The trend of natural illuminance levels in 14 Chinese cities in the past 50 years

He, Yansong; Wang, Aiying; Huang, Haijing

doi:10.1186/2192-0567-3-22

Cited by 11 publications

(15 citation statements)

References 13 publications

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“…Given the significance level of and confidence interval |UF /2|, if the lines UF k and UB k cross the confidence interval, the intersection point is the mutation of the series (He et al, 2013).…”

Section: The Mk Mutation Analysismentioning

confidence: 99%

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Variation of the proportion of precipitation occurring as snow in the Tian Shan Mountains, China

Guo

2014

Int. J. Climatol.

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Snowfall in mountainous areas provides indispensable water sources for arid and semi-arid watersheds. Changes in snowfall and snowmelt regimes have significantly impacted the water resources' variations and management. This study addresses the ratio of snowfall to precipitation (S/P) in the Tian Shan Mountains, China. It aims to examine changes in S/P ratio and its synchronization with climate change. The results show that the average S/P ratio experienced a downward trend under the precipitation and snowfall increases as well as temperature increases during the cold seasons in 1961-2010. Spatially, the S/P ratios show an increasing trend in the Boertala Valley and the southern slope of the middle Tian Shan Mountains, but a decreasing trend in Yili Valley, and the western and the northern slope of the middle Tian Shan Mountains. The S/P ratios decreased significantly in middle altitudes with elevation ranging from 1500 to 2500 m, but either decreased or increased at elevations below 1500 m due to a temperature inversion in the elevation belt. In high altitudes with elevation over 3500 m, the magnitudes of the decreased S/P ratios were small because the temperature was always below freezing. The decreases in S/P ratio was mainly attributed to the relative changes in snowfall (dS/S) being less than that in precipitation (dP/P), whereas the increases in S/P ratio resulted from the relative changes in snowfall (dS/S) being more than that in precipitation (dP/P). Temperature increases have also lead to the decreases in S/P ratios to some extent.

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Section: The Mk Mutation Analysismentioning

confidence: 99%

“…The MK mutation method (Wei, 1999;He et al, 2013) was used to determine the aberrance of the data series {x i }. The rank series of x i was defined as:…”

Section: The Mk Mutation Analysismentioning

confidence: 99%

Variation of the proportion of precipitation occurring as snow in the Tian Shan Mountains, China

Guo

2014

Int. J. Climatol.

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“…Over the last decade, research into the catalytic HDO of SA has mainly involved the use of metals in a reduced state (Pt, Pd, Co, Ru, Ni) or of bimetallic sulfides (NiMoS 2 , CoMoS 2 ) on various supports . However, the corrosiveness of sulfur‐containing catalysts had led to attention being focused on the use of Ni‐ and Pd‐containing catalysts.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Nitrides, Carbides and Phosphides as Highly Efficient Catalysts for the (hydro)Deoxygenation Reaction

et al. 2019

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Transition metal nitrides, carbides and phosphides have the potential to replace the expensive and hazardous catalysts typically used for the conversion of fatty acids. However, there has been little research on the influence of treatment conditions and precursor nature on the properties of such catalytic systems. To better understand these dependencies, we synthesized a number of Mo catalysts by temperature‐programmed reduction (700‐900 °C; CH4/N2, N2/H2) using ammonium heptamolybdate, diammonium phosphate and hexamethylenetetramine (HMT) as Mo, C, N and P sources. The presence of HMT in the precursor mixtures ensured the synthesis of pure phase Mo2C, Mo2N and MoP. Catalytic activity in the (hydro)deoxygenation of stearic acid (240 min; 360 °C; 50 bar of H2) decreased in the following order: Mo2C>Mo2N>MoP. However, all of the studied Mo‐based catalysts showed good deoxygenation efficiency and, thus, represent excellent alternatives to traditional noble and sulfur‐containing catalysts.

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“…Apart from trend analysis, the MK mutation test (Yue and Wang, ; Hamed, ; He et al , ) was used to investigate whether there is a mutation in the observed time series of these temperature indices and when the mutation (if any) occurred. Specifically, it is assumed that an original time series is expressed as ( y 1 , y 2 , … , y n ).…”

Section: Methodsmentioning

confidence: 99%

Observed changes in temperature extremes for the Beijing–Tianjin–Hebei region of China

Yao

Huang

Wang

et al. 2017

Meteorological Applications

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As one of the most significant threats facing the world, climate change has already been manifested everywhere in the form of frequent extreme climate events (e.g. heat waves, floods, droughts and wildfires) and has caused serious impacts on all aspects of the living environment. Due to the regional variability of global climate change, understanding the ongoing climatic changes at a local scale is very important for decision makers and resource managers to develop appropriate mitigation and adaptation strategies against the changing climate. In this study, recent changes in extreme temperature indices (including frost days, summer days, icy days, tropical nights, growing season length, cool nights and warm nights, cool days and warm days, and daily temperature range) over the Beijing-Tianjin-Hebei (BTH) region of China were investigated in the context of global warming. The results indicate that the historical trends of these extreme temperature indices are statistically significant in Huailai, Beijing, Leting and Shijiazhuang while no significant trends are reported in Chengde, Tianjin and Cangzhou−Potou. By comparing results between coastal and inland stations, it is found that the changes in temperature extremes in inland stations are less significant than the changes in coastal stations. The results also suggest that the indices based on minimum temperature show decreasing trends while those for maximum temperature present increasing trends. Furthermore, mutation tests were performed for all indices in order to understand when the changes were initiated. An apparent mutation point (mostly in the 1980s) is detected for most of the analysed temperature indices. This may be caused by the wide implementation of the reform and opening policy in the early 1980s to boost economic development in the BTH region.

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The trend of natural illuminance levels in 14 Chinese cities in the past 50 years

Cited by 11 publications

References 13 publications

Variation of the proportion of precipitation occurring as snow in the Tian Shan Mountains, China

Variation of the proportion of precipitation occurring as snow in the Tian Shan Mountains, China

Molybdenum Nitrides, Carbides and Phosphides as Highly Efficient Catalysts for the (hydro)Deoxygenation Reaction

Observed changes in temperature extremes for the Beijing–Tianjin–Hebei region of China

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