scholarly journals The climate reconstruction in Shandong Peninsula, North China during the last millennia based on stalagmite laminae

2015 ◽  
Vol 11 (5) ◽  
pp. 4643-4668
Author(s):  
Q. Wang ◽  
H. Zhou ◽  
K. Cheng ◽  
H. Chi ◽  
C. Shen ◽  
...  
Keyword(s):  
East Asia ◽  
Layer Thickness ◽  
Summer Monsoon ◽  
Temperate Zone ◽  
Thickness Variation ◽  
East Asia Monsoon ◽  
Monsoon Area ◽  
Monsoon Intensity ◽  
Warm Temperate Zone ◽  
Warm Temperate

Abstract. Stalagmite ky1 was collected from Kaiyuan Cave in coastal areas of Shandong Peninsula, northern China, located at warm temperate zone and East Asia monsoon area, it was 75 mm in length, and the top 42.77 mm developed 678 laminae. Based on high precision dating with U-230Th technique, by continuous laminae counting, it can be confirmed that the 1st and 678th layer were 1217 and 1892 AD from top to bottom respectively. By the measurement of layer thickness and δ18O values, we got the layer thickness data and δ18O value time series data from 1217 to 1892 AD, analyzed the climatic significance of layer thickness variation on the basis of comparison. The result show that, in the 678 years from 1217 to 1892 AD, both the layer thickness variation of stalagmite ky1 and the variation of layer thickness fluctuation degree have obvious staged characteristic, and completely synchronized with the contemporaneous summer monsoon intensity/precipitation in time. Among, the thickness of layer and summer monsoon intensity/precipitation have negative correlation themselves. On the other hand, the layer thickness and the fluctuation degree of summer monsoon intensity/precipitation have positive correlation themselves. Therefore, Kaiyuan Cave, in the coastal area of warm temperate zone and East Asia monsoon area, the variation of layer thickness are relate to climatic factors variation themselves, and relate to climate stability degree in addition. For to achieve this, in the coastal area of warm temperate zone and East Asia monsoon area, the climate change between LIA and MWP, in addition to presented like less precipitation and low temperature that is to say dry and cold, also showed the climate stability degree obvious decreased.

scholarly journals The climate reconstruction in Shandong Peninsula, northern China, during the last millennium based on stalagmite laminae together with a comparison to <i>δ</i><sup>18</sup>O

2016 ◽  
Vol 12 (4) ◽  
pp. 871-881 ◽  
Author(s):  
Qing Wang ◽  
Houyun Zhou ◽  
Ke Cheng ◽  
Hong Chi ◽  
Chuan-Chou Shen ◽  
...  
Keyword(s):  
East Asia ◽  
Coastal Area ◽  
Northern China ◽  
Temperate Zone ◽  
Cold Climate ◽  
Shandong Peninsula ◽  
East Asia Monsoon ◽  
Monsoon Area ◽  
Warm Temperate Zone ◽  
Warm Temperate

Abstract. Stalagmite ky1, with a length of 75 mm and the upper part (from top to 42.769 mm depth) consisting of 678 laminae, was collected from Kaiyuan Cave in the coastal area of Shandong Peninsula, northern China, located in a warm temperate zone in the East Asia monsoon area. Based on high-precision dating with the U–230Th technique and continuous counting of laminae, the 1st and 678th laminae have been confirmed to be AD 1894 ± 20 and 1217 ± 20 from top to bottom, respectively. By the measurement of laminae thickness and δ18O ratios, we haved obtained the time series data of thickness of laminae and δ18O ratios from AD 1217 ± 20 to 1894 ± 20, analyzed the climatic–environmental meaning of variations in the thickness of laminae, which have a good correspondence with the cumulative departure curve of the drought–waterlog index in the historical period. The results show that, in the  ∼  678 years from AD 1217 ± 20 to 1894 ± 20, both the thickness of the laminae and the degree of fluctuation in the thickness of the laminae of stalagmite ky1 have obvious stages of variation and are completely synchronized with the contemporaneous intensity of the summer monsoons and precipitation as time changed. There is a negative correlation between the thickness of the laminae and the summer monsoon intensity and precipitation. There is a positive correlation between the degree of fluctuation in the thickness of the laminae and both the intensity of the summer monsoons and the precipitation. Therefore, for the Kaiyuan Cave in the coastal area of both the warm temperate zone and the East Asia monsoon area, the variations in the thickness of the laminae are not only related to the change in the climatic factors themselves but also related to the degree of climatic stability. In the coastal area belonging to the warm temperate zone and the East Asia monsoon area, the climate change between the LIA (Little Ice Age) and the MWP (Medieval Warm Period), in addition to less precipitation and low temperatures (a type of dry and cold climate), also shows an obviously decreasing trend in the degree of climatic stability.

scholarly journals Process-Based Indicators for Timely Identification of Apricot Frost Disaster on the Warm Temperate Zone, China

2021 ◽  
Author(s):  
Yang Jianying ◽  
Zhiguo Huo ◽  
Peijuan Wang ◽  
Wu Dingrong ◽  
Yuping Ma
Keyword(s):  
Economic Value ◽  
Temperate Zone ◽  
Late Spring ◽  
Cold Weather ◽  
Accurate Identification ◽  
Spring Frost ◽  
Late Spring Frost ◽  
Disaster Data ◽  
Warm Temperate Zone ◽  
Warm Temperate

