Recent warming evidence inferred from a tree-ring-based winter-half year minimum temperature reconstruction in northwestern Yichang, South Central China, and its relation to the large-scale circulation anomalies

2016 ◽  
Vol 60 (12) ◽  
pp. 1885-1896 ◽  
Author(s):  
Qiufang Cai ◽  
Yu Liu ◽  
Yanchao Wang ◽  
Yongyong Ma ◽  
Han Liu
Keyword(s):  
Tree Ring ◽  
Minimum Temperature ◽  
Large Scale ◽  
Temperature Reconstruction ◽  
Central China ◽  
Large Scale Circulation ◽  
South Central ◽  
Recent Warming ◽  
Winter Half ◽  
Circulation Anomalies

Large-Scale Circulation Anomalies Associated with Extreme Heat in South Korea and Southern–Central Japan

2020 ◽  
Author(s):  
Ke Xu
Keyword(s):  
South Korea ◽  
East Asia ◽  
Large Scale ◽  
Extreme Heat ◽  
Central Japan ◽  
Large Scale Circulation ◽  
Westerly Jet ◽  
Anomalous Anticyclone ◽  
Wave Trains ◽  
Circulation Anomalies

<p>    The large-scale circulation anomalies associated with extreme heat (EH) in South Korea and southern–central Japan are examined using data during the time period 1979–2016. Statistical analysis indicates that EH days in these two regions are concentrated in July and August and tend to occur simultaneously. These EH days are therefore combined to explore the physical mechanisms leading to their occurrence. The composite results indicate that the anomalous atmospheric warming during EH days is dominantly caused by a significant subsidence anomaly, which is associated with a deep anomalous anticyclone over East Asia. Further investigation of the evolution of circulation anomalies suggests that the anomalous anticyclone over East Asia related to EH is primarily initiated by wave trains originating from upstream regions, which propagate eastward along the Asian westerly jet in the upper troposphere. These wave trains can be categorized into two types that are characterized by the precursor anticyclonic and cyclonic anomalies, respectively, over central Asia. The distinction between these two types of wave train can be explained by the wavenumbers of the Rossby waves, which are modulated by both the intensity and the shape of the Asian westerly jet as the background basic flow.</p>

scholarly journals A 333-year record of the mean minimum temperature reconstruction in the Western Tianshan Mountains, China

2019 ◽  
Vol 46 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Liang Jiao ◽  
Shengjie Wang ◽  
Yuan Jiang ◽  
Xuerui Liu
Keyword(s):  
Minimum Temperature ◽  
Large Scale ◽  
Climatic Factors ◽  
Moving Average ◽  
Temperature Reconstruction ◽  
Warming Trend ◽  
Limiting Factor ◽  
Western Tianshan ◽  
The Mean ◽  
The Relationship

Abstract In this paper, a fragile ecological area in the Western Tianshan National Nature Reserve of China was selected as the research region, and Picea schrenkiana, which is sensitive to climate change, was selected as the research object. The mean minimum temperature in the growing season of the previous year (May to September) was the main limiting factor for tree radial growth based on an analysis of the relationship between chronological series and climatic factors during 1959–2012 (r = –0.792, p < 0.05). Moreover, the relationship was stable, which showed that tree rings can be used as alternative materials for climate reconstruction. Therefore, the mean minimum temperature of the previous year in 1680–2012 was reconstructed, and the explained variance of the reconstruction equation was 62.7% (R2adj = 62.0%, F = 85.8). The 31 dramatically altered years were found via characteristic year analyses, and extreme changes occurred most often under relatively warm conditions. The mean minimum temperature in the reconstruction shows a clear warming trend by the 11-year moving average of the reconstructive series since the 1950s (the temperature increase: 0.341°C/decade). The driving factors of the mean minimum temperature were influenced mainly by the interaction of solar activity and large-scale atmospheric–oceanic variability, especially the westerly circulations.

Tree-ring based minimum temperature reconstruction on the southeastern Tibetan Plateau

2021 ◽  
Vol 251 ◽  
pp. 106712
Author(s):  
Maierdang Keyimu ◽  
Zongshan Li ◽  
Guohua Liu ◽  
Bojie Fu ◽  
Zexin Fan ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Tree Ring ◽  
Minimum Temperature ◽  
Temperature Reconstruction ◽  
Southeastern Tibetan Plateau

scholarly journals Two centuries-long dendroclimatic reconstruction based on Low Arctic Betula pubescens from Tromsø Region, Northern Norway

2016 ◽  
Vol 37 (4) ◽  
pp. 457-476 ◽  
Author(s):  
Magdalena Opała ◽  
Krzysztof Migała ◽  
Piotr Owczarek
Keyword(s):  
Tree Ring ◽  
Large Scale ◽  
Function Analysis ◽  
Temperature Reconstruction ◽  
Climatic Conditions ◽  
Betula Pubescens ◽  
Sea Ice Extent ◽  
Northern Norway ◽  
Mountain Glaciers ◽  
Tree Ring Data

Abstract This study presents the results of dendrochronological and dendroclimatological research of Betula pubescens from four sites in northern Norway (Kvaløya Island, Tromsøya Island and Storelva Valley), which provided a 193-year chronology. Our results highlight the importance of the site selection in dendroclimatological studies. We demonstrated that activity of geomorphic processes connected with local topography could led to reduced strength of climatic signal embedded in tree-ring data. Negative pointer years, triggered mainly by unfavourable climatic conditions and insect outbreaks, were common for all site chronologies in 1945, 1955, 1965, 1975, 1986, 2004. However, some site-specific differences were also distinguished. Response function analysis confirmed that June, July and August temperatures were positively correlated with tree-ring widths. This climate-growth relationship was stable throughout the years 1925–2000. From summer temperature reconstruction back to AD 1820, two colder (c. 1835–1850 and 1890–1920) and two warmer (c. 1825–1835 and 1920–1940) periods were identified. The tree-ring record from the Tromsø Region, well correlated between series, sites and climate variables, is an important element of a large-scale reconstruction of pre-instrumental climate variation in the northeastern part of the Atlantic Ocean. Our dendroclimatic reconstruction corresponds well with other climate proxy data, like fluctuations of mountain glaciers in Scandinavia or sea ice extent.

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