Article
Forestry
Chiara Proietti, Maria Francesca Fornasier, Pierre Sicard, Alessandro Anav, Elena Paoletti, Alessandra De Marco
Summary: Ground-level ozone concentrations and AOT40 metric in Europe have significantly declined due to emission control strategies, while stomatal ozone uptake by forests has increased, leading to potential ozone damage on plants. Therefore, a new biologically-sound stomatal flux-based standard is needed as a new European legislative standard in the context of climate change.
JOURNAL OF FORESTRY RESEARCH
(2021)
Article
Environmental Sciences
Tommaso Caloiero, Roberto Coscarelli, Gaetano Pellicone
Summary: This study analyzed rainfall data in the southern Italy's Calabria region and found decreasing trends in annual and winter-autumn rainfall, as well as an increasing trend in summer rainfall.
Article
Meteorology & Atmospheric Sciences
Zekai Sen
Summary: In this paper, a new trend methodology is proposed based on the characteristics of crossings along any given straight line within the given time series. It does not require any restrictive assumptions and provides a series of trends at different levels within the variation range of the time series. The methodology is compared with a classical trend determination method and applied to data from the Danube River and Turkey.
THEORETICAL AND APPLIED CLIMATOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Zulfaqar Saadi, Zaher Mundher Yaseen, Aitazaz Ahsan Farooque, Nur Athirah Mohamad, Mohd Khairul Idlan Muhammad, Zafar Iqbal
Summary: This study aims to reveal the spatio-temporal trend in extreme rainfall and temperature in Sarawak peatland due to climate change. The Modified Mann-Kendall test was used to analyze trend and confirm the impact of large scale climate events. The study provides essential insights into the behavior of different extreme climate variables and their potential impact on the peatland area susceptible to flood and fire.
WEATHER AND CLIMATE EXTREMES
(2023)
Article
Environmental Sciences
A. Bharath, Ramesh Maddamsetty, M. Manjunatha, T. Reshma
Summary: The study aims to determine the variability and trend in rainfall in Karnataka state, India. The findings reveal increased annual and seasonal rainfall in the study area, except for a significant decline during the post-monsoon season.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Xu Yang, Xueying Han
Summary: The study implemented the Mann-Kendall method to efficiently analyze trend changes in three types of time series in engineering. The results demonstrated the effectiveness of the MK method in analyzing monotonic trends in structural health monitoring.
Article
Green & Sustainable Science & Technology
Muhammad Shehzad Ashraf, Muhammad Shahid, Muhammad Waseem, Muhammad Azam, Khalil Ur Rahman
Summary: The use of hydro-climatological time series to identify patterns is crucial for understanding climate change and drought. In this study, hydrological drought variability based on the standard drought index (SDI) was investigated in the Upper Indus River Basin (UIRB) of Pakistan. The findings showed a significant decreasing trend in hydrological drought from October to March and a significant increasing trend from April to September. The IITA method was found to be reliable and effective in analyzing these trends.
Article
Environmental Sciences
Yilinuer Alifujiang, Jilili Abuduwaili, Yongxiao Ge
Summary: This study investigated the temporal patterns of river runoff data in the Lake Issyk-Kul basin in Central Asia and found various significant increasing and decreasing trends in different time series. The innovative trend analysis (ITA) method was effective in identifying these trends, compared to the Mann-Kendall (MK) trend test. The study revealed the seasonal variations in river runoff data and highlighted the importance of evaluating different values in analyzing trends.
Article
Engineering, Civil
Muhammad S. Ashraf, Ijaz Ahmad, Noor M. Khan, Fan Zhang, Ahmed Bilal, Jiali Guo
Summary: This study investigates variations in streamflow at 20 stations in the upper Indus river basin using different methods, finding that extremely low flows are increasing more significantly than extremely high flows. This may lead to constant pressure on water resources availability in the lower Indus plains where agricultural activities are dependent.
WATER RESOURCES MANAGEMENT
(2021)
Article
Environmental Sciences
Shahfahad, Mohd Waseem Naikoo, Swapan Talukdar, Tanmoy Das, Atiqur Rahman
Summary: This study examines the trend and pattern of rainfall in Mumbai city using rainfall regionalization approach. The results show that Mumbai has two homogeneous rainfall regions with distinctive rainfall patterns. The rainfall trend is positive but not monotonic. This study may contribute to the management of water resources and urban flood mitigation in Mumbai city.
Article
Water Resources
Sintayehu A. Abebe, Tianling Qin, Xin Zhang, Denghua Yan
Summary: This study focuses on determining trends in precipitation and streamflow series in the Upper Blue Nile River Basin in Ethiopia. The Discrete Wavelet Transform (DWT) and Mann-Kendall test were used to analyze the data. The results show an increasing but insignificant trend in precipitation stations, while streamflow stations exhibit a significant increasing trend. The combined use of DWT and Mann-Kendall test reveals that periodic events up to 4 years have a greater influence on the observed trends.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Meteorology & Atmospheric Sciences
Saleh H. Alhathloul, Abdul A. Khan, Ashok K. Mishra
Summary: The study found that most locations in Saudi Arabia are experiencing a significant decrease in horizontal visibility, especially in certain seasons. Some stations in the Northeast region showed the most severe visibility deterioration and exhibited multiple abrupt declines in the time series.
