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dc.contributor.authorSarma, V.V.S.S.
dc.contributor.authorSridevi, B.
dc.date.accessioned2024-10-03
dc.date.accessioned2024-10-10T11:46:06Z
dc.date.available2024-07-15
dc.date.available2024-10-10T11:46:06Z
dc.date.issued2024
dc.identifier.citationMarine Chemistry, vol.265-266; 2024; Article no: 104429
dc.identifier.issn0304-4203
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S030442032400080X
dc.identifier.urihttps://doi.org/10.1016/J.MARCHEM.2024.104429
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9307
dc.descriptionIF2023= 3.0
dc.description.abstractInorganic nitrogen is the major limiting nutrient in the northern Indian Ocean. The published and unpublished data of nitrate (NO3?) and ammonium (NH4+) uptake rates and estimated f-ratios (new to total production) for the past 3 decades were compiled for the northern Indian Ocean. Though the data covered seasonality in the northern Indian Ocean, however, it is biased with reference to space. Both NO3? and NH4+ uptake rates displayed significant spatial variability associated with hydrographic properties. The mean NO3? uptake rates at surface were not different in the Arabian Sea (0.07 � 0.1 mmol m?3 d?1) than Bay of Bengal (BoB; 0.04 � 0.02 mmol m?3 d?1), however, photic zone integrated rates were higher in the BoB (4.5 � 2 mmol m?2 d?1) than Arabian Sea (2.7 � 2 mmol m?2 d?1) due to higher uptakes rates at the subsurface chlorophyll-a (Chl-a) maxima region in the BoB. The basin average NH4+ uptakes at the surface were almost same in the Arabian Sea (0.4 � 0.3 mmol m?3 d?1) and BoB (0.5 � 0.5 mmol m?3 d?1), the photic zone integrated NH4+ uptake rates are 6 times higher in the Arabian Sea (15 � 8 mmol m?2 d?1) than BoB (2.3 � 1 mmol m?2 d?1). This difference is mainly caused by deeper photic depth in the Arabian Sea (75 � 8 m) than BoB (62 � 5 m) due to high suspended load from rivers in the latter basin. High f-ratios were observed in the BoB (>0.5) than that of Arabian Sea (<0.2) suggesting that about half of the primary production is potentially exported from the mixed layer in the BoB whereas less than one-fifth only exported in the case of the Arabian Sea. The photic-zone integrated NO3? uptake rates and f-ratios displayed a significant relationship with surface temperature, salinity, surface Chl-a and nutrients concentrations suggesting that nitrogen uptake rates were mainly controlled by hydrographic properties. The compiled nitrogen uptake rates and f-ratio may be useful to improve simulations of cycling of carbon, nitrogen, and oxygen in the numerical models.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleSpatial variability in nitrogen uptake rates and f-ratio in the northern Indian Ocean
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India


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