Biochemical Composition of Organic Matter in Water of the Eastern Part of the Indian Ocean

2000 ◽  
Vol 36 (1) ◽  
pp. 9
Author(s):  
Yu. P. Kopytov ◽  
I. M. Tsymbal ◽  
I. A. Divavin
Keyword(s):  
Organic Matter ◽  
Indian Ocean ◽  
Biochemical Composition ◽  
The Indian Ocean

scholarly journals The Ballast Effect of Lithogenic Matter and its Influences on the Carbon Fluxes in the Indian Ocean

2018 ◽  
Author(s):  
Tim Rixen ◽  
Birgit Gaye ◽  
Kay-Christian Emeis ◽  
Venkitasubramani Ramaswamy
Keyword(s):  
Organic Matter ◽  
Indian Ocean ◽  
Organic Carbon ◽  
Deep Sea ◽  
Carbon Fluxes ◽  
Co2 Uptake ◽  
Surface Ocean ◽  
Carbon Pump ◽  
The Indian Ocean ◽  
The Impact

Abstract. Data obtained from long-term sediment trap experiments in the Indian Ocean were analysed in conjunction with satellite-derived observations and results obtained from a box model to study the influence of primary production and the ballast effect on organic carbon flux into the deep sea. The results are used to better understand the associated impacts on the CO2 uptake of the organic carbon pump. In line with other findings derived from global data sets, our results suggest that a preferential export of organic matter in slower-sinking particles reduces the transfer efficiency of exported organic matter in high-productive systems compared with low-productive regions. The resulting enhanced respiration of organic matter maintains the high nutrient availability in the surface ocean and thus the high productivity during the summer and winter bloom in the Arabian Sea. In turn, mineral ballast is essential for the transport of organic matter and nutrients into the deep sea. The additional lithogenic ballast effect can increase organic carbon fluxes by 60 %. Our model results indicate that lithogenic ballast enhances the CO2 uptake of the organic carbon pump by increasing the amount of nutrients utilised by the organic carbon pump to bind CO2. By enhancing the export of organic matter into the deep sea, the ballast effect increases the residence time of these nutrients in the ocean. They lose the attached CO2 if they are introduced into the surface ocean at higher latitude, where the lack of light prevents photosynthesis in winter. Considering the impact of the lithogenic ballast effect on the organic carbon export into the deep sea and the enhanced mobilisation of lithogenic matter due to land-use changes, it is assumed that humans influence the CO2 uptake of the organic carbon pump, which might hold relevance for the discussion about the anthropogenic CO2 uptake of the ocean.

Biochemical composition of sedimentary organic matter in the coral reefs of Lakshadweep Archipelago, Indian Ocean

2019 ◽  
Vol 35 (9) ◽  
pp. 805-824 ◽  
Author(s):  
Anu Joy ◽  
P. Anoop ◽  
R. Rajesh ◽  
Jose Mathew ◽  
Angel Mathew ◽  
...  
Keyword(s):  
Organic Matter ◽  
Indian Ocean ◽  
Coral Reefs ◽  
Biochemical Composition ◽  
Sedimentary Organic Matter ◽  
Lakshadweep Archipelago

scholarly journals ORGANIC MATTER AND NUTRIENT PROFILE OF THE TWO-CURRENT-REGULATED-ZONE IN THE SOUTHWESTERN SUMATRAN WATERS (SSW)

2017 ◽  
Vol 42 (1) ◽  
pp. 19-35
Author(s):  
A'an Johan Wahyudi ◽  
Mochamad R. Iskandar ◽  
Hanny Meirinawati ◽  
. Afdal ◽  
Indra B. Vimono ◽  
...  
Keyword(s):  
Organic Matter ◽  
Indian Ocean ◽  
Heterotrophic Bacteria ◽  
Chemical Properties ◽  
Nutrient Profile ◽  
The Indian Ocean ◽  
Physical Profile ◽  
Physical And Chemical ◽  
Counter Current ◽  
And Chemical Properties

The Indian Ocean is influenced by monsoon systems which alter the ocean’s physical and chemical properties. Specifically, the southwestern Sumatran waters in the eastern Indian Ocean are considered a dual current regulated zone i.e. affected by South Equatorial Counter Current (SECC) and South Java Current (SJC). This area is considered as having an important role in the transfer of organic matter or the biological pump. However, the information about this area is minimal, especially in terms of organic matter and nutrient profile. This study will update the recent information about the area, including the profile of particulate organic matter (POM), macro-nutrients, total suspended solids (TSS), macromolecule-degradingbacteria, and soft bottom macrobenthic organisms sampled from 26 stations in both the SECC-regulated zone and the SJC-regulated zone. The physical profile is typical of tropical watersand both zones have a distinct profile of organic matter and nutrients. The particulate organic carbon (POC), particulate organic nitrogen (PON), and TSS of the SECC-regulated zone can be considered higher than those of the SJC-regulated zone. This region is categorized as mesotrophic waters, especially from the surface up to 100 m. The production of nutrients and organic matter in the water column in this area contribute significantly to the abundance of heterotrophic bacteria and benthic organisms.

scholarly journals Determining the Distribution of Fluorescent Organic Matter in the Indian Ocean Using in situ Fluorometry

2020 ◽  
Vol 11 ◽  
Author(s):  
Masahito Shigemitsu ◽  
Hiroshi Uchida ◽  
Taichi Yokokawa ◽  
K. Arulananthan ◽  
Akihiko Murata
Keyword(s):  
Organic Matter ◽  
Indian Ocean ◽  
Spatial Data ◽  
Water Mass ◽  
Turnover Time ◽  
Global Ocean ◽  
Oxygen Utilization ◽  
Basin Scale ◽  
The Indian Ocean

In order to determine the dynamics of marine fluorescent organic matter (FOM) using high-resolution spatial data, in situ fluorometers have been used in the open ocean. In this study, we measured FOM during the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) expedition from early December 2019 to early February 2020, using an in situ fluorometer at 148 stations along the two meridional transects (at ∼80 and ∼57°E) in the Indian Ocean, covering latitudinal ranges from ∼6°N to ∼20°S and ∼30 to ∼65°S, respectively. The FOM data obtained from the fluorometer were corrected for known temperature dependence and calibrated using FOM data measured onboard by a benchtop fluorometer. Using the relative water mass proportions estimated from water mass analyses, we determined the intrinsic values of FOM and apparent oxygen utilization (AOU) for each of the 12 water masses observed. We then estimated the basin-scale relationship between the intrinsic FOM and the AOU, as well as the turnover time for FOM in the Indian Ocean (410 ± 19 years) in combination with the microbial respiration rate in the dark ocean (>200 m). Consistent to previous estimates in the global tropical and subtropical ocean, the FOM turnover time obtained is of the same order of magnitude as the circulation age of the Indian Ocean, indicating that the FOM is refractory and is a sink for reduced carbon in the dark ocean. A decoupling of FOM and AOU from the basin-scale relationship was also observed in the abyssal waters of the northern Indian Ocean. The local variability may be explained by the effect of sinking organic matter altered by denitrification through the oxygen-deficient zone on enhanced abyssal FOM production relative to oxygen consumption.

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