Atmospheric carbon dioxide is lower at the weekend.
Mauna Loa observatory: continuous atmospheric carbon dioxide measurements since the 1950s
The climate-monitoring station on Mauna Loa volcano on Hawaii, 3,400 metres above sea level, could hardly be farther away from it all. Yet even here there is no escaping the weekly rhythm of modern life. The observatory records lower concentrations of carbon dioxide in the atmosphere at the weekend than during the week.
Because there is no known natural cause of such a seven-day cycle, Randall Cerveny of Arizona State University and Kevin Coakley of the National Institute of Standards and Technology in Boulder, Colorado, propose that these observations reflect the weekday bustle and weekend lull in Hawaiis populated regions1.
The daily grind
Established in the 1950s, the Mauna Loa weather-monitoring station now takes continuous measurements of atmospheric carbon dioxide levels to help understand how human activities are changing global climate.
The Mauna Loa records show a steady rise in atmospheric carbon dioxide levels over the past few decades, modulated by an annual rise and fall owing to seasonal changes in the natural sources and sinks of the gas (caused by differences in plant growth, for instance). Cyclical changes on shorter time scales are harder to spot in the records, because they are usually much weaker than the seasonal oscillations, and masked by random variations in the data.
Cerveny and Coakley spotted the weekly cycle by calculating the average carbon dioxide levels for each day of the week, after subtracting out changes owing to the seasonal cycle and the gradual yearly rise. They find that the measurements rise to a peak on Mondays and then decline steadily to a minimum on Saturdays.
Crucially, the researchers find no such cycle in carbon dioxide records from the Amundsen-Scott South Pole Station in Antarctica, which is far from any sources of pollution. The Antarctic measurements show the same yearly trend and seasonal cycle, but there is no significant difference between average daily values.
The researchers reason that by the time carbon dioxide pollution reaches Antarctica, such short-term variations have evened out. On Hawaii, in contrast, local pollution levels seem to register almost instantly at the Mauna Loa station.
PHILIP BALL | © Nature News Service
"Airlift" facility: TU Freiberg tests new mining technology in research and training mine
22.10.2019 | Technische Universität Bergakademie Freiberg
Atmospheric pressure impacts greenhouse gas emissions from leaky oil and gas wells
21.10.2019 | University of British Columbia
Researchers have succeeded in creating an efficient quantum-mechanical light-matter interface using a microscopic cavity. Within this cavity, a single photon is emitted and absorbed up to 10 times by an artificial atom. This opens up new prospects for quantum technology, report physicists at the University of Basel and Ruhr-University Bochum in the journal Nature.
Quantum physics describes photons as light particles. Achieving an interaction between a single photon and a single atom is a huge challenge due to the tiny...
A very special kind of light is emitted by tungsten diselenide layers. The reason for this has been unclear. Now an explanation has been found at TU Wien (Vienna)
It is an exotic phenomenon that nobody was able to explain for years: when energy is supplied to a thin layer of the material tungsten diselenide, it begins to...
Researchers at Ludwig-Maximilians-Universitaet (LMU) in Munich have explored the initial consequences of the interaction of light with molecules on the surface of nanoscopic aerosols.
The nanocosmos is constantly in motion. All natural processes are ultimately determined by the interplay between radiation and matter. Light strikes particles...
Particles that are mere nanometers in size are at the forefront of scientific research today. They come in many different shapes: rods, spheres, cubes, vesicles, S-shaped worms and even donut-like rings. What makes them worthy of scientific study is that, being so tiny, they exhibit quantum mechanical properties not possible with larger objects.
Researchers at the Center for Nanoscale Materials (CNM), a U.S. Department of Energy (DOE) Office of Science User Facility located at DOE's Argonne National...
A new research project at the TH Mittelhessen focusses on the development of a novel light weight design concept for leisure boats and yachts. Professor Stephan Marzi from the THM Institute of Mechanics and Materials collaborates with Krake Catamarane, which is a shipyard located in Apolda, Thuringia.
The project is set up in an international cooperation with Professor Anders Biel from Karlstad University in Sweden and the Swedish company Lamera from...
02.10.2019 | Event News
02.10.2019 | Event News
19.09.2019 | Event News
22.10.2019 | Materials Sciences
22.10.2019 | Medical Engineering
22.10.2019 | Power and Electrical Engineering