Evaluation on the CFSv2 forecasts of three cold waves during 2015–2016 in China

Wei, Zhigang; Dong, Wenjie

doi:10.1007/s00704-020-03220-5

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Different from the single‐site cold surge, the object of this article is the cold surge, which refers to the process of cold air from entering China to leaving China. In this article, we refer to the CS definitions applied in previous studies (Wei & Dong, 2020; Peng and Bueh, 2011). A CS is identified using the following thresholds.…”

Section: Methodsmentioning

confidence: 99%

Sources and paths of extreme cold surges over China and their associated atmospheric circulations

Ma,

Wei,

et al. 2024

Intl Journal of Climatology

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The extreme cold surges (ECSs) are among the extreme weather events that affect China. Here, a total of 31 ECSs that occurred from 1962 to 2018 in China were identified using observed temperature data. In addition, we used the hybrid single‐particle Lagrangian integrated trajectory (HYSPLIT) model to trace their sources. And the atmospheric circulation of ECSs with different paths were investigated. The ECSs were classified to K‐type, B‐type and S‐type ECSs (which was subdivided into the S1‐type, S2‐type and S3‐type) according to their origins and entry locations into China. The S‐type ECSs occurred the most, accounting for 58.06%. The duration and temperature drop of the K‐type ECSs were higher than those of others. And K‐type and S1‐type ECSs mainly affected Northeast China, S2‐type ECSs mainly affected the regions east of 105° E. For decadal variation, Since the 1980s, ECSs frequency has decreased (especially only one ECS occurred in the 1980s), and K‐type and S2‐type ECSs disappeared. Different types of cold surges have different atmospheric circulation characteristics. The “positive–negative–positive” wave train structures of geopotential height anomalies at 500 hPa were very conducive to the formations of K‐type, B‐type and S3‐type ECSs. For K‐type and S1‐type ECSs, the cold high gradually moved south to Siberia, and combined with the cyclone anomalies, causing the cold air to enter China. Before the B‐type ECSs occurred, cold high appeared in the west of Xinjiang, which made the southeast cold air invade China. Regarding S1‐type and S2‐type ECSs, the negative anomalies over Eurasia from day −6 to day −4 and the subsequent cyclone anomalies at 850 hPa accompanied by the southeastward extension of cold high led to ECSs.

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Section: Methodsmentioning

confidence: 99%

Sources and paths of extreme cold surges over China and their associated atmospheric circulations

Ma,

Wei,

et al. 2024

Intl Journal of Climatology

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“…For the above purpose, referring to the definition of CSs by Peng and Cholaw (2011), Wei and Dong (2020) and Wu and Ren (2021), the definition of the CS in this paper is as follows. (a) First, an area and adjacent area should meet the standard “Grade of cold wave” on a given day.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Some studies combined the daily sea level pressure (SLP) in the Siberian anticyclone centre and the surface air temperature (SAT) change in the study area to define the CSs (Woo et al, 2012;Heo et al, 2018;Yang et al, 2020). Moreover, the CSs identification algorithm included the coverage area, intensity and duration in some studies (Cellitti et al, 2006;Wei and Dong, 2020), and some algorithms also required the CSs grid points to be contiguous in space (Wheeler et al, 2011). Smith et al (2018) established a systematic cold surge index and ranking system based on a set of criteria set by magnitude and duration, and then extreme cold events (ECEs) and cold air outbreaks (CAOs) were defined according to the spatial extent.…”

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Spatial and temporal characteristics of various cold surges over China during 1962–2018

Ма

Wei

2022

Intl Journal of Climatology

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The cold surge (CS) is an extreme climate event that frequently affects China. By using a 0.25 × 0.25 gridded observation dataset provided by the China Meteorological Administration (CN05.1), this paper investigates the spatialtemporal characteristics of various CSs in China during 1962-2018. According to the duration and coverage area (CA), CSs are classified into the short-lived cold surges (SLCSs), the persistent cold surges (PCSs) and the extensive and persistent cold surges (EPCSs). They are also divided into the weak cold surges (WCSs), the strong cold surges (SCSs) and the super strong cold surges (SSCSs) based on the temperature drop (ΔT). The extreme cold surges (ECSs) are also defined and occur 38 times over 57 years. The total CSs and various CSs all display patterns of higher frequencies in the northeast and lower frequencies in the southwest. Northeast China and Inner Mongolia are frequently hit by various CSs, but the frequencies show overall downward trends in the regions during 1962-2018. The ΔT of the total CSs and ECSs both show significant decreasing trends in the whole of China from 1962 to 2018. From 1962 to 2018, the annual frequency and the ΔT of the total CSs both show decreasing trends. SLCSs and WCSs frequencies show overall increasing trends, but other kinds of CSs show overall decreasing trends. The annual frequencies of the total CSs and various CSs all have trend abrupt changes around 2000. The ΔT of ECSs shows a sharply increasing trend during 1962-2018. The total CSs and all kinds of CSs frequencies have a significant periodic oscillation. ECSs occur most in February. The total CSs and other kinds of CSs occur most in January. There are obvious differences between the multiyear average ECSs frequencies before 2000 and after 2000.

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Spatiotemporal characteristics and influencing factors for joint events of air pollution wave and cold wave in China

Huang,

Wang,

Yang

et al. 2024

Environment International

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Evaluation on the CFSv2 forecasts of three cold waves during 2015–2016 in China

Cited by 3 publications

References 19 publications

Sources and paths of extreme cold surges over China and their associated atmospheric circulations

Sources and paths of extreme cold surges over China and their associated atmospheric circulations

Spatial and temporal characteristics of various cold surges over China during 1962–2018

Spatiotemporal characteristics and influencing factors for joint events of air pollution wave and cold wave in China

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