12-14 September, 2011, Lucknow - Earth Science India

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National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow TRENDS IN THE DISTRICTWISE DROUGHT INCIDENCES OVER INDIA Latha Sridhar, D.S. Pai and Swati Gaikwad India Meteorological Department, Shivajinagar, Pune-411 005. Drought is a normal, recurrent feature of climate and is observed in all the climatic zones. However, it has significantly different characteristics from one region to another. Drought differs from aridity. Aridity is a permanent feature of climate over regions where rainfall received is generally low. On the other hand, drought over a geographic area is a temporary condition caused by significantly less (deficient) rainfall for an extended period of time, usually during a season when substantial rainfall is normally expected over the area. The deficiency in the rainfall is measured relative to the Long-Period Average (LPA) of rainfall over the area. While considering the drought, it is also important to take into account the timing (i.e. principal season of occurrence, delays in the start of the rainy season) and the effectiveness (i.e. rainfall intensity, number of rainfall events) of the rains. The severity of the drought can also be aggravated by other climatic factors such as high temperature, high wind and low humidity. A drought index is typically a single number value used for indicating severity of a drought and it is far more useful than raw data to understand the drought conditions over an area. Due to multidisciplinary importance of drought, several drought indices can be found in the literature. In this study, Standardized Precipitation Index (SPI) has been used as a drought index to examine the District-wise drought Climatology and trends in the drought incidences over India for the southwest monsoon season (June to September). SPI was computed using long time-series (1901 to 2003) of southwest monsoon season rainfall data of 458 districts over the country. It was observed that SPI is a suitable drought index for the district-wise drought monitoring over the country, as SPI was not biased by aridity. The trends in the districtwise SPI time series was computed using data of districts having data for at least 70 years. The trend analysis of district-wise SPI series showed significant decreasing trends over many districts in Uttaranchal, Kerala and in the sub-divisions from east central India such as east Madhya Pradesh, Vidarbha, Chhattisgarh, Jharkhand, Bihar etc., and significant increasing trend was observed over several districts from Konkan region, Karnataka, west Madhya Pradesh, Andhra Pradesh, Punjab and West Uttar Pradesh. Some districts of Kerala and Chattisgarh showed decreasing trends in SPI series and relatively high probability of droughts of moderate and above intensity. 78
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow DIURNAL TIDE IN THE TROPOSPHERE AND LOWER STRATOSPHERE OVER HYDERABAD, A TROPICAL STATION Salauddin Mohammad 1 , Palla Vinay Kumar 1 , Polisetty Venkateswara Rao 2 , Mulukutla Satyakumar 3 , Yeredla Karuna Reddy 3 and Gopa Dutta 1* 1 Vignana Bharathi Institute of Technology, Aushapur, Hyderabad 2 Vasavi College of Engineering, Ibrahimbagh, Hyderabad 3 India Meteorological Department, Begumpet, Hyderabad *email: gopadutta@yahoo.com This paper reports measurements of diurnal tidal oscillations in the lower atmosphere over Hyderabad, a low latitude station in the northern hemisphere. Wind and temperature data obtained through high resolution (in height) GPS radiosonde flights carried out by India Meteorological Department (IMD), Hyderabad have been used for the study. Diurnal amplitudes in both wind and temperature are observed to be quite appreciable (2 - 4.5 m/s for winds and ~2k for temperature). No clear structure can be found in the phase profiles. Amplitudes in the summer months are larger indicating contribution of non - migrating modes. TRENDS ANALYSIS OF RAINFALL SERIES IN HARYANA Darshana 1 and Ashish Pandey 2 1 Department of Water Resources Development and Management, IIT Roorkee, Roorkee-247667. 2 Department of Water Resources Development and Management, IIT Roorkee, Uttrakhand. email:darshuduhan2@gmail.com, ashisfwt@gmail.com In this study, trends analyses of rainfall series have been carried out for annual and seasonal basis for 19 districts of Haryana. The trends of rainfall series have been examined using the Mann–Kendall test and magnitude of trends using Sen’s slope estimator for the period during 1901–2010. Almost all the districts show the significant increasing trends in annual rainfall series at a significance level of 1%, 5% and 10%. The magnitude of increase in annual rainfall varied from 0.64 mm per year (Kaithal district) to 1.63 mm per year (Sirsa district). Further, significant increase was also found in annual, pre monsoon and monsoon series over entire Haryana during the period of 79
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12-14 September, 2011, Lucknow - Earth Science India

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