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Natural short-lived halogens exert an indirect cooling effect on climate

Observational evidence shows the ubiquitous presence of ocean-emitted short-lived halogens in the global atmosphere1–3. Natural emissions of these chemical compounds have been anthropogenically amplified since pre-industrial times4–6, while, in addition, anthropogenic short-lived halocarbons are currently being emitted to the atmosphere7,8. Despite their widespread distribution in the atmosphere, the combined impact of these species on Earth’s radiative balance remains unknown. Here we show that short-lived halogens exert a substantial indirect cooling effect at present (−0.13 ± 0.03 watts per square metre) that arises from halogen-mediated radiative perturbations of ozone (−0.24 ± 0.02 watts per square metre), compensated by those from methane (+0.09 ± 0.01 watts per square metre), aerosols (+0.03 ± 0.01 watts per square metre) and stratospheric water vapour (+0.01 ....

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"Improving our knowledge of volatile organic compounds over south-east " by Jhonathan Ramirez Gamboa

The work presented in this thesis aims to improve our understanding of biogenic and anthropogenic volatile organic compounds (VOCs) over south-east Australia, while evaluating and identifying factors influencing model simulation results in the region. Specifically, this thesis presents three studies.
The first study was aimed at investigating the uncertainties in model simulation results by comparing between the chemical transport models GEOS-Chem and CSIRO-CTM using biogenic VOC emissions from emissions model MEGAN. Five scenarios with different model/emission schemes were compared to understand which factors were driving significant differences in the simulated mole fractions and subsequent chemistry involving VOCs in the atmosphere. Both models have a relatively good performance reproducing measured temporal variation but failed to accurately simulate the magnitude of biogenic VOC mole fractions. Meteorology fields were one of the factors influencing these discrepancies. Both emi ....

South East Australia , New Particle Formation ,

The Arctic Has a Cloud Problem

The Atlantic
Tiny iodine particles are clumping together to trap sunlight and melt polar sea ice.
Christian Vorhofer/ imageBROKER / Alamy
To climate scientists, clouds are powerful, pillowy paradoxes. They can reflect away the sun’s heat but also trap it in the atmosphere; they can be products of warming temperatures but can also amplify their effects. Now, while studying the atmospheric chemistry that produces clouds, researchers have uncovered an unexpectedly potent natural process that seeds their growth. And as the Earth continues to warm from rising levels of greenhouse gases, this process could be a major new mechanism for accelerating the loss of sea ice at the poles one that no global climate model currently incorporates. ....

Intergovernmental Panel On Climate Change , Intergovernmental Panel On Climate , Fifth Assessment Report , Intergovernmental Panel , Climate Change , Climate Scientists , Studies Of Aerosols , Tiny Particles , Global Climate Model , Cloud Chamber , Atmospheric Chemistry , Senior Scientist , Loss Of Sea Ice , Climate Models , Urban Areas , Atmospheric Research , Potent Natural Process , Jasper Kirkby , Andrew Gettelman , Sulfuric Acid , Water Vapor , Major New Mechanism , Arctic Region , Degrees Celsius , Full Climate Impact Of This Mechanism , Ipccs Average Upper Bound ,

Study Shows How Air Pollution Affects Human Health and Climate

Study Shows How Air Pollution Affects Human Health and Climate
Written by AZoCleantechFeb 24 2021
For the first time, scientists from the University of Helsinki have resolved how the ultrafine particles in the air have an impact on health and the climate.
Researchers followed the growth and chemical composition of the freshly formed particles until those reached sizes where they contribute to mass accumulation. Image Credit: Lubna Dada.
Every day, more than 10,000 people die from atmospheric air pollution. The mass buildup of atmospheric particles, measuring less than 2.5 µm in diameter, is believed to be the biggest hazard to human health, that is, if the mass and loss of visibility are higher, the threat will be bigger. ....

Eteläuomen Läi , Lubna Dada , Markku Kulmala , University Of Helsinki , Institute For Atmospheric , Earth System Research , Academician Markku Kulmala , Faraday Discussion , Mass Relevant , New Particle Formation , Earth System , லுப்னா அப்பா , பல்கலைக்கழகம் ஆஃப் ஹெல்சின்கி , நிறுவனம் க்கு வளிமண்டலம் , பூமி அமைப்பு ஆராய்ச்சி , ஃபாரடே கலந்துரையாடல் , நிறை தொடர்புடையது , புதியது துகள் உருவாக்கம் , பூமி அமைப்பு ,

Study shows how ultrafine particles of atmosphere have impact on climate, health

Study shows how ultrafine particles of atmosphere have impact on climate, health
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Eteläuomen Läi , Lubna Dada , Markku Kulmala , Emily Henderson , University Of Helsinki , Institute For Atmospheric , Earth System Research , Researchers Of The University Helsinki , Earth System , Faraday Discussion , New Particle Formation , லுப்னா அப்பா , எமிலி ஹென்டர்சன் , பல்கலைக்கழகம் ஆஃப் ஹெல்சின்கி , நிறுவனம் க்கு வளிமண்டலம் , பூமி அமைப்பு ஆராய்ச்சி , ஆராய்ச்சியாளர்கள் ஆஃப் தி பல்கலைக்கழகம் ஹெல்சின்கி , பூமி அமைப்பு , ஃபாரடே கலந்துரையாடல் , புதியது துகள் உருவாக்கம் ,