The study, by climate scientists Xuebin Zhang and Francis Zwiers of Environment Canada, and Peter Stott of the UK Meteorological Office, is published in the September issue of the American Meteorological Society's Journal of Climate.
In the study, the scientists used four climate models – two developed by Environment Canada, and two developed by the UK Met Office.
The three regions in the study have experienced rising temperatures during the 20th century. The scientists analyzed temperature measurements from 1900 to 1999, to determine the geographic patterns and timing of this warming, as it changed from decade to decade. The researchers then used computer-based climate models developed at the Canadian Centre for Climate Modeling and Analysis and the Hadley Centre for Climate Prediction and Research to simulate the climates over the same time periods.
They found that simulations which include human influences on climate were able to reproduce the patterns and evolution of the observed temperature changes. This indicates that the models can simulate climate change, even at a scale as small as that of a large country, and that natural variability of the climate system alone can not explain the observed warming.
In Canada, south of 70° N. latitude, human-induced climate change was detected most clearly in the period from 1950 to 1999. Canada has warmed by about 1° C. over the past 100 years. The temperature rise from 1950 to 1999 was more pronounced than in the first half of the 20th century.
Over the past 10 years, climate scientists have been making steady progress in finding evidence of human-induced climate change. The challenge is to separate the natural fluctuations in climate from those that are caused by human activities. On a global scale, it is easier to detect such small changes in climate, as the natural fluctuations tend to average out for a large area. Scientists are now able to identify the human fingerprint on smaller areas, even at the scale of a single large country. Researchers attribute this progress to improvements in computer models, faster supercomputer capability, a growing record of historical climate information, and the fact that climate change is now becoming more pronounced.
This research also gives the scientists increased confidence in their ability to predict future climate change. By using computer models to simulate climate change that has already occurred, the researchers have demonstrated the accuracy of the model projections.
Stephanie Kenitzer | EurekAlert!
Successful calculation of human and natural influence on cloud formation
04.11.2016 | Goethe-Universität Frankfurt am Main
Invasive Insects Cost the World Billions Per Year
04.10.2016 | University of Adelaide
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine