Citation:

PANGAEA.882292

Name: Monitoring of spatial and temporal variability in bottom water oxygen levels on the Southern Benguela continental shelf, from 2014 to 2017
Creator: Stephanie de Villiers
Published: 2017-10-27
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2017-10-27 • DOI registered: 2018-04-29

RIS Citation BibTeX Citation Text Citation ShareShow Map Google Earth

Abstract:

There is increasing evidence for a global trend towards lower seawater dissolved oxygen levels, which poses a threat to marine ecosystem health. A particular concern is upwelling areas, such as the Benguela Upwelling System, that is predisposed to low oxygen levels with occasional catastrophic consequences for fisheries resources. In the Southern Benguela Upwelling System, the lowest seawater O2 levels are typically found in inshore bottom waters at relatively shallow depths on the shelf. In order to better understand the factors inducing low oxygen conditions, temporal trends, and to provide input to the Department of Environmental Affairs' annual State of the Oceans and Coasts Report, oxygen data had been collected approximately 3-monthly along 4 transects, since 2014. To this dataset had been added data collected on a random sampling grid in the vicinity of the monitoring lines. The dissolved oxygen, temperature and salinity data represent stations at a maximum depth of about 500 m, for cruises conducted on the R/V Algoa in: August 2014 (AUG14), October 2014 (OCT14), February 2015 (FEB15), May 2015 (MAY15), September 2015 (SEP15), November 2015 (NOV15), February 2016 (FEB16), May 2016 (MAY16), August 2016 (AUG16), November 2016 (NOV16), February 2017 (FEB17) and May 2017 (MAY17).

Coverage:

Median Latitude: -32.200567 * Median Longitude: 17.625232 * South-bound Latitude: -34.330000 * West-bound Longitude: 14.695700 * North-bound Latitude: -29.383800 * East-bound Longitude: 18.369500

Minimum DEPTH, water: 0.99 m * Maximum DEPTH, water: 560.19 m

Event(s):

C11059 * Latitude: -33.458200 * Longitude: 18.236800 * Elevation: -39.0 m * Location: Benguela Upwelling * Method/Device: (CTD-RO) * Comment: basis R/V Algoa

C11060 * Latitude: -33.488200 * Longitude: 18.147500 * Elevation: -61.0 m * Location: Benguela Upwelling * Method/Device: (CTD-RO) * Comment: basis R/V Algoa

C11061 * Latitude: -33.536500 * Longitude: 17.960500 * Elevation: -121.0 m * Location: Benguela Upwelling * Method/Device: (CTD-RO) * Comment: basis R/V Algoa

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		de Villiers, Stephanie
2	Latitude of event	Latitude		de Villiers, Stephanie
3	Longitude of event	Longitude		de Villiers, Stephanie
4	Elevation of event	Elevation	m	de Villiers, Stephanie
5	Pressure, water	Press	dbar	de Villiers, Stephanie
6	DEPTH, water	Depth water	m	de Villiers, Stephanie	Geocode
7	Temperature, water	Temp	°C	de Villiers, Stephanie	MAY17
8	Salinity	Sal		de Villiers, Stephanie	MAY17, in psu
9	Oxygen	O2	µmol/l	de Villiers, Stephanie	MAY17
10	Temperature, water	Temp	°C	de Villiers, Stephanie	FEB17
11	Salinity	Sal		de Villiers, Stephanie	FEB17, in psu
12	Oxygen	O2	µmol/l	de Villiers, Stephanie	FEB17
13	Temperature, water	Temp	°C	de Villiers, Stephanie	NOV16
14	Salinity	Sal		de Villiers, Stephanie	NOV16, in psu
15	Oxygen	O2	µmol/l	de Villiers, Stephanie	NOV16
16	Temperature, water	Temp	°C	de Villiers, Stephanie	AUG16
17	Salinity	Sal		de Villiers, Stephanie	AUG16, in psu
18	Oxygen	O2	µmol/l	de Villiers, Stephanie	AUG16
19	Temperature, water	Temp	°C	de Villiers, Stephanie	MAY16
20	Salinity	Sal		de Villiers, Stephanie	MAY16, in psu
21	Oxygen	O2	µmol/l	de Villiers, Stephanie	MAY16
22	Temperature, water	Temp	°C	de Villiers, Stephanie	FEB16
23	Salinity	Sal		de Villiers, Stephanie	FEB16, in psu
24	Oxygen	O2	µmol/l	de Villiers, Stephanie	FEB16
25	Temperature, water	Temp	°C	de Villiers, Stephanie	NOV15
26	Salinity	Sal		de Villiers, Stephanie	NOV15, in psu
27	Oxygen	O2	µmol/l	de Villiers, Stephanie	NOV15
28	Temperature, water	Temp	°C	de Villiers, Stephanie	SEP15
29	Salinity	Sal		de Villiers, Stephanie	SEP15, in psu
30	Oxygen	O2	µmol/l	de Villiers, Stephanie	SEP15
31	Temperature, water	Temp	°C	de Villiers, Stephanie	MAY15
32	Salinity	Sal		de Villiers, Stephanie	MAY15, in psu
33	Oxygen	O2	µmol/l	de Villiers, Stephanie	MAY15
34	Temperature, water	Temp	°C	de Villiers, Stephanie	FEB15
35	Salinity	Sal		de Villiers, Stephanie	FEB15, in psu
36	Oxygen	O2	µmol/l	de Villiers, Stephanie	FEB15
37	Temperature, water	Temp	°C	de Villiers, Stephanie	OCT14
38	Salinity	Sal		de Villiers, Stephanie	OCT14, in psu
39	Oxygen	O2	µmol/l	de Villiers, Stephanie	OCT14
40	Temperature, water	Temp	°C	de Villiers, Stephanie	AUG14
41	Salinity	Sal		de Villiers, Stephanie	AUG14, in psu
42	Oxygen	O2	µmol/l	de Villiers, Stephanie	AUG14

License:

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

Size:

255242 data points

Download Data

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

View dataset as HTML (shows only first 2000 rows)