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RISS 인기검색어
- 검색키워드
- 저자 : N. Naveena (검색결과 2 건)
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Prediction of Heatwave 2013 over Andhra Pradesh and Telangana, India using WRF Model
N. Naveena,G. Ch. Satyanarayana,A. Dharma Raju,N. Umakanth,D. Srinivas,K. Sivasankar Rao,M. Suman 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.3
Heatwaves are acknowledged to be the major meteorological disaster, causing a noticeable impact on humans and animals’ lives during the last few decades. The number, frequency, duration, intensity, and areal extent of the heatwaves are on the rise during recent years. The Maximum temperature data of 2013 is analyzed to assess the synoptic nature, intensity, frequency, and various significant facets of the heatwave over the south peninsular states of Andhra Pradesh and Telangana. Indian subcontinent experienced a major heatwave during 2013, which claimed 1216 human lives. Even though the highest intensity of maximum temperatures is observed in May over major areas of India, the increasing (incidence, duration, number of spells, and the sweltering temperatures) number of heatwaves are observed over many parts of the country. The northwest and southeast coastal regions are the two heat wave prone regions. The advection of heat from the northwest with the aid of north-westerly winds causes heatwaves over northwest India to sweep or move towards India’s southeast and east coast. The heatwave record over south-eastern India, i.e, Andhra Pradesh and the adjoining Telangana state during May 22-24, 2013 were described in this study. Maximum temperatures above 40°C are observed with a sudden rise by 6 to 7°C over the study region. An attempt is made to predict the maximum temperatures 72 hours before the existence of a heatwave at 3 km horizontal resolution using the Advanced core of the Weather Research and Forecasting (WRF) model. Model predicted temperature values match with observations and the statistical metrics show a high index of the agreement, lower values for root-mean-square error and mean absolute error. Atmospheric circulation patterns associated with this heatwave are also presented. The arrest of sea breeze, the hovering of diabatic heat because of subsidence is the factor that abetted the heatwave blockade over the south-eastern part of the country. The WRF model forecasts could present the occurance of the heat wave over AP and Telangana region with 72 hour lead time with high accuracy.
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C.M. Kalleshwaraswamy,S.K. Adarsha,N.L. Naveena,Sharanabasappa 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.1
White grub, Leucopholis lepidophora Blanchard (Coleoptera: Scarabaeidae: Melolonthinae), is a major insect pest infesting areca nut in India. Larvae feed on roots (hence also called root grubs), causing reduced number of roots, loss of anchorage, stem tapering, reduced number of fronds, yellowing of leaves, yield reduction and death of the plants. The biology and ecology aspect of this scarabaeid are scanty. Hence, the aim of this study was to understand the ecological and behavioral aspects to develop IPM program. The adult emergence pattern of L. lepidophora was observed daily during the rainy season. The emergence period was defined between June and October during 2013 and 2014. Peak emergence of adult beetles occurred between 1900 and 2000 h. When raining occurred between 1800 and 2100 h, no emergence of adult beetles was observed. The sex ratio of L. lepidophora varied over time, but the overall sex ratio was female biased in both the study years (female:male; 1:1.18 and 1:1.46 in 2013 and 2014, respectively). Males were found to emerge first in the season resulting in protandry. Innovative idea emerged during our field experiments in 2013–2014 was the use of female beetles for attracting male beetles. Female adults were collected and placed individually in traps made of small pouches of nylon net and were tied to the areca palm at a height of 5 ft. Trap containing a female beetle attracted male individuals for about 8–10 days. The same technique was employed for the large-scale collection of beetles during 2014. A total of 1843 males were collected in an areca grower's field using female-baited traps during 2014. Male baited traps did not attract female beetles, indicating existence of only female produced semiochemical that attracts males. Our findings provide new insights for incorporating adult collection using female- baited traps in IPM against areca nut white grubs.
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