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Does temperature nudging overwhelm aerosol radiative effects in regional integrated climate models?
Jian He1, Timothy Glotfelty1, Khairunnisa Yahya2
1Systems Exposure Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.
Atmospheric Environment (Oxford, England : 1994)
|August 28, 2018
Summary
Nudging in air quality models can alter temperatures, competing with aerosol effects. Pseudo radiative effects from nudging are smaller than aerosol radiative effects in the atmosphere but can be larger locally at the surface.
Area of Science:
- Atmospheric Science
- Air Quality Modeling
- Climate Science
Background:
- Nudging (data assimilation) is crucial for reducing biases in regional integrated meteorology-air quality models.
- Temperature changes from nudging can interfere with aerosol radiative effects, posing modeling challenges.
- Understanding these competing effects is vital for accurate climate and air quality simulations.
Purpose of the Study:
- To quantify and compare the pseudo radiative effects (PRE) of nudging with aerosol radiative effects (ARE).
- To investigate the scale-dependent differences between nudging-induced and aerosol-induced temperature changes.
- To assess the implications of these interactions for regional and local air quality modeling.
Main Methods:
- Converting temperature changes from nudging into pseudo radiative effects (PRE) at surface (PRE_sfc), troposphere (PRE_atm), and top of atmosphere (PRE_toa).
- Comparing calculated PRE values with reported aerosol radiative effects (ARE).
- Analyzing the spatial distribution of PRE at regional and local scales.
Main Results:
- Domain-averaged PRE_sfc is generally smaller than ARE_sfc, but can exceed ARE_sfc at local scales.
- PRE_atm is significantly smaller than ARE_atm across the domain.
- Nudging's influence on temperature varies considerably between surface and free atmosphere levels.
Conclusions:
- Nudging methodology can be cautiously applied for studying aerosol radiative effects at continental/regional scales.
- Local-scale applications of nudging require careful consideration due to potentially dominant pseudo radiative effects.
- Distinguishing between nudging and aerosol impacts is critical for accurate integrated modeling.
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