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DOI	10.1002/joc.8481
	Revisiting two indices measuring high-frequency daily variability
	Liu, Qi; Fu, Congbin; Xu, Zhongfeng
发表日期	2024
ISSN	0899-8418
EISSN	1097-0088
英文摘要	High-frequency daily variability (HFDV), as a fundamental aspect of climate variability, has drawn increasing attention due to its crucial impacts on public health, regional ecosystems and economic growth rates. The statistical metrics are of great importance to measure the changes in HFDV. In this study, we compared two common statistical metrics of monthly HFDV, including the standard deviation (SD) and the day-to-day difference (DTDx), for various variables (temperature, specific humidity and horizontal wind) using the NCEP/NCAR reanalysis dataset. Here, we show that the SD of daily variables includes mainly sub-semiannual variability (<180 days), while DTDx can separate the synoptic variability (<12 days, DTD1), submonthly variability (<25 days, DTD3) and subseasonal variability (<60 days, DTD5) from other temporal scales. Moreover, a wider dominant timescale of DTDx causes a higher climatological mean and a closer relationship with SD. We also find that the linear trend in SD exhibits remarkable differences from that of the DTDx nearly all over the world, which can be explained by the significant change in the autocorrelation with different lag days under climate change. Our findings highlight that the DTDx is superior to SD in measuring HFDV, especially in a changing climate.
英文关键词	day-to-day temperature difference; dominant timescale; high-frequency daily variability; linear trend; standard deviation
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001220212300001
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/295768
作者单位	Nanjing University; Nanjing University; Nanjing University; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Liu, Qi,Fu, Congbin,Xu, Zhongfeng. Revisiting two indices measuring high-frequency daily variability[J],2024.
APA	Liu, Qi,Fu, Congbin,&Xu, Zhongfeng.(2024).Revisiting two indices measuring high-frequency daily variability.INTERNATIONAL JOURNAL OF CLIMATOLOGY.
MLA	Liu, Qi,et al."Revisiting two indices measuring high-frequency daily variability".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2024).