Citation:

PANGAEA.941122

Name: Hydrochemistry measured on water bottle samples in the northern Benguela during SONNE cruise SO283
Published: 2022-02-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Angola-Benguela frontal zone; northern Benguela; nutrients

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Abstract:

We present data on distribution of inorganic nitrogen compounds i.e. nitrate, nitrite and ammonium, and also phosphate and silicate in the northern Benguela and the Angola-Benguela Front regions. The fieldwork took place during the cruise No. SO283 (March 19st - May 25st, 2021) onboard the R/V SONNE, which encompassed close-coastal and open ocean regions off Angola, Namibia and South Africa. All nutrient samples were retrieved with the ship's CTD rosette (SBE 9+). Immediately after sampling, a volume of about 40 ml of each sample was filtered through a disposable syringe filter (CA, 0.45 µm) and filled in a pre-rinsed 50 ml PE bottle. The bottles were securely closed and kept frozen at -20°C until further analysis. The concentrations of nutrients were determined colorimetrically after Grasshoff et al. (1999) using segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical) in the laboratory at IOW. For the quality control, a reference standard was also measured at regular intervals.

Keyword(s):

Angola-Benguela frontal zone; northern Benguela; nutrients

Related to:

Grasshoff, Klaus; Kremling, Klaus; Ehrhardt, M (1999): Methods of Seawater Analysis, Third Edition. Wiley-VCH, https://doi.org/10.1002/9783527613984.fmatter

Project(s):

The Benguela Upwelling System under climate change – Effects of VARiability in physical forcing on carbon and oxygen budgets (EVAR)

Coverage:

Median Latitude: -21.280559 * Median Longitude: 11.647655 * South-bound Latitude: -32.705200 * West-bound Longitude: -23.862600 * North-bound Latitude: 9.341600 * East-bound Longitude: 19.328000

Date/Time Start: 2021-03-29T09:04:00 * Date/Time End: 2021-05-05T01:11:00

Minimum DEPTH, water: 0 m * Maximum DEPTH, water: 3000 m

Event(s):

SO283_2-1 * Latitude: 9.341780 * Longitude: -23.862820 * Date/Time: 2021-03-29T09:04:00 * Location: South Atlantic Ocean * Campaign: * Basis: * Method/Device: (CTD-RO) * Comment: rope length max: 2000m

SO283_3-1 * Latitude: -4.572400 * Longitude: -19.328080 * Date/Time: 2021-04-01T08:36:00 * Location: South Atlantic Ocean * Campaign: * Basis: * Method/Device: (CTD-RO) * Comment: rope length max: 1000m

SO283_4-1 * Latitude: -19.903950 * Longitude: -7.934320 * Date/Time: 2021-04-05T08:59:00 * Elevation: -4258.3 m * Location: South Atlantic Ocean * Campaign: * Basis: * Method/Device: (CTD-RO) * Comment: rope length max: 2000m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Sabbaghzadeh, Bita
2	Station label	Station		Sabbaghzadeh, Bita
3	LATITUDE	Latitude		Sabbaghzadeh, Bita		Geocode
4	LONGITUDE	Longitude		Sabbaghzadeh, Bita		Geocode
5	Depth, bathymetric	Bathy depth	m	Sabbaghzadeh, Bita
6	DEPTH, water	Depth water	m	Sabbaghzadeh, Bita		Geocode
7	Sample ID	Sample ID		Sabbaghzadeh, Bita
8	Phosphate	[PO4]3-	µmol/l	Sabbaghzadeh, Bita	Segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical); Grasshoff et al., 1999
9	Nitrate	[NO3]-	µmol/l	Sabbaghzadeh, Bita	Segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical); Grasshoff et al., 1999
10	Nitrite	[NO2]-	µmol/l	Sabbaghzadeh, Bita	Segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical); Grasshoff et al., 1999
11	Ammonium	[NH4]+	µmol/l	Sabbaghzadeh, Bita	Segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical); Grasshoff et al., 1999
12	Silicate	Si(OH)4	µmol/l	Sabbaghzadeh, Bita	Segmented flow analyzer (QuAAtro AutoAnalyzer, Seal Analytical); Grasshoff et al., 1999

