气候变化领域集成服务门户(CCPortal): How essential of the balance between large and small scale features to reproduce precipitation during a sudden sharp turn from drought to flood

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DOI	10.1007/s00382-018-4445-3
	How essential of the balance between large and small scale features to reproduce precipitation during a sudden sharp turn from drought to flood
	Ma Y.; Yang Y.; Wang C.
发表日期	2019
ISSN	0930-7575
起始页码	5013
结束页码	5029
卷号	52 期号:2020-07-08
英文摘要	Sudden turn from drought to flood (STDF) is a unique representation of intra-seasonal extreme events and occurs frequently. However, it is notoriously difficult to represent in climate simulations due to the accumulation of model errors. This study uses a regional climate model (RCM) with different initialization and nudging schemes to explore effective approaches for capturing a STDF event. Results show that the conventional continuous integration with single initialization cannot reproduce the STDF event, while nudging or re-initialization can. Furthermore, spectral nudging and re-initialization outperform the conventional continuous simulation in reproducing precipitation features, but grid nudging induces the largest biases for precipitation though it has the smallest biases for other meteorological elements. Scale separation analysis shows that the large-scale features of the conventional continuous simulation drift far from the actual fields and force erroneous small-scale features, whereas the nudging and re-initialization successfully prevent the model from drifting away from the forcing fields at large-scales. The different performance for simulating precipitation among spectral nudging, re-initialization and grid nudging can be attributed to that the former two methods generate their own small-scale information via the RCM, while grid nudging over-suppresses the small-scale information while retaining the large-scale features. The difference in small-scale features affects the simulation of different moisture fluxes and convergences, as well as clouds, and then results in diverse precipitation. These results illustrate that both the consistency with large-scale features and the local variability from small-scale features are both robust factors for reproducing precipitation features during extreme events using RCMs. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Conventional continuous simulation; Grid nudging; Re-initialization; Spectral nudging; Sudden turn from drought to flood
语种	英语
scopus关键词	climate modeling; computer simulation; drought; error analysis; extreme event; flood; numerical model; precipitation intensity; regional climate; weather forecasting
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146371
作者单位	Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China; Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Ma Y.,Yang Y.,Wang C.. How essential of the balance between large and small scale features to reproduce precipitation during a sudden sharp turn from drought to flood[J],2019,52(2020-07-08).
APA	Ma Y.,Yang Y.,&Wang C..(2019).How essential of the balance between large and small scale features to reproduce precipitation during a sudden sharp turn from drought to flood.Climate Dynamics,52(2020-07-08).
MLA	Ma Y.,et al."How essential of the balance between large and small scale features to reproduce precipitation during a sudden sharp turn from drought to flood".Climate Dynamics 52.2020-07-08(2019).