̽��ֱ�� of Cambridge - Open ̽��ֱ��

Liquid water beneath Martian polar ice cap

sc604 — Thu, 29 Sep 2022 14:38:08 +0000

An international team of researchers has revealed new evidence for the possible existence of liquid water beneath the south polar ice cap of Mars.

Microscopic view on asteroid collisions could help us understand planet formation

cmm201 — Thu, 24 Feb 2022 10:00:43 +0000

A team of researchers, led by the ̽��ֱ�� of Cambridge, combined dating and microscopic analysis of the Chelyabinsk meteorite — which fell to Earth and hit the headlines in 2013 — to get more accurate constraints on the timing of ancient impact events.

Their study, published in Communications Earth & Environment, looked at how minerals within the meteorite were damaged by different impacts over time, meaning they could identify the biggest and oldest events that may have been involved in planetary formation.

“Meteorite impact ages are often controversial: our work shows that we need to draw on multiple lines of evidence to be more certain about impact histories – almost like investigating an ancient crime scene,” said Craig Walton, who led the research and is based at Cambridge’s Department of Earth Sciences.

Early in our Solar System’s history, planets including the Earth formed from massive collisions between asteroids and even bigger bodies, called proto-planets.

“Evidence of these impacts is so old that it has been lost on the planets — Earth, in particular, has a short memory because surface rocks are continually recycled by plate tectonics,” said co-author Dr Oli Shorttle, who is based jointly at Cambridge’s Department of Earth Sciences and Institute of Astronomy.

Asteroids, and their fragments that fall to Earth as meteorites, are in contrast inert, cold and much older— making them faithful timekeepers of collisions.

̽��ֱ��new research, which was a collaboration with researchers from the Chinese Academy of Sciences and the Open ̽��ֱ��, recorded how phosphate minerals inside the Chelyabinsk meteorite were shattered to varying degrees in order to piece together a collision history.

Their aim was to corroborate uranium-lead dating of the meteorite, which looks at the time elapsed for one isotope to decay to another.

“ ̽��ֱ��phosphates in most primitive meteorites are fantastic targets for dating the shock events experienced by the meteorites on their parent bodies,” said Dr Sen Hu, who carried out the uranium-lead dating at Beijing’s Institute of Geology and Geophysics, Chinese Academy of Sciences.

Previous dating of this meteorite has revealed two impact ages, one older, roughly 4.5-billion-year-old collision and another which occurred within the last 50 million years.

But these ages aren’t so clear-cut. Much like a painting fading over time, successive collisions can obscure a once clear picture, leading to uncertainty among the scientific community over the age and even the number of impacts recorded.

̽��ֱ��new study put the collisions recorded by the Chelyabinsk meteorite in time order by linking new uranium-lead ages on the meteorite to microscopic evidence for collision-induced heating seen inside their crystal structures. These microscopic clues build up in the minerals with each successive impact, meaning the collisions can be distinguished, put in time order and dated.

Their findings show that minerals containing the imprint of the oldest collision were either shattered into many smaller crystals at high temperatures or strongly deformed at high pressures.

̽��ֱ��team also described some mineral grains in the meteorite that were fractured by a lesser impact, at lower pressures and temperatures, and which record a much more recent age of less than 50 million years. They suggest this impact probably chipped the Chelyabinsk meteorite off its host asteroid and sent it hurtling to Earth.

Taken together, this supports a two-stage collision history. “ ̽��ֱ��question for us was whether these dates could be trusted, could we tie these impacts to evidence of superheating from an impact?” said Walton. “What we’ve shown is that the mineralogical context for dating is really important.”

Scientists are particularly interested in the date of the 4.5-billion-year-old impact because this is about the time we think the Earth-Moon system came to being, probably as a result of two planetary bodies colliding.

̽��ֱ��Chelyabinsk meteorite belongs to a group of so-called stony meteorites, all of which contain highly shattered and remelted material roughly coincident with this colossal impact.

̽��ֱ��newly acquired dates support previous suggestions that many asteroids experienced high energy collisions between 4.48 – 4.44 billion years ago. “ ̽��ֱ��fact that all of these asteroids record intense melting at this time might indicate Solar System re-organisation, either resulting from the Earth-Moon formation or perhaps the orbital movements of giant planets.”

Walton now plans to refine dating over the window of the Moon-forming impact, which could tell us how our own planet came to being.

Reference:
Walton, C.R. et al. ‘Ancient and recent collisions revealed by phosphate minerals in the Chelyabinsk meteorite.’ Communications Earth & Environment (2022). DOI: 10.1038/s43247-022-00373-1

A new way of dating collisions between asteroids and planetary bodies throughout our Solar System’s history could help scientists reconstruct how and when planets were born.

