Long-term changes in climatic variables over the Bharathapuzha river basin, Kerala, India

George, Jose; Athira, P.

doi:10.1007/s00704-020-03255-8

Cited by 21 publications

(7 citation statements)

References 60 publications

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“…The study mentioned a global climatic shift that occurred in 1976/77, which they used as a reference point for splitting the time series into two periods. George and Athira [61] reported a significant change in the climatic pattern in the Bharathapuzha river basin (which covers three districts) in Kerala after the 1980s. They identified 1980 as a significant change point in the rainfall time series data.…”

Section: Long-term Temperature Trend and The Year Of Abrupt Shiftmentioning

confidence: 99%

Climate Dynamics over Kerala, India: Insight from a Century-long Temperature and Rainfall Data Analysis

Jamaludheen A.,

Kumar,

Singh

et al. 2024

Int. J.Environ. Clim. Change.

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Historical climate data analysis is of great significance in climate change adaptation and mitigation planning at global as well as regional levels. This article attempted to study the long-term trends of temperature and rainfall across the districts in Kerala, India. CRU monthly time series data of rainfall and temperature data spanning from 1901-2022 were used for the analysis. Mann-Kendall test and Sen’s Slop estimator were applied to detect the presence and magnitude of the trend, and Pettitt’s homogeneity test was used to find the climate change point in temperature time series data. The analysis found a significant and positive temperature trend across all districts in Kerala, with temperature increases ranging from 0.0086°C/year to 0.0102°C/year. In terms of rainfall trends, June and January experienced a significant decrease, while July and September saw a significant increase over the years. The year 1976 was identified as the point of climate change. It was observed that there was an increase in the southwest and Northeast monsoons in the post-period, with higher variability in the latter. Winter rainfall notably decreased during the post-period. The variability in climate parameters identified in this study could impact crop cycles and agricultural productivity, requiring further investigation at a micro-level for effective adaptation and mitigation strategies for the state.

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Section: Long-term Temperature Trend and The Year Of Abrupt Shiftmentioning

confidence: 99%

Climate Dynamics over Kerala, India: Insight from a Century-long Temperature and Rainfall Data Analysis

Jamaludheen A.,

Kumar,

Singh

et al. 2024

Int. J.Environ. Clim. Change.

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“…Detecting and quantifying trends in climate variables are essential for assessing the impact of natural changes. Many studies have analyzed trend of changes in rainfall and temperature in climate variables 1,3,49 . The climate parameters analysed include annual average temperature, annual evaporation, and annual rainfall.…”

Section: Analysis Of Climate Changementioning

confidence: 99%

Investigation of main parameters causing decline in water level of Lake Toba during last six decades

Rosid,

Irwandi,

et al. 2023

Preprint

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Lake Toba’s water level has declined in the last six decades. Hence, a comprehensive study has been conducted, which is expected to explain the leading causes of Lake Toba's water level decline. The Lake Toba water level discussion is divided into two periods, Period I (1957–1978) and Period II (1981–2020), before and after Siruar Dam’s operation. Climate change and human activities have become significant concerns. Trend tests, quantile mapping bias correction, and water balance were used in this study. The result of the trend test is an increasing trend of rainfall and temperature, while evaporation demonstrates a decreasing trend. In addition, there has been a rising trend in the consumption of lake water for domestic and non-domestic needs, agricultural irrigation, and industrial use. Significant changes in land use have also occurred, especially the decline in dryland forests and an increase in industrial forests, settlements, and dryland agriculture. In Period I, the dominant cause of the water level decrease in Lake Toba was climate. In contrast, the leading cause in Period II was human activities such as the water needs of hydroelectric power plants.

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“…Detection and quantification of trends in climate variables is an important step for impact assessment and climate change projections 35 – 37 . Trend analysis can be carried out using the parametric method with the assumption that the data are normal, while for independent data sets that have outliers, it can be solved using non-parametric methods 38 – 42 . The Mann–Kendall (MK) trend test is used to determine the trend (positive or negative) 43 , 44 while the Sen slope estimator (SSE) 45 is used to determine the rate value of the trend in climate variables 46 , 47 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Climate change on temperature and precipitation in the Lake Toba region, Indonesia, based on ERA5-land data with quantile mapping bias correction

Irwandi

Rosid

Mart

2023

Sci Rep

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Climate change is a serious problem that can cause global variations in temperature and rainfall patterns. This global variation can affect the water availability of lakes. In this study, trends in temperature and rainfall in the Lake Toba area for 40 years (1981–2020) were analyzed using ERA5-Land data corrected with observation station data utilizing the quantile mapping bias correction method. Corrected ERA5-Land data were used in this study to show spatial patterns and trends. The Mann–Kendall and Sen slope tests were carried out to see the magnitude of the trend. A comparison of temperature and rainfall against their baseline period (1951–1980) was also investigated. The results of this study show that climate change has affected the trend of increasing temperature and rainfall in the Lake Toba area, with an increase in temperature of 0.006 °C per year and an average rainfall of 0.71 mm per year. In general, significant changes in the increase of temperature and rainfall occurred in the last decade, with an increase in temperature of 0.24 °C and rainfall of 22%. The study of the impact of climate change expected to be useful for policymakers in managing water resources in the Lake Toba area.

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Long-term changes in climatic variables over the Bharathapuzha river basin, Kerala, India

Cited by 21 publications

References 60 publications

Climate Dynamics over Kerala, India: Insight from a Century-long Temperature and Rainfall Data Analysis

Climate Dynamics over Kerala, India: Insight from a Century-long Temperature and Rainfall Data Analysis

Investigation of main parameters causing decline in water level of Lake Toba during last six decades

Effects of Climate change on temperature and precipitation in the Lake Toba region, Indonesia, based on ERA5-land data with quantile mapping bias correction

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