Riverine influence on nitrogen fixation in the upwelling region off Vietnam, South China Sea

Maren Voss; Deniz Bombar; Natalie Loick; Joachim W. Dippner

doi:10.1029/2005GL025569

Riverine influence on nitrogen fixation in the upwelling region off Vietnam, South China Sea

Maren Voss^*, Deniz Bombar, Natalie Loick, Joachim W. Dippner

^*Corresponding author for this work

Marine Biology

66 Citations (Scopus)

Abstract

Nitrogen fixation is assumed to be most important in oligotrophic subtropical regions of the oceans. Here we show that nitrogen fixation can also be pronounced in the upwelling region off Vietnam. We compare nitrogen fixation rates and other hydro-chemical variables from the monsoon season with the intermonsoon season and find that nitrogen fixation rates are app. 10 times higher during the monsoon season. However, this was not the case in the actual upwelling region - a 40-50 km wide strip along the coast - but further offshore, where the Mekong plume was noticeable. Therefore, we hypothesize that the stability of the water column, micronutrients and/or trace metals in the Mekong river plume may be responsible for enhanced cyanobacterial growth. These cyanobacteria may be either Trichodesmium, unicellular, or diatom-associated symbionts, the latter are known from other river plumes like the Amazon.

Original language	English
Article number	L07604
Journal	Geophysical Research Letters (Online)
Volume	33
Issue number	7
ISSN	0094-8276
DOIs	https://doi.org/10.1029/2005GL025569
Publication status	Published - 16 Apr 2006

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title = "Riverine influence on nitrogen fixation in the upwelling region off Vietnam, South China Sea",

abstract = "Nitrogen fixation is assumed to be most important in oligotrophic subtropical regions of the oceans. Here we show that nitrogen fixation can also be pronounced in the upwelling region off Vietnam. We compare nitrogen fixation rates and other hydro-chemical variables from the monsoon season with the intermonsoon season and find that nitrogen fixation rates are app. 10 times higher during the monsoon season. However, this was not the case in the actual upwelling region - a 40-50 km wide strip along the coast - but further offshore, where the Mekong plume was noticeable. Therefore, we hypothesize that the stability of the water column, micronutrients and/or trace metals in the Mekong river plume may be responsible for enhanced cyanobacterial growth. These cyanobacteria may be either Trichodesmium, unicellular, or diatom-associated symbionts, the latter are known from other river plumes like the Amazon.",

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AU - Voss, Maren

AU - Bombar, Deniz

AU - Loick, Natalie

AU - Dippner, Joachim W.

PY - 2006/4/16

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N2 - Nitrogen fixation is assumed to be most important in oligotrophic subtropical regions of the oceans. Here we show that nitrogen fixation can also be pronounced in the upwelling region off Vietnam. We compare nitrogen fixation rates and other hydro-chemical variables from the monsoon season with the intermonsoon season and find that nitrogen fixation rates are app. 10 times higher during the monsoon season. However, this was not the case in the actual upwelling region - a 40-50 km wide strip along the coast - but further offshore, where the Mekong plume was noticeable. Therefore, we hypothesize that the stability of the water column, micronutrients and/or trace metals in the Mekong river plume may be responsible for enhanced cyanobacterial growth. These cyanobacteria may be either Trichodesmium, unicellular, or diatom-associated symbionts, the latter are known from other river plumes like the Amazon.

AB - Nitrogen fixation is assumed to be most important in oligotrophic subtropical regions of the oceans. Here we show that nitrogen fixation can also be pronounced in the upwelling region off Vietnam. We compare nitrogen fixation rates and other hydro-chemical variables from the monsoon season with the intermonsoon season and find that nitrogen fixation rates are app. 10 times higher during the monsoon season. However, this was not the case in the actual upwelling region - a 40-50 km wide strip along the coast - but further offshore, where the Mekong plume was noticeable. Therefore, we hypothesize that the stability of the water column, micronutrients and/or trace metals in the Mekong river plume may be responsible for enhanced cyanobacterial growth. These cyanobacteria may be either Trichodesmium, unicellular, or diatom-associated symbionts, the latter are known from other river plumes like the Amazon.

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Riverine influence on nitrogen fixation in the upwelling region off Vietnam, South China Sea

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