Article
Geography, Physical
Michael-Shawn Fletcher, Joel Pedro, Tegan Hall, Michela Mariani, Joseph A. Alexander, Kristen Beck, Maarten Blaauw, Dominic A. Hodgson, Henk Heijnis, Patricia S. Gadd, Agathe Lise-Pronovost
Summary: Climate change during the last deglaciation was potentially influenced by the southern westerlies' latitudinal shifts, affecting CO2 out-gassing from the Southern Ocean. The last deglaciation in the Southern Hemisphere was interrupted by a cooling event, coinciding with a warm phase in the North Atlantic. Research shows a migration of the westerlies during the last deglaciation, driving the rise in atmospheric CO2.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Levan G. Tielidze, Shaun R. Eaves, Kevin P. Norton, Andrew N. Mackintosh, Alan J. Hidy
Summary: This study presents the first glacial chronology dataset from the Ahuriri River valley in the Southern Alps, New Zealand, based on beryllium-10 surface-exposure ages. The results reveal that the former Ahuriri Glacier reached its maximum extent at 19.8 ka and retreated 18 km up-valley by 16.7 ka. The estimated equilibrium-line altitude suggests colder temperatures during these periods compared to the present, with a temperature difference of 5°C and 4.4°C, respectively. This research provides new insights into the glacier behavior and climate conditions in New Zealand during the Last Glacial Maximum.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
M. Pauly, C. S. M. Turney, J. G. Palmer, U. Buntgen, A. Brauer, G. Helle
Summary: The Late Glacial dynamics have been demonstrated by records from the North Hemisphere and fewer from the South. New Zealand subfossil kauri tree-rings show a simultaneous downturn around 12,625-12,375 cal BP, indicating a widespread climate deterioration with high precipitation and low temperatures. The study provides new evidence of hydroclimate conditions during the Late Glacial in New Zealand.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Jonathan L. Carrivick, Jenna L. Sutherland, Matthias Huss, Heather Purdie, Christopher D. Stringer, Michael Grimes, William H. M. James, Andrew M. Lorrey
Summary: This study provides an overview of glacier ice loss in the Southern Alps of New Zealand, analyzes ice marginal lake development, predicts the future position and size of lakes using modeled glacier ice thickness, and utilizes a glacier evolution model to estimate the timing and rate of future lake formation. The findings highlight the relationship between glacier mass balance and lake growth, and project an increase in ice-marginal lakes in size followed by a decrease as glaciers disconnect from them. The results have implications for glacier evolution models, landscape evolution studies, and future water resources and quality.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Meteorology & Atmospheric Sciences
Manja Zebre, Renato R. Colucci, Filippo Giorgi, Neil F. Glasser, Adina E. Racoviteanu, Costanza Del Gobbo
Summary: Research has reconstructed the environmental equilibrium-line altitude (ELA) in the European Alps based on climate records and model projections. It is projected that the environmental ELA will continue to rise in the future, potentially leading to further glacier melting.
Article
Geosciences, Multidisciplinary
Joseph A. Stewart, Tao Li, Peter T. Spooner, Andrea Burke, Tianyu Chen, Jenny Roberts, James W. B. Rae, Victoria Peck, Sev Kender, Qian Liu, Laura F. Robinson
Summary: During the Antarctic Cold Reversal, peak abundances of thick-walled benthic foraminifera Uvigerina bifurcata and corals were observed at shallow depths in the sub-Antarctic, while coral populations at greater depths and further south diminished. The ecological and geochemical data suggest that habitat shifts were driven by a northward migration of food supply into the sub-Antarctic Zone and poorly oxygenated seawater at depth during this Antarctic cooling interval.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Geochemistry & Geophysics
Yilun Shao, David J. J. Prior, James M. M. Scott, Steven B. B. Kidder, Marianne Negrini
Summary: Mantle xenoliths from the Southern Alps in New Zealand provide insight into the origin of mantle seismic anisotropy related to the Australian-Pacific plate boundary. These xenoliths, including protomylonites and coarse-grained samples, record different deformation kinematics and crystallographic preferred orientations. The microstructures suggest that protomylonites may represent an up-strain progression of subgrain rotation recrystallization, contributing to the development of a new Alpine Fault crystallographic preferred orientation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Meteorology & Atmospheric Sciences
Michael James Salinger, Brian Blair Fitzharris, Trevor Chinn
Summary: New Zealand has been continuously measuring the altitude of end-of-summer snowlines for over four decades, showing a significant increase in recent decades. EOSSALPS is not only related to temperature, but also influenced by regional climate indices and hemispheric scale climate teleconnections.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Geochemistry & Geophysics
Isaac J. Larsen, Andre Eger, Peter C. Almond, Evan A. Thaler, J. Michael Rhodes, Guenther Prasicek
Summary: Chemical weathering affects biogeochemical cycling, climate, and ecosystem function. Physical erosion affects chemical weathering rates by supplying fresh minerals to the critical zone. Vegetation affects chemical weathering rates through physical processes and acid production. However, the role of vegetation in different landscapes is unclear.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geography, Physical
M. Civel-Mazens, X. Crosta, G. Cortese, E. Michel, A. Mazaud, O. Ther, M. Ikehara, T. Itaki
Summary: In the Southern Ocean, climate-driven latitudinal migrations of the Antarctic Circumpolar Current frontal system impact ocean circulation and primary productivity. The Antarctic Polar Front's migrations influence nutrient redistribution, biodiversity, and the soft tissue carbon pump in the modern Southern Ocean.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Meteorology & Atmospheric Sciences
Rasool Porhemmat, Heather Purdie, Peyman Zawar-Reza, Christian Zammit, Tim Kerr
Summary: The study utilized data from automatic weather stations to identify large snowfall events in the New Zealand Southern Alps from 2010 to 2018, finding that these events are associated with strong water vapor transport and deepening low pressure systems, with most being triggered by atmospheric rivers, characterized by increases in low- and midlevel moisture at 700-850 hPa and enhanced meridional winds at 750-850 hPa.