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

944 data points

Data

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

1 Event	2 Station	3 Latitude	4 Longitude	5 Bathy depth [m]	6 Depth water [m]	7 Sample ID	8 [PO4]3- [µmol/l]	9 [NO3]- [µmol/l]	10 [NO2]- [µmol/l]	11 [NH4]+ [µmol/l]	12 Si(OH)4 [µmol/l]
SO283_2-1	2	9.3416	-23.8626	5230.0	0	6	<0.100	<0.200	<0.050	<0.500	<1.000
SO283_2-1	2	9.3416	-23.8626	5230.0	35	7	<0.100	<0.200	<0.050	<0.500	<1.000
SO283_2-1	2	9.3416	-23.8626	5230.0	460	8	1.639	33.570	<0.050	<0.500	14.360
SO283_2-1	2	9.3416	-23.8626	5230.0	850	9	1.769	33.390	<0.050	<0.500	25.000
SO283_2-1	2	9.3416	-23.8626	5230.0	2000	10	1.045	16.120	<0.050	<0.500	21.170
SO283_3-1	3	-4.5723	19.3280	4800.0	0	11	<0.100	<0.200	<0.050	<0.500	<1.000
SO283_3-1	3	-4.5723	19.3280	4800.0	75	12	0.632	8.370	0.408	<0.500	3.160
SO283_3-1	3	-4.5723	19.3280	4800.0	400	13	2.054	31.530	<0.050	<0.500	14.860
SO283_3-1	3	-4.5723	19.3280	4800.0	750	14	2.073	32.730	<0.050	<0.500	27.390
SO283_3-1	3	-4.5723	19.3280	4800.0	1500	15	1.474	16.950	<0.050	<0.500	17.420
SO283_3-1	3	-4.5723	19.3280	4800.0	3000	16	1.037	10.760	<0.050	<0.500	20.510
SO283_4-1	4	-19.9040	7.9343	4268.0	0	17	0.214	<0.200	<0.050	<0.500	<1.000
SO283_4-1	4	-19.9040	7.9343	4268.0	110	18	0.203	<0.200	0.146	<0.500	1.335
SO283_4-1	4	-19.9040	7.9343	4268.0	700	19	2.282	32.640	<0.050	<0.500	25.700
SO283_4-1	4	-19.9040	7.9343	4268.0	1500	20	1.489	20.630	<0.050	<0.500	33.790
SO283_4-1	4	-19.9040	7.9343	4268.0	2000	21	1.560	17.610	0.249	<0.500	33.040
SO283_12-2	12	-32.7052	7.1252	4995.0	0	22	0.126	<0.200	0.221	<0.500	1.414
SO283_12-2	12	-32.7052	7.1252	4995.0	90	23	0.137	<0.200	0.215	<0.500	1.879
SO283_12-2	12	-32.7052	7.1252	4995.0	850	24	1.564	21.870	0.182	<0.500	17.450
SO283_12-2	12	-32.7052	7.1252	4995.0	1000	25	2.057	24.170	0.162	<0.500	27.970
SO283_12-2	12	-32.7052	7.1252	4995.0	3000	26	1.409	14.850	0.149	<0.500	38.340
SO283_16-1	16	-31.0410	15.2300	1291.0	0	27	0.112	<0.200	0.116	<0.500	1.764
SO283_16-1	16	-31.0410	15.2300	1291.0	70	28	0.547	5.269	0.246	<0.500	4.869
SO283_16-1	16	-31.0410	15.2300	1291.0	500	29	1.440	15.980	0.085	<0.500	10.990
SO283_16-1	16	-31.0410	15.2300	1291.0	760	30	1.721	25.150	0.067	<0.500	33.640
SO283_16-1	16	-31.0410	15.2300	1291.0	1273	31	1.979	25.150	0.053	<0.500	50.140
SO283_20-2	20	-30.6413	17.0170	166.0	0	32	0.320	1.689	0.082	<0.500	1.304
