Citation:

meps220025

Name: Biogeochemical data from surface sediments in the Porcupine Abyssal Plain
Published: 2001
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

We investigated spatial and temporal changes in quantity, quality and bioavailability of organic matter in abyssal sediments of the northeastern Atlantic. Sediment samples were collected in the Porcupine Abyssal Plain (PAP, 4800 m depth) during 6 oceanographic cruises from September 1996 to October 1998 down to a depth of 15 cm. Sedimentary proteins, carbohydrates and lipids, and their enzymatically hydrolysable fractions showed significant temporal changes, but different biochemical classes displayed different temporal patterns. Total proteins, carbohydrates and lipids displayed high concentrations, whereas the potentially hydrolysable fractions accounted for only about 10% of their total pools. From September 1996 to October 1998, bioavailable organic carbon concentration in the sediments decreased about 10 gC/m**2 indicating that this benthic system was not steady state. Hydrolysed proteins and carbohydrates were characterised by different vertical patterns. Carbohydrates increased their relative significance with depth in the sediment indicating a shift of organic matter bioavailability with important trophodynamic implications for subsurface consumers. Vertical profiles of reactive and refractory organic carbon in PAP sediments indicate that organic matter bioavailability in deeper sediment layers is higher than expected from previous theoretical models.

Coverage:

Latitude: 48.800000 * Longitude: -16.500000

Minimum DEPTH, sediment/rock: 0.015 m * Maximum DEPTH, sediment/rock: 0.125 m

Event(s):

PAP * Latitude: 48.800000 * Longitude: -16.500000 * Elevation: -4775.0 m * Location: Porcupine Abyssal Plain * Method/Device: Multiple investigations (MULT) * Comment: This location corresponds to the center of PAP/BENGAL/OMEX sites.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DEPTH, sediment/rock	Depth sed	m		Geocode
2	Depth, top/min	Depth top	m	Danovaro, Roberto
3	Depth, bottom/max	Depth bot	m	Danovaro, Roberto
4	Comment	Comment		Danovaro, Roberto
5	Carbohydrates, total	CHO tot	µg/g	Danovaro, Roberto
6	Carbohydrates, total, standard deviation	CHO tot std dev	±	Danovaro, Roberto
7	Carbohydrates, hydrolyzable	CHO hydrolyz	µg/g	Danovaro, Roberto
8	Carbohydrates, hydrolyzable, standard deviation	CHO hydrolyz std dev	±	Danovaro, Roberto
9	Lipids, total	Lipids tot	µg/g	Danovaro, Roberto
10	Lipids, total, standard deviation	Lipids tot std dev	±	Danovaro, Roberto
11	Proteins, total	TPRT	µg/g	Danovaro, Roberto
12	Proteins, total, standard deviation	TPRT std dev	±	Danovaro, Roberto
13	Proteins, hydrolyzable	Protein hydrol	µg/g	Danovaro, Roberto
14	Proteins, hydrolyzable, standard deviation	Protein hydol std dev	±	Danovaro, Roberto

License:

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

Size:

380 data points

Data

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

1 Depth sed [m]	2 Depth top [m]	3 Depth bot [m]	4 Comment	5 CHO tot [µg/g]	6 CHO tot std dev [±]	7 CHO hydrolyz [µg/g]	8 CHO hydrolyz std dev [±]	9 Lipids tot [µg/g]	10 Lipids tot std dev [±]	11 TPRT [µg/g]	12 TPRT std dev [±]	13 Protein hydrol [µg/g]	14 Protein hydol std dev [±]
0.025	0.00	0.05	Sep 1996	1601	85	209.1	32.0	0.412	0.010	1.42	0.02	335.3	20.2
0.015	0.01	0.02	Sep 1996	1588	56	151.6	15.9	0.127	0.022	0.91	0.26	110.4	31.1
0.035	0.03	0.04	Sep 1996	1765	90	157.8	5.4	0.106	0.012	0.65	0.02	131.2	23.6
0.055	0.05	0.06	Sep 1996	1655	150	104.0	25.3	0.093	0.009	1.03	0.14	123.6	37.3
0.125	0.10	0.15	Sep 1996	929	9	131.7	12.4	0.054	0.015	0.27	0.11
0.025	0.00	0.05	Mar 1997	1382	56	227.1	10.2	0.140	0.020	0.91	0.32	121.4	38.0
0.015	0.01	0.02	Mar 1997	1647	66	220.4	1.8	0.075	0.021	0.58	0.20	118.9	17.2
0.035	0.03	0.04	Mar 1997	1630	57	211.8	20.2	0.043	0.004	0.66	0.01	38.7	16.2
0.055	0.05	0.06	Mar 1997	1627	150	162.6	10.6	0.048	0.006	0.50	0.03	84.5	27.2
0.125	0.10	0.15	Mar 1997	1028	114	142.0	3.2	0.036	0.001	0.30	0.06	19.8	17.2
0.025	0.00	0.05	Jul 1997	1194	172	102.2	10.9	0.300	0.036	0.61	0.08	36.1	36.5
0.015	0.01	0.02	Jul 1997	1386	94	101.8	4.6	0.138	0.007	0.54	0.07	99.1	11.4
0.035	0.03	0.04	Jul 1997	1254	44	144.3	1.1	0.111	0.022	0.45	0.07	22.6	8.6
0.055	0.05	0.06	Jul 1997	894	188	104.7	1.0	0.081	0.013	0.45	0.02	23.6	23.8
0.125	0.10	0.15	Jul 1997	1022	17	86.5	0.4	0.073	0.010	0.38	0.00
0.025	0.00	0.05	Oct 1997	1557	175	138.2	4.2	0.184	0.011	1.05	0.06	33.2	21.9
0.015	0.01	0.02	Oct 1997	1145	390	70.0	12.3	0.118	0.015	0.78	0.04	11.3	2.9
0.035	0.03	0.04	Oct 1997	1461	72	96.2	10.3	0.092	0.016	0.52	0.00	49.1	14.3
0.055	0.05	0.06	Oct 1997	1397	307	70.2	11.7	0.053	0.003	0.60	0.05	66.1	66.7
0.125	0.10	0.15	Oct 1997	1395	12	68.8	18.1	0.043	0.004	0.28	0.01
0.025	0.00	0.05	Mar 1998	2210	40	111.9	2.5	0.631	0.041	1.19	0.21	36.1	7.3
0.015	0.01	0.02	Mar 1998	1973	12	106.4	6.0	0.233	0.014	0.72	0.09	39.6	14.3
0.035	0.03	0.04	Mar 1998	2199	56	149.6	14.8	0.128	0.006	0.66	0.01	23.6	12.4
0.055	0.05	0.06	Mar 1998	1790	35	121.2	7.5	0.166	0.064	0.64	0.15	3.3	3.3
0.125	0.10	0.15	Mar 1998	1340	2	96.5	1.5	0.111	0.044	0.39	0.07
0.025	0.00	0.05	Oct 1998	1316	53	177.0	1.5	0.775	0.024	0.89	0.20	47.7	19.0
0.015	0.01	0.02	Oct 1998	1408	33	166.1	1.7	0.400	0.066	0.79	0.11	14.2	14.3
0.035	0.03	0.04	Oct 1998	1613	21	139.8	5.8	0.346	0.013	0.67	0.12	17.0	17.2
0.055	0.05	0.06	Oct 1998	1616	193	118.6	2.4	0.289	0.004	0.58	0.00	37.3	37.7
0.125	0.10	0.15	Oct 1998	1171	166	131.2	6.4	0.194	0.005	0.45	0.08