EMODnet Thematic Lot n° 4...

EMODnet Thematic Lot n° 4 - Chemistry

Black Sea

Data Collection and Metadata Compilation - nutrients data Quality control of nutrients data

First DIVA products

Luminita Buga - NIMRD George Sarbu - NIMRD

EMODnet Thematic Lot n° 4 - Chemistry Black Sea - 1st intermediate report

2

Contents

1. Introduction ..................................................................................................... 3

1.1 Black Sea Data Set ...................................................................................................................... 3

1.2 Workflow .................................................................................................................................... 3

1.3 Black Sea aggregated data collection ......................................................................................... 5

2. Ammonium data set ......................................................................................... 8

3. Silicates data set ............................................................................................ 11

4. Phosphates data set ....................................................................................... 14

5. Nitrites data set ............................................................................................. 17

6. Nitrates data set ............................................................................................ 20

7. Nitrate + Nitrite (NOx) data set ...................................................................... 23

8. Nutrients data Quality Control ....................................................................... 26

9. First DIVA tests ............................................................................................... 27


3

1. Introduction

1.1 Black Sea Data Set

The EMODnet dataset for the nutrients in the Black Sea region contains:

27694 files in ODV format received from MARIS Harvester Robot 1724 files in ODV format received from MHI

The following errors / problems occurred during Black Sea data aggregation:

Errors at importing in ODV: ODV format (wrong date format, missing QF column, etc) Mismatches between semantic header and header

Poor quality control:

High parameters values (outliers ?) No quality control (QV=0) Same value for all profile

Duplicates:

Cruise with more than one station reported as one CDI Same station(s) reported by 2 partners

1.2 Workflow

Due to the above mentioned problems, to the high number of the contributing data centers and

the high variability of the parameters labeling the following workflow was adopted:

1. ROBOT and MHI data set separated into individual data sets for every EDMO_code

2. Individual data sets imported into individual ODV collection

3. Detected ODV import errors errors corrected (in original ODV files)

4. Duplicates check for individual EDMO_code ODV collections

duplicates solved (when possible) (in original ODV files)

keep records of duplicates for further reporting to data centers

5. Re-import corrected ODV files into ODV individual collections


4

6. Units check / values check

detected wrong units contact data centers

detected impossible units values contact data centers

check for data values = 0 contact data center to check if they are missing values or

“under detection limit values

7. Export Station Data into individual EDMO_code ODV Spreadsheet files (only nutrients and

silicates variables) and:

corrections of units and /or data values (new corrected ODV files send by data centers)

data center confirmed “0” values as missing deleted (QV (SDN quality flag) =9)

QV = 3 QV=4

QV =6 (data 0, real detection limit) QV=1 and keep records of real detection limits

QV =6 (data =0) QV=3

obvious bad data and/or default data QV=4

Units conversion in mol/l

After this step individual ODV Spreadsheet files for every EDMO_code containing only nutrients

and silicates data (in mol/l) and with SDN quality flags were available for importing into new

Black Sea ODV collection

8. Created New_ODVCF6_Collection (Black_Sea_ collection) with only nutrients and silicates

variables and manually set for every variable QF schema = SEADATANET

10. Imported all individual EDMO_code ODV Spreadsheet files into new Black_Sea_collection

(when importing the individual EDMO_code ODV Spreadsheet files the original SEADATANET

Quality flags are maintained)

11. Duplicates check for Black_Sea_collection duplicates found (Same station(s) reported by 2

partners) duplicates report to be send to data centers


5

1.3 Black Sea aggregated data collection

The Black_Sea_collection contains:

28695 stations - vertical profiles

Spatial coverage and plots of variables:

Pressure, temperature profiles into depth profiles Corrections for mismatches between semantic headed – header Profiles availability only for nutrients (and silicates) data

ALL units in mol/l NO quality control on data NO (NO2+NO3) calculated WITH “0” for “under detection limit”


