Nitrogen fixation under the interaction of Kuroshio and upwelling in the northeastern South China Sea

Liu, Jiaxing; Zhang, Huangchen; Ding, Xiang; Zhou, Linbin; Ke, Zhixin; Li, Jiajun; Tan, Yehui

doi:10.1016/j.dsr.2023.104147

Cited by 4 publications

(2 citation statements)

References 116 publications

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“…(2023) found the highest NFRs in the surface waters where the subsurface OMZ was most intense and N‐loss was the highest. In the South China Sea coastal upwelling region with bottom hypoxia, higher nitrogen fixation rates along with higher abundance of Trichodesmium and UCYN‐A were observed (Liu et al., 2023). Bonnet et al.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, in the northern Humboldt Upwelling System, Kittu et al (2023) found the highest NFRs in the surface waters where the subsurface OMZ was most intense and N-loss was the highest. In the South China Sea coastal upwelling region with bottom hypoxia, higher nitrogen fixation rates along with higher abundance of Trichodesmium and UCYN-A were observed (Liu et al, 2023). Bonnet et al (2023) found higher NFRs in naturally Fe-fertilized waters in the South Pacific (along the Tonga volcanic arc due to fluid emissions from shallow hydrothermal) than in adjacent unfertilized waters.…”

Section: N 2 Fixation In Nutrient-rich and -Poor Euphotic Zone Of The...mentioning

confidence: 96%

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Winter Convective Mixing Mediating Coupling of N‐Gain and ‐Loss in the Arabian Sea

Saxena,

Sahoo,

Nazirahmed

et al. 2024

JGR Oceans

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Marine dinitrogen (N2) fixation fuels primary production and thereby influences the Earth's climate. Yet, its geographical distribution and controlling environmental parameters remain debatable. We measured N2 fixation rates from the two spatially and physicochemically contrasting regions of the Arabian Sea during the winter monsoon: (a) the colder and nutrient‐rich waters in the northern region owing to winter convection and (b) the warmer and nutrient‐poor waters in the southern region unaffected by winter convection. We found higher N2 fixation rates at the surface of northern region due to convective mixing driven supply of phosphate (intuitively iron also) from the underlying suboxic waters. N2 fixation was favored by high nutrient concentrations in the euphotic waters, whereas remained unaffected by nutrient availability in the aphotic waters. We conclude that diazotrophs dwelling in the euphotic zone chose phosphate over fixed nitrogen‐poor waters. However, we found that among oligotrophic waters, anticyclonic eddy extremes the barrier of fixed nitrogen supply, and thereby, elevates N2 fixation. While the Arabian Sea loses about 20%–40% of the global ocean fixed nitrogen, we estimate that N2 fixation in the Arabian Sea offsets only up to 42% of its fixed nitrogen‐loss by denitrification, but this offset could be higher if diazotrophic activity is further examined up to the deeper depths of the Arabian Sea.

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Section: Discussionmentioning

confidence: 99%

Section: N 2 Fixation In Nutrient-rich and -Poor Euphotic Zone Of The...mentioning

confidence: 96%

Winter Convective Mixing Mediating Coupling of N‐Gain and ‐Loss in the Arabian Sea

Saxena,

Sahoo,

Nazirahmed

et al. 2024

JGR Oceans

View full text Add to dashboard Cite

show abstract

Fine-scale diazotroph community structure in the continental slope of the northern South China Sea

Liao,

Zhu,

Wang

et al. 2024

Marine Environmental Research

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High biological N fixation potential dominated by heterotrophic diazotrophs in alpine permafrost rivers on the Qinghai‒Tibet Plateau

Xin,

Gao,

Chen

et al. 2024

Water Research

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Nitrogen fixation under the interaction of Kuroshio and upwelling in the northeastern South China Sea

Cited by 4 publications

References 116 publications

Winter Convective Mixing Mediating Coupling of N‐Gain and ‐Loss in the Arabian Sea

Winter Convective Mixing Mediating Coupling of N‐Gain and ‐Loss in the Arabian Sea

Fine-scale diazotroph community structure in the continental slope of the northern South China Sea

High biological N fixation potential dominated by heterotrophic diazotrophs in alpine permafrost rivers on the Qinghai‒Tibet Plateau

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