Friday 31 January 2025
The study of sudden stratospheric warmings (SSWs) has long fascinated scientists, as these events can have a significant impact on our planet’s atmosphere and climate. A recent analysis published in Atmospheric Chemistry and Physics explores the relationship between SSWs and changes in carbon dioxide concentrations in the mesosphere and lower thermosphere.
The mesosphere is a region of the atmosphere that extends from about 50 to 85 kilometers above the Earth’s surface. It’s here that carbon dioxide plays a crucial role in regulating the temperature, as it absorbs infrared radiation and helps to cool the atmosphere. However, during SSWs, this delicate balance is disrupted, leading to changes in the distribution of carbon dioxide.
Scientists have long known that SSWs are associated with an increase in atmospheric circulation patterns, which can lead to changes in the transport of gases like carbon dioxide. But until now, it was unclear how these changes affected the concentration of CO2 in the mesosphere and lower thermosphere.
Using a combination of observations from the TIMED/SABER instrument and simulations from the Whole Atmosphere Community Climate Model with Thermosphere and Ionosphere Extension (WACCM-X), researchers were able to study the impact of SSWs on carbon dioxide concentrations. They found that during an SSW, the concentration of CO2 in the mesosphere increases by up to 10%, while in the lower thermosphere it decreases by as much as 15%.
These changes have significant implications for our understanding of the Earth’s atmosphere and climate. For example, increased CO2 concentrations in the mesosphere can lead to a cooling effect on the upper atmosphere, which could potentially influence the formation of polar vortices.
The study also highlights the importance of considering the interactions between different layers of the atmosphere when studying SSWs. By taking into account the complex dynamics at play, researchers can gain a better understanding of how these events impact our planet’s climate and atmospheric circulation patterns.
In addition to shedding light on the relationship between SSWs and carbon dioxide concentrations, this study demonstrates the value of combining observations with simulations in understanding atmospheric phenomena. By merging data from space-based instruments like TIMED/SABER with model outputs from WACCM-X, scientists can gain a more comprehensive view of the complex processes that shape our atmosphere.
Overall, this research provides new insights into the intricate relationships between sudden stratospheric warmings, carbon dioxide concentrations, and atmospheric circulation patterns.
Cite this article: “Sudden Stratospheric Warmings Impact Carbon Dioxide Concentrations in the Mesosphere and Lower Thermosphere”, The Science Archive, 2025.
Atmosphere, Climate, Carbon Dioxide, Sudden Stratospheric Warmings, Ssws, Mesosphere, Lower Thermosphere, Atmospheric Circulation, Timed/Saber, Waccm-X