6

Temporal coverage: 1955 - 2013

7 stations - time series

Spatial coverage

19

55

19

57

19

59

19

61

19

63

19

65

19

67

19

69

19

71

19

73

19

75

19

77

19

79

19

81

19

83

19

85

19

87

19

89

19

91

19

93

19

95

19

97

19

99

20

01

20

03

20

05

20

07

20

09

20

11

20

13


7

Black Sea data contributors

Name EDMO_ code No CDIs Time Coverage Depth profiles/

Time Series

1 HCMR 269 4 2007 2007 DP

2 RIHMI-WDC 681 1793 1967 1994 DP

3 SIO-RAS 685 235 1985 2008 DP

4 YugNIRO 688 9650 1955 1996 DP

5 TSU_DNA 693 85 1999 2012 DP

5 IMS-METU 696 1897 1986 2010 DP

7 NIMRD 697 3911 1963 2012 DP

8 SOI (data on SIO-RAS server) 723 4048 2001 2010 DP

9 MHI 727 2356 1955 2011 DP

10 MB-UHMI 841 1933 2003 2010 DP

11 UkrSCES 1167 1582 1983 2000 DP

12 IO-BAS 1843 34 1990 1990 DP

13 IFR 191 50 2002 2003 DP

14 LME_BG 192 697 1987 2006 DP

15 BGODC 692 377 2000 2013 DP

16 Odessa National I.I.Mechnikov University 1169 10 1998 1998 DP

17 Taurida V.I. Vernadsky National University 2227 16 1996 1996 DP

18 Sinop University, Fisheries Faculty 733 17 1999 1999 DP

19 MB-UHMI 841 3 2003 2004 TS

20 DDBRA 2178 4 2008 2010 TS


8

2. Ammonium data set

The Ammonium dataset contains the following related parameters:

Parameter label P01 CODES P06 units

Units conversion to

mol/l P01 definition

AMON [mol/m^3] Codes: AMONAAZX:MLM3

mol/m3 Value * 1000

Concentration of ammonium {NH4} per unit volume of the water body [unknown phase] by colorimetric autoanalysis

AMON [~$m~#mol/l]

Codes: AMONAAZX:UPOX, AMONZZXX:UPOX

mol/l -

Concentration of ammonium {NH4} per unit volume of the water body [unknown phase] by colorimetric autoanalysis

Concentration of ammonium {NH4} per unit volume of the water body [unknown phase]

N_NH4 [mg/l] Codes: AMONMATX:UMGL

mg/l Value * 1000/14.0067

Concentration of ammonium {NH4} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysi

WC_NH4 [~$m~#mol/l]

Codes: AMONMATX:UPOX

mol/l -

Concentration of ammonium {NH4} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysi

AMON [mm/l] Codes: AMONZZXX:MMPL

mmol/l Value * 1000 Concentration of ammonium {NH4} per unit volume of the water body [unknown phase]

Ammonium [mm/l]

Codes: AMONZZXX:MMPL


Ammonia [mm/l] Codes: AMONZZXX:MMPL


Ammonium [~$m~#g/l]

Codes: AMONZZXX:UGPL

g/l Value/14.0067 Concentration of ammonium {NH4} per unit volume of the water body [unknown phase]

AMON [mg/l] Codes: AMONZZXX:UMGL

mg/l Value * 1000/14.0067

Concentration of ammonium {NH4} per unit volume of the water body [unknown phase]

NH4 [~$m~#mol/l] Codes: AMONZZXX:UPOX

mol/l - Concentration of ammonium {NH4} per unit volume of the water body [unknown phase]


9

Ammonium (N-NH4) data set contains:

Total depth profiles (stations): 7166

Total measurements: 25742 from which:

23193 data 0

2549 data = 0

Spatial coverage and plot of Ammonium data set

Data with QV (SEADATANET) =0, 1, 2 Excluded data with QV=4 “0” values with QV=3


10

N-NH4 Stations density distribution

N-NH4 Temporal coverage / number of profiles per year

0

100

200

300

400

500

600

700

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

1 19

1

1 5

0

14

1

45

3

11

56

6

4

51

4

5

16

0

93

9

3 1

35

1

70

9

6

22

1

17

3

26

1

13

1

14

4

12

7

96

1

7

34

73

12

9

24

6

22

1

42

7

66

4

62

7

50

8

32

7

41

1

29

9

32

8

10

7

24

8

80

N-NH4 1955 - 2013


11

3. Silicates data set


Parameter label

P01 CODES P06 units

Units conversion to


Si [mg/l] Codes: SLCAMATX:UMGL

mg/l Value* 1000/28.08550

Concentration of silicate {SiO4} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

WC_SiO4 [~$m~#mol/l]

Codes: SLCAMATX:UPOX

mol/l -


SLCA [~$m~#mol/l]

Codes: SLCAMAZX:UPOX, SLCAZZXX:UPOX

mol/l -


Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]

SLCA [mm/l] Codes: SLCAZZXX:MMPL

mmol/l Value * 1000 Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]

Silicate [mm/l]

Codes: SLCAZZXX:MMPL

mmol/l Value * 1000 Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]

Silicate [~$m~#g/l]

Codes: SLCAZZXX:UGPL

mg/l Value /28.0855 Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]

SIO3 [~$m~#mol/l]

Codes: SLCAZZXX:UPOX

mol/l - Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]

