glacier change
Recently Published Documents


TOTAL DOCUMENTS

124
(FIVE YEARS 29)

H-INDEX

19
(FIVE YEARS 4)

2022 ◽  
pp. 103926
Author(s):  
Bo Su ◽  
Cunde Xiao ◽  
Deliang Chen ◽  
Yi Huang ◽  
Yanjun Che ◽  
...  

2021 ◽  
Author(s):  
◽  
Lauren Vargo

<p>Glaciers across the Southern Alps of New Zealand have been photographed annually since 1977, creating a rare record of Southern Hemisphere glacier change. Here, we revisit these historic photographs and use structure from motion photogrammetry to quantitatively measure glacier change from the images. To establish this new method, it is initially applied to Brewster Glacier (1670 – 2400 m a.s.l.), one of the 50 monitored glaciers. We derive annual equilibrium line altitude (ELA) and length records from 1981 – 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 m a.s.l. to 2303 ± 5 m a.s.l. The newly developed ELA chronology from Brewster shows several years since 1981 with especially high mass loss, all of which occurred in the past decade. Investigation using reanalysis data shows that these extreme mass-loss years occur when surface air temperatures, sea surface temperatures, and mean sea level pressure are anomalously high. In particular, the three highest mass-loss years on record, 2011, 2016, and 2018, each had a 2-month mean surface air temperature anomaly of at least +1.7°C between November and March, which is exclusive to these three years over the time investigated (April 1980 – March 2018). Using event attribution — a methodology using climate model simulations with and without human-induced forcings to calculate the anthropogenic influence on extreme events — we calculate the anthropogenic influence on these surface air temperature anomalies. The positive temperature anomalies during extreme mass-loss years have probabilities of 0 – 90% confidence) more likely to occur with anthropogenic forcing, and in once case in 2018 could not have occurred (>90% confidence) without anthropogenic forcing. This increased likelihood is driven by present-day temperatures ~1.0°C above the pre-industrial average, confirming a connection between rising anthropogenic greenhouse gases, warming temperatures, and high annual ice loss.</p>


2021 ◽  
Author(s):  
◽  
Lauren Vargo

<p>Glaciers across the Southern Alps of New Zealand have been photographed annually since 1977, creating a rare record of Southern Hemisphere glacier change. Here, we revisit these historic photographs and use structure from motion photogrammetry to quantitatively measure glacier change from the images. To establish this new method, it is initially applied to Brewster Glacier (1670 – 2400 m a.s.l.), one of the 50 monitored glaciers. We derive annual equilibrium line altitude (ELA) and length records from 1981 – 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 m a.s.l. to 2303 ± 5 m a.s.l. The newly developed ELA chronology from Brewster shows several years since 1981 with especially high mass loss, all of which occurred in the past decade. Investigation using reanalysis data shows that these extreme mass-loss years occur when surface air temperatures, sea surface temperatures, and mean sea level pressure are anomalously high. In particular, the three highest mass-loss years on record, 2011, 2016, and 2018, each had a 2-month mean surface air temperature anomaly of at least +1.7°C between November and March, which is exclusive to these three years over the time investigated (April 1980 – March 2018). Using event attribution — a methodology using climate model simulations with and without human-induced forcings to calculate the anthropogenic influence on extreme events — we calculate the anthropogenic influence on these surface air temperature anomalies. The positive temperature anomalies during extreme mass-loss years have probabilities of 0 – 90% confidence) more likely to occur with anthropogenic forcing, and in once case in 2018 could not have occurred (>90% confidence) without anthropogenic forcing. This increased likelihood is driven by present-day temperatures ~1.0°C above the pre-industrial average, confirming a connection between rising anthropogenic greenhouse gases, warming temperatures, and high annual ice loss.</p>


2021 ◽  
Vol 14 (3) ◽  
pp. 395-412
Author(s):  
Christy Tidwell

One of the many threats accompanying climate change is that of deadly viruses being revived or uncovered when the permafrost melts, as in the 2016 uncovering of anthrax in Siberia. Blood Glacier (Kren Austria 2013, originally Blutgletscher) addresses this in creature feature form, telling the story of something nasty emerging from the natural world (in this case, microorganisms emerging from a melting glacier) to threaten humans and human superiority. Blood Glacier reflects a larger twenty-first-century creature-feature trope of prehistoric creatures emerging from thawing ice as well as an expansion of ecohorror beyond familiar nature-strikes-back anxieties or fears of humans becoming food for animals. Instead, the microorganisms discovered within the glacier change people (and other animals), causing mutations and leading to the creation of new combinations of species. The film juxtaposes these environmental concerns with one character’s past abortion, which comes to represent another, more personal, challenge to Western values. As a result, the film asks questions not addressed by other similar creature features: Which life has value? What does the future look like, and who decides that? The film therefore addresses the ethics of bringing life into being, gesturing toward the responsibilities inherent both in bearing children and in choosing not to bear children. These questions are addressed in the end of the film, with the birth and then adoption of a mutant baby. By bringing these issues of reproduction and environmental futures together, the film asks us to consider how our past and current choices help shape the future - both personal and planetary. The conclusion of the film serves in part to reinforce heteronormativity and reproductive futurism, both of which stake the future on the replication of the past through traditional relationships and by reproducing ourselves and our values through our children. Simultaneously, however, it gestures toward new possibilities for queer, nonhuman, mutant kinship and care.


