Analysis of extreme low-temperature events during the warm season in Northeast China

2011 ◽  
Vol 58 (3) ◽  
pp. 1333-1344 ◽  
Author(s):  
Xiao Fengjin ◽  
Song Lianchun
Keyword(s):  
Low Temperature ◽  
Northeast China ◽  
Warm Season

scholarly journals Association Between Meteorological Factors and Coronary Heart Disease in Northeast China

2020 ◽  
Author(s):  
Jinling Huang ◽  
Liqiang Zheng ◽  
Jinghai Zhu
Keyword(s):  
Coronary Heart Disease ◽  
Heart Disease ◽  
Northeast China ◽  
Protective Factor ◽  
Meteorological Factors ◽  
Meteorological Data ◽  
Warm Season ◽  
Multiple Linear Regression Model ◽  
Population Data ◽  
The Impact

Abstract Background: To investigate the effect of daily meteorological factors in northeast China on coronary heart disease and explore in depth the impact of the environment on health. Methods: The population data primarily included daily coronary heart disease hospitalizations between January 1, 2015 and December 31, 2019, comprising a total of 25,461 patients. The meteorological data included daily temperature, barometric pressure, relative humidity, precipitation, and wind speed between January 1, 2015 and December 31, 2019. A multiple linear regression model was constructed for analyzing the relationship between meteorological factors and coronary heart disease.Results: After controlling for confounding factors, the mean monthly temperature negatively correlated with the monthly number of coronary heart disease hospitalizations, particularly in the warm season (Apr–Sep; β = –12.468, p < 0.05).Conclusions: In the warm season and during a mild weather, high temperature might be a protective factor against coronary heart disease.

scholarly journals Wintertime Cold Extremes in Northeast China and Their Linkage with Sea Ice in Barents-Kara Seas

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 386
Author(s):  
Yongyue Luo ◽  
Chun Li ◽  
Jian Shi ◽  
Xiadong An ◽  
Yaqing Sun
Keyword(s):  
Low Temperature ◽  
Sea Ice ◽  
Interannual Variability ◽  
Geopotential Height ◽  
Northeast China ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Polar Regions ◽  
Northerly Wind ◽  
Cold Air

The impacts of Arctic sea ice on the interannual variability of winter extreme low temperature (WELT) in Northeast China (NEC) and the associated atmospheric circulation patterns are explored in this study based on meteorological observation and the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP/NCAR) reanalysis data. Results show that WELT in NEC has prominent interannual variability. We further use ±0.8 standard deviation as the threshold to select the years of frequent and rare extreme low temperature anomalies. Using composite analysis, we find that there are significant negative geopotential height anomalies at 500 hPa over NEC and positive geopotential height anomalies along the Arctic region, which represent the intensification of the East Asian trough (EAT) and the negative Arctic Oscillation (AO) phase in the years of more frequent WELT. The opposite characteristics are detected in the years of rare WELT. Furthermore, we determine that the Barents-Kara Seas are key sea ice regions in Arctic area. In the years of frequent WELT, the decrease of autumn Barents-Kara Seas sea ice and the positive sea surface temperature anomaly can last until the following winter, which is conducive to the intensification of anticyclonic anomalies in Ural regions and the northward extension of Ural ridge (UR). The northerly flow in front of UR guides the cold air penetrating southward from polar regions. Moreover, the anomalous cyclone over East Asia deepens the EAT. The northerly wind behind EAT guides the cold air to the NEC region, causing the wintertime low temperature there. The almost opposite situation occurs in the years of rare WELT.

Light Intensity: the Role Player in Cucumber Response to Cold Stress

2021 ◽  
Author(s):  
Tahereh Ashrestaghi ◽  
Sasan Aliniaeifard ◽  
Aida Shomali ◽  
Shiva Azizinia ◽  
Jahangir Abbasi Koohpalekani ◽  
...  
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Cold Stress ◽  
Low Temperatures ◽  
Warm Season ◽  
Water Soluble ◽  
Photon Flux ◽  
Soluble Carbohydrate ◽  
Dependent Manner ◽  
Biochemical Traits

Abstract Low temperatures are an important limitation for geographic distributions of warm-season crops like cucumber (Cucumis sativus L.). Tolerance to low temperatures varies among different plant species and genotypes when changes in normal environmental cues occur. To cope with low temperature, biochemical and biophysical events should be coordinated to form a physiological response. We examined how light intensity influences the effects of low temperature on photosynthesis machinery and some biochemical traits. We used chlorophyll fluorescence imaging and polyphasic fluorescence transient (OJIP) to analyze cold stress (4 ºC) damage to photosynthetic electron transport chain (ETC) under different Photosynthetic Photon Flux Densities (PPFDs; 0, 300 and 600 μmol m-2 s-1), in four accessions of cucumber. The results showed that, the negative effects of cold stress are PPFD-dependent. The adverse effect of cold stress on ETC was more pronounced in plants exposed to 600 μmol m-2 s-1 compared to the control and dark-exposed plants; indicated by disturbance in ETC and higher energy dissipation. Moreover, biochemical traits including H2O2 content, ascorbate peroxidase activity and electrolyte leakage, and water-soluble carbohydrate was increased under low temperature by increase in PPFD, while chlorophyll and carotenoid contents decreased under low temperature by PPFD elevation. Low temperature induced H2O2 accumulation via suppressing APX activity in a PPFD-dependent manner. In conclusion, high PPFDs exacerbate the adverse effects of low temperature on the cucumber seedlings.

