New combined models for estimating daily global solar radiation based on sunshine duration in humid regions: A case study in South China

Fan, Junliang; Wang, Xiukang; Wu, Lifeng; Zhang, Fucang; Bai, Hua; Lu, Xianghui; Xiang, Youzhen

doi:10.1016/j.enconman.2017.11.085

Cited by 130 publications

(42 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, reducing the irrigation frequency and increasing the single irrigation amount can easily lead to the accumulation of NO 3 -N in the underlying soil, increasing the risk of NO 3 -N leaching and the potential risk of groundwater pollution. According to the analysis conducted in this study, an appropriate irrigation amount and irrigation frequency (W M F 4 treatment) are conducive to promoting the absorption of water and nutrients by crop roots, leaving minimal residual soil nitrate and NO 3 -N. Greenhouse is an important facility for the vegetable production around the world due to its high-efficient use of solar radiation resources [59][60][61]. In summary, moderate irrigation amounts and frequency (W M F 4 treatment) are conducive to promoting the normal growth and development of mini Chinese cabbages, effectively improving the yield, WUE and quality, as well as significantly reducing the soil residual NO 3 -N content, which is conducive to the sustainable use of greenhouse soil.…”

Section: Irrigation Levels and Irrigation Frequencies Adjust The Soilmentioning

confidence: 97%

Effect of Irrigation Level and Irrigation Frequency on the Growth of Mini Chinese Cabbage and Residual Soil Nitrate Nitrogen

et al. 2018

Self Cite

View full text Add to dashboard Cite

: Nitrogen (N) fertilizer is known to improve the quality and biomass of vegetables, but it is unclear how to manage the large amount of NO3-N that accumulates in the soil after vegetable harvest. In this study, we examined the influence of irrigation level and irrigation frequency on the growth and soil residual NO3-N of the catch crop mini Chinese cabbage (Brassica pekinensis) in a greenhouse. Using conventional border irrigation with adequate water supply as a control (CK), three irrigation levels (WH: 160% crop evapotranspiration (ETc), WM: 120% ETc and WL: 80% ETc) and three irrigation frequencies (intervals of F2: 2 days, F4: 4 days, and F8: 8 days) were assessed in 2014, 2015 and 2016 in northwest China. The results showed that the weight of the leaves and leaf stalks was the primary determinant of yield, and that these are the primary N-containing vegetative organs of the plants. At the same irrigation level, the total N content of the plants increased in the order F8 < F2 < F4. The trend in the total N content in the mini Chinese cabbage plants among different treatments was synchronized with the yield. The highest total N content in the plants was observed in the WMF4 treatment during all three years. The three-year averages of mini Chinese cabbage aboveground biomass, yield and water use efficiency (WUE) in the WMF4 treatment were 60%, 64.5% and 119.2% higher respectively than in the CK treatment. The residual NO3-N content in the soil in the WMF4 treatment was only 1.3% higher than that in the CK treatment. The total N uptake in the WMF4 treatment was 79.2% higher than that in the CK treatment, and the N loss in the WMF4 treatment was 46.3% lower than that in the CK treatment. Under these experimental conditions, the WMF4 treatment can be recommended as an appropriate irrigation regime for mini Chinese cabbage under fallow greenhouse management in northwest China.

show abstract

Section: Irrigation Levels and Irrigation Frequencies Adjust The Soilmentioning

confidence: 97%

Effect of Irrigation Level and Irrigation Frequency on the Growth of Mini Chinese Cabbage and Residual Soil Nitrate Nitrogen

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Liu et al () used observation data from 15 radiation stations to validate different empirical estimation methods over the Tibetan Plateau and improved the Ångström‐type model using altitude and water vapor pressure as the leading factors. Fan et al () developed four new combined sunshine‐based models, two of which used temperature and precipitation to estimate daily horizontal global Rs in south China. These studies showed that A‐P model parameters are influenced by geographical and meteorological factors, such as cloudiness and altitude, and vary greatly between different regions.…”

