Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.6195 |
Characteristics of thermal and momentum transport during the lifetime of Ural blocking highs | |
Li, Yan; Lu, Yao; Wang, Chenghai | |
2019-07-10 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
![]() |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Ural blocking (UB) event is an important large-scale weather system dominating cold waves in East Asia. This paper investigates the thermal-dynamical variation characteristics associated with UB evolution via 32 UB events in winter during 1979-2016. The results show that transport of stationary heat and momentum changes prominently from 3 and 6 days before and after UB establishment. Specifically, on 3 days prior to the UB event establishment, an apparent convergence of stationary heat flux ({v*T*}), which can extend from lower-middle troposphere to the tropopause, is observed at around 60 degrees N in the Urals region. The diagnosis shows that the convergence of stationary heat flux weakens the meridional temperature gradient (- partial differential T partial differential y) and thermal wind, and thus the zonal westerly weakens. The convergence of ({v*T*}) also support formation of the warm centre structure of UB event. Meanwhile, convergence of momentum flux reverses to be a divergence in the Urals region (60 degrees N), which contributes to decrease of the zonal wind. The heat and momentum flux reduce the intensity of the westerly and are beneficial for the establishment of UB event. Along with UB event establishment, the convergence of stationary heat flux weakens, and the divergence of momentum flux strengthens, accompanying with decrease of wind speed at middle latitudes and maintaining of the UB event. Six days later, the convergence of stationary heat flux disappears and divergence of momentum flux changes to be convergence and then the UB event collapses. Further analyses also suggest that the polar front jet (PFJ) enhances (weakens) coincidently before (after) the establishment of UB, which is attributed to the strengthening (weakening) of the convergence of ({u*v*}) around 70 degrees N. |
英文关键词 | cold waves polar front jet thermal and momentum transport Ural blocking |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477493500001 |
WOS关键词 | NORTHERN-HEMISPHERE BLOCKING ; KEY REGIONS ; CIRCULATION ; IMPACT ; WAVES ; FLOW ; REANALYSIS ; ANOMALIES ; FREQUENCY ; DYNAMICS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/184940 |
专题 | 气候变化 |
作者单位 | Lanzhou Univ, Coll Atmospher Sci, Key Lab Arid Climate Change & Reduct Gansu Prov, 222 Tianshui South Rd, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Yan,Lu, Yao,Wang, Chenghai. Characteristics of thermal and momentum transport during the lifetime of Ural blocking highs[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019. |
APA | Li, Yan,Lu, Yao,&Wang, Chenghai.(2019).Characteristics of thermal and momentum transport during the lifetime of Ural blocking highs.INTERNATIONAL JOURNAL OF CLIMATOLOGY. |
MLA | Li, Yan,et al."Characteristics of thermal and momentum transport during the lifetime of Ural blocking highs".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2019). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论