Citation:

PANGAEA.771907, Supplement to: Lavezza, R et al. (in prep.): MED-Nut, a new Quality Controlled nutrient data base for the Mediterranean Sea.

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Abstract:

In the last decades, a striking amount of hydrographic data, covering the most part of Mediterranean basin, have been generated by the efforts made to characterize the oceanography and ecology of the basin. On the other side, the improvement in technologies, and the consequent perfecting of sampling and analytical techniques, provided data even more reliable than in the past. Nutrient data enter fully in this context, but suffer of the fact of having been produced by a large number of uncoordinated research programs and of being often deficient in quality control, with data bases lacking of intercalibration. In this study we present a computational procedure based on robust statistical parameters and on the physical dynamic properties of the Mediterranean sea and its morphological characteristics, to partially overcome the above limits in the existing data sets. Through a data pre filtering based on the outlier analysis, and thanks to the subsequent shape analysis, the procedure identifies the inconsistent data and for each basin area identifies a characteristic set of shapes (vertical profiles). Rejecting all the profiles that do not follow any of the spotted shapes, the procedure identifies all the reliable profiles and allows us to obtain a data set that can be considered more internally consistent than the existing ones.

Coverage:

Median Latitude: 37.956448 * Median Longitude: 15.272643 * South-bound Latitude: 30.971200 * West-bound Longitude: -10.054400 * North-bound Latitude: 43.670000 * East-bound Longitude: 35.500000

Date/Time Start: 1961-10-18T00:00:00 * Date/Time End: 2010-02-02T00:00:00

Minimum DEPTH, water: 0.0 m * Maximum DEPTH, water: 4915.8 m

Event(s):

MED-Nuts * Latitude: 35.000000 * Longitude: 18.000000 * Location: Mediterranean Sea * Comment: Compilation

Comment:

This data sets includes data that are already part of other data sets such as, e.g., MEDAR, expanded with data rescued in the framework of SEASAME EU Integrated Project and data made available by some of the partners. All the original nutrients data and, when available temperature and salinity, data are included. The novelty is in the Quality Control procedure by which data have been screened and flagged.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Cruise/expedition	Expedition
2	Station label	Station
3	Gear	Gear				B: Bottle; C: CTD
4	DATE/TIME	Date/Time				Geocode
5	LATITUDE	Latitude				Geocode
6	LONGITUDE	Longitude				Geocode
7	Depth, bathymetric	Bathy depth	m
8	DEPTH, water	Depth water	m			Geocode
9	Pressure, water	Press	dbar
10	Temperature, water	Temp	°C
11	Salinity	Sal
12	Nitrate	[NO3]-	µmol/l			or Nitrates+Nitrites when Nitrates only were not available
13	Phosphate	[PO4]3-	µmol/l
14	Silicate	Si(OH)4	µmol/l
15	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 6: Nitrate
16	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 6: Phosphate
17	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 6: Silicate
18	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 7: Nitrate
19	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 7: Phosphate
20	Quality flag	QF		Ribera d'Alcala, Maurizio	see reference(s)	Table 7: Silicate
21	Quality code	Quality		Ribera d'Alcala, Maurizio	see reference(s)	Table 8: Nitrate
22	Quality code	Quality		Ribera d'Alcala, Maurizio	see reference(s)	Table 8: Phosphate
23	Quality code	Quality		Ribera d'Alcala, Maurizio	see reference(s)	Table 8: Silicate

License:

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

Size:

1394839 data points

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