SI [~$m~#mol/l]

Codes: SLCAZZXX:UPOX

mol/l - Concentration of silicate {SiO4} per unit volume of the water body [unknown phase]


12

Silicates (S-SiO4) data set contains:

Total depth profiles (stations): 19146

Total measurements: 109326 from which:

108026 data 0 1300 data = 0

Spatial coverage and plot of Silicates data set

Data with QV=0, 1, 2 Excluded data with QV=4 “0” values with QV=3


13

S-SiO4 Stations density distribution

S-SiO4 Temporal coverage / number of profiles per year

0

100

200

300

400

500

600

700

800

900

1000

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

10

4

12

5

11

3

11

0

13

3

16

3

32

3

30

0 3

94

2

97

2

36

29

5

28

5

26

5

17

9

16

6

42

0

36

6

47

8

47

1

23

0

54

10

7

32

3

37

2

27

6

41

2

34

2 4

40

4

01

3

33

6

89

8

35

92

4

33

8

61

2

37

2

36

4

58

1

45

8

32

1

27

2

12

0

88

14

8 21

0

32

0

20

5

40

4

60

6

52

7 58

6

32

8 4

06

2

91

37

9

10

7

62

8

0

SiO4 1955 - 2013


14

4. Phosphates data set


Parameter label P01 CODES P06

units

Units conversion to


PO4 [~$m~#mol/kg]

Codes: MDMAP906:KGUM

mol/kg Value * 1

Concentration of phosphate {PO4} per unit mass of the water body [unknown phase]

PHOS0 [~$m~#mol/l]

Codes: PHOSAADZ:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body dissolved plus reactive particulate <unknown phase] by filtration and colorimetric autoanalysis

PHOS1 [~$m~#mol/l]

Codes: PHOSAAZX:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body [unknown phase] by colorimetric autoanalysis

PHOS2 [~$m~#mol/l]

Codes: PHOSZZXX:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body [unknown phase

PHOS [~$m~#mol/l]

Codes: PHOSAAZX:UPOX, PHOSZZXX:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body [unknown phase] by colorimetric autoanalysis


P_PO4 [mg/l] Codes: PHOSMATX:UMGL

mg/l Value * 1000/30.97376

Concentration of phosphate {PO4} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

WC_PO4 [~$m~#mol/l]

Codes: PHOSMATX:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

PO4 [~$m~#mol/l]

Codes: PHOSMAZX:UPOX, PHOSZZXX:UPOX

mol/l -

Concentration of phosphate {PO4} per unit volume of the water body [unknown phase] by manual colorimetric analysis


Phosphate [~$m~#mol/kg]

Codes: PHOSZZXX:KGUM

mol/kg Value * 1



15

PHOS [mm/l] Codes: PHOSZZXX:MMPL

mmol/l Value * 1000


Phosphate [mm/l]

Codes: PHOSZZXX:MMPL

mmol/l Value * 1000


Phosphate [~$m~#g/l]

Codes: PHOSZZXX:UGPL

g/l Value/30.97376


PHOS [ug/l] Codes: PHOSZZXX:UPGL

g/l Value/30.97376


Phosphates [~$m~#mol/l]

Codes: PHOSZZXX:UPOX

mol/l -


Phosphates (P-PO4) data set contains:

Total depth profiles (stations): 23387 Total measurements: 135391 from which:

126318 data 0 9073 data = 0

Spatial coverage and plot of Phosphates data set



16

P-PO4 Stations density distribution

P-PO4 Temporal coverage / number of profiles per year

0

200

400

600

800

1000

1200

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

11

8

12

6

13

3

12

2 18

2

19

4

37

1

34

1

39

3

30

2

24

1 30

8

29

6

26

2

18

3

18

6

40

4

37

9 4

83

5

38

2

80

1

52

2

77

3

24

3

58

2

77

5

32

3

94

46

0

40

4

43

3

70

1

96

9

11

80

4

21

7

47

4

65

1

00

7

93

5

80

7

61

3

45

8

11

9

11

3

25

1

37

8

36

0

24

8

42

0

68

4

63

4

58

4

32

8 40

8

29

0 3

79

1

07

2

48

8

0

PO4 1955 - 2013


17

5. Nitrites data set

The Nitrites dataset contains the following related parameters:

Parameter label

P01 CODES P06

units

Units conversion to


N_NO2 [mg/l] Codes: NTRIMATX:UMGL

mg/l Value * 1000/14.0067

Concentration of nitrite {NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

WC_NO2 [~$m~#mol/l]

