| DOI: | 10.1175/JCLI-D-18-0225.1
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| Scopus记录号: | 2-s2.0-85061787053
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| 论文题名: | Trends in tropical wave activity from the 1980s to 2016 |
| 作者: | Raghavendra A.; Roundy P.E.; Zhou L.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2019
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| 卷: | 32, 期:5 | | 起始页码: | 1661
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| 结束页码: | 1676
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| 语种: | 英语
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| 英文关键词: | Atmosphere
; Convection
; Planetary waves
; Satellite observations
; Trends
; Tropical variability
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| Scopus关键词: | Atmospheric pressure
; Climatology
; Earth atmosphere
; Gravity waves
; Heat convection
; First principal components
; Interannual variability
; Madden-Julian oscillation
; Outgoing longwave radiation
; Planetary Waves
; Satellite observations
; Trends
; Tropical variability
; Tropics
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| 英文摘要: | A frequency-wavenumber power (P) spectrum was constructed using satellite-derived outgoing longwave radiation (OLR) and brightness temperature for the tropical latitudes. Since the two datasets overlap for over 34 years with nonintersecting sources in error and compare relatively well with each other, it is possible to diagnose trends in the tropical wave activity from the two datasets with confidence. The results suggest a weakening trend in P characterized by high interannual variability for wave activity occurring in the low-frequency part of the spectrum and a steady increase in P with relatively low interannual variability for wave activity occurring in the high-frequency part of the spectrum. The results show the parts of the spectrum representing the Madden-Julian oscillation and equatorial Rossby wave losing P and other parts of the spectrum representing Kelvin waves, mixed Rossby-gravity waves, and tropical disturbance-like wave activity gaining. Similar results were obtained when trends in variance corresponding to the first principal component were produced using spectrally filtered OLR data representative of atmospheric equatorial waves. Spatial trends in the active phase of wave events and the mean duration of events are also shown for the different wave types. Linear trends in P for the entire spectrum and regional means in the spectrum corresponding to the abovementioned five wave types with confidence intervals are also presented in the paper. Finally, we demonstrate that El Niño-Southern Oscillation variability does not appear to control the overall spatial patterns and trends observed in the P spectrum. © 2019, American Meteorological Society. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/117198
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Raghavendra A.,Roundy P.E.,Zhou L.. Trends in tropical wave activity from the 1980s to 2016[J]. Journal of Climate,2019-01-01,32(5)
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