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Constraining effects of aerosol-cloud interaction by accounting for coupling between cloud and land surface
Tianning Su1, Zhanqing Li1, Natalia Roldan Henao1
1Earth System Science Interdisciplinary Center & AOSC, University of Maryland, College Park, MD, USA.
Science Advances
|May 23, 2024
Summary
Aerosol-cloud interactions (ACIs) are crucial for climate regulation but are poorly understood. This study reveals cloud-surface coupling significantly alters aerosol effects on clouds, impacting climate forcing estimates.
Area of Science:
- Atmospheric Science
- Climate Science
- Earth System Science
Background:
- Aerosol-cloud interactions (ACIs) are critical climate regulators, influencing Earth's energy and water cycles.
- Significant uncertainties exist in ACIs, leading to discrepancies between observations and climate models.
- Conventional measurement techniques often fail to capture aerosols at cloud level, introducing bias.
Purpose of the Study:
- To quantify a major bias in ACI radiative forcing estimates.
- To introduce an advanced approach for determining ACI radiative forcing by accounting for cloud-surface coupling.
- To investigate the impact of cloud-surface coupling on aerosol vertical transport and ACI effects.
Main Methods:
- Integration of field observations, satellite data, and model simulations.
- Development of an advanced approach to account for cloud-surface coupling in ACI analysis.
- Comparison of ACI effects in coupled versus decoupled cloud regimes.
Main Results:
- Cloud-surface coupling drastically alters aerosol vertical transport and ACI effects.
- In coupled regimes, aerosols more homogeneously influence cloud droplet number concentration.
- Decoupled conditions show aerosols from the free atmosphere predominantly affecting cloud properties, causing cooling.
Conclusions:
- Cloud-surface coupling is a key, often overlooked, factor in accurately quantifying ACIs.
- Traditional ACI estimates may significantly underassess the true climate forcing effects.
- Accurate ACI quantification requires consideration of the relationship between clouds and the surface.
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