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Unger, Daniela; Jennerjahn, Tim C (2009): Particle flux studies of sediment traps from the northern and equatorial Indian Ocean [dataset publication series]. PANGAEA,, Supplement to: Unger, D; Jennerjahn, TC (2009): Impact of regional Indian Ocean characteristics on the biogeochemical variability of settling particles. In: Wiggert, J; Naqvi, SWA; Smith, S; Hood, RR (eds.) Indian Ocean Biogeochemical Processes and Ecological Variability. AGU, Geophysical Monograph Series, 185, 257-280,

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The Asian monsoon system governs seasonality and fundamental environmental characteristics in the study area from which two distinct peculiarities are most notable: upwelling and convective mixing in the Arabian Sea and low surface salinity and stratification in the Bay of Bengal due to high riverine input and monsoonal precipitation. The respective oceanography sets the framework for nutrient availability and productivity. Upwelling ensures high nitrate concentration with temporal/spatial Si limitation; freshwater-induced stratification leads to reduced nitrogen input from the subsurface but Si enrichment in surface waters. Ultimately, both environments support high abundance of diatoms, which play a central role in the export of organic matter. It is speculated that, additional to eddy pumping, nitrogen fixation is a source of N in stratified waters and contributes to the low-d15N signal in sinking particles formed under riverine impact. Organic carbon fluxes are best correlated to opal but not to carbonate, which is explained by low foraminiferal carbonate fluxes within the river-impacted systems. This observation points to the necessity of differentiating between carbonate sources for carbon flux modeling. As evident from a compilation of previously published and new data on labile organic matter composition (amino acids and carbohydrates), organic matter fluxes are mainly driven by direct input from marine production, except the site off Pakistan where sedimentary input of (marine) organic matter is dominant during the NE monsoon. The explanation of apparently different organic carbon export efficiency calls for further investigations of, for example, food web structure and water column processes.
Related to:
Ramaswamy, Venkitasubramani; Gaye, Birgit (2006): Regional variations in the fluxes of foraminifera carbonate, coccolithophorid carbonate and biogenic opal in the northern Indian Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 53(2), 271-293,
Median Latitude: 9.167344 * Median Longitude: 85.724224 * South-bound Latitude: -8.291700 * West-bound Longitude: 65.820000 * North-bound Latitude: 24.770000 * East-bound Longitude: 108.033300
Date/Time Start: 1990-01-03T12:00:00 * Date/Time End: 2001-11-02T00:00:00
CBBT * Latitude: 13.116660 * Longitude: 84.400000 * Method/Device: Mooring (MOOR) * Comment: central Bay of Bengal trap
EIOT (Equatorial Indian Ocean Trap Station) * Latitude: 3.560000 * Longitude: 77.780000 * Elevation: -3400.0 m * Location: Lakshadweep Sea * Method/Device: Trap, sediment (TRAPS)
EPT (East Pakistan Trap Station) * Latitude: 24.770000 * Longitude: 65.820000 * Elevation: -1093.0 m * Location: Arabian Sea * Method/Device: Trap, sediment (TRAPS)
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