DOI: 10.1002/2015GL066868
论文题名: Effect of solar zenith angle specification in models on mean shortwave fluxes and stratospheric temperatures
作者: Hogan R.J. ; Hirahara S.
刊名: Geophysical Research Letters
ISSN: 0094-9528
EISSN: 1944-9259
出版年: 2016
卷: 43, 期: 1 起始页码: 482
结束页码: 488
语种: 英语
英文关键词: radiation scheme
; solar zenith angle
; stratospheric temperature
Scopus关键词: Climate models
; Incident solar radiation
; Direct solar
; Incident flux
; Solar zenith angle
; Stratospheric temperature
; Temperature bias
; Top of atmospheres
; Wave numbers
; Weather and climate models
; Atmospheric temperature
英文摘要: Many weather and climate models call their radiation schemes only every 3 h, which we show can lead to a stratospheric temperature overestimate of 3-5 K and wavenumber 8 fluctuations in top-of-atmosphere (TOA) net shortwave flux around the tropics of amplitude 1.6 W m-2. Solving this problem while retaining a 3h radiation time step requires careful treatment of the cosine of the solar zenith angle, μ0, which appears twice in the calculation of shortwave fluxes, scaling the following: (1) TOA incident flux and (2) the path length of the direct solar beam through the atmosphere. If μ0 is calculated as the average over the radiation time step, rather than at the central time, then the fluctuations are removed, but the stratosphere is still too warm by 2-3 K. It is only if the second μ0 is averaged only over the sunlit part of the radiation time step that the temperature bias is removed. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956977623&doi=10.1002%2f2015GL066868&partnerID=40&md5=66378efba822fbaf40f56e3e902c1c66
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10491
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
Recommended Citation:
Hogan R.J.,Hirahara S.. Effect of solar zenith angle specification in models on mean shortwave fluxes and stratospheric temperatures[J]. Geophysical Research Letters,2016-01-01,43(1).