Abstract Frequent occurrences of extreme cold weather processes create severe agricultural/forest frost events, even given the background of global warming. In the warm temperate zone of China, which is the largest planting area for fresh apricot, late spring frost disaster has become one of the major meteorological hazards during flowering. To prevent cold weather-induced apricot frost events and reduce potential losses in related fruit economic value, it is vital to establish a meteorological indicator for timely and accurate identification of cold weather process-based apricot frost events, to provide support for timely apricot frost monitoring and warning in late spring. In this study, daily minimax temperature (Tmin) and apricot frost disaster data during flowering were combined to establish meteorological identification indicators of apricot frost based on cold weather processes. A process-based apricot frost model (f(D,Tcum) was firstly constructed, and characteristics of (Tcum) (accumulated harmful temperature) were explored under different D (duration days) based on the representation of historical apricot frost processes. Thresholds for the (Tcum) for apricot frost in 1, 2, 3, 4 and more than 5 days of apricot frost process were determined as -1.51, -2.92, -4.39, -5.84 and − 7.31°C, respectively. Validation results by reserved independent disaster samples were generally consistent with the historical records of apricot frost disasters, with 89.00% accuracy for indicator-based identification results. Typical process tracking of the proposed identification indicator to an apricot frost event that occurred in North Hebei during April 3–9, 2018 revealed that the indicator-based identification result basically coincides with the historical disaster record and can reflect more detailed information about the apricot frost process.

scholarly journals Significant impact of the East Asia monsoon on ozone seasonal behavior in the boundary layer of Eastern China and the west Pacific region

2008 ◽  
Vol 8 (24) ◽  
pp. 7543-7555 ◽  
Author(s):  
Y. J. He ◽  
I. Uno ◽  
Z. F. Wang ◽  
P. Pochanart ◽  
J. Li ◽  
...  
Keyword(s):  
Boundary Layer ◽  
East Asia ◽  
Summer Monsoon ◽  
Eastern China ◽  
Pacific Region ◽  
The West ◽  
Seasonal Behavior ◽  
West Pacific ◽  
East Asia Monsoon ◽  
Monsoon Index

Abstract. The impact of the East Asia monsoon on the seasonal behavior of O3 in the boundary layer of Eastern China and the west Pacific region was analyzed for 2004–2006 by means of full-year nested chemical transport model simulations and continuous observational data obtained from three inland mountain sites in central and eastern China and three oceanic sites in the west Pacific region. The basic common features of O3 seasonal behaviors over all the monitoring sites are the pre- and post-monsoon peaks with a summer trough. Such bimodal seasonal patterns of O3 are predominant over the region with strong summer monsoon penetration, and become weaker or even disappear outside the monsoon region. The seasonal/geographical distribution of the pre-defined monsoon index indicated that the East Asia summer monsoon is responsible for the bimodal seasonal O3 pattern, and also partly account for the differences in the O3 seasonal variations between the inland mountain and oceanic sites. Over the inland mountain sites, the O3 concentration increased gradually from the beginning of the year, reached a maximum in June, decreased rapidly to the summer valley in July or August, and then peaked in September or October, thereafter decreased gradually again. Over the oceanic sites, O3 abundance showed a similar increasing trend beginning in January, but then decreased gradually from the end of March, followed by a wide trough with the minimum in July and August and a small peak in October or November. A sensitivity analysis performed by setting China-emission to zero revealed that the chemically produced O3 from China-emission contributed substantially to the O3 abundance, particularly the pre- and post-monsoon O3 peaks, over China mainland. We found that China-emission contributed more than 40% to total boundary layer O3 during summertime (60–70% in July) and accounted for about 40 ppb of each peak value over the inland region if without considering the effect of the nonlinear chemical productions. In contrast, over the oceanic region in the high monsoon index zone, the contribution of China-emission to total boundary layer O3 was always less than 20% (<10 ppb), and less than 10% in summer.

Late Guadalupian (Middle Permian) Fusuline Fauna from the Xiala Formation in Xainza County, Central Tibet: Implication of the Rifting Time of the Lhasa Block

2010 ◽  
Vol 84 (5) ◽  
pp. 955-973 ◽  
Author(s):  
Yi-Chun Zhang ◽  
Li-Ren Cheng ◽  
Shu-Zhong Shen
Keyword(s):  
Temperate Zone ◽  
Middle Permian ◽  
The North ◽  
Warm Temperate Zone ◽  
Central Tibet ◽  
Warm Temperate

A fusuline fauna consisting of 9 species of 4 genera from the Xiala Formation of the Mujiucuo section, Xainza County, Tibet, China is described. The fusuline fauna is dominated byNankinellaandChusenellaand indicates a Midian (Late Guadalupian) age. The earliest record of fusuline fauna during the Midian in the Lhasa Block suggests that the block rifted later than the Qiangtang Block to the north and the Baoshan and Tengchong blocks to the east, all of which yield much earlier fusuline faunas of Yakhtashian (Artinskian) age, but had drifted away from Gondwana to a relatively warm temperate zone in the Late Guadalupian (Middle Permian).

scholarly journals Process-based indicators for timely identification of apricot frost disaster on the warm temperate zone, China

2021 ◽  
Author(s):  
Jianying Yang ◽  
Zhiguo Huo ◽  
Peijuan Wang ◽  
Dingrong Wu ◽  
Yuping Ma ◽  
...  
Keyword(s):  
Temperate Zone ◽  
Warm Temperate Zone ◽  
Warm Temperate
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