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Quantifying the Importance of Rapid Adjustments for Global Precipitation Changes
G Myhre1, R J Kramer2, C J Smith3
1CICERO Center for International Climate Research Oslo Norway.
Geophysical Research Letters
|February 19, 2019
Summary
Climate drivers impact precipitation through rapid adjustments. This study reveals similar fast precipitation responses to CO2 and black carbon increases, despite differing initial changes. Solar irradiance showed less model diversity in adjustments and precipitation.
Area of Science:
- Climate Science
- Atmospheric Physics
- Climate Modeling
Background:
- Different climate drivers affect precipitation uniquely.
- Rapid adjustments, triggered by atmospheric heating/cooling, are key to understanding these effects.
- Temperature, water vapor, and clouds are crucial for rapid precipitation adjustments.
Purpose of the Study:
- To analyze the influence of rapid adjustment processes on precipitation using radiative kernels.
- To investigate precipitation responses to five distinct climate drivers: CO2, CH4, solar irradiance, black carbon, and sulfate aerosols.
Main Methods:
- Utilizing radiative kernels to quantify the impact of rapid adjustments on precipitation.
- Comparing precipitation responses across various climate driver perturbations in climate models.
Main Results:
- Fast precipitation responses to doubled CO2 and a 10-fold increase in black carbon were similar.
- Despite differing radiative forcing and adjustments, CO2 and black carbon showed comparable precipitation changes.
- Solar irradiance perturbations exhibited lower model diversity in rapid adjustments and subsequent precipitation changes compared to other drivers.
Conclusions:
- Rapid adjustments significantly influence precipitation responses to climate drivers.
- The similarity in precipitation response between CO2 and black carbon highlights complex interactions.
- Solar irradiance offers a more consistent response across models, suggesting a more constrained adjustment pathway.
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