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    <title>DRS Collection: Interdisciplinary Oceanography</title>
    <link>http://drs.nio.org/drs/handle/2264/6</link>
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      <title>The Collection's search engine</title>
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      <title>n-Alkanes in surficial sediments of Visakhapatnam harbour, east coast of India</title>
      <link>http://drs.nio.org/drs/handle/2264/4292</link>
      <description>Title: n-Alkanes in surficial sediments of Visakhapatnam harbour, east coast of India
&lt;br/&gt;
&lt;br/&gt;Authors: Punyu, V.R.; Harji, R.R.; Bhosle, N.B.; Sawant, S.S.; Venkat, K.
&lt;br/&gt;
&lt;br/&gt;Abstract: Surface sediments collected from 19 stations along Visakhapatnam harbour were analysed for organic carbon (OC), delta sup(13)C sub(oc), total lipids (TL), total hydrocarbon (THC), n-alkane concentration and composition. OC, delta sup(13)C sub(oc), TL and THC ranged from 0.6 percent to 7.6 percent, -29.3 to -23.8 ppt, 300 to 14,948 mu g g sup(-1) dw, and 0.2 to 2,277 mu g g sup(-1) dw, respectively. Predominance of even carbon numbers n-alkanes C12–C21 with carbon preference index (CPI) of less than 1 suggests major microbial influence. Fair abundance of odd carbon number n-alkanes in the range of C sub(15)–C sub(22) and C sub(23)–C sub(33) indicates some input from phytoplankton and terrestrial sources, respectively. Petrogenic input was evident from the presence of hopanes and steranes. The data suggest that organic matter (OM) sources varied spatially and were mostly derived from mixed source.</description>
      <pubDate>Mon, 29 Oct 2012 22:58:59 GMT</pubDate>
    </item>
    <item>
      <title>Geochemistry of the suspended sediment in the estuaries of the Mandovi and Zuari rivers, central west coast of India</title>
      <link>http://drs.nio.org/drs/handle/2264/4288</link>
      <description>Title: Geochemistry of the suspended sediment in the estuaries of the Mandovi and Zuari rivers, central west coast of India
&lt;br/&gt;
&lt;br/&gt;Authors: Kessarkar, P.M.; Shynu, R.; Rao, V.P.; Chong, F.; Narvekar, T.; Zhang, J.
&lt;br/&gt;
&lt;br/&gt;Abstract: The geochemistry of the suspended particulate matter (SPM) collected during the monsoon was determined to identify the sources of SPM and to understand the physicochemical processes in the Mandovi and Zuari river estuaries. The concentrations of SPM decrease seaward in both estuaries, but are relatively high at bay stations. Kaolinite is the most dominant clay mineral in the upstream of both rivers. Smectite increases seaward in both estuaries and is abundant in the bay. Upstream stations of Mandovi, where ore deposits are stored on the shore, exhibit high Fe, Mn, total rare earth elements (total REE), and middle REE- and heavy REE-enriched patterns. Channel stations of both estuaries exhibit middle REE- and light REE-enriched patterns, which gradually changed seaward to middle REE- and heavy REE-enriched patterns. Canal stations exhibit the highest concentrations of major and trace metals. High metal/Al ratios occur at stations in the upstream of Zuari and at the confluence of canals in the Mandovi estuary. Enrichment factors of metals indicate that Mn is significantly polluted while other metals are moderately polluted. The delta 13C and delta 15N of organic matter indicate that the terrigenous organic matter at the upstream is diluted seaward by marine organic matter. Organic matter at bay stations is largely marine and altered-type. The compositions of SPM are controlled by the particulates from ore dust, the geology of the drainage basins, and the physicochemical processes in the estuaries. Particulates resuspended from the bay are dominated by ore dust, which are advected into the channels of both estuaries during the lull periods of the monsoon.</description>
      <pubDate>Mon, 29 Oct 2012 22:58:59 GMT</pubDate>
    </item>
    <item>
      <title>Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal</title>
      <link>http://drs.nio.org/drs/handle/2264/4286</link>
      <description>Title: Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal
&lt;br/&gt;
&lt;br/&gt;Authors: Sarma, V.V.S.S.; Sridevi, B.; Maneesha, K.; Sridevi, T.; Naidu, S.A.; Prasad, V.R.; Venkataramana, V.; Acharya, T.; Bharati, M.D.; Subbaiah, C.V.; Kiran, B.S.; Reddy, N.P.C.; Sarma, V.V.; Sadhuram, Y.; Murty, T.V.R.
&lt;br/&gt;
&lt;br/&gt;Abstract: Time-series observations were conducted off Visakhapatnam, central west coast of Bay of Bengal, from October 2007 to April 2009 to examine the influence of physical and atmospheric processes on water column nutrients biogeochemistry. The thermal structure displayed inversions of 0.5 to 1.0 degrees C during winter and were weaker in summer. The water column was vertically stratified during the entire study period and was stronger during October-November 2007 and August-December 2008 compared to other study periods. High concentrations of chlorophyll-a and nutrients were associated with the extreme atmospheric events. The strong relationship of nutrients with salinity indicates that physical processes, such as circulation, mixing and river discharge, have a significant control on phytoplankton blooms in the coastal Bay of Bengal. Phosphate seems to be a controlling nutrient during winter whereas availability of light and suspended matter limits production in summer. Formation of low oxygen conditions were observed in the bottom waters due to enhanced primary production by extreme atmospheric events; however, re-oxygenation of bottom waters through sinking of oxygen-rich surface waters by a warm core (anticyclonic) eddy led to its near recovery. This study reveals that atmospheric and physical processes have significant impacts on the water column biogeochemistry in the coastal Bay of Bengal.</description>
      <pubDate>Mon, 29 Oct 2012 22:58:59 GMT</pubDate>
    </item>
    <item>
      <title>Operational forecast of oil spill trajectory and assessment of impacts on intertidal macrobenthos in the Dahanu region, west coast of India</title>
      <link>http://drs.nio.org/drs/handle/2264/4285</link>
      <description>Title: Operational forecast of oil spill trajectory and assessment of impacts on intertidal macrobenthos in the Dahanu region, west coast of India
&lt;br/&gt;
&lt;br/&gt;Authors: Naidu, V.S.; Sukumaran, S.; Dubbewar, O.; Reddy, G.S.
&lt;br/&gt;
&lt;br/&gt;Abstract: A two-dimensional model has been developed and applied to the hypothetical spills of crude oil in the Dahanu area on the west coast of India. An attempt has also been made to quantify the intertidal macrobenthic biomass and population affected in the region. Data on tides and currents were collected at Dahanu during October and November 2008. The currents recorded at a relatively offshore location show that the midcurrents were stronger than the bottom currents. The currents at a nearshore location were influenced by the Dahanu creek currents. Offshore currents were relatively stronger than the nearshore currents. The model calibration results of hydrodynamics show that the circulation was almost in agreement with the observations except in the creek zone. An oil spill model was run for two weather conditions, viz., postmonsoon and monsoon. An instantaneous crude oil spill of 500 tons (534 m sup(3)) was considered. The results show that the spill would move offshore in the presence of postmonsoonal winds. However, during the monsoon, the spill would move toward the coast. According to the positions of the occurrence, the spill would reach the coast within 13 to 28 hours from the time of spill. The coastline stretches an affected range from 2.1 to 2.8 km. The estimated affected macrobenthic biomass and population would be 109.2 to 145.6 kg and 1.9 to 2.5x10 sup(7), respectively. The major species affected would be polychaetes.</description>
      <pubDate>Mon, 29 Oct 2012 22:58:59 GMT</pubDate>
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