Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080691 |
Dynamical Precursors for Statistical Prediction of Stratospheric Sudden Warming Events | |
Jucker, M.1,2,3; Reichler, T.4 | |
2018-12-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:23页码:13124-13132 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA |
英文摘要 | This work explores dynamical arguments for statistical prediction of stratospheric sudden warming events (SSWs). Based on climate model output, it focuses on two predictors, upward wave activity in the lower stratosphere and meridional potential vorticity gradient in the upper stratosphere, and detects large values of these predictors. Then it quantifies how many SSWs are preceded by predictor events and, inversely, how many events are followed by SSWs. This allows to compute conditional probabilities of future SSW occurrence. It is found that upward wave activity leads to important increases in SSW probability within the following 3 weeks but is less important thereafter. A weak potential vorticity gradient is associated with increased SSW probability at short lags and, perhaps more importantly, decreased SSW probability at long lags. Finally, when both predictors are considered in combination, the information gain is large on the weekly and small but significant on the intraseasonal time scale. Plain Language Summary After a breakdown of the polar vortex in the winter hemisphere stratosphere, Northern Hemisphere weather can be unusual for several months or even weeks. Therefore, there is great interest in being able to predict these breakdowns, which are known as stratospheric sudden warming events. The traditional way of forecasting these events is to run full climate models forward in time similar to everyday weather forecasting. However, this is computationally expensive and model skill is very low beyond about 2 weeks. This study explores a new, probabilistic way of prediction based on dynamical arguments. It uses the past evolution of the stratosphere to construct probabilities of occurrence as a function of lead time. It shows that meaningful information can be obtained for an entire extended winter season, which is an order of magnitude longer than traditional model forecasting. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454296600053 |
WOS关键词 | WINTER STRATOSPHERE ; PART II ; PLANETARY ; PROPAGATION ; WEATHER ; MODEL ; DISTURBANCES ; CLIMATOLOGY ; VARIABILITY ; WAVES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28939 |
专题 | 气候变化 |
作者单位 | 1.Univ Melbourne, Sch Earth Sci, Melbourne, Vic, Australia; 2.Univ Melbourne, ARC Ctr Excellence Climate Syst Sci, Melbourne, Vic, Australia; 3.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia; 4.Univ Utah, Dept Atmospher Sci, Salt Lake City, UT USA |
推荐引用方式 GB/T 7714 | Jucker, M.,Reichler, T.. Dynamical Precursors for Statistical Prediction of Stratospheric Sudden Warming Events[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(23):13124-13132. |
APA | Jucker, M.,&Reichler, T..(2018).Dynamical Precursors for Statistical Prediction of Stratospheric Sudden Warming Events.GEOPHYSICAL RESEARCH LETTERS,45(23),13124-13132. |
MLA | Jucker, M.,et al."Dynamical Precursors for Statistical Prediction of Stratospheric Sudden Warming Events".GEOPHYSICAL RESEARCH LETTERS 45.23(2018):13124-13132. |
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