Anthropogenic nitrogen inputs and impacts on oceanic N2O fluxes in the northern Indian Ocean: The need for an integrated observation and modelling approach.

Suntharalingam, Parvadha, Zamora, Lauren M., Bange, Hermann W. , Bikkina, Srinivas, Buitenhuis, Erik, Kanakidou, Maria, Lamarque, Jean-Francois, Landolfi, Angela , Resplandy, Laure, Sarin, Manmohan M., Seitzinger, Sybil and Singh, Arvind (2019) Anthropogenic nitrogen inputs and impacts on oceanic N2O fluxes in the northern Indian Ocean: The need for an integrated observation and modelling approach. Deep Sea Research Part II: Topical Studies in Oceanography . DOI 10.1016/j.dsr2.2019.03.007.

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Abstract

Anthropogenically-derived nitrogen input to the northern Indian Ocean has increased significantly in recent decades, based on both observational and model-derived estimates. This external nutrient source is supplied by atmospheric deposition and riverine fluxes, and has the potential to affect the vulnerable biogeochemical systems of the Arabian Sea and Bay of Bengal, influencing productivity and oceanic production of the greenhouse-gas nitrous-oxide (N 2 O). We summarize current estimates of this external nitrogen source to the northern Indian Ocean from observations and models, highlight implications for regional marine N 2 O emissions using model-based analyses, and make recommendations for measurement and model needs to improve current estimates and future predictions of this impact. Current observationally-derived estimates of deposition and riverine nitrogen inputs are limited by sparse measurements and uncertainties on accurate characterization of nitrogen species composition. Ocean model assessments of the impact of external nitrogen sources on regional marine N 2 O production in the northern Indian Ocean estimate potentially significant changes but also have large associated uncertainties. We recommend an integrated program of basin-wide measurements combined with high-resolution modeling and more detailed characterization of nitrogen-cycle process to address these uncertainties and improve current estimates and predictions.

Document Type: Article
Keywords: Nitrous-oxide; Nitrogen cycle; Air-sea interaction; Atmospheric chemistry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.dsr2.2019.03.007
ISSN: 0967-0645
Related URLs:
Projects: GESAMP, MEMENTO, SCOR
Date Deposited: 22 May 2019 13:21
Last Modified: 24 May 2019 05:39
URI: http://oceanrep.geomar.de/id/eprint/46795

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