Citation:

PANGAEA.817354

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Abstract:

The goal of this work has been to examine the influence of upper ocean food web structure and functioning on both the natural and artificially enhanced sequestration of carbon within the ocean. Data obtained in the mesocosm experiment run in the Bay of Hopavågen in August 2012 are used to assess the extent to which organic matter produced within four different food webs is retained in the upper ocean food web versus remineralized back to carbon dioxide and inorganic nutrients (ammonium, dissolved silicon, phosphate) versus exported from the system in the form of rapidly sinking particles. The experiment was carried out in a set of 12 mesocosms covering, in triplicate, 2 different phytoplankton communities (diatom versus non-diatom) exposed to 2 different zooplankton communities (-copepod and +copepod). These starting conditions were established by first filling the bags, roughly simultaneously, with seawater from the Bay of Hopavågen. Mesozooplankton were then removed to the most complete extent possible immediately removed from half of the mesocosms through repeated vertical hauls of a plankton net (200 µm mesh). Nitrate and phosphate was added to half mesocosms daily to promote the growth of non-siliceous phytoplankton (e.g. dinoflagellates or coccolithophores). To the other half of the mesocosms, nitrate, phosphate, and silicate were added to promote the growth of diatoms. Material was allowed to settle and the two distinct phytoplankton populations were allowed to develop for 4 days, after which copepods collected from the Bay of Hopavågen were added back to the half of the N+P mesocosms and to the half of the N+P+Si mesocosms from which mesozooplankton had not been removed at the beginning. This yielded a set of four initial starting conditions (N+P-copepods, N+P+copepods, N+P+Si-copepods, and N+P+Si+copepods). In the primary mesocosms, samples for a set of core parameters were taken every time the mesocosms were sampled. Samples for particulates (PIC, BSi, POC, PON) were collected on GF/F or 0.4 µm polycarbonate.

Project(s):

Basin Scale Analysis, Synthesis and Integration (EURO-BASIN)

Funding:

Seventh Framework Programme (FP7), grant/award no. 264933 : Basin Scale Analysis, Synthesis and Integration

Coverage:

Date/Time Start: 2012-08-02T00:00:00 * Date/Time End: 2012-08-26T00:00:00

Minimum DEPTH, water, experiment: 2.25 m * Maximum DEPTH, water, experiment: 2.25 m

Event(s):

HOPA-2012 * Date/Time Start: 2012-08-02T00:00:00 * Date/Time End: 2012-08-26T00:00:00 * Location: Norwegian fjord * Method/Device: Mesocosm experiment (MESO) * Comment: Mesocosm experiment conducted in the Bay of Hopavaagen at the Sletvik field station

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experiment	Exp
2	Treatment: duration	T:duration	days
3	DEPTH, water, experiment	Depth water exp	m			Geocode
4	Depth, top/min	Depth top	m
5	Depth, bottom/max	Depth bot	m
6	Carbon, organic, particulate	POC	µmol/l	De La Rocha, Christina L	Element analyzer, Thermo Quest Flash 1112
7	Nitrogen, organic, particulate	PON	µmol/l	De La Rocha, Christina L	Spectrophotometer Shimadzu UV-1700
8	Biogenic silica	bSiO2	µmol/l	De La Rocha, Christina L	Colorimetry
9	Chlorophyll a	Chl a	µg/l	De La Rocha, Christina L	High Performance Liquid Chromatography (HPLC)
10	Carbon, organic, dissolved	DOC	µmol/l	De La Rocha, Christina L	TOC analyzer (Shimadzu)
11	Nitrogen, organic, dissolved	DON	µg/l	De La Rocha, Christina L	TOC analyzer (Shimadzu)
12	Nitrate	[NO3]-	µmol/l	De La Rocha, Christina L	Technicon Autoanalyser (Tréguer & Le Corre, 1975)
13	Nitrite	[NO2]-	µmol/l	De La Rocha, Christina L	Technicon Autoanalyser (Tréguer & Le Corre, 1975)
14	Ammonium	[NH4]+	µmol/l	De La Rocha, Christina L	Spectrophotometer Shimadzu UV-1700
15	Phosphate	[PO4]3-	µmol/l	De La Rocha, Christina L	Technicon Autoanalyser (Tréguer & Le Corre, 1975)
16	Silicate	Si(OH)4	µmol/l	De La Rocha, Christina L	Technicon Autoanalyser (Tréguer & Le Corre, 1975)
17	Experimental treatment	Exp treat		De La Rocha, Christina L