2021 ◽  
Vol 31 (10) ◽  
pp. 1469-1489
Author(s):  
Xingran Cai ◽  
Zhongqin Li ◽  
Hui Zhang ◽  
Chunhai Xu

Author(s):  
Vaibhav Garg ◽  
Aditya Rajendra Kudekar ◽  
Praveen Kumar Thakur ◽  
Bhaskar R. Nikam ◽  
Shiv Prasad Aggarwal ◽  
...  

2021 ◽  
Author(s):  
Fabien Maussion ◽  
Quentin Lejeune ◽  
Ben Marzeion ◽  
Matthias Mengel ◽  
David Rounce ◽  
...  

&lt;p&gt;Mountain glaciers have a delayed response to climate change and are expected to continue to melt long after greenhouse gas emissions have stopped, with consequences both for sea-level rise and water resources. In this contribution, we use the Open Global Glacier Model (OGGM) to compute global glacier volume and runoff changes until the year 2300 under a suite of stylized greenhouse gas emission characterized by (i) the year at which anthropogenic emissions culminate, (ii) their reduction rates after peak emissions and (iii) whether they lead to a long-term global temperature stabilization or decline. We show that even under scenarios that achieve the Paris Agreement goal of holding global-mean temperature below 2&amp;#8201;&amp;#176;C, glacier contribution to sea-level rise will continue well beyond 2100. Because of this delayed response, the year of peak emissions (i.e. the timing of mitigation action) has a stronger influence on mit-term global glacier change than other emission scenario characteristics, while long-term change is dependent on all factors. We also discuss the impact of early climate mitigation on regional glacier change and the consequences for glacier runoff, both short-term (where some basins are expected to experience an increase of glacier runoff) and long-term (where all regions are expecting a net-zero or even negative glacier contribution to total runoff), underlining the importance of mountain glaciers for regional water availability at all timescales.&lt;/p&gt;


2021 ◽  
Author(s):  
Caroline Clason ◽  
Sally Rangecroft ◽  
Gina Kallis ◽  
Shaun Lewin ◽  
Tom Mullier ◽  
...  

&lt;p&gt;Glacier retreat provides clear, visual evidence of environmental change in response to warming temperatures around the world. In the tropical Andes of Peru, glaciers act as critical buffers to water supply essential to water, food, and energy security downstream, especially during the dry season. The direct and indirect impacts of glacier change are an important part of the global sustainability challenge within the context of both climate change and increased pressures on resources. Public understanding around glacier-fed water supplies, and subsequent threats to this for millions of people due to climate change, is an important component of climate literacy.&lt;/p&gt;&lt;p&gt;In this context, we have developed a web-based interdisciplinary citizen science glacier mapping tool (GlacierMap) to help to raise awareness of these issues, particularly amongst UK high school pupils, and to contribute to increased public support for mitigating and adapting to the impacts of climate change. Users of GlacierMap undertake an interactive learning experience by mapping a glacier from two different periods (1984 and 2018) from freely available Landsat data, resulting in a visual demonstration of glacier retreat within Peru&amp;#8217;s Cordillera Blanca, while learning more about the impacts of this retreat from information provided by the project.&amp;#160;&lt;/p&gt;&lt;p&gt;During the first four months of data collection we integrated pre- and post-mapping questionnaires into the GlacierMap app to evaluate the extent to which participation in mapping impacted understanding of glacier change and concern regarding the associated impacts. We also assessed the value of &amp;#8216;crowd-sourcing&amp;#8217; glacier mapping for the purposes of glacier monitoring and data generation through comparison of mapping conducted by the general public and that of a control group with previous education and/or work experience in glaciology. In doing so, we have identified a number of challenges and opportunities with regards to the use of a citizen science-based educational activity for climate learning. Challenges relate to recruitment of participants, evaluation, and ethics (particularly when working with children and young people), while opportunities were identified in terms of increasing public awareness, the provision of alternative forms of learning, and global reach. &amp;#160;&lt;/p&gt;


2021 ◽  
Author(s):  
Lilian Schuster ◽  
David Rounce ◽  
Fabien Maussion

&lt;p&gt;A recent large model intercomparison study (GlacierMIP) showed that differences between the glacier models is a dominant source of uncertainty for future glacier change projections, in particular in the first half of the century.&amp;#160; Each glacier model has their own unique set of process representations and climate forcing methodology, which makes it impossible to determine the model components that contribute most to the projection uncertainty. This study aims to improve our understanding of the sources of large scale glacier model uncertainty using the Open Global Glacier Model (OGGM), focussing on the surface mass balance (SMB) in a first step. We calibrate and run a set of interchangeable SMB model parameterizations (e.g. monthly vs. daily, constant vs. variable lapse rates, albedo, snowpack evolution and refreezing) under controlled boundary conditions. Based on ensemble approaches, we explore the influence of (i) the parameter calibration strategy and (ii) SMB model complexity on regional to global glacier change. These uncertainties are then put in relation to a qualitative selection of other model design choices, such as the forcing climate dataset and ice dynamics model parameters.&amp;#160;&lt;/p&gt;


Sign in / Sign up

Export Citation Format

Share Document