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Updated: Dec 13, 2025
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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Relationships Between Precipitation Properties and Large-Scale Conditions During Subsidence at the Eastern North
Katia Lamer1,2, Catherine M Naud3, James F Booth1,4
1Earth and Atmospheric Sciences The City University of New York City College New York NY USA.
Journal of Geophysical Research. Atmospheres : JGR
|July 28, 2020
Summary
Cold fronts enhance precipitation from boundary layer clouds, with cloud properties more influential than large-scale conditions. Understanding these links improves climate model precipitation simulations.
Area of Science:
- Atmospheric Science
- Meteorology
- Climate Science
Background:
- Boundary layer clouds significantly influence Earth's radiative balance.
- Precipitation processes in these clouds are complex and not fully understood.
- Accurate representation of precipitation is crucial for climate modeling.
Purpose of the Study:
- To analyze rain and boundary layer cloud properties at the Eastern North Atlantic (ENA) observatory.
- To investigate the relationship between cloud properties, precipitation, and the large-scale environment.
- To improve parameterizations for precipitation in climate models.
Main Methods:
- Analysis of three years of reanalysis and ground-based observations from the ENA.
- Comparison of cloud and rain properties during general subsidence and post-cold front conditions.
- Investigation of relationships between precipitation, cloud macrophysics, and large-scale environmental parameters.
Main Results:
- Clouds following cold fronts showed a 10% higher precipitation propensity and rain-to-cloud fraction.
- Monotonic relationships were found between precipitation properties and surface forcing/boundary layer stability.
- Cloud macrophysics demonstrated a more direct impact on rain properties than the large-scale environment.
Conclusions:
- Large-scale conditions, particularly those following cold fronts, influence precipitation characteristics.
- Cloud macrophysics play a dominant role in determining rain properties.
- Accurate modeling of both clouds and the large-scale environment is essential for realistic precipitation simulation.
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