Effects of ammonium effluents on planktonic primary production and decomposition in a coastal brackish water environment I. Nutrient balance of the water body and effluent tests

Tamminen, Timo

doi:10.1016/0077-7579(82)90050-3

Cited by 11 publications

(7 citation statements)

References 10 publications

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“…The loading depicts how strongly the variable affects the structure of the component. The connection between the first principal component and both phyto-and bacterioplankton growth and total nitrogen and NH, indicates the key role of nitrogen for plankton communities in the Baltic Sea (Tamminen 1982, Tamminen et al 1985. The second principal component expressed the size of the bacterial population and was positively correlated with dissolved oxygen and NO3 and negatively correlated with temperature and total phosphorus.…”

Section: Relationships Between Parametersmentioning

confidence: 98%

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

Heinänen¹

1991

Mar. Ecol. Prog. Ser.

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Bacterial numbers, biomass and productivity were studied during 2 cruises in the Baltic Proper, Gulf of Finland and the Bothnian Sea. Bacterial populations in the open sea area had longer turnover times and lower productivity than in coastal areas, comparable to those found in the open ocean, but their biomass and abundance were as high as in the coastal areas of the Baltic Sea. High bacterial productivity in the aphotic water layer in the Gulf of Finland is suggested to indicate eutrophication of this area.

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Section: Relationships Between Parametersmentioning

confidence: 98%

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

Heinänen¹

1991

Mar. Ecol. Prog. Ser.

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“…where k O 2 is the weighted gas transfer velocity of O 2 (m d −1 ); [O 2 ] sat denotes the saturation concentration of dissolved O 2 (µmol kg −1 ) in the mixed layer, which is calculated based on temperature and salinity (Weiss, 1970); r C : O 2 is the photosynthetic quotient of C and O 2 and was reported as 1 : 1.38 in the SCS (Jiang et al, 2011); and ρ is seawater density in units of kilograms per cubic meter (kg m −3 ) (Millero and Poisson, 1981). We estimated k O 2 using the European Centre for Medium-Range Weather Forecasts (ECMWF) wind-speed reanalysis data product with a 0.25 • × 0.25 • grid (https://www.ecmwf.int, last access: 18 April 2020), the parameterization by Wanninkhof (1992), and the gas exchange weighting algorithm by Teeter et al (2018). Teeter et al (2018) pointed out that the modern O 2 /Ar method does not strongly rely on the steady-state assumption.…”

Section: Estimation Of Ncp Based On O 2 /Ar Measurementsmentioning

confidence: 99%

High-resolution distributions of O<sub>2</sub> / Ar on the northern slope of the South China Sea and estimates of net community production

et al. 2021

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Abstract. The dissolved oxygen-to-argon ratio (O2∕Ar) in the oceanic mixed layer has been widely used to estimate net community production (NCP), which is the difference between gross primary production and community respiration; it is a measure of the strength of the biological pump. In order to obtain the high-resolution distribution of NCP and improve our understanding of its regulating factors in the slope region of the northern South China Sea (SCS), we conducted continuous measurements of dissolved O2, Ar, and CO2 with membrane inlet mass spectrometry (MIMS) during two cruises in October 2014 and June 2015. An overall autotrophic condition was observed in the study region in both cruises with an average Δ(O2∕Ar) of 1.1 % ± 0.9 % in October 2014 and 2.7 % ± 2.8 % in June 2015. NCP was on average 11.5 ± 8.7 mmol C m−2 d−1 in October 2014 and 11.6 ± 12.7 mmol C m−2 d−1 in June 2015. Correlations between dissolved inorganic nitrogen (DIN), Δ(O2∕Ar), and NCP were observed in both cruises, indicating that NCP is subject to the nitrogen limitation in the study region. In June 2015, we observed a rapid response of the ecosystem to the episodic nutrient supply induced by eddies. Eddy-entrained shelf water intrusion, which supplied large amounts of terrigenous nitrogen to the study region, promoted NCP in the study region by potentially more than threefold. In addition, upwelling brought large uncertainties to the estimation of NCP in the core region of the cold eddy (cyclone) in June 2015. The deep euphotic depth in the SCS and the absence of correlation between NCP and the average photosynthetically available radiation (PAR) in the mixed layer in the autumn indicate that light availability may not be a significant limitation on NCP in the SCS. This study helps us to understand the carbon cycle in the highly dynamic shelf system.

