Monitoring Glacier Changes on the Antarctic Peninsula

Arigony-Neto, Jorge; Skvarca, Pedro; Marinsek, Sebastián; Braun, Matthias; Humbert, Angelika; Júnior, Cláudio Wilson Mendes; Jaña, Ricardo

doi:10.1007/978-3-540-79818-7_30

Cited by 13 publications

(16 citation statements)

References 72 publications

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“…The AP has a polar-to-subpolar maritime climate, but the climatic and oceanographic regime varies across the AP, causing varying glacier dynamics (Arigony-Neto et al, 2014). The often polythermal glaciers experience a distinct melting period in austral summer, particularly the glaciers in the northern part of the AP.…”

Section: Study Regionmentioning

confidence: 99%

“…2). They digitized the AP coastline and some islands in that data set based on images acquired by Landsat 7 between 2000 and 2002 for the LIMA (Bindschadler et al, 2008). Since the DEM misses some islands around the AP, mainly in the central western region, the drainage divide analysis is missing for these regions.…”

Section: Catchment Outlinesmentioning

confidence: 99%

“…They used other sources, such as LIMA (Bindschadler et al, 2008) and the MODIS Mosaic of Antarctica (Haran et al, 2013), as a guide to refine the drainage divides. Icesheet drainage systems were delineated to identify regions that are broadly homogeneous regarding surface slope orientation relative to atmospheric advection and denoting the icesheet areas feeding large ice shelves.…”

Section: Antarctic Ice-sheet Drainage Dividesmentioning

confidence: 99%

“…Conversely, for Graham Land, representing the part of the AP north of 70 • S, several more specific data sets exist that could be combined for a full and coherent glacier inventory: a detailed 100 m resolution DEM was prepared by Cook et al (2012); glacier catchment outlines based on this DEM and the Landsat Image Mosaic of Antarctica (LIMA; Bindschadler et al, 2008) were derived by Cook et al (2014); a recently updated data set of rock outcrops for all of Antarctica is available from the Antarctic Digital Database (ADD; http: //www.add.scar.org/home/add7); a modeled raster data set of bedrock topography is available from Huss and Farinotti (2014).…”

Section: Introductionmentioning

confidence: 99%

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A complete glacier inventory of the Antarctic Peninsula based on Landsat 7 images from 2000 to 2002 and other preexisting data sets

Huber¹,

Cook

Paul³

et al. 2017

Earth Syst. Sci. Data

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Abstract. The glaciers on the Antarctic Peninsula (AP) potentially make a large contribution to sea level rise. However, this contribution has been difficult to estimate since no complete glacier inventory (outlines, attributes, separation from the ice sheet) is available. This work fills the gap and presents a new glacier inventory of the AP north of 70 • S, based on digitally combining preexisting data sets with geographic information system (GIS) techniques. Rock outcrops have been removed from the glacier basin outlines of Cook et al. (2014) by intersection with the latest layer of the Antarctic Digital Database (Burton-Johnson et al., 2016). Glacier-specific topographic parameters (e.g., mean elevation, slope and aspect) as well as hypsometry have been calculated from the DEM of Cook et al. (2012). We also assigned connectivity levels to all glaciers following the concept by Rastner et al. (2012). Moreover, the bedrock data set of Huss and Farinotti (2014) enabled us to add ice thickness and volume for each glacier.The new inventory is available from the Global Land Ice Measurements from Space (GLIMS) database (doi:10.7265/N5V98602) and consists of 1589 glaciers covering an area of 95 273 km 2 , slightly more than the 89 720 km 2 covered by glaciers surrounding the Greenland Ice Sheet. Hence, compared to the preexisting data set of Cook et al. (2014), this data set covers a smaller area and one glacier less due to the intersection with the rock outcrop data set. The total estimated ice volume is 34 590 km 3 , of which one-third is below sea level. The hypsometric curve has a bimodal shape due to the unique topography of the AP, which consists mainly of ice caps with outlet glaciers. Most of the glacierized area is located at 200-500 m a.s.l., with a secondary maximum at 1500-1900 m. Approximately 63 % of the area is drained by marine-terminating glaciers, and ice-shelf tributary glaciers cover 35 % of the area. This combination indicates a high sensitivity of the glaciers to climate change for several reasons: (1) only slightly rising equilibrium-line altitudes would expose huge additional areas to ablation, (2) rising ocean temperatures increase melting of marine terminating glaciers, and (3) ice shelves have a buttressing effect on their feeding glaciers and their collapse would alter glacier dynamics and strongly enhance ice loss (Rott et al., 2011). The new inventory should facilitate modeling of the related effects using approaches tailored to glaciers for a more accurate determination of their future evolution and contribution to sea level rise.