THEORETICAL AND APPLIED CLIMATOLOGY
(2021)
Article
Environmental Sciences
Enchuan Qiao, Chao Ma, Hao Zhang, Zhenzhen Cui, Chenglong Zhang
Summary: This study analyzed the short- and long-term radiometric trends of RadCalNet sites using bottom-of-atmosphere (BOA) data, and verified the trends revealed by the top-of-atmosphere (TOA) data from Landsat 7, 8, and Sentinel-2. The results showed significant differences between BOA and TOA reflectance, and frequent significant and abrupt changes in the radiometric trends of PICS sites. It indicates that RadCalNet remains a reliable tool for vicarious calibration, but the temporal stability should be considered for radiometric performance monitoring of sensors.
Article
Engineering, Environmental
Atul Saini, Netrananda Sahu
Summary: The study analyzed the long-term monsoon rainfall trend in India and found specific regions with monotonic trends, but no significant monotonic trend was found for India as a whole. Utilizing multiple methods of analysis, it was discovered that the Northeast and Central Northeast regions have a monotonic rainfall trend.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2021)
Article
Environmental Sciences
Mohammad Arab Amiri, Milan Gocic
Summary: The analysis using the ITA method and the Mann-Kendall test on the historical precipitation changes in Serbia from 1946-2019 showed that the southwestern part of the country has the greatest increasing trend, with a noticeable gradient in precipitation trend from east to west. The ITA method was found to be more sensitive in detecting hidden trends compared to the MK trend test.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Astronomy & Astrophysics
Surajit Chattopadhyay
Summary: The study investigates the bouncing cosmology in f(T) gravity with holographic Ricci density, specifically rho(lambda)=3 xi(2)(H+2H(2)). Two forms of scale factor, exponential and power-law, are considered to reconstruct f(T) gravity and derive expressions for the equation of state parameter in the bouncing scenario. The reconstructed equation of state parameter for the exponential scale factor exhibits a symmetric pattern around the turnaround or bouncing point. Stability of the models is examined through the squared speed of sound and is shown to depend on the value of xi.
ASTRONOMISCHE NACHRICHTEN
(2023)
Article
Physics, Mathematical
Gargee Chakraborty, Aroonkumar Beesham, Surajit Chattopadhyay
Summary: Motivated by Nojiri and Odintsov's work, this study reports on the cosmology and baryogenesis of modified f(G) gravity by assuming the background evolution as generalized holographic dark energy (GHDE). The reconstruction of modified f(G) gravity in GHDE shows positive behavior and the corresponding equation of state parameter is phantom-like. There is a possibility of a big rip singularity and the slow roll parameters are analyzed. Quasi-exponential expansion and warm inflation are observed. Finally, baryogenesis is studied, suggesting a symmetry between the number density of baryons and antibaryons in the far future or the satisfaction of the generalized second law of thermodynamics by the model.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Gargee Chakraborty, Surajit Chattopadhyay
Summary: Motivated by previous works, this study presents reconstruction schemes for the inhomogeneous equation of state (EoS) and cosmology in the scenario of coupled fluid. Viscosity is considered in an interacting system using the Eckart approach. The EoS parameters for different cosmologies (Little Rip, Pseudo Rip, and Bounce) are rebuilt for both viscous and nonviscous systems, revealing interesting properties such as phantom behavior and violation of energy conditions.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2023)
Article
Astronomy & Astrophysics
Khandro K. Chokyi, Surajit Chattopadhyay
Summary: The study focuses on the realization of bounce using a truncated scale factor and holographic Ricci Dark Energy. The researchers investigated the behavior of the scale factor and found a suitable form that satisfies the conditions for bounce realization. However, the resulting equation of state parameter violates the required energy condition. The bounce scenario was also studied in a modified gravity framework.
ASTRONOMISCHE NACHRICHTEN
(2023)
Article
Astronomy & Astrophysics
Sanjeeda Sultana, Surajit Chattopadhyay
Summary: This paper presents a detailed study of the generalized Chaplygin gas (GCG) in both interacting and non-interacting scenarios, using different forms of the scale factor. The equation of state (EoS) parameter is analyzed, showing quintessence behavior in the non-interacting case and phantom behavior in the interacting case. The cosmological effects of GCG interacting with pressureless dark matter in the framework of f(T) modified gravity are investigated, and the stability and consistency with observational constraints are examined.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Sanghati Saha, Surajit Chattopadhyay
Summary: In this study, we investigated bouncing cosmology with modified generalized Chaplygin gas (mgCG) within a bulk viscosity framework. Reconstruction schemes were demonstrated for both Einstein and modified f(T) gravity frameworks, considering both viscous and non-viscous cosmological settings. The equation of state (EoS) parameter and stability of the models were analyzed, indicating that the mgCG behaves like avoidance of Big Rip in the presence of bulk viscosity and exhibits a phantom-like behavior in non-viscous cases. The mgCG's model parameters and the dynamics of the Hubble flow were studied, revealing its capability of realizing an inflationary phase and an exit from inflation. The reconstructed mgCG was found to be stable against small perturbations, regardless of the presence of bulk viscosity and modified gravity scenario. Lastly, the reconstruction scheme was assessed using statistical analysis, Shannon entropy.