Our work shows that we need to draw on multiple lines of evidence to be more certain about impact histories – almost like investigating an ancient crime scene

Craig Walton

False-colour image of impact recrystallised phosphate mineral in Chelyabinsk meteorite

̽��ֱ��text in this work is licensed under a Creative Commons Attribution 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – as here, on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

Yes

Funding announced for almost 400 new doctoral places in arts and humanities

sjr81 — Wed, 15 Aug 2018 10:45:43 +0000

̽��ֱ��Open-Oxford-Cambridge AHRC DTP is a consortium of the three universities for doctoral training and funding in the Humanities. ̽��ֱ��DTP is underpinned by world-class research and training environments, supported by strategic partnerships with the BBC World Service, the National Trust and British Telecom, and is national and international in mindset, and determined to take a leading role in shaping the future of doctoral training in the UK.

̽��ֱ��AHRC is the UK’s largest funder of postgraduate training in the arts and humanities, and plays an essential role in supporting the next generation of highly capable researchers. By working together, the AHRC, the Open ̽��ֱ��, and the Universities of Oxford and Cambridge are able to commit to investing in this partnership over its lifetime.

Professor David Rechter, incoming Director of the Open-Oxford-Cambridge AHRC DTP, said: “I am pleased by the success of our bid, and look forward to recruiting our first cohort of students next year. Supported by our partners the National Trust, the BBC World Service and British Telecom, the Open-Oxford-Cambridge DTP will offer students a wealth of opportunities to pursue research and engage in training, and to learn from each other as part of a large multi-disciplinary group. These opportunities will equip our DTP students with the research expertise and skills that will allow them to go on to wide range of careers in academia and beyond.”

Professor Martin Millett, Head of the School of Arts and Humanities at Cambridge, said: “ ̽��ֱ��success of this bid is excellent news. ̽��ֱ��unique collaboration between Oxford, Cambridge and the Open ̽��ֱ�� opens up exciting new prospects for the next generation of doctoral research students in the Arts and Humanities.”

Professor Edward Harcourt, the AHRC’s Director of Research, Strategy and Innovation, said: “ ̽��ֱ��AHRC is delighted to announce its renewed commitment to the Doctoral Training Partnerships model. Our support for the next generation of arts and humanities researchers is critical to securing the future of the UK arts and humanities sector, which accounts for nearly a third of all UK academic staff, is renowned the world over for its outstanding quality, and which plays a vital part in our higher education ecosystem as a whole.

“We were extremely pleased with the response to our call, which saw high-quality applications from across the UK from a variety of diverse and innovative consortia, each with a clear strategy and vision for the future support of their doctoral students.”

Professor Kevin Hetherington, Pro-Vice-Chancellor (Research and Academic Strategy), ̽��ֱ��Open ̽��ֱ��, said: “ ̽��ֱ��Open ̽��ֱ�� is delighted that the AHRC has chosen to recognise the commitment to innovation and diversity inherent in the Open-Oxford-Cambridge DTP, and looks forward to participating fully in the delivery of an exciting training programme for our PhD students.”

Professor Karen O’Brien, Head of the Humanities Division, ̽��ֱ�� of Oxford, said: “This is good news and an endorsement of our collective commitment to developing the next generation of Humanities scholars. We are looking forward to working with the Open ̽��ֱ��, Cambridge, the AHRC and our strategic partners to deliver a truly exciting opportunity to our consortium students.”

Stephen Cassidy, Chief Researcher, System Science, BT Labs, said: “As a communication company deeply rooted in the interaction between people, communities and businesses, BT sees great benefit in being part of this DTP. Interaction with the students and academics will extend our understanding of ethical, legal and social ramifications of the possible directions the industry as a whole could (and is) embarking on. These are issues of international scale, and we are pleased to link with the DTP and to provide further links with our research collaborations around the UK and the globe.”

Jamie Angus, Director, BBC World Service Group, said: “ ̽��ֱ��objectives of the Consortium and the Doctoral Training partnership fit very well with the BBC World Service’s objectives; ̽��ֱ��BBC World Service Group provides independent impartial journalism to nearly 350 million people around the world each week, across cultural, linguistic and national boundaries. We look forward to working with world-class doctoral students in the Humanities drawing on their research skills and subject expertise, as well as making the most of the huge range of languages studied at Oxford, Cambridge and the OU. Working together we will play our part so that the Consortium can provide DTP-funded students with skills and experience they need to communicate their ideas beyond academia so that they may be better able to reach a wider audience.”

Nino Strachey, Head of Research and Specialist Advice at the National Trust, said: “ ̽��ֱ��National Trust is delighted at the success of the bid and excited to work with students and staff from these internationally recognised universities and partners. With a long history of hosting and co-supervising PhDs, we look forward to offering opportunities for students to gain experience of the heritage sector and to work with Europe’s largest conservation charity.”