Impact evaluation of low temperature to yields of maize in Northeast China based on crop growth model

2012 ◽  
Vol 32 (13) ◽  
pp. 4132-4138 ◽  
Author(s):  
张建平 ZHANG Jianping ◽  
王春乙 WANG Chunyi ◽  
赵艳霞 ZHAO Yanxia ◽  
杨晓光 YANG Xiaoguang ◽  
王靖 WANG Jing
Keyword(s):  
Low Temperature ◽  
Growth Model ◽  
Impact Evaluation ◽  
Northeast China ◽  
Crop Growth ◽  
Crop Growth Model

scholarly journals The influences of admixtures on the characteristics of pore structure of low-temperature concrete under different curing conditions

2019 ◽  
Vol 136 ◽  
pp. 03009
Author(s):  
Yue Tian ◽  
Wanlai Zhang ◽  
Yihang Zhang
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
Pore Structure ◽  
Northeast China ◽  
Curing Conditions ◽  
Different Types ◽  
Compressive Strength Of Concrete ◽  
Curing Condition ◽  
Curing Method ◽  
China Region

Based on the construction characteristics in the Northeast China Region under low temperature conditions, this article studies the influences of admixtures without antifreezing agent of different types and amounts on the low-temperature concrete and characteristics of pore structure. The results show that the amount of the admixtures is stable, the compressive strength of concrete under the curing condition of low temperature naturally varying is higher than the strength under the curing condition of constant low temperature while the porosity of the concrete under the curing condition of low temperature naturally varying is lower than the porosity under the curing condition of constant low temperature; The most appropriate curing method for the concrete used in winter construction is the curing method of low temperature naturally varying.

The 2009 summer low temperature in northeast china and its association with prophase changes of the air-sea system

2012 ◽  
Vol 26 (4) ◽  
pp. 438-453 ◽  
Author(s):  
Baizhu Shen ◽  
Shi Liu ◽  
Yi Lian ◽  
Guolin Feng ◽  
Shangfeng Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Northeast China

Environmental Exposure and Childhood Atopic Dermatitis in Shanghai: A Season-Stratified Time-Series Analysis

Dermatology ◽  
2021 ◽  
pp. 1-8
Author(s):  
Yabin Hu ◽  
Fan Jiang ◽  
Jianguo Tan ◽  
Shijian Liu ◽  
Shenghui Li ◽  
...  
Keyword(s):  
Atopic Dermatitis ◽  
Low Temperature ◽  
Environmental Factors ◽  
Environmental Exposure ◽  
Air Pollutants ◽  
Warm Season ◽  
Cold Season ◽  
Seasonal Effects ◽  
Outpatient Visits ◽  
Increased Risk

<b><i>Background:</i></b> Childhood atopic dermatitis (AD) is an inflammatory skin disease which sometimes predisposes to allergies. Environmental factors (low humidity, irritants, etc.) are prominent causative triggers of AD. <b><i>Objectives:</i></b> This study aims to explore the effects of both meteorological factors and air pollutants on childhood AD, and the modification effects by season in Shanghai, China. <b><i>Methods:</i></b> Quasi-Poisson generalized linear regression model, combined with a distributed lag nonlinear model was used to examine the nonlinear and lagged effects of environmental factors on childhood AD from 2009 to 2017 in Shanghai. We also performed a season-stratified analysis to determine the modification effects of environmental exposure by season on childhood AD. <b><i>Results:</i></b> There were 1,043,240 outpatient visits for childhood AD in total, at 3 major pediatric hospitals. Low temperature and relative humidity (RH), and high daily temperature difference (DTD) and air pollutants (i.e., NO<sub>2</sub>) increased the relative risks (RRs) of outpatient visits for childhood AD in the whole year. In the cold season, an increased risk of outpatient visits for childhood AD was associated with low RH (RR 2.26, 95% CI 1.69–3.02) and high NO<sub>2</sub> (1.11, 95% CI 1.06–1.17). In the warm season, outpatient visits for childhood AD were associated with low temperature (3.49, 95% CI 3.22–3.77), low RH (1.89, 95% CI 1.74–2.06), high DTD (1.41, 95% CI 1.31–1.53), and high NO<sub>2</sub> (1.05, 95% CI 1.03–1.06). <b><i>Conclusions:</i></b> This study suggests that environmental exposure may be a key trigger for outpatient visits for childhood AD with apparent seasonal effects. Tailored preventive strategies to avoid environmental triggers of childhood AD should be developed.

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