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

1142 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Exp	2 T:duration [days]	3 Depth water exp [m]	5 Depth bot [m]	6 POC [µmol/l]	7 PON [µmol/l]	8 bSiO2 [µmol/l]	9 Chl a [µg/l]	10 DOC [µmol/l]	11 DON [µg/l]	12 [NO3]- [µmol/l]	13 [NO2]- [µmol/l]	14 [NH4]+ [µmol/l]	15 [PO4]3- [µmol/l]	16 Si(OH)4 [µmol/l]	17 Exp treat
Mesocosm 1	1	2.25	4.5	26.3	4.3	1.68	1.10	179	7.2	0.15	0.03	0.12	0.04	0.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 1	3	2.25	4.5	21.1	3.6	2.38	0.36	110	7.7	0.04	0.04	0.17	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 1	6	2.25	4.5	18.3	3.4	1.12	0.18	138	8.2	0.07	0.04	0.33	0.07	0.3	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 1	10	2.25	4.5	10.1	1.8	0.24	0.31	135	8.1	0.48	0.02	0.71	0.10	1.8	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 1	13	2.25	4.5	11.2	1.9	0.24	0.17	156	7.2	1.00	0.03	0.22	0.09	2.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 1	16	2.25	4.5	14.3	2.7	0.25	0.31	164	7.0	1.23	0.02	0.22	0.04	2.8	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	1	2.25	4.5	29.9	3.8	1.77	0.93	197	6.3	0.24	0.03	0.20	0.01	0.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	3	2.25	4.5	16.9	3.0	1.78	0.34	111	7.1	0.06	0.04	0.31	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	6	2.25	4.5	14.0	3.2	0.56	0.15	199	6.8	0.55	0.04	0.35	0.07	0.4	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	10	2.25	4.5	14.9	2.6	0.63	0.54	124	8.0	0.39	0.02	0.39	0.10	1.6	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	13	2.25	4.5	16.1	3.0	0.60	0.52	115	7.6	0.00	0.03	0.17	0.06	1.6	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 2	16	2.25	4.5	21.5	3.5	1.36	0.86	112	8.6	0.11	0.01	0.02	0.07	0.5	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	1	2.25	4.5	34.0	4.0	1.04	0.96	188	6.4	0.10	0.02	0.20	0.00	0.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	3	2.25	4.5	21.0	3.6	2.54	0.40	108	7.0	0.07	0.02	0.13	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	6	2.25	4.5	19.8	4.5	1.36	0.13	162	8.1	0.00	0.03	0.21	0.04	0.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	10	2.25	4.5	12.8	2.5	0.26	0.39			0.47	0.02	0.91	0.09	1.7	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	13	2.25	4.5	13.1	2.3	0.25	0.25	125	6.8	0.74	0.02	0.26	0.09	2.3	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 3	16	2.25	4.5	17.0	3.3	0.26	0.41	172	7.7	1.06	0.01	0.16	0.08	2.7	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	1	2.25	4.5	34.2	4.0	2.08	0.88	201	7.0	0.11	0.02	0.18	0.02	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	3	2.25	4.5	19.0	3.0	1.68	0.45	111	7.6	0.09	0.03	0.48	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	6	2.25	4.5	11.4	2.1	0.50	0.21	216	7.7	0.32	0.04	0.40	0.06	0.3	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	10	2.25	4.5	18.6	3.5	0.39	1.07	124	8.0	0.00	0.02		0.07	1.7	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	13	2.25	4.5	25.5	5.0	0.48	0.93	133	6.2	0.00	0.02	0.27	0.08	2.3	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 4	16	2.25	4.5	26.2	5.0	0.92	1.04	181	7.6	0.17	0.01	0.13	0.06	2.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	1	2.25	4.5	34.1	4.1	1.84	0.71	186	6.5	0.09	0.03	0.44	0.02	0.4	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	3	2.25	4.5	22.3	4.3	2.35	0.52	127	9.7	0.09	0.02	0.49	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	6	2.25	4.5	20.5	3.7	1.51	0.23	134	7.8	0.00	0.03	0.23	0.07	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	10	2.25	4.5	18.6	3.6	1.07	0.31	125	8.1	0.00	0.02	0.34	0.06	0.9	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	13	2.25	4.5	26.5	5.0	1.43	1.06	163	6.6	0.00	0.03	0.30	0.09	0.7	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 5	16	2.25	4.5	25.7	5.1	1.62	1.37	203	6.4	0.13	0.00	0.11	0.11	0.8	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	1	2.25	4.5	43.5	5.6	2.18	0.61	167	7.7	0.11	0.03	0.22	0.05	0.2	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	3	2.25	4.5	23.0	3.3	2.51	0.41	118	8.8	0.08	0.03	0.35	0.03	0.1	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	6	2.25	4.5	33.9	6.1	2.33	0.11	180	9.4	0.06	0.04	0.14	0.06	0.0	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	10	2.25	4.5	16.7	3.2	0.74	0.75	243	7.4	0.00	0.03	0.28	0.06	0.8	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	13	2.25	4.5	21.5	5.2	1.16	0.81	111	6.6	