| DOI: | 10.1175/JCLI-D-18-0383.1
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| Scopus记录号: | 2-s2.0-85059629316
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| 论文题名: | A theory for the seasonal predictability barrier: Threshold, timing, and intensity |
| 作者: | Liu Z.; Jin Y.; Rong X.
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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:2 | | 起始页码: | 423
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| 结束页码: | 443
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| 语种: | 英语
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| 英文关键词: | Climate variability
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| Scopus关键词: | Climate models
; Climatology
; Damping
; Stochastic models
; Stochastic systems
; Timing circuits
; Autocorrelation functions
; Climate variability
; Delayed response
; Intrinsic features
; Seasonal forcing
; Seasonal growth
; Seasonal noise
; Stochastic climate models
; Growth rate
; autocorrelation
; climate forcing
; climate prediction
; climate variation
; growth rate
; seasonality
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| 英文摘要: | A theory is developed in a stochastic climate model for understanding the general features of the seasonal predictability barrier (PB),which is characterized by a band ofmaximumdecline in autocorrelation function phaselocked to a particular season. Our theory determines the forcing threshold, timing, and intensity of the seasonal PB as a function of the damping rate and seasonal forcing. A seasonal PB is found to be an intrinsic feature of a stochastic climate system forced by either seasonal growth rate or seasonal noise forcing. A PB is generated when the seasonal forcing, relative to the damping rate, exceeds a modest threshold. Once generated, all the PBs occur in the same calendar month, forming a seasonal PB. The PB season is determined by the decline of the seasonal forcing as well as the delayed response associated with damping. As such, for a realistic weak damping, the PB season is locked close to the minimum SST variance under the seasonal growth-rate forcing, but after the minimum SST variance under the seasonal noise forcing. The intensity of the PBis determinedmainly by the amplitude of the seasonal forcing. The theory is able to explain the general features of the seasonal PB of the observed SST variability over the world. In the tropics, a seasonal PB is generated mainly by a strong seasonal growth rate, whereas in the extratropics a seasonal PBis generatedmainly by a strong seasonal noise forcing. Our theory provides a general framework for the understanding of the seasonal PB of climate variability. © 2018 American Meteorological Society. |
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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/117251
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Liu Z.,Jin Y.,Rong X.. A theory for the seasonal predictability barrier: Threshold, timing, and intensity[J]. Journal of Climate,2019-01-01,32(2)
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