SO283_20-2	20	-30.6413	17.0170	166.0	10	33	0.554	3.813	0.158	<0.500	2.407
SO283_20-2	20	-30.6413	17.0170	166.0	30	34	1.360	15.650	0.099	<0.500	6.444
SO283_20-2	20	-30.6413	17.0170	166.0	100	35	1.343	15.340	<0.050	<0.500	8.727
SO283_20-2	20	-30.6413	17.0170	166.0	160	36	1.849	20.200	<0.050	<0.500	18.080
SO283_29-1	29	-23.0000	14.2147	108.0	0	48	0.498	1.928	0.074	0.947	<1.000
SO283_29-1	29	-23.0000	14.2147	108.0	30	49	1.271	13.690	0.207	<0.500	5.440
SO283_29-1	29	-23.0000	14.2147	108.0	50	50	1.519	15.720	0.129	<0.500	8.360
SO283_29-1	29	-23.0000	14.2147	108.0	70	51	2.138	5.823	4.915	1.740	26.420
SO283_29-1	29	-23.0000	14.2147	108.0	100	52	1.928	7.860	2.162	0.999	16.610
SO283_43-1	43	-22.9999	12.3302	2070.0	25	53	0.732	5.052	0.497	<0.500	1.093
SO283_43-1	43	-22.9999	12.3302	2070.0	75	54	1.102	11.260	<0.050	<0.500	4.656
SO283_43-1	43	-22.9999	12.3302	2070.0	180	55	1.049	10.520	<0.050	<0.500	4.891
SO283_43-1	43	-22.9999	12.3302	2070.0	400	56	1.973	22.790	<0.050	<0.500	13.540
SO283_47-2	47	-22.9750	12.6905	1155.0	5	57	0.386	1.968	<0.050	<0.500	1.118
SO283_47-2	47	-22.9750	12.6905	1155.0	200	58	1.654	18.850	<0.050	<0.500	9.222
SO283_47-2	47	-22.9750	12.6905	1155.0	400	59	2.387	35.220	<0.050	<0.500	18.310
SO283_47-2	47	-22.9750	12.6905	1155.0	600	60	2.401	36.130	<0.050	<0.500	23.120
SO283_47-2	47	-22.9750	12.6905	1155.0	1150	61	1.983	24.200	<0.050	<0.500	41.110
SO283_49-1	49	-17.2657	11.6983	53.0	5	62	0.626	3.297	0.327	0.518	3.544
SO283_49-1	49	-17.2657	11.6983	53.0	10	63	0.965	8.045	0.891	<0.500	9.490
SO283_49-1	49	-17.2657	11.6983	53.0	15	64	0.936	8.124	0.852	<0.500	9.093
SO283_49-1	49	-17.2657	11.6983	53.0	30	65	0.896	8.387	0.277	<0.500	5.238
SO283_49-1	49	-17.2657	11.6983	53.0	45	66	1.101	12.870	0.350	<0.500	7.990
SO283_50-1	50	-17.2657	11.5009	152.2	5	67	0.459	1.957	0.264	<0.500	1.996
SO283_50-1	50	-17.2657	11.5009	152.2	25	68	0.935	8.763	0.097	<0.500	3.621
SO283_50-1	50	-17.2657	11.5009	152.2	75	69	1.442	16.760	<0.050	<0.500	5.509
SO283_50-1	50	-17.2657	11.5009	152.2	120	70	1.193	11.030	0.092	<0.500	4.950
SO283_51-1	51	-17.2662	11.2747	505.0	25	71	0.267	<0.200	0.058	<0.500	1.530
SO283_51-1	51	-17.2662	11.2747	505.0	45	72	0.521	3.341	0.092	<0.500	1.424
SO283_51-1	51	-17.2662	11.2747	505.0	150	73	1.755	21.690	<0.050	<0.500	8.163