0.00	0.03	0.25	0.08	0.8	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 6	16	2.25	4.5	23.9	3.2	2.11	1.01	107	6.9	0.03	0.00	0.03	0.07	0.0	0.21 µM silicate, 0.014 µM phosphate, and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	1	2.25	4.5	22.7	3.6	0.89	0.40	195	8.4	0.08	0.03	0.21		0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	3	2.25	4.5	21.0	3.6	0.46	0.24	128	8.9	0.47	0.04	0.48	0.06	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	6	2.25	4.5	12.4	2.3	0.08	0.09	166	8.5	1.61	0.03	0.79	0.16	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	10	2.25	4.5	8.7	1.6	0.08	0.20			2.33	0.02	0.72	0.18	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	13	2.25	4.5	10.2	2.7	0.08	0.24	272	7.9	2.43	0.03	0.46	0.20	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 7	16	2.25	4.5	15.4	3.0	0.07	0.32	163	7.6	1.38	0.02	0.30	0.12	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	1	2.25	4.5	24.4	4.4	0.83	0.45	179	6.6	0.08	0.03	0.20	0.05	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	3	2.25	4.5	16.6	2.8	0.55	0.32	111	6.7	0.26	0.04	0.30	0.06	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	6	2.25	4.5	11.8	3.0	0.10	0.13	163	9.5	1.52	0.04	0.75	0.14	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	10	2.25	4.5	6.9	1.1	0.07	0.19	153	7.7	2.46	0.03	0.83	0.19	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	13	2.25	4.5	9.2	2.0	0.05	0.29	144	5.8	2.39	0.03	0.35	0.19	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 8	16	2.25	4.5	16.7	3.9	0.09	0.69			1.31	0.02	0.16	0.13	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	1	2.25	4.5	17.8	3.2	0.99	0.52	164	7.6	0.28	0.03	0.34	0.06	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	3	2.25	4.5	14.8	2.9	0.69	0.49	138	7.6	0.37	0.03	0.85	0.12	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	6	2.25	4.5	9.6	1.9	0.10	0.13	160	6.9	1.48	0.04	0.89	0.18	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	10	2.25	4.5	12.8	2.5	0.15	1.05	115	8.1	2.07	0.03	1.02	0.19	0.3	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	13	2.25	4.5	13.2	2.6	0.03	0.38	113	6.3	0.97	0.03	1.16	0.16	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 9	16	2.25	4.5	14.7	3.1	0.06	0.41	100	7.4	1.78	0.05	0.50	0.15	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	1	2.25	4.5	24.9	4.6	0.82	0.59	134	7.4	0.25	0.03	0.67	0.09	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	3	2.25	4.5	18.9	3.3	0.54	0.68	118	6.9	0.28	0.03	0.37	0.07	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	6	2.25	4.5	18.6	3.3	0.28	0.53	187	5.8	0.61	0.05	0.24	0.09	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	10	2.25	4.5	23.6	4.3	0.20	0.60	247	8.9	0.52	0.03	0.41	0.10	0.4	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	13	2.25	4.5	14.6	2.9	0.20	0.55	116	8.2	0.67	0.03	0.50	0.10	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 10	16	2.25	4.5	19.9	3.8	0.12	0.47	243	7.3	1.60	0.01	0.42	0.12	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	1	2.25	4.5	23.8	4.5	1.03	0.53	177	6.9	0.08	0.02	0.19	0.07	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	3	2.25	4.5	21.3	6.0	0.73	0.57	107	7.7	0.16	0.03	0.22	0.04	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	6	2.25	4.5	22.7	4.3	0.60	0.32			0.75	0.03	0.47	0.11	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	10	2.25	4.5	18.5	3.6	0.27	0.43	119	9.6	1.45	0.03	0.93	0.16	0.3	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	13	2.25	4.5	16.3	4.2	0.07	0.72	138	6.3	1.22	0.03	0.52	0.11	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 11	16	2.25	4.5	25.9	4.9	0.08	0.87	173	6.7	0.87	0.02	0.25	0.11	0.2	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	1	2.25	4.5	28.4	4.6	0.97	0.47	201	9.8	0.07	0.02	0.23	0.03	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	3	2.25	4.5	18.1	3.5	0.54	0.43	111	6.5	0.18	0.03	0.42	0.04	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	6	2.25	4.5	26.0	5.4	0.31	0.25	200	9.2	0.72	0.04	0.45	0.12	0.0	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	10	2.25	4.5	16.1	3.1	0.16	0.64	194	8.3	1.29	0.03	0.52	0.13	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	13	2.25	4.5	15.9	3.1	0.07	0.52	109	6.4	1.29	0.03	0.30	0.10	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm
Mesocosm 12	16	2.25	4.5	24.9	4.5	0.09	0.76	237	7.7	0.52	0.01	0.11	0.05	0.1	0.014 µM phosphate and 0.22 µM nitrate were added daily to this mesocosm