Codes: NTRIMATX:UPOX

mol/l -

Concentration of nitrite {NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

Nitrite [mm/l] Codes: NTRIZZXX:MMPL

mmol/l Value * 1000 Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

Nitrites [mm/l] Codes: NTRIZZXX:MMPL

mmol/l Value * 1000 Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

NTRI [mm/l] Codes: NTRIZZXX:MMPL, MDMAP007:MMPL

mmol/l Value * 1000

Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

Concentration of nitrite {NO2} per unit mass of the water body [unknown phase]

Nitrite [~$m~#g/l]

Codes: NTRIZZXX:UGPL

g/l Value/14.0067 Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

NTRI [mg/l] Codes: NTRIZZXX:UMGL

mg/l Value * 1000/14.0067

Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

NTRI [~$m~#mol/l]

Codes: NTRIZZXX:UPOX

mol/l - Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]

NO2 [~$m~#mol/l]



Nitrite [~$m~#mol/l]



NTRI [ug/l] Codes: NTRIZZZZ:UPGL

g/l Value/14.0067 Concentration of nitrite {NO2} per unit volume of the water body [unknown phase]


18

Nitrites (N-NO2) data set contains:


40134 data 0 12898 data = 0

Spatial coverage and plot of Nitrites data set



19

N-NO2 Stations density distribution

N-NO2 Temporal coverage / number of profiles per year

0

100

200

300

400

500

600

700

1956

1958

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

2012

71

7

7

82

8

0

26

6

27

5

21

2 23

8

18

2

95

6

38

1 14

1

5

98

56

10

7

12

4

13

2

12

2

14

1

13

1

12

0

24

7

93

1

61

20

3

18

2

96

3

71

2

76

6

70

6

66

5

34

5

12

2

34

7

1 10

4

22

8

31

7

26

8

18

9

40

8

68

3

63

2

52

0

26

9

41

6

30

1 35

9

10

7

24

8

80

N-NO2


20

6. Nitrates data set

The Nitrites dataset contains the following related parameters:

Parameter label P01 CODES P06

units

Units conversion to


NTRA [mol/m^3] Codes: CHEMM012:MLM3

mol/m3 Value *1000

Concentration of nitrate {NO3} (NOT nitrate+nitrite) per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis and correction for nitrite

N_NO3 [mg/l] Codes: NTRAYYDZ:UMGL

mg/l Value * 1000/14.0067

Concentration of nitrate {NO3} per unit volume of the water body [dissolved plus reactive particulate phase]

Nitrate [~$m~#mol/kg]

Codes: NTRAZZXX:KGUM

mol/kg Value Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

Nitrate [mm/l] Codes: NTRAZZXX:MMPL

mmol/l Value *1000 Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

Nitrates [mm/l] Codes: NTRAZZXX:MMPL

mmol/l Value *1000 Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

NTRA [mm/l] Codes: NTRAZZXX:MMPL, MDMAP005:MMPL

mmol/l Value *1000

Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

Concentration of nitrate {NO3} per unit mass of the water body [unknown phase]

Nitrate [~$m~#g/l] Codes: NTRAZZXX:UGPL

g/l Value /14.0067 Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

NTRA [mg/l] Codes: NTRAZZXX:UMGL

mg/l Value * 1000/14.0067

Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

NTRA [ug/l] Codes: NTRAZZXX:UPGL

g/l Value /14.0067 Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]

NTRA [~$m~#mol/l] Codes: NTRAZZXX:UPOX

mol/l - Concentration of nitrate {NO3} per unit volume of the water body [unknown phase]


21

NO3 [~$m~#mol/l] Codes: NTRAZZXX:UPOX


Nitrates [~$m~#mol/l]

Codes: NTRAZZXX:UPOX


WC_NO3 [~$m~#mol/l]

Codes: NTRZMATX:UPOX, NTRAMADZ:UPOX

mol/l -

Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

Concentration of nitrate {NO3} per unit volume of the water body [dissolved plus reactive particulate <unknown phase] by filtration and manual colorimetric analysis and correction for nitrite

Nitrites (N-NO2) data set contains:


31775 data 0 6241 data = 0

Spatial coverage and plot of Nitrites data set



22

N-NO3 Stations density distribution

N-NO2 Temporal coverage / number of profiles per year

0

100

200

300

400

500

600

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

5

74

5

3

62

4

1

20

9

15

5

4

2

2

10

7

58

1

07

1

24

1

11

1

10

6

9

51

1

02

2

74

9

3 1

28

1

41

2

09

8

6

16

3

25

9

47

2

56

9

51

8

36

0

23

6

52

1

00

14

2

22

4

15

3

13

5

31

6

53

1

44

4

40

1

15

8

27

1

21

6

23

9

10

7

24

8

80

N-NO3 1955 - 2013


23

7. Nitrate + Nitrite (NOx) data set

The original EMODnet dataset for the nutrients in the Black Sea (NO3+NO2) data with the

following related parameters:

