Late Quaternary evolution of Reedy Glacier, Antarctica

Todd, Claire; Stone, John O.; Conway, H.; Hall, Brenda L.; Bromley, Gordon

doi:10.1016/j.quascirev.2010.02.001

Cited by 87 publications

(100 citation statements)

References 37 publications

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“…As a result the combined effect of glacial thinning and grounding-line retreat is strongest at the margins (e.g. Schoof, 2007;Todd et al, 2010). This is coherent with the observation that the near-coast site (MI) yielded older ages than the inland site (BB).…”

Section: Discussionsupporting

confidence: 77%

“…Therefore areas close to the ice margin are affected equally by thinning and by retreat, whereas central regions are more strongly influenced by thinning (e.g. Todd et al, 2010). The Kohler Range samples show such an inverted age-elevation relationship, with the lower (and more coastal) sample yielding an older age.…”

Section: Kohler Range: Simple Ice-sheet Modelingmentioning

confidence: 98%

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Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Lindow

Castex

Wittmann

et al. 2014

Quaternary Science Reviews

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a b s t r a c tThe Amundsen Sea Embayment of West Antarctica hosts one of the most rapidly changing sectors of the West Antarctic Ice Sheet. With the fastest-flowing ice streams in Antarctica, the region around Pine Island Bay is characterized by rapid ice-sheet thinning and grounding-line retreat. Published surfaceexposure data are limited to a few isolated nunataks making it difficult to assess the long-term deglacial history of the area. To address this, we correlate existing records of lateral ice-stream retreat from marine sediment cores with onshore glacial thinning in two key areas of eastern Marie Byrd Land: the Kohler Range and Pine Island Bay. Our 10 Be surface-exposure ages are the first from the isolated Kohler Range and show that the nunataks there became ice-free between 8.6 and 12.6 ka. This implies a minimum long-term average thinning rate of 3.3 ± 0.3 cm/yr, which is one order of magnitude lower than recent rates based on satellite data. We also present pre-to early Holocene 10 Be surface-exposure ages from two islands located approximately 80 km downstream of the Pine Island Glacier ice-shelf front to constrain the lateral deglacial history in the Pine Island Bay area. This study provides insight into the significance of local ice sheet variations and suggests that the post-LGM history in the Amundsen Sea sector was characterized by glacial thinning as well as lateral retreat in pre-to early Holocene times.

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Section: Discussionsupporting

confidence: 77%

Section: Kohler Range: Simple Ice-sheet Modelingmentioning

confidence: 98%

Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Lindow

Castex

Wittmann

et al. 2014

Quaternary Science Reviews

View full text Add to dashboard Cite

show abstract

“…7, are characterized by a mid-Holocene highstand (Peltier, 2004). The SSI data are consistent with other Antarctic RSL curves (i.e., Baroni and Hall, 2004), as well as glacial geologic data (i.e., Conway et al, 1999;Hall, 2009;Todd et al, 2010), in that they suggest predominantly Holocene ice recession. This timing is in accord with the ICE-5G model, which suggests that Antarctic deglaciation lagged that of the Northern Hemisphere by thousands of years (Peltier, 2004) and does not lend support to models that place large ice loss in Antarctica at the time of meltwater pulse 1A (i.e., Bassett et al, 2007).…”

Section: Relationship Between Rsl and Glaciationsupporting

confidence: 84%

Holocene relative sea-level changes and ice fluctuations in the South Shetland Islands

Hall

2010

Global and Planetary Change

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“…The third and fourth lines use the trend computed using the SLR time series (X = −0.131, Y = 0.352, Z = −0.637) minus the GIA geocenter motion given in Wu et al (2012) dences, and we use them together with the Riva et al (2009) empirical GIA model. One reason for the GIA overestimate can be the excess of ice melting during the LGM for the traditional ice models (ICE5g, IJ05), which clearly violates the geological evidence on the ice history (Todd et al, 2010;Ackert et al, 2011;Mackintosh et al, 2011). However due to the tradeoff between ice history and solid Earth response in GIA, another way to predict a smaller present-day signal in Antarctica is to choose a lower-viscosity profile, especially in the western part where the majority of the deglaciation took place.…”

Section: Glacial Isostatic Adjustmentmentioning

confidence: 98%

Scatter of mass changes estimates at basin scale for Greenland and Antarctica

Barletta¹,

Sørensen²,

Forsberg³

2013

The Cryosphere

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Abstract. During the last decade, the GRACE mission has provided valuable data for determining the mass changes of the Greenland and Antarctic ice sheets. Yet, discrepancies still exist in the published mass balance results, and comprehensive analyses on the sources of errors and discrepancies are lacking. Here, we present monthly mass changes together with trends derived from GRACE data at basin scale for both the Greenland and Antarctic ice sheets, and we assess the variability and errors for each of the possible sources of discrepancies, and we do this in an unprecedented systematic way, taking into account mass inference methods, data sets and background models. We find a very good agreement between the monthly mass change results derived from two independent methods, which represents a cross validation. For the monthly solutions, we find that most of the scatter is caused by the use of the two different data sets rather than the two different methods applied. Besides the well-known GIA trend uncertainty, we find that the geocenter motion and the recent de-aliasing corrections significantly impact the trends, with contributions of +13.2 Gt yr −1 and −20 Gt yr −1 , respectively, for Antarctica, which is more affected by these than Greenland. We show differences between the use of release RL04 and the new RL05 and confirm a lower noise content in the new release. The overall scatter of the solutions well exceeds the uncertainties propagated from the data errors and the leakage (as done in the past); hence we calculate new sound total errors for the monthly solutions and the trends.We find that the scatter in the monthly solutions caused by applying different estimates of geocenter motion time series (degree-1 corrections) is significant -contributing with up to 40% of the total error.For the whole GRACE period (2003-2011) our trend estimate for Greenland is −234 ±20 Gt yr −1 and −83 ± 36 Gt yr −1 for Antarctica (−111 ± 15 Gt yr −1 in the western part). We also find a clear (with respect to our errors) increase of mass loss in the last four years.

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Late Quaternary evolution of Reedy Glacier, Antarctica

Cited by 87 publications

References 37 publications

Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Holocene relative sea-level changes and ice fluctuations in the South Shetland Islands

Scatter of mass changes estimates at basin scale for Greenland and Antarctica

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