Jurnal Internasional Variasi Denitrifikasi dan Ventilasi Dalam Zona Minimum Oksigen Laut Arab Selama Holocene – Kessarkar – – Geokimia, Geofisika, Geosystems
Denitrification and Ventilation Variations In Minimum Zone of Arab Sea Oxygen During Holocene - Kessarkar - - Geochemistry, Geophysics, Geosystems
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The slopes of the Indian subcontinent are exposed to the intangible, intense minimum oxygen zones (OMZ) supports the pelagic denitrification. Sediments that are currently in contact with the lower limit of the denitrification zone indicating the changes marked in medium and low water vents from OMZ over the last 9,500 years. That δ 15 N sediment indicates that OMZ water is less ventilated during early Holocene (between 9.5 and 8.5 ka BP) produces an intensive denitrification condition with the average value of δ 15 N 7.8 ‰, while at the same time stable Mo isotopic composition (mean δ 98 Mo of -0.02 ‰) indicates that bottom waters in contact with sediment better oxygenated. In the mid-Holocene OMZ becomes more oxygen suppression denitrification (mean δ 15 N of 6.2 ‰), whereas the bottom waters gradually become less oxygen (mean δ 98 Mo of 1.7 ‰). The reduction in the middle-Holocene denitrification takes place simultaneously with the global N 2 O decline as summarized from the ice core record, which is consistent with the decrease in contribution from the Arabian Sea. Since ~ 5.5 ka BP OMZ waters have been progressive deoxygenation is accompanied by increased denitrification.