English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this study, we examine the driving mechanism for the atmosphericoverturning circulation on dry, tidally-locked rocky planets without thecondensation of water vapor or other species. We find that the main drivingprocess is the radiative cooling of CO2 (or other non-condensable greenhousegases) rather than CO2 greenhouse warming or stellar radiation. Stellarradiation is the ultimate mechanism but not the direct mechanism. Due to thecombination of the uneven distribution in the stellar radiation and effectivehorizontal energy transports in the free troposphere, there is strongtemperature inversion in the area away from the substellar region. Thisinversion makes CO2 to have a radiative cooling effect rather than a radiativewarming effect for the atmosphere, same as that in the stratosphere of Earth'satmosphere. This cooling effect produces negative buoyancy and driveslarge-scale downwelling, supporting the formation of a global-scale overturningcirculation. If CO2 is excluded from the atmosphere, the overturningcirculation becomes very weak, regardless the level of stellar radiation. Thismechanism is completely different from that for the atmospheric overturningcirculation on Earth or on moist, tidally-locked rocky planets, where latentheat release and/or baroclinic instability are the dominated mechanisms. Ourstudy improves the understanding of the atmospheric circulation ontidally-locked exoplanets and also on other dry planets, such as Venus and Marsin the solar system.

Atmospheric Overturning Circulation on Dry, Tidally-locked Rocky Planets is Mainly Driven by Radiative Cooling