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“…The excretion of zooplankton and the bacterial decomposition of organic matter were considered to be the main mechanisms for the release of NH4 + into the surface water (La Roche, 1983;Clark et al, 2008). Ammonium is an important nitrogen source of phytoplankton growth, which can be quickly utilized by phytoplankton, and contributes to primary production (Dugdale and Goering, 1967;Tamminen, 1982). Though we only got nutrient data at two CTD stations in this transect, the result partly indicated that higher ammonium could result in higher Δ(O2/Ar) and NCP.…”

Section: Distribution Of Various Parameters Along Representative Tranmentioning

confidence: 99%

High-resolution distributions of O<sub>2</sub>/Ar on the northern slope of the South China Sea and estimates of net community production

Qin¹,

Zhang²,

Zheng³

et al. 2020

Preprint

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Abstract. Net community production (NCP) is a proxy of carbon export from the surface ocean and can be estimated based on O2/Ar. In order to obtain the high-resolution distribution of NCP and improve our understanding of its regulating factors in the slope region of the Northern South China Sea (SCS), we conducted continuous measurements of dissolved O2, Ar, and CO2 by membrane inlet mass spectrometry during cruises in October 2014 and June 2015. An overall autotrophic condition was observed in the study region in both cruises with an average ∆(O2/Ar) of 1.1 % ± 0.9 % in October 2014 and 2.7 % ± 2.8 % in June 2015. NCP was on average 11.5 ± 8.7 mmol C m−2 d−1 in October 2014 and 11.6 ± 12.7 mmol C m−2 d−1 in June 2015. Correlations between dissolved inorganic nitrogen (DIN), ∆(O2/Ar), and NCP were observed in both cruises, indicating that NCP is subject to the nitrogen limitation in the study region. In June 2015, we observed a rapid response of the ecosystem to the episodic nutrient supply induced by eddies. Eddy-entrained shelf water injection, which supplied large amounts of terrigenous nitrogen to the study region, resulted in high productivity along a transect. In addition, upwelling brought large uncertainties to the estimation of NCP at the core region of the cold eddy (cyclone) in June 2015. The correlation between the volumetric NCP (NCPvol) and the mixed layer depth (MLD) indicated that light availability may have also been a factor in influencing NCP in the SCS.

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Effects of ammonium effluents on planktonic primary production and decomposition in a coastal brackish water environment I. Nutrient balance of the water body and effluent tests

Cited by 11 publications

References 10 publications

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

High-resolution distributions of O<sub>2</sub> / Ar on the northern slope of the South China Sea and estimates of net community production

High-resolution distributions of O<sub>2</sub>/Ar on the northern slope of the South China Sea and estimates of net community production

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Effects of ammonium effluents on planktonic primary production and decomposition in a coastal brackish water environment I. Nutrient balance of the water body and effluent tests

Cited by 11 publications

References 10 publications

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

High-resolution distributions of O&lt;sub&gt;2&lt;/sub&gt; / Ar on the northern slope of the South China Sea and estimates of net community production

High-resolution distributions of O&lt;sub&gt;2&lt;/sub&gt;/Ar on the northern slope of the South China Sea and estimates of net community production

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High-resolution distributions of O<sub>2</sub> / Ar on the northern slope of the South China Sea and estimates of net community production

High-resolution distributions of O<sub>2</sub>/Ar on the northern slope of the South China Sea and estimates of net community production