Article
Mathematics, Applied
Samprity Das, Irina Radinschi, Surajit Chattopadhyay
Summary: This paper presents a study on neutron stars in the f(R) gravity framework using various models such as the Hu-Sawicki model, Starobinsky model, Tsujikawa model, and Exponential Gravity model. The authors obtained higher order differential equations for the functions ? and ? using the TOV equation. They also introduced a new scalar field f(2) with a scalar potential V(f2) in the BD theory. The results showed an increase in the scalar potential with respect to R in all cases, and similar evolution patterns were observed for the proposed models.
Article
Mathematics, Applied
Rashmi Rekha Devi, Surajit Chattopadhyay
Summary: This paper presents a study on interpreting surface temperature using time series and fuzzy measures. The authors propose a method to address the uncertainty surrounding surface temperature data related to the summer monsoon in India. By standardizing random variables and applying the Dempster-Shafer Theory, common goals are generated using fuzzy numbers as criteria. Through the construction of polynomials, a functional relationship between time series and joint belief measures is illustrated. The analysis of results suggests an increase in certainty over time, highlighting the predictability of evidence strength over an extended period.
Article
Astronomy & Astrophysics
Rajat Kanti Chatterjee, Sanjeeda Sultana, Surajit Chattopadhyay
Summary: This paper studies the DBI essence scalar field model of dark energy interacting with pressureless dark matter in the presence of bulk viscous pressure. The quintom behavior of the equation of state is observed.
Article
Chemistry, Physical
Sanjeeda Sultana, Ertan Gudekli, Surajit Chattopadhyay
Summary: In this paper, we analyzed the properties of generalized Chaplygin gas (GCG) and modified generalized Chaplygin gas (MGCG) in an interacting scenario. We studied the equation of state parameter and stability of the models through squared speed of sound. Our findings showed that both GCG and MGCG, when interacting with pressureless dark matter, exhibit stability against gravitational perturbations. Furthermore, we tested the validity of the generalized second law (GSL) of thermodynamics for different enveloping horizons and found that GSL holds throughout. Additionally, we reconstructed f(T) gravity using GCG and MGCG, and observed phantom behavior through the reconstructed EoS parameters. We derived the squared speed of sound for f(T) gravity and established the stability of the model through its positivity.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2023)
Article
Physics, Multidisciplinary
Rashmi Rekha Devi, Surajit Chattopadhyay
Summary: This study presents a binary fuzzy relation (BFR) based approach to analyze rainfall behavior in northeast India. The results show the relative importance of seasonal rainfall in the annual rainfall, with pre-monsoon rainfall having a moderate influence and a stronger influence when combined with summer monsoon rainfall.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Remote Sensing
Rashmi Rekha Devi, Soumya Banerjee, Surajit Chattopadhyay
Summary: In this study, the total ozone time series in a metropolis in India was examined. The data was obtained through a Brewer spectrophotometer, and the uncertainty of the total ozone time series was thoroughly examined using the Dempster-Shafer method. The association was depicted using three-dimensional graphs, and the prediction capability of the single layer Long Short-Term Memory model was demonstrated using the Adam Optimisation Algorithm and the Rectified Linear Unit.
REMOTE SENSING LETTERS
(2023)
Article
Multidisciplinary Sciences
Sanghati Saha, Ertan Guedekli, Surajit Chattopadhyay
Summary: The study examines the realization of cosmic bounce in two situations with different scale factor selections, one of which is already developed and the other is created by truncating a series expansion. The background fluid in both situations is assumed to be Generalized Chaplygin gas (GCG). The study shows that the GCG energy density decreases during contraction, reaches its lowest point at the bounce, and then increases during expansion. However, the truncation has an impact on the density evolution in the other scale factor scenario.
Article
Geochemistry & Geophysics
Rashmi Rekha Devi, Surajit Chattopadhyay
Summary: Using MF-DFA, this study examined the pre-monsoon rainfall and Indian summer monsoon rainfall in northeast India, and found that both exhibit multifractal behavior.
DYNAMICS OF ATMOSPHERES AND OCEANS
(2023)
Article
Physics, Multidisciplinary
R. R. Devi, P. Bhuiya, S. Chattopadhyay
Summary: This study presents a detailed analysis of rainfall patterns in the Eastern Peninsula region of India using Markov chain analysis. The findings suggest that the overall pattern of annual rainfall is influenced by the Indian summer monsoon rainfall, and the post-monsoon season has minimal impact. Additionally, a rescaled range analysis reveals a long-term switching between high and low values of rainfall, indicating a lack of strong long-term autocorrelation.
INDIAN JOURNAL OF PHYSICS
(2023)
