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The relationship between boundary layer stability and cloud cover in the post-cold frontal region
Catherine M Naud1, James F Booth2, Anthony D Del Genio3
1Applied Physics and Applied Mathematics, Columbia University/NASA-GISS, NY, NY.
Journal of Climate
|July 10, 2018
Summary
Low-level cloud cover shows a linear relationship with boundary layer stability in post-cold frontal conditions. This correlation between cloud cover and inversion strength holds across seasons and hemispheres, though other factors become more influential.
Area of Science:
- Atmospheric Science
- Meteorology
- Climate Science
Background:
- Boundary layer stability significantly influences cloud formation and properties.
- Post-cold frontal conditions represent a key meteorological regime for studying cloud-stability relationships.
Purpose of the Study:
- To investigate the relationship between low-level cloud cover and boundary layer stability in post-cold frontal environments.
- To assess the generality of a linear cloud cover-inversion strength relationship across different conditions and hemispheres.
Main Methods:
- Utilized NASA-Aqua MODIS and AIRS satellite data.
- Analyzed cloud top data below 700 hPa and stability measures like lower tropospheric stability (LTS) and estimated inversion strength (EIS).
- Employed cold front-centered composite analysis for global comparisons.
Main Results:
- A linear relationship was observed between seasonal cloud cover and inversion strength (EIS) in quiescent and weakly subsiding conditions.
- This relationship persisted in dynamically active and subsiding post-cold frontal conditions.
- A good correlation between cloud cover and EIS was found across hemispheres and seasons, though it degraded in specific regions, indicating the influence of other large-scale factors.
Conclusions:
- The linear relationship between cloud cover and inversion strength is robust in post-cold frontal conditions.
- While stability is a key driver, other large-scale atmospheric factors modulate cloud cover at regional scales.
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