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Dynamic initialization of whole-atmospheric global modeling

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Title
Dynamic initialization of whole-atmospheric global modeling
Other Titles
전층대기 전지구 모델링을 위한 역학적 초기화
Authors
Song, In-Sun
Chun, Hye-Yeong
Jee, Geonhwa
Kim, So-Young
Kim, Junghan
Kim, Young-Ha
Taylor, Mark
Keywords
Dynamic initialization; Gravity waves; Nonlinear balance
Issue Date
2018
Citation
Song, In-Sun, et al. 2018. Dynamic initialization of whole-atmospheric global modeling. AGU Triennial Earth-Sun Summit (TESS) 2018. Leesburg, VA. 2018.05.20~2018.05.24.
Abstract
Dynamic initialization method is presented to produce balanced initial conditions for whole atmospheric global modeling. In this method, a global hydrostatic numerical model is iteratively nudged toward ground-to-space wind and temperature profiles at specific date and time. Ground-to-space atmospheric profiles are obtained by fitting spline curves to reanalyses below the lower mesosphere and empirical model results in the upper atmosphere. An optimal nudging coefficient is determined by examining if reasonable structure of mesospheric gravity wave (GW) momentum forcing and residual mean meridional circulations can be obtained from balanced initial conditions. Estimated mesospheric GW momentum forcing is found to exhibit a distinctive structure with larger (smaller) values in the lower and upper mesosphere (in the midmesosphere), when compared with parameterized climatological forcing. The iterative dynamic initialization allows for dynamical balance among the model’s prognostic variables and reduces excitation of spurious GWs and noises at initial time. However, theoretical imbalances, measured by the ellipticity of the nonlinear balance equation, are not completely eliminated in balanced flows, and they are found in narrow tropospheric frontal regions and over localized areas associated with the large-scale instability in the midlatitude middle atmosphere. These imbalances are discussed in the context of their potential relation to generation of planetary-scale and inertia GWs around the middle atmospheric and tropospheric jets.
URI
https://repository.kopri.re.kr/handle/201206/12568
Conference Name
AGU Triennial Earth-Sun Summit (TESS) 2018
Conference Place
Leesburg, VA
Conference Date
2018.05.20~2018.05.24
Appears in Collections  
2017-2018, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (17-18) / Jee, Geonhwa (PE17020; PE18020)
2018-2018, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (18-18) / Jee, Geonhwa (PE18020)
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