, K. C.,Gutt, J.,Wellner, J.,Canals, M.,Anderson, J. B.,Amblas, D. Copernicus GmbH 2015 The cryosphere Vol.9 No.2
<P><p><strong>Abstract.</strong> We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger 'streaming flow' is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-ice-stream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel.</p> </P>
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