SO283_51-1	51	-17.2662	11.2747	505.0	250	74	1.799	22.520	<0.050	<0.500	9.407
SO283_51-1	51	-17.2662	11.2747	505.0	318	75	2.001	24.770	<0.050	<0.500	11.140
SO283_52-1	52	-17.2659	11.1493	1102.7	25	76	0.149	<0.200	<0.050	<0.500	<1.000
SO283_52-1	52	-17.2659	11.1493	1102.7	100	77	1.618	20.530	0.078	<0.500	6.950
SO283_52-1	52	-17.2659	11.1493	1102.7	200	78	1.367	16.090	<0.050	<0.500	5.935
SO283_52-1	52	-17.2659	11.1493	1102.7	300	79	1.690	18.100	<0.050	<0.500	8.091
SO283_52-1	52	-17.2659	11.1493	1102.7	600	80	2.308	33.630	<0.050	<0.500	19.640
SO283_55-1	55	-18.0000	11.2998	906.0	0	81	0.171	<0.200	<0.050	<0.500	<1.000
SO283_55-1	55	-18.0000	11.2998	906.0	34	82	0.395	0.851	0.171	<0.500	<1.000
SO283_55-1	55	-18.0000	11.2998	906.0	260	83	1.974	31.700	0.056	<0.500	10.920
SO283_55-1	55	-18.0000	11.2998	906.0	500	84	2.458	37.150	<0.050	<0.500	21.420
SO283_55-1	55	-18.0000	11.2998	906.0	896	85	2.418	34.510	<0.050	<0.500	34.030
SO283_99-1	99	-9.9830	9.6670	4414.0	0	119	<0.100	<0.200	<0.050	<0.500	3.240
SO283_99-1	99	-9.9830	9.6670	4414.0	420	120	2.107	36.750	<0.050	<0.500	15.870
SO283_99-1	99	-9.9830	9.6670	4414.0	800	121	2.353	37.130	<0.050	<0.500	29.860
SO283_99-1	99	-9.9830	9.6670	4414.0	1600	122	1.322	19.870	<0.050	<0.500	24.240
SO283_99-1	99	-9.9830	9.6670	4414.0	2000	123	1.481	18.840	<0.050	<0.500	27.240
SO283_99-1	26	-31.0337	16.9735	213.0	0	43	0.479	2.532	0.102	<0.500	1.507
SO283_99-1	26	-31.0337	16.9735	213.0	10	44	0.492	2.660	0.058	<0.500	<1.000
SO283_99-1	26	-31.0337	16.9735	213.0	75	45	1.244	14.150	0.163	<0.500	8.096
SO283_99-1	26	-31.0337	16.9735	213.0	100	46	1.519	15.650	0.059	<0.500	10.740
SO283_99-1	26	-31.0337	16.9735	213.0	210	47	2.045	19.710	0.063	<0.500	19.650
SO283_99-1	24	-31.4803	15.4355	1120.0	0	37	<0.100	<0.200	<0.050	<0.500	1.331
SO283_99-1	24	-31.4803	15.4355	1120.0	65	38	0.134	<0.200	<0.050	<0.500	1.549
SO283_99-1	24	-31.4803	15.4355	1120.0	150	39	0.362	3.661	<0.050	<0.500	2.024
SO283_99-1	24	-31.4803	15.4355	1120.0	500	40	1.595	18.460	<0.050	<0.500	12.300
SO283_99-1	24	-31.4803	15.4355	1120.0	670	41	2.098	24.170	<0.050	<0.500	26.280
SO283_99-1	24	-31.4803	15.4355	1120.0	1120	42	2.261	30.890	<0.050	<0.500	51.070
SO283_99-1	57	-25.0018	13.3335	1081.0	35	86	1.105	6.710	0.901	1.302	3.491
SO283_99-1	57	-25.0018	13.3335	1081.0	100	87	1.095	12.750	<0.050	<0.500	5.829
SO283_99-1	57	-25.0018	13.3335	1081.0	250	88	1.351	14.920	<0.050	<0.500	8.296
