Climatic changes and trends over a major river basin in India

Rao, P. Rama

doi:10.3354/cr002215

Cited by 62 publications

(28 citation statements)

References 3 publications

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“…Much research has been undertaken using the Mann-Kendall test to detect trends in climatological and hydrological time series (e.g. Rao, 1993;Kothyari and Singh, 1996;Brunetti et al, 2000;Yue and Hashino, 2003;Abdul and Burn, 2006;Jiang et al, 2007;Modarres and Silva, 2007), and this particular non-parametric test has been shown to be more powerful than some parametric tests when dealing with skewed data (Önöz and Bayazit, 2003).…”

Section: Trends In Hydrological Extremesmentioning

confidence: 99%

A characterisation of climate variability and trends in hydrological extremes in the Severn Uplands

Biggs

Atkinson

2011

Intl Journal of Climatology

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Hydrological and climatic characteristics were investigated within the Severn Uplands to determine the interconnection between variables with a focus on understanding changes in hydrological extremes. Time series of precipitation and flows over a 30-year period were analysed for trends in extremes. The Mann-Kendall (MK) nonparametric test was used to detect trends at six rain gauges and five flow gauges across the catchment. Maxima, percentiles and N-day maxima of precipitation and flow distributions were investigated to identify changes in extreme intensity, frequency and persistence, respectively. Results indicated some significant statistical trends at annual, seasonal, and monthly scales. The largest number of significant trends in extreme precipitation was identified at mountainous gauge locations where significant increases in extreme precipitation persistence were detected annually and during spring and winter. Additionally, significant increases in extreme precipitation frequency were observed annually and during autumn and winter. Trends in flow identified an increase in extreme intensity on an annual basis, as well as during winter and the month of July, and a decrease in extreme frequency at certain stations during spring. Changes in climate variables were investigated to identify causal relationships with precipitation and flow hydrological extremes. Extremes were found to coincide with certain weather types, generally characteristic of cyclonic conditions and/or orographic enhancement. These were largely correlated with strong positive and negative stages of the North Atlantic oscillation, particularly during winter. Snow cover records indicated rapid decline in the Severn Uplands and a reduction in snow indicated a link to changes in spring hydrological extremes. All changes seemed to be driven by the underlying climate variable of air temperature, which coincided with changes in observed national and global temperature records. Hydroclimatological changes indicated a possible temporal shift in the occurrence of extreme hydrological events, which was likely to have been affected by changes in catchment physical properties.

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Section: Trends In Hydrological Extremesmentioning

confidence: 99%

A characterisation of climate variability and trends in hydrological extremes in the Severn Uplands

Biggs

Atkinson

2011

Intl Journal of Climatology

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“…They also describe a decline in the number of cold days and increase in the number of extremely hot days. A fine study is performed by Rao (1993) where he chalked out significant warming trend in minimum, maximum and mean temperatures at Mahanadi river basin, India. It has also been reported that in future the temperature will rise by several degrees along with increased precipitation (Singh, 2007).…”

Section: Introductionmentioning

confidence: 99%

Climatic Variability and Linear Trend Models for the Five Major Cities of Pakistan

Sadiq¹,

Qureshi²

2010

JGG

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Estimates show that the average temperature of Earth's near surface air and oceans has raised by 0.74 ± 0.18 0 C during last 100 years. In this work the impact of the same has been explored for major urban areas of Pakistan. For this exploration long-term mean, mean-maximum and mean-minimum temperatures for the period 1961 to 2007 have been studied. The precipitation in the major cities of Pakistan, are also studied. The maximum increase in mean temperature is found to be 0.057 0 C per year (in Quetta). The minimum increase is found to be 0.019 0 C per year (in Peshawar). Both these increments are more than the global mean. An isolated discrepancy is found in mean maximum temperature of Lahore but the same can be explained in terms of heavy and prolonged monsoon rains. Moreover, precipitation in Karachi is found to be decreasing that needs to be further explored.

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“…Highly significant warming trend in the mean maximum, mean minimum and average mean temperatures of the Mahanadi river basin was reported by Rao (1993) in seven stations between 1901 and 1980. Increased maximum temperature and trendless minimum temperature, resulting in the rise in mean and diurnal range of temperature trend analyses, was reported by Rupakumar and Krishankumar (1994) for maximum and minimum temperature data derived at 121 stations in India during 1901-1987.…”

Section: Resultsmentioning

confidence: 99%

Trends in Climatic Change in the Last 50 Years at Seven Agro-climatic Regions of Tamil Nadu

Sivakumar¹,

Suraj²,

Jayashree³

2015

Climate Change Modelling, Planning and Policy for Agriculture

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The climate change issue is part of the larger challenge of sustainable development and one of the most important global environmental challenges facing humanity which go far beyond its effect on the environment. In order to understand the climatic change happening in the different agro-climatic regions of Tamil Nadu and to develop strategies to mitigate climatic stress and to optimise productivity monthly, Maximum and Minimum Temperature and Relative Humidity Data during the period 1955-2005 were obtained from the Indian Meteorological Department, Pune. From the basic temperature data, mean maximum, mean minimum and Temperature Humidity Index was computed for each month for the seven agro-climatic regions of Tamil Nadu. Mean maximum temperature was observed at the month of May, and Cauvery Delta zone showed maximum temperature of 38.22 AE 1.33 C with significant difference of P < 0.01 between the regions. Mean minimum temperature was observed at the month of January, and hilly zone showed minimum temperature of 5.59 AE 1.31 C with a significant difference of P < 0.01 between the regions. The long-term mean and annual compounded growth rates of T max , T min and THI were worked out on the basis of the representative areas selected for the study. The annual growth rate of maximum and minimum temperatures showed different patterns for different agroclimatic zones in the study area. The T max showed an increase in all the agro-climatic zones except in north-western zone and southern zone. T min also showed a positive growth pattern in all agro-climatic zones except in north-western zone and southern zone. The annual growth rate of THI showed different patterns for different agro-climatic zones. Five agroclimatic zones, viz., north-eastern zone, western zone and hilly zones, Cauvery Delta zone and high rainfall zone, were showing a positive

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Climatic changes and trends over a major river basin in India

Cited by 62 publications

References 3 publications

A characterisation of climate variability and trends in hydrological extremes in the Severn Uplands

A characterisation of climate variability and trends in hydrological extremes in the Severn Uplands

Climatic Variability and Linear Trend Models for the Five Major Cities of Pakistan

Trends in Climatic Change in the Last 50 Years at Seven Agro-climatic Regions of Tamil Nadu

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