Since 2005, our Earth seems to have a tendency to trap more and more heat. So much so that the imbalance between the heat received from the Sun and the heat emitted into space is qualified by researchers today as “unprecedented.” Cause it warmed up faster than they imagined.
If it’s (still) too good to be on us, it is the result of a subtle balance. enter here that our planet receives . And the one that emits towards space. To qualify the difference between the two, between the amount of absorbed in radiation and the amount of radiation on the earth’s surface The thermal emitted towards space, the researchers speak of the radiation balance. and they consider this to be much more important than ordinary surface temperature, intended to judge the extent of .
Earth’s climate depends on a delicate balance between energy coming from the Sun – mostly in the form of light – and radiating back into space as heat. As human emissions of greenhouse gases trap more heat in Earth’s atmosphere, that balance is shifting. pic.twitter.com/jJcYNFqJgd
— NASA Earth (@NASAEarth) 15 June 2021
Historically, itVery little positive. Till now ( Today let us tell you that between 2005 and 2019, the imbalance of the Earth’s radiation balance doubled. it remains low – about 0.3% – but “The magnitude of the increase is unprecedented”, emphasizes study lead author Norman Loeb, a .
To reach these conclusions, the researchers worked on independent datasets. ofCeres program satellites – for clouds and earth power system – which on the one hand measure the energy entering and leaving the Earth system. Argo’s global network of ocean floats that provide accurate by which On the other hand. It absorbs 90% of the excess heat, its temperature really seems to be an indicator of choice. And all this data is consistent.
anthropogenic and natural causes
The main factors causing this imbalance in the Earth’s radiation balance remain to be determined. After investigation, researchers believe this is partly the result of increased concentrations in the atmosphere.due to human activities. What they call anthropogenic forcing. But this imbalance will also be caused by warming and other effects of natural climate change.
It is now known that greenhouse gases trap heat in the atmosphere. Hence his name, in addition. how? ‘ or ‘ what? By capturing outgoing radiation that would escape into space without them. The resulting warming leads to an increase in water vapor in the atmosphere. However, it also traps part of the outgoing radiation. decline ofand sea ice are the cause of more and more solar energy.
The second phenomenon that the researchers point to is the transition of the Pacific Decadal Oscillation (PDO) from a cold phase to a warm phase. Because this natural variability of the Earth system can have a great impact on climate. Between 2014 and 2020, a hot phase of the PDO caused aOver the ocean and hence the absorption of solar radiation increased.
While it is difficult to predict what Earth’s radiation balance will look like in the coming decades, the work presented here suggests that changes are to be expected until the rate of heat absorption decreases. more important than the changes already taking place.