Increased ice flow in Western Palmer Land linked to ocean melting

Hogg, Anna E.; Shepherd, A.; Cornford, Stephen; Briggs, K.; Gourmelen, Noël; Graham, Jennifer; Joughin, Ian; Mouginot, J.; Nägler, Thomas; Payne, Antony J.; Rignot, Eric; Wuite, Jan

doi:10.1002/2016gl072110

Cited by 70 publications

(98 citation statements)

References 66 publications

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“…We added similar discharge estimates for George IV ice shelf (Hogg et al, 2017). Figure 2d shows the resulting changes in the sensible heat flux (SHF), which are closely related to the changes in LW net , causing…”

Section: Discharge Estimatesmentioning

confidence: 99%

“…Section 4 presents the specific changes and evaluation for the 5.5 km model version applied to the AP. Section 5 then discusses remaining challenges and model limitations, followed 10 by a summary and conclusions in Section 6. This manuscript is part of a tandem model evaluation over the Greenland (part 1) and Antarctic (this study) ice sheets.…”

Section: Introductionmentioning

confidence: 99%

“…observations (Favier et al, 2013), radar-derived snow accumulation (Medley et al, 2013), Cloudsat-CALIPSO satellite observations (Van Tricht et al, 2016b), QSCAT-satellite derived melt fluxes (Trusel et al, 2013), AP glacial discharge estimates (Wuite et al, 2015;Hogg et al, 2017) and SEB data from AWSs. We find a significant improvement in simulated SEB and SMB over the ice sheet, in particular at lower elevations.…”

mentioning

confidence: 99%

“…The Cryosphere Discuss., https://doi.org /10.5194/tc-2017-202 Manuscript under review for journal The Cryosphere (Wuite et al, 2015) and (b) the George VI embayment (Hogg et al, 2017). Horizontal error bars represent the uncertainty in the discharge estimate, vertical bars the interannual variability of RACMO2.3.…”

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confidence: 99%

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Modelling the climate and surface mass balance of polar ice sheets using RACMO2, part 2: Antarctica (1979–2016)

Wessem¹,

Berg²,

Noël³

et al. 2017

Preprint

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Abstract. We evaluate modelled Antarctic ice sheet (AIS) near-surface climate, surface mass balance (SMB) and surface energy balance (SEB) from the updated polar version of the regional atmospheric climate model RACMO2 (1979RACMO2 ( -2016. The updated model, referred to as RACMO2.3p2, incorporates upper-air relaxation, a revised topography, tuned parameters in the cloud scheme to generate more precipitation towards the AIS interior, and modified snow properties reducing drifting snow sublimation and increasing surface snowmelt. The updated model provides a new, high-resolution dataset of the contemporary near-surface climate and SMB of the AIS; this model version will be used for future climate scenario projections in a forthcoming study. IntroductionBefore being able to accurately predict future changes in the climate and surface mass balance (SMB) of the Antarctic ice sheet 15 (AIS), it is required that its contemporary climate and SMB are realistically modelled. The interaction of the ice sheet with its atmospheric environment can be studied with regional climate models (RCMs) that are specifically adapted for use over 1 The Cryosphere Discuss., https://doi

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Section: Discharge Estimatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Modelling the climate and surface mass balance of polar ice sheets using RACMO2, part 2: Antarctica (1979–2016)

Wessem¹,

Berg²,

Noël³

et al. 2017

Preprint

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“…Here, outlet glaciers have thinned rapidly in the last two decades, contributing ∼0.1 mm a −1 to global sea-level rise (Wouters et al, 2015;Hogg et al, 2017). Many of these glaciers are grounded below sea-level with deeply-incised bedrock troughs (Figure 1b).…”

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Dynamic response of Antarctic Peninsula Ice Sheet to collapse of Larsen C and George VI ice shelves

Schannwell

Cornford

Pollard

et al. 2018

Preprint

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Abstract. Ice shelf break-up and disintegration events over the past several decades have led to speed-up, thinning, and retreat of upstream tributary glaciers and increases to rates of global sea-level rise. The southward progression of these episodes indicates a climatic cause, and in turn suggests that the larger Larsen C and George VI ice shelves may undergo similar collapse in future. However, the extent to which removal of Larsen C and George VI ice shelves will affect upstream tributary glaciers and add to global sea levels is unknown. Here we apply numerical ice-sheet models of varying complexity to show that 5 the centennial sea-level commitment of Larsen C embayment glaciers following immediate shelf collapse is low (<2.5 mm to 2100, <4.3 mm to 2300). Despite its large size, Larsen C does not provide strong buttressing forces to upstream basins and its collapse does not result in large additional discharge from its tributary glaciers in any of our model scenarios. In contrast, the response of inland glaciers to collapse of George VI Ice Shelf may add up to 8 mm to global sea levels by 2100 and 22 mm by 2300 due in part to the mechanism of marine ice sheet instability. Our results demonstrate the varying and relative importance 10 to sea level of the large Antarctic Peninsula ice shelves considered to present a risk of collapse.

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Variable Basal Melt Rates of Antarctic Peninsula Ice Shelves, 1994–2016

Adusumilli

Fricker

Siegfried

et al. 2018

Geophysical Research Letters

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We have constructed 23‐year (1994–2016) time series of Antarctic Peninsula (AP) ice‐shelf height change using data from four satellite radar altimeters (ERS‐1, ERS‐2, Envisat, and CryoSat‐2). Combining these time series with output from atmospheric and firn models, we partitioned the total height‐change signal into contributions from varying surface mass balance, firn state, ice dynamics, and basal mass balance. On the Bellingshausen coast of the AP, ice shelves lost 84 ± 34 Gt a−1 to basal melting, compared to contributions of 50 ± 7 Gt a−1 from surface mass balance and ice dynamics. Net basal melting on the Weddell coast was 51 ± 71 Gt a−1. Recent changes in ice‐shelf height include increases over major AP ice shelves driven by changes in firn state. Basal melt rates near Bawden Ice Rise, a major pinning point of Larsen C Ice Shelf, showed large increases, potentially leading to substantial loss of buttressing if sustained.

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Increased ice flow in Western Palmer Land linked to ocean melting

Cited by 70 publications

References 66 publications

Modelling the climate and surface mass balance of polar ice sheets using RACMO2, part 2: Antarctica (1979–2016)

Modelling the climate and surface mass balance of polar ice sheets using RACMO2, part 2: Antarctica (1979–2016)

Dynamic response of Antarctic Peninsula Ice Sheet to collapse of Larsen C and George VI ice shelves

Variable Basal Melt Rates of Antarctic Peninsula Ice Shelves, 1994–2016

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