SO283_99-1	57	-25.0018	13.3335	1081.0	500	89	2.182	31.840	<0.050	<0.500	20.110
SO283_99-1	57	-25.0018	13.3335	1081.0	750	90	1.859	23.220	<0.050	<0.500	24.220
SO283_99-1	57	-25.0018	13.3335	1081.0	1064	91	2.146	25.130	<0.050	<0.500	40.800
SO283_99-1	58	-25.0032	13.9147	198.0	5	92	0.851	4.044	0.167	<0.500	1.753
SO283_99-1	58	-25.0032	13.9147	198.0	25	93	1.460	13.450	0.282	<0.500	6.513
SO283_99-1	58	-25.0032	13.9147	198.0	75	94	1.272	17.070	<0.050	<0.500	7.383
SO283_99-1	58	-25.0032	13.9147	198.0	120	95	2.078	21.790	<0.050	<0.500	15.790
SO283_99-1	58	-25.0032	13.9147	198.0	150	96	2.219	21.830	<0.050	<0.500	20.860
SO283_99-1	58	-25.0032	13.9147	198.0	170	97	2.447	21.210	<0.050	<0.500	25.110
SO283_99-1	60	-25.0002	14.3197	143.0	5	98	0.919	3.733	0.218	<0.500	1.881
SO283_99-1	60	-25.0002	14.3197	143.0	20	99	1.590	13.420	0.593	0.666	7.428
SO283_99-1	60	-25.0002	14.3197	143.0	40	100	1.409	13.370	<0.050	<0.500	6.892
SO283_99-1	60	-25.0002	14.3197	143.0	80	101	2.116	24.380	<0.050	<0.500	13.060
SO283_99-1	60	-25.0002	14.3197	143.0	120	102	2.075	15.570	0.095	<0.500	16.360
SO283_99-1	60	-25.0002	14.3197	143.0	130	103	2.334	3.139	2.026	1.381	22.010
SO283_99-1	68	-25.0000	14.4960	115.0	0	104	1.366	5.519	0.266	<0.500	2.314
SO283_99-1	68	-25.0000	14.4960	115.0	40	105	1.701	18.120	0.199	<0.500	8.627
SO283_99-1	68	-25.0000	14.4960	115.0	65	106	2.645	14.810	4.193	1.162	26.820
SO283_99-1	68	-25.0000	14.4960	115.0	90	107	2.697	9.907	2.913	1.795	29.870
SO283_99-1	68	-25.0000	14.4960	115.0	109	108	2.932	5.957	3.182	3.028	33.320
SO283_99-1	73	-25.0005	13.7308	313.0	5	109	0.564	2.605	0.080	<0.500	1.042
SO283_99-1	73	-25.0005	13.7308	313.0	55	110	0.817	7.589	<0.050	0.691	2.846
SO283_99-1	73	-25.0005	13.7308	313.0	125	111	1.168	12.820	<0.050	<0.500	5.782
SO283_99-1	73	-25.0005	13.7308	313.0	175	112	1.507	13.750	<0.050	<0.500	8.557
SO283_99-1	73	-25.0005	13.7308	313.0	225	113	1.915	20.060	<0.050	<0.500	14.210
SO283_99-1	73	-25.0005	13.7308	313.0	309	114	1.824	19.500	0.056	<0.500	13.300
SO283_99-1	75	-24.9992	13.5468	630.0	50	115	1.483	14.950	<0.050	<0.500	5.419
SO283_99-1	75	-24.9992	13.5468	630.0	250	116	1.703	21.420	<0.050	<0.500	11.270
SO283_99-1	75	-24.9992	13.5468	630.0	350	117	2.263	32.820	<0.050	<0.500	16.390
SO283_99-1	75	-24.9992	13.5468	630.0	500	118	2.402	34.860	<0.050	<0.500	22.060