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DOI10.1029/2018GL081190
Interpreting Rainfall Anomalies Using Rainfall's Nonnegative Nature
Wang, Shixin1; Zuo, Hongchao2; Yin, Yixing1; Hu, Chundi3,4; Yin, Jun5; Ma, Xieyao1; Wang, Jujie6
发表日期2019
ISSN0094-8276
EISSN1944-8007
卷号46期号:1页码:426-434
英文摘要

Previous studies emphasized the role of transient disturbances in linking interannual variation of average rainfall (IVAR; average period>1month) to external climate forcings. Researchers conventionally use transient eddy-driven horizontal fluxes of certain variables to explain the IVAR, which is not universally applicable to disturbance-associated IVAR research because these variables' horizontal distributions can drastically affect their fluxes. Here we demonstrate that the strengthened transient disturbance activities can directly impact IVAR positively in almost all extratropical terrestrial regions in each season. This impact occurs because disturbance strengthened daily downward motions cannot generate negative rainfall to compensate for the increased rainfall generated by disturbance enhanced daily upward motions. This is much more universally applicable to disturbance-associated IVAR research because it derives transient eddies' direct and independent impacts on IVAR. Because of this impact, the horizontal heterogeneity of global warming rate can modify the long-term trend of extratropical terrestrial rainfall through disturbance activity trend.


Plain Language Summary Transient disturbance activity (the day-to-day component of atmospheric circulation variance) is often used to explain monthly/seasonal-scale rainfall anomalies in many regions, which is conventionally through anomalous transient disturbances-conveyed horizontal fluxes of certain variables. Horizontal flux anomalies are drastically affected by variables' horizontal distributions, which makes the above explanation hard to be universally applied to rainfall anomaly research in various regions and seasons. In this study, we demonstrate that the enhanced transient disturbance activity can directly cause positive monthly/seasonal-scale rainfall anomalies in most extratropical terrestrial regions throughout the world, which occurs because rainfall is always nonnegative. The present revelation is much more universally applicable to research on the rainfall anomalies associated with anomalous disturbance activities than the traditional one. The new revelation will greatly improve our understanding of how external forcing (e.g., El Nino) impact terrestrial rainfall anomalies via changing transient disturbance activities.


WOS研究方向Geology
来源期刊GEOPHYSICAL RESEARCH LETTERS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/92147
作者单位1.Nanjing Univ Informat Sci & Technol, Sch Hydrol & Water Resources, Nanjing, Jiangsu, Peoples R China;
2.Lanzhou Univ, Coll Atmospher Sci, Lanzhou, Gansu, Peoples R China;
3.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China;
4.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Zhuhai, Peoples R China;
5.Princeton Univ, Civil & Environm Engn, Princeton, NJ 08544 USA;
6.Nanjing Univ Informat Sci & Technol, Climate & Weather Disasters Collaborat Innovat Ct, Nanjing, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714
Wang, Shixin,Zuo, Hongchao,Yin, Yixing,et al. Interpreting Rainfall Anomalies Using Rainfall's Nonnegative Nature[J],2019,46(1):426-434.
APA Wang, Shixin.,Zuo, Hongchao.,Yin, Yixing.,Hu, Chundi.,Yin, Jun.,...&Wang, Jujie.(2019).Interpreting Rainfall Anomalies Using Rainfall's Nonnegative Nature.GEOPHYSICAL RESEARCH LETTERS,46(1),426-434.
MLA Wang, Shixin,et al."Interpreting Rainfall Anomalies Using Rainfall's Nonnegative Nature".GEOPHYSICAL RESEARCH LETTERS 46.1(2019):426-434.
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