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Nausch, Monika (2016): KOSMOS Finland 2012 mesocosm study: Phosphorus pool sizes and uptake. Leibniz Institute for Baltic Sea Research, Warnemünde, PANGAEA, (unpublished dataset), Supplement to: Nausch, Monika; Bach, Lennart Thomas; Czerny, Jan; Goldstein, S J; Grossart, Hans-Peter; Hellemann, Dana; Hornick, Thomas; Achterberg, Eric Pieter; Schulz, Kai Georg; Riebesell, Ulf (2016): Effects of CO2 perturbation on phosphorus pool sizes and uptake in a mesocosm experiment during a low productive summer season in the northern Baltic Sea. Biogeosciences, 13(10), 3035-3050,

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Studies investigating the effect of increasing CO2 levels on the phosphorus cycle in natural waters are lacking although phosphorus often controls phytoplankton development in many aquatic systems. The aim of our study was to analyse effects of elevated CO2 levels on phosphorus pool sizes and uptake. The phosphorus dynamic was followed in a CO2-manipulation mesocosm experiment in the Storfjärden (western Gulf of Finland, Baltic Sea) in summer 2012 and was also studied in the surrounding fjord water. In all mesocosms as well as in surface waters of Storfjärden, dissolved organic phosphorus (DOP) concentrations of 0.26 ± 0.03 and 0.23 ± 0.04 µmol/l, respectively, formed the main fraction of the total P-pool (TP), whereas phosphate (PO4) constituted the lowest fraction with mean concentration of 0.15 ± 0.02 in the mesocosms and 0.17 ± 0.07 µmol/l in the fjord. Transformation of PO4 into DOP appeared to be the main pathway of PO4 turnover. About 82% of PO4 was converted into DOP whereby only 18% of PO4 was transformed into particulate phosphorus (PP). PO4 uptake rates measured in the mesocosms ranged between 0.6 and 3.9 nmol/l/h. About 86% of them was realized by the size fraction < 3 µm. Adenosine triphosphate (ATP) uptake revealed that additional P was supplied from organic compounds accounting for 25-27% of P provided by PO4 only. CO2 additions did not cause significant changes in phosphorus (P) pool sizes, DOP composition, and uptake of PO4 and ATP when the whole study period was taken into account. However, significant short-term effects were observed for PO4 and PP pool sizes in CO2 treatments > 1000 µatm during periods when phytoplankton biomass increased. In addition, we found significant relationships (e.g., between PP and Chl a) in the untreated mesocosms which were not observed under high fCO2 conditions. Consequently, it can be hypothesized that the relationship between PP formation and phytoplankton growth changed with CO2 elevation. It can be deduced from the results, that visible effects of CO2 on P pools are coupled to phytoplankton growth when the transformation of PO4 into POP was stimulated. The transformation of PO4 into DOP on the other hand does not seem to be affected. Additionally, there were some indications that cellular mechanisms of P regulation might be modified under CO2 elevation changing the relationship between cellular constituents.
Latitude: 59.858330 * Longitude: 23.258330
Date/Time Start: 2012-06-12T00:00:00 * Date/Time End: 2012-06-12T00:00:00
KOSMOS_2012_Tvaerminne * Latitude: 59.858330 * Longitude: 23.258330 * Date/Time: 2012-06-12T00:00:00 * Method/Device: Mesocosm experiment (MESO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Day of experimentDOEdayNausch, Monika
2Mesocosm labelMeso labelNausch, Monika
3PhasePhaseNausch, Monika
4Phosphorus, totalTPµmol/lNausch, Monika
5Phosphorus, total dissolvedTDPµmol/lNausch, Monika
6Phosphorus, organic, particulatePOPµmol/lNausch, Monika
7Phosphorus, organic, dissolvedDOPµmol/lNausch, Monika
8Phosphate[PO4]3-µmol/lNausch, Monika
9PhosphatePO4%Nausch, Monika% of TP
10Phosphorus, organic, particulatePOP%Nausch, Monika% of TP
11Phosphorus, organic, dissolvedDOP%Nausch, Monika% of TP
12Adenosine triphosphate per volumeATP per volnmol/lNausch, Monika
13Phosphorus, adenosine triphosphate, dissolveddATP-Pnmol/lNausch, Monika
14Phosphorus, adenosine triphosphate, dissolveddATP-P%Nausch, Monika% of DOP
15Phosphorus, phospholipid, dissolveddPL-Pnmol/lNausch, Monika
16PhospholipidsPLµg/lNausch, Monika
17Phosphorus, phospholipid, dissolveddPL-P%Nausch, Monika% of DOP
18Deoxyribonucleic acid per volumeDNA per volµg/lNausch, Monika
19Ribonucleic acid per volumeRNA per volµg/lNausch, Monika
20Phosphorus, deoxyribonucleic acid, dissolveddDNA-Pnmol/lNausch, Monika
21Phosphorus, ribonucleic acid, dissolveddRNA-Pnmol/lNausch, Monika
22Phosphorus, deoxyribonucleic acid, dissolveddDNA-P%Nausch, Monika% of DOP
23Phosphorus, ribonucleic acid, dissolveddRNA-P%Nausch, Monika% of DOP
24--Nausch, Monika
25Phosphorus uptake rateP upt ratenmol/l/hNausch, Monikauptake by the whole plankton community
26Phosphorus uptake rate, fractionatedP upt rate fracnmol/l/hNausch, Monikauptake by plankton fraction >3µm
27Phosphorus uptake rate, fractionatedP upt rate fracnmol/l/hNausch, Monikauptake by plankton fraction <3µm
28Size fractionFraction%Nausch, Monika<3µm
29--Nausch, Monika
30Adenosine triphosphate uptake rateATP uptake ratenmol/l/hNausch, Monikauptake by the whole plankton community
31Phosphorus, adenosine triphosphate, uptake ratedATP-P uptake ratenmol/l/hNausch, Monikauptake by the whole plankton community
32Adenosine triphosphate uptake rate, fractionatedATP uptake rate fracnmol/l/hNausch, Monikauptake by plankton fraction >3µm
33Adenosine triphosphate uptake rate, fractionatedATP uptake rate fracnmol/l/hNausch, Monikauptake by plankton fraction <3µm
34Size fractionFraction%Nausch, Monika<3µm
3500 data points

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