Parameter label

P01 CODES P06

units

Units conversion

to mol/l P01 definition

WC_NO3 [~$m~#mol/l]

Codes: NTRZMATX:UPOX, NTRAMADZ:UPOX

mol/l -

Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by manual colorimetric analysis

Concentration of nitrate {NO3} per unit volume of the water body [dissolved plus reactive particulate <unknown phase] by filtration and manual colorimetric analysis and correction for nitrite

Nitrate+nitrite [mm/l]

Codes: NTRZZZXX:MMPL

mmol/l Value * 1000

Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [unknown phase]

Nitrogen [mm/l]

Codes: NTRZZZXX:MMPL

mmol/l Value *1000

Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [unknown phase]

NTRZ [~$m~#mol/l]

Codes: NTRZZZXX:UPOX

mol/l - Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [unknown phase]

NO3_NO2 [~$m~#mol/l]

Codes: NTRZZZXX:UPOX

mol/l - Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [unknown phase]

Because the final product will deal with NOx (NO2_NO3) the following steps were done:

1. From the ODV Black_Sea_collection Export Station Data into ODV Spreadsheet files

only NO2, NO3 and (NO3+NO2) (in mol/l)

2. Calculation of NOx (NO2_NO3) as following:

If [NO3 (QV= 1 or QV=2) and NO2 (QV=1 or QV=2 or QV=3 or QV=9)]

then calculate NOx=NO2+NO3

else “null value”


24

3. For calculated NOx ‘null value” QV=1

4. For calculated NOx = “null value” QV=9

5. If NO2, NO3 and (NO3+NO2) were provided in the same time then comparison between

(NO3+NO2) and calculated NOx as following:

If [(NO3+NO2) >0 and (QV=1 or QV=2)] and [(NO3+NO2) calculated NOx]

then keep (NO3+NO2) for final product

else keep calculated NOx for final product

Final NOx data set contains:


47157 data 0 0 data = 0

Spatial coverage and plot of NOx (NO2_NO3) data set

Aggregated NOx (NO3 & calculated NOx) Data with QV=0, 1, 2 (NO3) Data with QV=1 (NOx) “0” values with QV=3 (NO3)


25

NOx Stations density distribution

NOx Temporal coverage / number of profiles per year

0

100

200

300

400

500

600

700

800

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

4 5

2

35

4

2

25

1

12

7

5

2

10

7

57

10

7

12

4

11

1

11

0

69

5

1 1

02

2

58

9

3

19

2

22

9 27

8

15

3 2

48

34

3

53

2

70

1

60

5

49

3

24

9

11

7

10

5 1

83

3

28

2

26

1

35

2

44

4

50

4

28

3

88

2

21

31

5

21

6 26

7

10

7 1

77

4

0

N-NOx 1955 - 2013


26

8. Nutrients data Quality Control

After the second MARIS ROBOT harvesting for nutrients data sets, the new data will be proceeded

following the same steps as described in 1.2. Workflow.

The new obtained individual EDMO_code ODV Spreadsheet files will be imported into Black_Sea_collection

Due to the high variability of the nutrients values (from the coast to the center of the Black Sea)

and to the different characteristics of entire basin MEDAR/MEDATLAS Sub-domains for Black Sea

will be used for setting the minimum-maximum nutrients values.

For every sub domains, Specialist Quality control (in collaboration with Black Sea partners)

will be done especially for high values outliers: possible/impossible values.

For DIVA products only values with QV = 0, 1, 2 will be used.

Specialist selection on periods: Years vs selection of years (decades and/or trends periods)


27

9. First DIVA tests

The first DIVA attempts to produce gridded fields were done on Nitrate (NO3) parameter for the

whole Black Sea, Marmara Sea and Azov Sea as they are included in one MSFD region.

Initial settings are as following:

Levels: 0, 10, 20, 30, 50, 75, 100

Years: 1955 – 2013

Months: 03-05, 06-08 (spring, summer)

Quality flags (SDN): 0, 1, 2

Lc: correlation: 1.5

Signal to noise ratio of the whole dataset: 0.5

ireg: mode selected for background field: mean of data

As example of resulting maps, the spring season gridded fields with the data location are illustrated

bellow. The calculated optimized DIVA input parameters are shown for each level.

NO3- Level: 0m Months: 03-05 Optimized CL: 0.332; Optimized S/N: 0.1 Varbak: 0.149




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