Indian Journal of Geo-Marine Sciences

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Published by: NISCAIR (CSIR)

Subjects: Earth Science Geo-Marine Science

This journal was started in 1972 and this multi-disciplinary journal publishes full papers and short communications in the following areas: marine biology, marine chemistry, marine geology, physical oceanography, ocean engineering, marine instrumentation, marine corrosion and material science, satellite oceanography & modeling, marine engineering, marine pollution, marine archaeology, coastal zone management.

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Editor, IJGMS, National Institute of Science Communication And Information Resources, CSIR, K S Krishnan Marg, Pusa Campus, New Delhi 110 012, India Phone:25846301,03-07 (Extn-248); Fax:(91)(11) 25847062 E-mail: sundaresanj@hotmail.com


ISSN No. :    0379-5136
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Oceanic mixed layer variations during the movement of cyclone along symmetric tracks in the Indian Ocean
Title: Oceanic mixed layer variations during the movement of cyclone along symmetric tracks in the Indian Ocean

Authors: Deo, A. A.; Ganer, D.W.; Salvekar, P. S.

Abstract: The understanding of significant changes in the oceanic mixed layer is important for dynamical prediction of tropical cyclone. Present study aims at examining the variations in the upper ocean parameters during the movement of tropical cyclone in northern and southern Indian Ocean, by applying 1½ layer wind driven reduced gravity ocean model. Different idealized tracks in the Bay of Bengal and their mirror images in southern hemisphere are considered, The model produced mixed layer depth, temperature and currents are compared for northern and southern hemispheric cyclone cases. Also the effect of latitude for westward moving cyclones in both the hemisphere is investigated. For this, tracks in the Arabian Sea and their counter parts in the southern hemisphere are considered. The maximum cooling found in the wake of cyclone is of the order of 3 - 4°C, which is comparable with earlier studies and observations. This significant cooling can cause weakening of the storm. This can be useful for prediction especially in the event of a cyclonic storm heading towards land and likely to make land fall. Moreover it is also seen that the mixed layer is cooled more on the right (left) of the storm track in northern (southern) hemisphere. This cooling decreases for the storms translating along higher latitudes implying the sensitivity of the latitudinal location of the storm.

Page(s): 111-122

Assessment of mercury pollution through mercury resistant marine bacteria in Bhitarkanika mangrove ecosystem, Odisha, India
Title: Assessment of mercury pollution through mercury resistant marine bacteria in Bhitarkanika mangrove ecosystem, Odisha, India

Authors: Dash, Hirak Ranjan; Das, Surajit

Abstract: Level of mercury pollution by estimating the number of mercury resistant marine bacteria is examined in this study. Total mercury levels in the water and sediment samples were estimated between 0.14 and 0.66 ppb (0.00014 and 0.00066 ppm) and from 0.23 to 0.97 ppb (0.00023 to 0.00097 ppm) respectively. pH, temperature and salinity level of the water samples were in the range of 7.13-7.16, 27.35-36.1ºC and 14.25-15.6 ppt respectively during this period. Mercury resistant marine bacteria followed the trend of mercury level and ranged from 2.60×103 to 7.05×104 CFU/mL and from 0.16×103 to 7.4×104 CFU/g in water and sediment respectively. Percentage of mercury resistant bacteria varied from 0.12 to 89.28 in water and 0.14 to 88.88 in sediment. Some of the resistant isolates (positive for mer operon mediated mercury resistance) were characterized further. They were found to be under the genera Vibrio and Bacillus which can resist other toxic metals (Cd, Zn, Pb, As) as well as antibiotics (AM, VA, NX, AZM, A, AC) confirming the pollution level in the ecosystem.

Page(s): 1103-1115

Mercury exposure Aasessment in fish and humans from Sundarban Mangrove Wetland of India
Title: Mercury exposure Aasessment in fish and humans from Sundarban Mangrove Wetland of India

Authors: Chatterjee, M.; Basu, N.; Sarkar, S. K.

Abstract: Present study had documented total mercury levels in six commonly consumed fish species, and performed a cross-sectional study on local residents to gauge their intake of fish (via dietary survey) and mercury exposure (via hair biomarker analyses). Mean total mercury content in edible composites of locally-caught fishes (topse, hilsa, mackerel, topse, sardinella, khoira) was low and ranged from 0.01 to 0.11 μg g-1 mercury, dry weight. In a cross-sectional study of 58 area residents, the mercury content in hair ranged from 0.25 to 1.23 μg g-1, with a mean of 0.65 ± 0.23 μg g-1. Hair mercury level was not influenced by gender, age, or occupation. Mean number of meals consumed per week was 3.1 ± 1.1, and all participants consumed at least one fish meal per week. When related to fish consumption, a significant positive association was found between number of fish meals consumed per week and hair mercury levels.

Page(s): 1095-1101

Sedimentary geochemistry of Chorao Island, Mandovi mangrove estuarine complex, Goa
Title: Sedimentary geochemistry of Chorao Island, Mandovi mangrove estuarine complex, Goa

Authors: Sappal, Swati M.; Ramanathan, AL.; Ranjan, Rajesh K.; Singh, Gurmeet

Abstract: Present study highlighted significant anthropogenic contributions in terms of heavy metal pollution in Mandovi estuarine complex. Sediment core was collected which was analyzed for different physico-chemical parameters. Sediments were found to be mature, quartz rich and weathering does not seem to play any role. Biological activities were significant due to abundance of S and OC in the sediments which along with the redox conditions controlled the metal variability. Sediments were found to be enriched with respect to heavy metals like Pb and Mn indicating anthropogenic influence in this region.

Page(s): 1085-1094

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