1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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    Influence of Indian ocean on structure and variability of monsoon low level jet in the present and future climate perspectives
    (College of climate change and environmental science, Vellanikkara, 2023-11-30) Neha Johnson.; Ruchith , R D
    The Monsoon Low-Level Jet (MLLJ) is a crucial synoptic feature of the Indian summer monsoon, responsible for a significant portion of moisture transport to the Indian subcontinent. The present study focuses on analyzing the variability and vertical structure of the Monsoon Low-Level Jet (MLLJ) during the Southwest Monsoon season from 1979 to 2022. To conduct in-depth analysis, the total MLLJ path was divided into five regions: the Southern Indian Ocean, Equatorial Indian Ocean, Arabian Sea, Indian subcontinent, and the Bay of Bengal. The mean jet core height for these selected regions was found to be 588.84 ± 37.81, 874 ± 16.9, 849.62 ± 24.11, 830 ±39.85, 832 ± 41.25 and mean jet speed were found to be 2.96 ± 2.78, 10.49 ± 1.07, 15.79 ± 3.1, 11.43 ± 3.4 and 9.857 ± 3.09 respectively. Monthly variation in the jet properties were also analysed. To consider the impact of global warming on MLLJ characteristics, the analysis was conducted by dividing the study period into two epochs: pre-20 (1979 – 2000) and post-20 (2001 – 2022). The properties of the jet exhibit remarkable differences between these two epochs. Trend analysis also indicates a significant change between these epochs. Jet properties show robust interconnections with sub-seasonal ocean processes, including Somali, Oman, and South Eastern Arabian Sea upwellings in the Indian Ocean. The Arabian Sea Mini Warm Pool exhibits a significant correlation with jet properties, especially Arabian Sea core height.Extensive research was conducted to deeply investigate the pivotal influence of MLLJ characteristics on cloud and precipitation processes. The association of Convective Available Potential Energy (CAPE) and convective precipitation with core height exhibited similarities in the Arabian Sea (AS) and Indian subcontinent (IS) regions, while the Bay of Bengal (BB) region displayed notable differences. The Jet speed exhibits same pattern. In the study, MLLJ characteristics were examined in relation to ocean-atmospheric processes, including the IOD, ENSO, and SIOD indices, with a focus on notable variations in the SIOD index. The MLLJ characteristics also correlate with Indian summer rainfall, showing significant relationships. To assess future prospects, historical (1850-2014) and projection (2015-2096) data from IITM ESM were analyzed in conjunction with jet properties.
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    Influence of weather parameters on yield of coconut
    (Department of Statistics, College of Veterinary & Animal Sciences, Mannuthy, 1985) Pankajakshan Nair, B; Gopinathan Unnithan, V K
    Influence of eighteen climatic factors for a period ranging from 10-45 months before harvest of coconut, were studied on monthly and annual coconut yield. Monthly climatic factors showed a seasonal relationship with monthly yield changing sign alternatively. Month-wise and season-wise climate and their influence on monthly and annual yield was also studied. The influence of climatic factors were more in evidence during pre and post monsoon seasons. RH, SSH and EV are frequently showed significant relationship with monthly yield than the rest. Seasonal grouping of climate showed stronger relationship on annual yield than month-wise climate. May, September, October and December months of yester years showed explicit association with annual yield.
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    Forecasting of rice yield using climatological variables
    (Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1986) Ajitha, T K; Prabhakaran, P V
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    Control of cashew stem borer (Plocaederus ferrugineus L.) by the DD. 136 nematode (Nevaplectana earpocapsae Weiser 1955)
    (Department of Agricultural Entomology, College of Horticulture, Vellanikkara, 1989) Madhu, S; Venkitesan, T S