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| Abstract Submission No. | ABS-2022-05-0298 |
| Title of Abstract | Natural isotopic composition of carbon and nitrogen in particulate organic matter in the Arabian Sea |
| Authors | Rupa Mukherjee*, Arvind Singh, Anil Patel, P Kiran Kumar, Neeraj Rastogi, Sanjeev Kumar |
| Organisation | Physical Research Laboratory (Presently at Rajendra College) |
| Address | Department of Chemistry, Rajendra College Chapra-Saran, Bihar, India Pincode: 841301 Mobile: 7488240933 E-mail: rpmkhrj@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Stable carbon and nitrogen isotopes (δ13C and δ15N) are widely used to distinguish between the sources of organic matter, and the influence of anthropogenic activity in an aquatic environment. δ13C is particularly useful to differentiate between land and marine sources of organic matter whereas, δ15N of the particulate organic matter (POM) provides an insight into the availability and utilization of nutrients along with identifying the transformation processes in the oceanic environment. We measured δ13C and δ15N of POM in the central and eastern Arabian Sea (AS) during spring 2017. In the central AS, the δ13C values showed mixing between continental inputs and marine sources (⿿ 24 to ⿿ 27 ⿰) however, in the eastern AS, the values were of purely marine origin (~ ⿿22 ⿰). On the other hand, the δ15N values were within marine range (~ 8 to 10 ⿰) up to 100 m depths in most of the stations whereas, enriched values above 12⿰ were obtained below 100 m indicating signatures of denitrification. |