JOURNAL OF HYDROMETEOROLOGY
(2021)
Article
Ecology
Ganges Lim, K. C. Burns
Summary: This study investigated the fruit colour polymorphism in Gaultheria depressa var. novae-zealandiae and found that the frequencies of different fruit colour morphs varied geographically to maximize fruit-foliage colour contrasts. The study also showed that different fruit colour morphs varied in their susceptibility to UV damage. This research highlights the importance of trade-offs between conspicuousness to dispersers and tolerance to UV damage in maintaining the fruit colour polymorphism.
Article
Geosciences, Multidisciplinary
Lukas Rettig, Giovanni Monegato, Matteo Spagnolo, Irka Hajdas, Paolo Mozzi
Summary: Glacier-based reconstructions of Equilibrium Line Altitudes (ELAs) are crucial for understanding long-term changes in temperature and precipitation. Our study focuses on the south-eastern part of the European Alps during the Last Glacial Maximum (LGM), providing new insights into the ELA based on geomorphological evidence.
Article
Geosciences, Multidisciplinary
Duna C. Roda-Boluda, Taylor F. Schildgen, Hella Wittmann, Stefanie Tofelde, Aaron Bufe, Jeff Prancevic, Niels Hovius
Summary: Examining the links between tectonics and climate, this study finds that temperature-controlled erosion processes at 1,500-2,000 meters above sea level can play a greater role in modulating erosion than precipitation or glaciation. These temperature-controlled erosional processes may be efficient enough to balance the fastest rock-uplift rates on Earth, contributing to the link between tectonics and climate.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Meteorology & Atmospheric Sciences
Bibi Nariefa Abrahim, Nicolas James Cullen, Jonathan Paul Conway
Summary: High-altitude observations of mountain meteorology in the Southern Alps are rare but important for detecting changes in seasonal snow and glacier extent. A unique in situ analysis of surface meteorology, including radiative forcing from clouds, was conducted near Brewster Glacier in the Southern Alps of New Zealand over the period 2010-2020. The study found that winter snow covers Brewster Glacier between June and November, with rainfall accounting for more than half of total precipitation.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Geology
Philippa Morris, Timothy Little, Russ Van Dissen, Matthew Hill, Mark Hemphill-Haley, Jesse Kearse, Kevin Norton
Summary: During the Kaikoura earthquake, a paleoseismic trench experienced the largest globally recorded displacement, resulting from dextral slip on two faults and coseismic rotation and deformation in a central zone. Comparison of pre- and post-earthquake trench logs suggests that the expression of strike-slip ruptures can change over time, highlighting the importance of temporal unpredictability in defining fault zones. The 2016 earthquake created compressive structures contrasting with previous normal-sense dip separations, indicating the influence of small changes in slip kinematics on rupture zone structures.
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
(2023)
Article
Geography, Physical
Emily M. M. Moore, Shaun R. Eaves, Kevin P. Norton, Andrew N. Mackintosh, Brian M. Anderson, Lisa H. Dowling, Alan J. Hidy
Summary: Mountain glacier records provide important constraints on climate variability during the last glacial cycle. A new study in New Zealand reveals the role of climate in driving regional ice volume decline during marine isotope stages 3-2, with close spacing and good preservation of moraines from 19-17 ka supporting this finding. Onset of warming after 17.2 ka is consistent with evidence for a sustained southward shift in the southern westerly winds, promoting deglaciation.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Clare Wilkinson, Timothy Stahl, Katie Jones, Toshiyuki Fujioka, David Fink, Kevin P. Norton
Summary: Large earthquakes have a significant impact on the topographic evolution of active mountain ranges. In this study, the researchers analyzed in-situ Be-10 concentrations in fluvial sediments to understand the post-earthquake denudation rates of the Conway River catchment in New Zealand. The results showed higher erosion rates at the rangefront compared to the river outlet, and the overall erosion rates were consistent with previous studies.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geology
Philippa Morris, Timothy Little, Russ Van Dissen, Mark Hemphill-Haley, Jesse Kearse, Matthew Hill, Jessie Vermeer, Kevin Norton
Summary: The 2016 Kaikoura earthquake provided rare opportunities to evaluate ground deformation during a large strike-slip earthquake. The study collected samples and re-excavated paleoseismic trenches to refine and extend the known chronology of surface rupturing earthquakes on the Kekerengu Fault. The findings reveal six surface rupturing earthquakes on the fault since approximately 2000 cal. B.P.
