Active and passive fluxes of carbon, nitrogen, and phosphorus in the northern South China Sea

This paper presents the measured active and passive fluxes of carbon (C), nitrogen (N), and phosphorus (P) and their response to seasonal and event-driven oceanographic changes in the northern South China Sea (NSCS). The total vertical flux of carbon (TFC) is defined as the sum of active and passive...

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Bibliographic Details
Published in:Biogeosciences 2021-09, Vol.18 (18), p.5141-5162
Main Authors: Hung, Jia-Jang, Tung, Ching-Han, Lin, Zong-Ying, Chen, Yuh-ling Lee, Peng, Shao-Hung, Lin, Yen-Huei, Tsai, Li-Shan
Format: Article
Language:English
Subjects:
Approximation
Availability
Carbon cycle
Carbon dioxide
Chlorophyll
Chlorophyll a
Climatic conditions
Current rings
Eddies
Euphotic zone
Fluctuations
Fluxes
Mineral nutrients
Nitrogen
Nutrient availability
Nutrients
Oceans
Phosphorus
Plankton
Respiration
Seasonal variability
Seasonal variation
Seasonal variations
Stratification
Summer
Surface boundary layer
Surface layers
Surface temperature
Turbulence
Vertical flux
Wind
Wind effects
Winter
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Summary:This paper presents the measured active and passive fluxes of carbon (C), nitrogen (N), and phosphorus (P) and their response to seasonal and event-driven oceanographic changes in the northern South China Sea (NSCS). The total vertical flux of carbon (TFC) is defined as the sum of active and passive fluxes of biogenic carbon in the surface layer, which may be considered as the central part of marine carbon cycle. These active and passive fluxes of N and P were also considered to understand stoichiometric flux patterns and the roles of nutrients involved in the TFC. The magnitudes of total C, N, and P fluxes were, respectively, estimated to be 71.9–347 (mean ± SD, 163 ± 70) mgCm-2d-1, 13.0–30.5 (21.2.± 4.9) mgNm-2d-1, and 1.02–2.97 (1.94 ± 0.44) mgPm-2d-1, which were higher than most previously reported vertical fluxes in open oceans, likely because a quarter of the fluxes was contributed from active fluxes that were unaccounted for in vertical fluxes previously. Moreover, the passive fluxes dominated the total vertical fluxes and were estimated to be 65.3–255 (125 ± 64.9) mgCm-2d-1 (77 ± 52 % of total C flux), 11.9–23.2 (17.6 ± 4.2) mgNm-2d-1 (83 ± 28 % of total N flux), and 0.89–1.98 (1.44 ± 0.33) mgPm-2d-1 (74 ± 24 % of total P flux). Vertical fluxes of dissolved organic C, N, and P were small (
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-18-5141-2021