Section: Introductionmentioning

confidence: 99%

Determining the Parameters of the Ångström‐Prescott Model for Estimating Solar Radiation in Different Regions of China: Calibration and Modeling

Liu

Tan

Pan

2019

Earth and Space Science

View full text Add to dashboard Cite

The Ångström‐Prescott model (referred to as the A‐P model) is one of the most accurate and widely used models for estimating global solar radiation (Rs). In the absence of Rs measurements and given the regional discrepancy of model parameters, it is crucial to increase the availability of these parameters and the applicability of parameter‐predicted models in different regions. In this study, we evaluated and compared the applicability and performance of the calibrated model and eight predictive models in terms of A‐P model parameters, using daily Rs and meteorological data from 105 radiation stations in seven natural geographic zones in China. These models were evaluated based on their coefficient of determination (R2), root mean square error, Nash‐Sutcliffe efficiency coefficients, percent bias, and global performance indexes. Results indicated that altitude was the main factor determining the Ångström‐Prescott parameters in most regions. All models performed well, with acceptable accuracy across the whole country; however, their performances varied among regions. The best performing predictive models for the northeast region (Zone 1), north China (Zone 2), central China (Zone 3), south China (Zone 4), Inner Mongolia (Zone 5), northwest region (Zone 6), and Qinghai‐Tibet region (Zone 7) were obtained: These were Models 6, 1, 7, 3, 6, 1, and 7, respectively. The present results support the application of these predictive models for the estimation of daily global Rs in the corresponding regions of China, where measured Rs data are not available, and possibly in other regions with a similar climate.

show abstract

“…In this group, sunshine duration, temperatures and precipitation were incorporated with clearness index for estimation of solar radiation in the forms of linear [20,46], quadratic and cubic [99] and hybird [45] functions. 3.9 Group 9: sunshine duration -temperature -pressure (STPr) models In this group, clearness index or solar radiation was correlated with the combinations of sunshine duration, temperature and pressure in the forms of linear [20], power [54] and hybrid [44] functions.…”

Section: Group 8: Sunshine Duration -Temperature -Precipitation (Stp)mentioning

confidence: 99%

“…Chen and Li [20] modified the A-P model using precipitation. Fan et al [45] introduced the combination of air temperature and precipitation to the A-P model. Okonkwo and Nwokoye [46] modified the A-P model using air temperature, relative humidity and precipitation.…”

Section: Introductionmentioning

confidence: 99%

Empirical models for estimating monthly global solar radiation: A most comprehensive review and comparative case study in China

Chen

He²,

Yang

et al. 2019

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

Global solar radiation is a core component of scientific research and engineering application across a broad spectrum. However, its measurement is limited by a small number of observation stations due to the technical and financial restricts. Estimating solar radiation with the meteorological variables using empirical models is of benefit to obtain solar radiation data at global scale. Yet, there are various options of available empirical models to select the most suitable one. This study conducted a most comprehensive collection and review of empirical models employing the commonly measured meteorological variables and geographic factors. A total of 294 different types of empirical models were collected and classified into 37 groups according to input attributes. Such collection built an empirical model library providing an overall overview of the developed emperical models in literatures. Furthermore, the collected models were calibrated and evaluated at three meteorological stations in the Three Gorges Reservoir area in China. This study suggests that these model-comparing processes can assist the governments, scientists and engineers in tailoring the most fitted model for specific applications and in particular areas.

show abstract

New combined models for estimating daily global solar radiation based on sunshine duration in humid regions: A case study in South China

Cited by 130 publications

References 33 publications

Effect of Irrigation Level and Irrigation Frequency on the Growth of Mini Chinese Cabbage and Residual Soil Nitrate Nitrogen

Effect of Irrigation Level and Irrigation Frequency on the Growth of Mini Chinese Cabbage and Residual Soil Nitrate Nitrogen

Determining the Parameters of the Ångström‐Prescott Model for Estimating Solar Radiation in Different Regions of China: Calibration and Modeling

Empirical models for estimating monthly global solar radiation: A most comprehensive review and comparative case study in China

Contact Info

Product

Resources

About