Information on how to apply for scholarships via the Open-Oxford-Cambridge AHRC Doctoral Training Partnership for entry in 2019/20 will be available from www.oocdtp.ac.uk from 1 September 2018.

̽��ֱ��Open ̽��ֱ��, the ̽��ֱ�� of Oxford and the ̽��ֱ�� of Cambridge are pleased to announce the success of their bid for funding for the Open-Oxford-Cambridge Arts and Humanities Research Council Doctoral Training Partnership, which will create nearly 400 new doctoral places in the arts and humanities.

̽��ֱ��unique collaboration between Oxford, Cambridge and the Open ̽��ֱ�� opens up exciting new prospects for the next generation of doctoral research students in the Arts and Humanities

Martin Millett

Sir Cam

Faculty of English on the ̽��ֱ��'s Sidgwick Site, home to many of the faculties and departments from the School of Arts and Humanities.

Yes

Licence type:

Attribution-Noncommercial-ShareAlike

What impact will new technology have on tackling emissions?

sj387 — Mon, 21 Oct 2013 09:14:01 +0000

Computational models provide unparalleled insight into current and future demand for water, land and energy, and the impact these demands have on greenhouse gas (GHG) emissions and the environment. What if we could also take into account the fast pace at which new technologies are evolving? This is the aim of a new project in the Cambridge Centre for Climate Change Mitigation Research (4CMR) in the ̽��ֱ�� of Cambridge’s Department of Land Economy.

Dr Jean-Francois Mercure, who leads the research, asserts that building this factor into models will help understanding of the degree to which improvements in energy-consuming technologies and their adoption can help governments reduce emissions: “Technology comes to life through innovation, timely investments and policy incentives, and so it’s important to include technology diffusion and its pace in energy modelling.

“However, this is challenging and most models today attempt to calculate cost-optimal technology roadmaps based on current technology, which is not necessarily likely to happen, and which disregard the process by which new technology regimes come to existence, but also how old technologies endure.”

Technological change occurs constantly, either following innovations in industrial systems or through evolutions of behaviours, such as in the adoption of electric cars. Earlier this year, with funding from the Engineering and Physical Sciences Research Council, Mercure began work on a computational modelling system that takes into account the profile of technology transitions in the past to project how new transitions could arise in the future.

To do so, he is collaborating with environmental scientists at the Tyndall Centre at the ̽��ֱ�� of East Anglia and at the Open ̽��ֱ��, policy advisors and researchers at the UK Department for Energy and Climate Change and the Committee for Climate Change, and applied economists at Cambridge Econometrics.

Mercure believes that this will be the first time an energy–economy–environment model at the global level simultaneously considers technology diffusion in all sectors of energy use alongside natural resource constraints and the interaction between sectors.

“If the global power sector is to decarbonise by 2050 without there being significant economic costs then all countries must make a contribution to the development of renewable technologies,” he added.

“Take as an example the solar photovoltaic industry. Large investments in Germany enabled production costs of firms in China to decline significantly in recent years, which could not have occurred without such investments. Technology sectors typically face a classic vicious circle: established technologies thrive because they are established, and emerging technologies see barriers to their diffusion due to the lock-in of established technologies. This will be the case unless an emerging technology is a radical improvement over established technologies, or it benefits from strong policy support and investment. This applies to many other sectors such as mobility technologies, industry and household appliances.”

Professor Douglas Crawford-Brown, Director of 4CMR, is excited by the prospects of this new modelling: “Dr Mercure’s work sits nicely at the intersection of aggregated economic sectors and the decisions of individual investors. He is plotting an intermediate ground in which both theories of investor behaviour and empirical econometrics allow for much greater insights into energy supply and demand.”

Mercure’s recent research has focused on the global electricity sector, which currently emits 38% of global fuel combustion emissions mostly through the use of fossil fuels. ̽��ֱ��new project will extend the model to all major energy-consuming sectors, including transport, industry (e.g. steel, cement) and buildings (heating, appliances), to model different scenarios of support policies for technological change.

“We want to be able to answer questions about the impact of policy changes on global emissions. Badly coordinated roadmaps of technological change can lead to increases in GHG emissions and so it’s important to know which types of policies will incentivise efficient emissions reductions in order to avoid dangerous climate change.”

New research seeks to take account of the fast pace at which technology is evolving in understanding how to tackle greenhouse gas emissions.

Technology comes to life through innovation, timely investments and policy incentives

Jean-Francois Mercure

Paul Krueger

Car2Go Electric Car Sharing

This work is licensed under a Creative Commons Licence. If you use this content on your site please link back to this page.

Yes