DOI: 10.1002/2016JD025376
论文题名: Parameterizing total storm conduction currents in the Community Earth System Model
作者: Kalb C. ; Deierling W. ; Baumgaertner A. ; Peterson M. ; Liu C. ; Mach D.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 22 起始页码: 715
结束页码: 734
语种: 英语
英文关键词: CESM
; conduction currents
; electrified clouds
; TRMM
Scopus关键词: climate modeling
; cloud microphysics
; cloud to ground lightning
; convective cloud
; diurnal variation
; electrical conductivity
; global change
; parameterization
; radar
; sensor
; storm surge
; TRMM
英文摘要: Electrified clouds are known to play a major role in the Global Electric Circuit. These clouds produce upward currents which maintain the potential difference between Earth's surface and the upper atmosphere. In this study, model output from two simulations of the Community Earth System Model (CESM) are compared with conduction currents and other data derived from the Tropical Rainfall Measuring Mission (TRMM) satellite, including both the Lightning Imaging Sensor and Precipitation Radar. The intention is to determine CESM's skill at representing these microphysical and dynamical properties of clouds. Then, these cloud properties are used to develop a model parameterization to compute conduction currents from electrified clouds. Specifically, we evaluate the ability of global mean convective mass flux, ice water path, and convective precipitation to represent conduction current sources. Parameterizations using these variables yield derived global mean currents that agree well with the geographical patterns of TRMM currents. In addition, comparing the diurnal variations of modeled global mean current to the observed diurnal variations of electric potential gradient, root-mean-square (RMS) errors range between 6.5% and 8.1%, but the maximum occurs 4 to 6 h early in all three variables. Output currents derived from the model variables generally match well to the currents derived from TRMM, and the total global current estimates agree well with past studies. This suggests that cloud parameters are well suited for representing the global distribution and strength of currents in a global model framework. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62784
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Department of Aerospace Engineering, University of Colorado Boulder, Boulder, CO, United States; Texas A&M University–Corpus Christi, Corpus Christi, TX, United States; Universities Space Research Association, Huntsville, AL, United States
Recommended Citation:
Kalb C.,Deierling W.,Baumgaertner A.,et al. Parameterizing total storm conduction currents in the Community Earth System Model[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)