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Ten new insights in climate science 2020 – a horizon scan
- Erik Pihl, Eva Alfredsson, Magnus Bengtsson, Kathryn J. Bowen, Vanesa Cástan Broto, Kuei Tien Chou, Helen Cleugh, Kristie Ebi, Clea M. Edwards, Eleanor Fisher, Pierre Friedlingstein, Alex Godoy-Faúndez, Mukesh Gupta, Alexandra R. Harrington, Katie Hayes, Bronwyn M. Hayward, Sophie R. Hebden, Thomas Hickmann, Gustaf Hugelius, Tatiana Ilyina, Robert B. Jackson, Trevor F. Keenan, Ria A. Lambino, Sebastian Leuzinger, Mikael Malmaeus, Robert I. McDonald, Celia McMichael, Clark A. Miller, Matteo Muratori, Nidhi Nagabhatla, Harini Nagendra, Cristian Passarello, Josep Penuelas, Julia Pongratz, Johan Rockström, Patricia Romero-Lankao, Joyashree Roy, Adam A. Scaife, Peter Schlosser, Edward Schuur, Michelle Scobie, Steven C. Sherwood, Giles B. Sioen, Jakob Skovgaard, Edgardo A. Sobenes Obregon, Sebastian Sonntag, Joachim H. Spangenberg, Otto Spijkers, Leena Srivastava, Detlef B. Stammer, Pedro H. C. Torres, Merritt R. Turetsky, Anna M. Ukkola, Detlef P. van Vuuren, Christina Voigt, Chadia Wannous, Mark D. Zelinka
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- Journal:
- Global Sustainability / Volume 4 / 2021
- Published online by Cambridge University Press:
- 27 January 2021, e5
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- Article
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Non-technical summary
We summarize some of the past year's most important findings within climate change-related research. New research has improved our understanding of Earth's sensitivity to carbon dioxide, finds that permafrost thaw could release more carbon emissions than expected and that the uptake of carbon in tropical ecosystems is weakening. Adverse impacts on human society include increasing water shortages and impacts on mental health. Options for solutions emerge from rethinking economic models, rights-based litigation, strengthened governance systems and a new social contract. The disruption caused by COVID-19 could be seized as an opportunity for positive change, directing economic stimulus towards sustainable investments.
Technical summaryA synthesis is made of ten fields within climate science where there have been significant advances since mid-2019, through an expert elicitation process with broad disciplinary scope. Findings include: (1) a better understanding of equilibrium climate sensitivity; (2) abrupt thaw as an accelerator of carbon release from permafrost; (3) changes to global and regional land carbon sinks; (4) impacts of climate change on water crises, including equity perspectives; (5) adverse effects on mental health from climate change; (6) immediate effects on climate of the COVID-19 pandemic and requirements for recovery packages to deliver on the Paris Agreement; (7) suggested long-term changes to governance and a social contract to address climate change, learning from the current pandemic, (8) updated positive cost–benefit ratio and new perspectives on the potential for green growth in the short- and long-term perspective; (9) urban electrification as a strategy to move towards low-carbon energy systems and (10) rights-based litigation as an increasingly important method to address climate change, with recent clarifications on the legal standing and representation of future generations.
Social media summaryStronger permafrost thaw, COVID-19 effects and growing mental health impacts among highlights of latest climate science.
Noise Power Spectrum of Copper Oxide Superconductors in the Normal State
- Joseph A. Testa, Yi Song, Xiao-Dong Chen, John P. Golben, Robert D. McMichael, Sung-Ik Lee, Bruce R. Patton, James R. Gaines
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- Journal:
- MRS Online Proceedings Library Archive / Volume 99 / 1987
- Published online by Cambridge University Press:
- 28 February 2011, 357
- Print publication:
- 1987
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The discovery of superconductivity above liquid nitrogen temperature in copper oxide compounds has resulted in much research activity aimed at understanding the nature of these materials, as well as at using them in practical devices from sensors to levitated trains. Despite this intense interest, there have been relatively few studies of fluctuation phenomena in them. One fluctuation-induced property of interest is the electrical noise power spectrum. Although excess noise above the thermal background in metals is usually observable only in thin films, we report here measurements of significant noise power in bulk composite samples of the nominal 90K superconductors Y1Ba2Cu3O7-δ (YBCO) and Er1Ba2Cu3O7-δ (EBCO) from 77K to 290K. The “excess” noise spectrum (the total spectrum minus the frequency-independent amplifier and thermal noise contributions) is 1/f in shape in the normal state; no 1/f noise is observed while superconducting. The excess noise magnitude is found to be too large to originate from the expected number of charge carriers, and to have an unusual temperature dependence. We discuss two possible explanations for these observations.