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62 notícias encontradas para "atmosphere"
Extreme droughts in the rainforest reduce important feedback between soil and atmosphere,
Isoprene is a volatile organic compound (VOC) that is produced naturally by plants. More than 500 megatonnes of isoprene are emitted each year into Earth's atmosphere, primarily from tropical forests. Soils are recognized sinks for atmospheric isoprene, but their behavior in natu
Grasslands could lose four times more carbon uptake under future drought conditions
The effects of individual climate factors on ecosystems are usually considered in isolation. However, in reality, they occur simultaneously and influence each other. Increasing CO2 concentrations in the atmosphere contribute to climate warming, which in turn fosters more frequent
Foto: Zelch Csaba / Pexels
Nautilus array to track missing exoplanet atmospheres
Exoplanet atmospheres have become prime targets for astrobiologists in the search for life beyond Earth. This is because exoplanet surfaces can't be directly imaged yet, so astronomers must get creative in how they search for signs of life, also called biosignatures. Presently, p
Foto: Marek Pavlík / Pexels
Cosmic dust could play key role in cracking long-standing mystery of solar corona heating
A researcher at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, has published a new study in The Astrophysical Journal suggesting that tiny charged dust grains near the sun may significantly influence how energy moves through the solar c
Weatherwatch: Cleaner clouds may slow rate of global heating
Study shows falling dust levels are making clouds more reflective, an effect not taken into account in climate modelsCleaner clouds are helping to slow the rate of global heating, a study shows. Falling levels of dust in the atmosphere are making clouds more reflective. This prev
Listen to Britain’s dawn chorus of 1976: the dramatic loss of birdsong in 50 years
Guardian recreates audio landscape of past filled by loud morning symphony before 73m wild birds were lostImagine a deafening abundance of birdsong so loud it wakes your children at dawn; the chirrup of house sparrows, the chattering of starlings, the melody of the wren, and the
Weatherwatch: How thunder is made
Sound of thunder varies depending on distance of listener from lightning as atmosphere muffles and absorbs sound A bolt of lightning heats the air almost instantly to as high as 30,000C, causing explosive expansion and a supersonic shock wave that becomes thunder. What that thund
Foto: K / Pexels
Volcanoes and wildfires are adding water vapor to the stratosphere, raising climate concer
Moderate volcanic eruptions and extreme wildfires since 2005 have led to an increase in the amount of water vapor in the stratosphere, a layer of Earth's atmosphere above the weather-filled troposphere. That's potentially bad news because water vapor here acts like a greenhouse g
Foto: Jean Gc / Pexels
Stress protection of Amazon trees, induced by climate warming, may alter atmosphere chemis
The Amazon rainforest is one of the largest carbon reservoirs on Earth. It is also the world's largest source of biogenic volatile organic compounds (VOCs). These carbon-based gases are naturally released by vegetation. They protect trees against various sources of stress, e.g.,
Tropical forests can switch from carbon sinks to carbon sources during El Niño
Tropical forests draw down and store large quantities of CO₂ from the atmosphere. The Amazon rainforest in South America, for example, stores approximately 123 billion tons of carbon—more than is stored in any other terrestrial ecosystem in the world. But these forests are facing
Low-altitude flights reveal Amazon methane emissions far above climate model estimates
Low-altitude flights reveal Amazon methane emissions far above climate model estimates
Methane (CH4) is a potent greenhouse gas whose concentration in the atmosphere has risen sharply in recent decades. Wetlands are the largest natural source of methane to the atmosphere, but large uncertainties remain about how much methane comes from wetlands and how these emissi
‘Unprecedented’ changes in UK climate are normalising extremes, report says
‘Unprecedented’ changes in UK climate are normalising extremes, report says
Annual State of the UK Climate analysis finds last four years in UK are in top five hottest on recordThe UK’s climatic extremes are becoming increasingly normal, a report has found, with last year the hottest on record and further “unprecedented changes” likely to break the recor