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Articles by N. Chandramohanakumar
Total Records ( 3 ) for N. Chandramohanakumar
  Manju Mary Joseph , C.S. Ratheesh Kumar , T.R. Gireesh Kumar , K. R. Renjith and N. Chandramohanakumar
  Variability of nature and composition of organic matter in the surficial sediments of mangrove and estuarine systems of Cochin were investigated. Assessment of biochemical composition and elements such as carbon, nitrogen and sulphur were employed for this. Irrespective of the higher content of total organic matter, the labile organic matter was very low in both mangrove and estuarine sediments. Concentrations of biochemical compounds were comparatively higher in mangrove sediments. Total lipids were the dominant class among labile organic compounds in both mangrove and estuarine sediments contributing 51.4% and 45.3%, respectively. Protein to carbohydrate ratio was higher in estuarine sediments when compared to mangroves, indicating low dead organic matter accumulation, probably due to the strong hydrodynamic conditions in estuaries. Correlation analysis showed that sediment texture had no significant correlation with any of the sedimentary parameters in mangroves, whereas in estuaries, it showed significant correlations with most of the sedimentary parameters. Principal component analysis indicated three different dominant processes in mangroves namely mangrove litter addition, diagenesis and other geochemical process like siltation and sorption/desorption, while in estuaries the dominant process seems to be diagenesis.
  P. R. Sarika and N. Chandramohanakumar
  The distribution and speciation of Fe, Mn and Cu in six geographically different mangroves of the south west coast of India have been examined. The metal concentrations in sediments ranged from 0.53-95.44 mg/g for iron, 12.16-325.98 μg/g for manganese and 0.13-243.32 μg/g for copper. The metal levels in sediments were comparable with those from similar aquatic systems. Speciation of metals in sediments and principal component analysis (PCA) of the speciation data indicates that ultimate storage of iron is in the inorganic pyrite form. Manganese and copper exhibit temporary storage by associations with organic matter.
  Josia Jacob , K. A. Jayaraj , H. Habeeb Rehman , N. Chandramohanakumar , K. K. Balachandran , T. V. Raveendran , Thresiamma Joseph , Maheswari Nair and C. T. Achuthankutty
  Surface sediments from the western continental shelf of India were analysed for total organic carbon (TOC), total nitrogen (TN), total hydrolysable carbohydrates (TCHO) and proteins (PRT) during the late summer monsoon (September-October, 2003) and pre-monsoon (March-April, 2004) seasons. The region experienced entirely different hydrographic characteristics and productivity patterns during the two seasons. Low oxygenated, cold, nutrient rich (DO<180 µM, SST<28°C, NO3>2 µM) surface waters and the existence of subsurface suboxia were the hydrographic features during late summer due to the persistence of upwelling. Meanwhile, during pre-monsoon the region was oligotrophic and oxygen saturated (DO>200 µ M, NO3<2 µ M). Satellite imagery, in situ Chl a and zooplankton biomass showed high production along the region during late summer compared to pre-monsoon. Sedimentary organic matter (SOM) was of marine origin during both seasons, as indicated by the C/N ratios. TCHO+PRT: TOC and PRT: TCHO revealed aged organic matter and did not change between the seasons. During late summer, TOC and the reactive organic matter (TCHO and PRT) in the surface sediments were concentrated along the regions (13-17° N) where active upwelling was observed, suggesting a close coupling between SOM characteristics and the surface ocean productivity.
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