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
(2023)
Article
Engineering, Geological
Shaun R. Eaves, Samuel T. McColl, Levan G. Tielidze, Kevin P. Norton, Jenni L. Hopkins, Alan J. Hidy
Summary: Landslide deposits in the geological record provide valuable information for hazard and risk models when observational records are limited. By studying the Green Lake Landslide in New Zealand, researchers have found that it is one of the largest subaerial landslides on Earth. They suggest that the landslide was most likely triggered by seismic shaking, but local geological structure and glacial debuttressing may have also played a role. The age of the landslide compared to glacier retreat supports these conclusions.
Article
Geosciences, Multidisciplinary
Marjolaine Verret, Cassandra Trinh-Le, Warren Dickinson, Kevin Norton, Denis Lacelle, Marcus Christl, Richard Levy, Tim Naish
Summary: Continental-scale ice sheets have covered Antarctica since around 33.9 million years ago. The sequence of events that led to the persistent ice sheet in East Antarctica remains disputed. By assessing meteoric beryllium-10 profiles, researchers have found that the polar aridity in high elevations of East Antarctica began in the late Miocene. This finding suggests that the McMurdo Dry Valleys may be more susceptible to climate change than previously believed.
Article
Geosciences, Multidisciplinary
Levan G. G. Tielidze, Alessandro Cicoira, Gennady A. A. Nosenko, Shaun R. R. Eaves
Summary: This study produces the first inventory of rock glaciers in the Greater Caucasus region, using remote sensing survey and GIS technology. A total of 1461 rock glaciers with an area of 297.8 square kilometers were identified, with 67% being active glaciers. This inventory provides an important database for understanding the extent of permafrost in the Greater Caucasus.
Article
Geography, Physical
Jamey Stutz, Shaun Eaves, Kevin Norton, Klaus M. Wilcken, Claudia Moore, Rob Mckay, Dan Lowry, Kathy Licht, Katelyn Johnson
Summary: Geomorphological records provide insights into the response of glaciers to changing boundary conditions. The study reveals rapid thinning of Byrd Glacier in the past, with simulations suggesting that basal sliding and friction play important roles in glacier thinning.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Jokotola Omidiji, Wayne Stephenson, Kevin Norton
Summary: This study used both SfM photogrammetry and MEM to investigate erosion rates on intertidal shore platforms and marine terraces in Kaikoura Peninsula, New Zealand. The results showed that the erosion rates measured by MEM were lower than those measured by SfM. Additionally, the SfM technique revealed erosion details at both micro and meso scales.
Article
Geography
Levan G. Tielidze, Joanna Charton, Vincent Jomelli, Olga N. Solomina
Summary: This study presents the first detailed glacial geomorphological mapping of the Notsarula and Chanchakhi river valleys in the Georgian Caucasus, providing valuable information for paleoglaciological reconstructions. The mapped landforms indicate multiple readvance or stillstands of valley glaciers, particularly in the Bubistskali River gorge.
Article
Multidisciplinary Sciences
Kane Fleury, Emma Burns, Marcus Richards, Kevin Norton, Stephen Read, Rachel Wesley, R. Ewan Fordyce, Klaus Wilcken
Summary: In this study, the first known occurrence of moa footprints in South Island, New Zealand was described. These footprints provide insights into the size and speed of moa, with one trackway maker identified as a moa from the genus Pachyornis and a single adjacent footprint attributed to an individual from the genus Dinornis. Cosmogenic nuclide dating established a minimum age for the tracks, placing them in the Late Pliocene to Early Pleistocene period.
JOURNAL OF THE ROYAL SOCIETY OF NEW ZEALAND
(2023)
Article
Geography, Physical
Levan G. Tielidze, Gennady A. Nosenko, Tatiana E. Khromova, Frank Paul
Summary: An updated glacier inventory reveals a significant reduction in glacier area in the Greater Caucasus region over the past 20 years. The study compares glacier data from 2000 to 2020 and finds a 23.2% decrease in total glacier area. The research also highlights variations in glacier shrinkage and mean elevation across different regions.