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Section: Study Regionmentioning

confidence: 99%

Section: Catchment Outlinesmentioning

confidence: 99%

Section: Antarctic Ice-sheet Drainage Dividesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A complete glacier inventory of the Antarctic Peninsula based on Landsat 7 images from 2000 to 2002 and other preexisting data sets

Huber¹,

Cook

Paul³

et al. 2017

Earth Syst. Sci. Data

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“…1a; Scambos et al, 2009Scambos et al, , 2000. Based on the analysis of time series of satellite imagery and historic maps, numerous break-up stages were described (Arigony-Neto et al, 2014). Several causes for break up at WIS were proposed in the literature: fracture formation due to bending stresses in combination with surface melt or brine infiltration (Scambos et al, 2009), transoceanic infragravity waves that induce fractures at Antarctic ice shelves (Bromirski et al, 2010) and break up due to bending stresses caused by enhanced basal melt Humbert et al, 2010).…”

Section: Regional Settings and Retreat History Of The Wilkins Ice Shelfmentioning

confidence: 99%

Dynamic changes on the Wilkins Ice Shelf during the 2006–2009 retreat derived from satellite observations

et al. 2017

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Abstract. The vast ice shelves around Antarctica provide significant restraint to the outflow from adjacent tributary glaciers. This important buttressing effect became apparent in the last decades, when outlet glaciers accelerated considerably after several ice shelves were lost around the Antarctic Peninsula (AP). The present study aims to assess dynamic changes on the Wilkins Ice Shelf (WIS) during different stages of ice-front retreat and partial collapse between early 2008 and 2009. The total ice-shelf area lost in these events was 2135 ± 75 km2 ( ∼  15 % of the ice-shelf area relative to 2007). Here, we use time series of synthetic aperture radar (SAR) satellite observations (1994–1996, 2006–2010) in order to derive variations in surface-flow speed from intensity-offset tracking. Spatial patterns of horizontal strain-rate, stress and stress-flow angle distributions are determined during different ice-front retreat stages. Prior to the final break up of an ice bridge in 2008, a strong speed up is observed, which is also discernible from other derived quantities. We identify areas that are important for buttressing and areas prone to fracturing using in-flow and first principal strain rates as well as principal stress components. Further propagation of fractures can be explained as the first principal components of strain rates and stresses exceed documented threshold values. Positive second principal stresses are another scale-free indicator for ice-shelf areas, where fractures preferentially open. Second principal strain rates are found to be insensitive to ice-front retreat or fracturing. Changes in stress-flow angles highlight similar areas as the in-flow strain rates but are difficult to interpret. Our study reveals the large potential of modern SAR satellite time series to better understand dynamic and structural changes during ice-shelf retreat but also points to uncertainties introduced by the methods applied.

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A comparative analysis between variations in wet snow zone and the main break-up and disintegration events in WILKINS ice shelf, Antarctic peninsula

Lemos

Arigony-Neto

Mendes-Júnior

et al. 2019

Global and Planetary Change

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Monitoring Glacier Changes on the Antarctic Peninsula

Cited by 13 publications

References 72 publications

A complete glacier inventory of the Antarctic Peninsula based on Landsat 7 images from 2000 to 2002 and other preexisting data sets

A complete glacier inventory of the Antarctic Peninsula based on Landsat 7 images from 2000 to 2002 and other preexisting data sets

Dynamic changes on the Wilkins Ice Shelf during the 2006–2009 retreat derived from satellite observations

A comparative analysis between variations in wet snow zone and the main break-up and disintegration events in WILKINS ice shelf, Antarctic peninsula

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