globalchange  > 过去全球变化的重建
DOI: 10.5194/acp-19-5661-2019
WOS记录号: WOS:000466564900005
论文题名:
Global tropopause altitudes in radiosondes and reanalyses
作者: Xian, Tao1,2; Homeyer, Cameron R.1
通讯作者: Homeyer, Cameron R.
刊名: ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN: 1680-7316
EISSN: 1680-7324
出版年: 2019
卷: 19, 期:8, 页码:5661-5678
语种: 英语
WOS关键词: TROPICAL TROPOPAUSE ; PENETRATING CONVECTION ; RESIDUAL CIRCULATION ; OZONE ; STRATOSPHERE ; CLIMATOLOGY ; VARIABILITY ; EXCHANGE ; JETS ; ASSIMILATION
WOS学科分类: Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向: Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
英文摘要:

Accurate depictions of the tropopause and its changes are important for studies on stratosphere-troposphere exchange and climate change. Here, the fidelity of primary lapse-rate tropopause altitudes and double tropopause frequencies in four modern reanalyses (ERA-Interim, JRA-55, MERRA-2, and CFSR) is examined using global radiosonde observations. In addition, long-term trends (1981-2015) in these tropopause properties are diagnosed in both the reanalyses and radiosondes. It is found that reanalyses reproduce observed tropopause altitudes with little bias (typically less than +/- 150 m) and error comparable to the model vertical resolution. All reanalyses underestimate the double tropopause frequency (up to 30% lower than observed), with the largest biases found in JRA-55 and the smallest in CFSR. The underestimates in double tropopause frequency are primarily attributable to the coarse vertical resolution of the reanalyses. Significant increasing trends in both tropopause altitude (40-120 m per decade) and double tropopause frequency (>= 3% per decade) were found in both the radiosonde observations and the reanalyses over the 35-year analysis period (1981-2015). ERA-Interim, JRA-55, and MERRA-2 broadly reproduce the patterns and signs of observed significant trends, while CFSR is inconsistent with the remaining datasets. Trends were diagnosed in both the native Eulerian coordinate system of the reanalyses (fixed longitude and latitude) and in a coordinate system where latitude is defined relative to the mean latitude of the tropopause break (the discontinuity in tropopause altitude between the tropics and extratropics) in each hemisphere. The coordinate relative to the tropopause break facilitates the evaluation of tropopause behavior within the tropical and extratropical reservoirs and revealed significant differences in trend estimates compared to the traditional Eulerian analysis. Notably, increasing tropopause altitude trends were found to be of greater magnitude in coordinates relative to the tropopause break, and increasing double tropopause frequency trends were found to occur primarily poleward of the tropopause break in each hemisphere.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/136786
Appears in Collections:过去全球变化的重建

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作者单位: 1.Univ Oklahoma, Sch Meteorol, Norman, OK 73072 USA
2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China

Recommended Citation:
Xian, Tao,Homeyer, Cameron R.. Global tropopause altitudes in radiosondes and reanalyses[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019-01-01,19(8):5661-5678
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