scholarly journals On the determination of the structure and refractive index of the lower troposphere (lowest 1000 ft) over Dum Dam Airport

MAUSAM ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 399-408
Author(s):  
A. C. DE
Keyword(s):  
Refractive Index ◽  
Mass Concentration ◽  
Monsoon Season ◽  
Meteorological Data ◽  
Winter Season ◽  
Lower Troposphere ◽  
Masking Effect ◽  
Tabular Form ◽  
Water Droplets

The results of special radiosonde soundings extending upto 1000 ft made on certain selected dates and at certain selected hours during the winter season 1957-58 and pre-monsoon season 1958 over Dum Dum airport are discussed. The results indicated the formation of ducts at certain hours. The variations of the meteorological data with the progress of night are shown in a tabular form. The radarscope observations at the corresponding hours are also discussed. On some occasions the duet heights were as high as 600 ft and prevailed for the whole night. These duets extended horizontally in all directions to about 50 miles. The attenuation produced by appearance of fog/mist over the station and its masking effect on the ground clutters are also discussed. The mass concentration of water droplets on different dates has been calculated and shown in a tabular form.

scholarly journals Sensitivity analysis of WOFOST for yield simulation of cassava over the major growing areas of India

2021 ◽  
Vol 23 (4) ◽  
pp. 375-380
Author(s):  
RAJI PUSHPALATHA ◽  
GOVINDAN KUTTY ◽  
BYJU GANGADHARAN
Keyword(s):  
Crop Production ◽  
Monsoon Season ◽  
Meteorological Data ◽  
Winter Season ◽  
Northeast India ◽  
Crop Model ◽  
Significant Trend ◽  
Maximum Temperature ◽  
Yield Variation ◽  
Cassava Production

A study was conducted to assess the meteorological sensitivity of the WOFOST crop model in simulating the yield of cassava. The sensitivity was designed by changing the present meteorological data by ±1 to ±5 %. The results has shown the minimum temperature influencing the yield of cassava (variation: 4.94 to -7.65 %) followed by the maximum temperature (yield variation: 6.39 to -6.03 %) and solar radiation (yield variation: -2.41 to 2.07 %). The trends of these meteorological variables have been further analyzed over the major cassava growing regions in India to link its variations with cassava production. A significant trend has been detected during the monsoon season in northeast India, with a decadal change of 0.63ºC. At the same time, a significant trend was detected in the peninsular region during the winter season, with a value of 0.74ºC/decade. The rate of solar dimming in northeast India during the monsoon season was -0.53 hour/decade and during the autumn season, it was -0.25 hour/decade, respectively. The meteorological sensitivity of crop model on its yield and trends may assist the decision-makers in developing appropriate plans mitigations strategies to enhance crop production to ensure food security.

scholarly journals Spatiotemporal and Source Analysis of Ultrafine Particulates (PM1) Over Bengaluru, Karnataka, India

2020 ◽  
Author(s):  
manjunatha A S ◽  
K E Ganesh
Keyword(s):  
Elemental Composition ◽  
Mass Concentration ◽  
Anthropogenic Activities ◽  
Monsoon Season ◽  
Winter Season ◽  
Ambient Air ◽  
Source Analysis ◽  
Composition Analysis ◽  
Average Mass ◽  
Air Atmosphere

Abstract Measurements and analysis of Particulate Matter of aerodynamic diameter 1µm (PM1) has been carried out using indigenously built air sampler APM 577from IIT-Kfor the study period July 2018- July 2019at the following locations of Bengaluru city: Basavanagudi (BAS), Domlur (DOM), Hosur road (HOS) and DC Halli (DCH).The mass concentration of collected PM1 sampleshas been observed to vary from 20.16 µg/m3 to 68.64 µg/m3during the studyperiod. The highest mass concentration of 68.64 µg/m3 was observed for the location BAS and the lowest mass concentration of20.16 µg/m3 was observed for the location DOM. The average mass concentration ofPM1 around Bengaluru for winter, summer, monsoon & post monsoon season is observed to be 47.60 µg/m3,40.24 µg/m3,30.85 µg/m3 and 38.76 µg/m3respectively. The average 24hrmass concentrations of PM1in winter season is found to be higher than National Ambient Air Quality Standards(NAAQS)limit of 60µg/m3 for PM2.5. The SEM-EDAX techniques were used to understand morphology and elemental composition of PM1. SEM Imaging technique confirms the fact that in ambient air atmosphere near the study locations the source of PM1is mainly from anthropogenic activities(primary) and natural (secondary) formation. Also,some of the collected samples showed the presence of microorganisms and biological particles such as bacillus. Elemental composition analysis made by EDAX technique showed the presence of non -metals such as Carbon, Oxygen, Nitrogen, Aluminium, Sulphur and potassium.

PREVALENCE OF PSEUDOINVERTA ORAIENSIS IN FRESH WATER FISH, CLARIAS BATRACHUS

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
ADITYA NARAYAN
Keyword(s):  
Fresh Water ◽  
Monsoon Season ◽  
Winter Season ◽  
Uttar Pradesh ◽  
Summer Season ◽  
Clarias Batrachus ◽  
Fresh Water Fish ◽  
Water Fish

The present investigation deals with the prevalence of infection of cestode, Pseudoinverta oraiensis19 parasitizing Clarias batrachus from Bundelkhand Region (U.P.) India. The studies were recorded from different sampling stations of Bundelkhand region of Uttar Pradesh. For this study 360 fresh water fish, Clarias batrachus were examined. The incidence of infection, monsoon season (17.50%) followed by winter season (20.00%) whereas high in summer season (30.00%).

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