A5019259034- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Science and Climate Studies
- Earthquake Detection and Analysis
- Peatlands and Wetlands Ecology
- Coastal wetland ecosystem dynamics
- Archaeology and ancient environmental studies
- Historical Geography and Geographical Thought
Leeds Beckett University
2022-2025
University of Leeds
2019-2022
Royal Holloway University of London
2020
Liverpool Hospital
1843
Abstract Ice‐contact proglacial lakes are generally absent from numerical model simulations of glacier evolution, and their effects on ice dynamics rates deglaciation remain poorly quantified. Using the BISICLES flow model, we analyzed an ice‐contact lake Pukaki Glacier, New Zealand, during recession Last Glacial Maximum. The produced a maximum effect grounding line >4 times further velocities up to 8 faster, compared land‐terminating forced by same climate. contributed 82% cumulative 87%...
Global climate change is evidently manifest in disappearing mountain glaciers and receding thinning ice sheet margins. Concern about contemporaneous proglacial lake development has spurred an emerging area of research seeking to quantitatively understand - glacier interactions. This perspectives article identifies spatio-temporal disparity between the coverage field data, remote sensing observations numerical modelling efforts. Throughout, overview physical effects ice-marginal lakes on...
Abstract Glaciers and ice caps (GICs) are important contributors of meltwater runoff to global sea level rise. However, knowledge GIC mass changes is largely restricted the last few decades. Here we show extent 5327 Greenland GICs during Little Ice Age (LIA) termination (1900) reveal that they have fragmented into 5467 glaciers in 2001, losing at least 587 km 3 from their ablation areas, equating 499 Gt a rate 4.34 yr −1 . We estimate long‐term mean balance glacier areas has been −0.18 −0.22...
Rapid changes observed today in mountain glaciers need to be put into a longer-term context understand global sea-level contributions, regional climate-glacier systems and local landscape evolution. In this study we determined volume for 400 across the Southern Alps, New Zealand three time periods; pre-industrial "Little Ice Age (LIA)" 1978, 1978 2009 2019. At least 60 km3 ± 12 or between 41 62% of LIA total ice has been lost. The rate mass loss nearly doubled from - 0.4 m w.e year-1 during...
Abstract Ice‐marginal lakes can affect glacier dynamics but are ignored in studies of the evolution Greenland ice sheet (GrIS) and peripheral mountain glaciers caps (PGICs). Here we show that occupy 10% GrIS margin occur on 5% PGICs. Ice velocity at is enhanced by ∼ 25% versus land. Mean discharge into ∼4.9 Gt.yr, which ∼1% discharged through marine termini. We locate thousands subglacial overdeepenings within 7,404 km 2 future could form, all will be ice‐marginal some time. Future west east...
Global glacier mass loss is causing expansion of proglacial landscapes and producing meltwater that can become impounded as lakes within natural topographic depressions or 'overdeepenings'. It important to understand the evolution these for water resources, hazards ecosystem services. In this study we (i) overview contemporary ice across Southern Alps New Zealand, (ii) analyse ice-marginal lake development since 1980s, (iii) utilise modelled thickness suggest position size future lakes, (iv)...
Abstract Nascent peatlands represent an emerging, nature‐based carbon sink in the global climate system. A warming and changing precipitation regime could drive peat initiation beyond current latitudinal altitudinal boundaries of peatland bioclimatic envelope, through increases plant productivity moisture availability, with potential implications for radiative forcing. However, contemporaneous observations new formation remain scarce. We investigate within deglaciating Rob Roy valley...
Proglacial lakes can affect the stability of mountain glaciers and partly disengage glacier behaviour from climatic perturbations. However, their role in controlling onset progression deglaciation Last Glacial Maximum (LGM) remains poorly understood. This lack understanding is because evidence required to consistently robustly identify location evolution ice-contact not standardised. In this paper we therefore firstly present a new set criteria for identifying landform sedimentary that...
Quaternary glaciations have created impressive landform assemblages that can be used to understand palaeo-glacier extent, character and behaviour, hence past global local glacier forcings. However, in the southern hemisphere especially New Zealand, glacial record is relatively poorly investigated with regard glaciological properties. In this study, a 1 m digital elevation model (DEM) was generated from airborne LiDAR data supplemented aerial imagery field observations analyse exceptionally...
Abstract The centennial response of land‐terminating glaciers in Greenland to climate change is largely unknown. Yet, such information important understand ongoing changes and for projecting the future evolution Arctic subpolar glaciers, meltwater runoff, sediment fluxes. This paper analyses topography, geomorphology, sedimentology prominent moraine ridges proglacial areas ice cap outlet on Qaanaaq peninsula (Piulip Nunaa). We determine geometric since neoglacial maximum; Little Ice Age...
Abstract We present the first systematic inventory of surge-type glaciers for whole Greenland compiled from published datasets and multitemporal satellite images digital elevation models. The allows us to define spatial climatic distribution analyse timing surges 1985 2019. identified 274 glaciers, an increase 37% compared previous work. Mapping glacier by temperature precipitation variables derived ERA5-Land reanalysis data shows that west east clusters occur in well-defined envelopes....
The extent of the Southern Alps icefield in New Zealand is well-constrained chronologically for last glacial cycle. sediment-landform imprint this system, however, offers insight into ice-marginal processes that chronological control cannot. We present first detailed investigation sediments along southwestern shores Lake Tekapo, South Island. identify seven lithofacies, from which a five-stage palaeoglaciological reconstruction depositional and glaciotectonic events proposed: (i) advance...
"On the theory of glaciers, with reference to a former communication." The London, Edinburgh, and Dublin Philosophical Magazine Journal Science, 22(147), pp. 495–496
<p>Mountain glaciers and ice caps are undergoing rapid mass loss but rates of contemporary change lack long-term (centennial-scale) context. Future projections glacier changes require spin up to present day conditions thus baseline extents volumes a prerequisite for model validation.<strong> </strong>Here, we reconstruct the Little Ice Age maximum extent surface Jostedalsbreen, which is largest in mainland Europe. Jostedalsbreen had its (LIA) about...
<p>Mountain glaciers are rapidly diminishing and causing widespread environmental socio-economic concern. The stability of mountain is influenced by the expansion proglacial landscapes meltwater impounded as lakes within natural topographic depressions or ‘overdeepenings’. In particular, relative sensitivity mid-latitude to modern climate change makes them especially important consider. One most striking features South Island, New Zealand, sequence...