Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31b1730r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA31B-1730
Physics
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [3334] Atmospheric Processes / Middle Atmosphere Dynamics
Scientific paper
One of the mysteries of the Sun-Earth system is the response of the atmosphere when precipitating particle energy is redistributed via dynamical, chemical, and radiative processes. Elucidating the coupling intrinsic to this response is a prerequisite for understanding and predicting variability in and across many atmospheric regions. This work focuses on the energetic particle precipitation (EPP) indirect effect (IE), by which odd nitrogen produced by EPP in the upper atmosphere descends to the stratosphere, perturbing ozone chemistry and thus the radiative balance of the middle atmosphere. We will summarize the observational evidence for the EPP IE in the last few decades. The EPP IE occurs nearly every year in both hemispheres, and is modulated by variability in both the EPP and atmospheric meteorology. We will discuss the advantages and disadvantages of various measurement techniques for investigating the EPP IE, along with uncertainties in the analysis methods. Attributing observed variations in the lower atmosphere to the EPP IE is difficult because of other factors that influence the atmosphere on similar time and spatial scales. Thus we will present model results from the Whole Atmosphere Community Climate Model (WACCM), and will discuss some of the primary challenges in modeling the effects of atmospheric coupling via EPP.
Bailey Scott M.
Fang Xiao
Harvey Vanessa
Holt L. A.
Jackman Charles H.
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