ORCID Profile
0000-0002-4836-0078
Current Organisations
Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich
,
Swiss Federal Institute for Forest, Snow and Landscape Research
,
Victoria University of Wellington
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Publications
Using structure from motion photogrammetry to measure past glacier changes from historic aerial photographs
Publisher: Cambridge University Press (CUP)
Date: 12-2017
DOI: 10.1017/JOG.2017.79
Abstract: Quantifying historic changes in glacier size and mass balance is important for understanding how the cryosphere responds to climate variability and change. Airborne photogrammetry enables glacier extent and equilibrium line altitudes (ELAs) to be monitored for more glaciers at lower cost than traditional mass-balance programs and other remote-sensing techniques. Since 1977, end-of-summer-snowlines, which are a proxy for annual ELAs, have been recorded for 50 glaciers in the Southern Alps of New Zealand using oblique aerial photographs. In this study, we use structure from motion photogrammetry to estimate the camera parameters, including position, for historic photographs, which we then use to measure glacier change. We apply this method to a small maritime New Zealand glacier (Brewster Glacier, 1670–2400 m a.s.l.) to derive annual ELA and length records between 1981 and 2017, and quantify the uncertainties associated with the method. Our length reconstruction shows largely continuous terminus retreat of 365 ± 12 m for Brewster Glacier since 1981. The ELA record, which compares well with glaciological mass-balance data measured between 2005 and 2015, shows pronounced interannual variability. Mean ELAs range from 1707 ± 6 to 2303 ± 5 m a.s.l., with the highest ELAs occurring in the last decade.
Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice
Publisher: Springer Science and Business Media LLC
Date: 09-09-2021
Continued deceleration of Whillans Ice Stream, West Antarctica
Publisher: American Geophysical Union (AGU)
Date: 11-2005
DOI: 10.1029/2005GL024319
Anthropogenic warming forces extreme annual glacier mass loss
Publisher: Springer Science and Business Media LLC
Date: 03-08-2020
Earthquakes drive large-scale submarine canyon development and sediment supply to deep-ocean basins
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-03-2018
Abstract: Coseismic canyon flushing reveals how earthquakes drive canyon development and deep-sea sediment dispersal on active margins.
An 11-year record of mass balance of Brewster Glacier, New Zealand, determined using a geostatistical approach
Publisher: Cambridge University Press (CUP)
Date: 12-2016
DOI: 10.1017/JOG.2016.128
Abstract: Recognising the scarcity of glacier mass-balance data in the Southern Hemisphere, a mass-balance measurement programme was started at Brewster Glacier in the Southern Alps of New Zealand in 2004. Evolution of the measurement regime over the 11 years of data recorded means there are differences in the spatial density of data obtained. To ensure the temporal integrity of the dataset a new geostatistical approach is developed to calculate mass balance. Spatial co-variance between elevation and snow depth allows a digital elevation model to be used in a co-kriging approach to develop a snow depth index ( SDI ). By capturing the observed spatial variability in snow depth, the SDI is a more reliable predictor than elevation and is used to adjust each year of measurements consistently despite variability in s ling spatial density. The SDI also resolves the spatial structure of summer balance better than elevation. Co-kriging is used again to spatially interpolate a derived mean summer balance index using SDI as a co-variate, which yields a spatial predictor for summer balance. The average glacier-wide surface winter, summer and annual balances over the period 2005–15 are 2484, −2586 and −102 mm w.e., respectively, with changes in summer balance explaining most of the variability in annual balance.
Related Organisations
Laboratory Of Hydraulics, Hydrology And Glaciology (VAW), ETH Zurich
Location: Switzerland
Swiss Federal Institute For Forest, Snow And Landscape Research
Location: Switzerland
Related Funding Activities
No related grants have been discovered for Huw Horgan.