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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 1 Nutrient concentrations and ratios (mean ± standard deviation) in both dissolved and particulate phases, and biomass and phytoplankton community composition in three water types: eddy C2 (mature stage), eddy C1 (decay stage) and non-eddy water (SouthEast Asian Time-series Study (116oE, 18oN))

From: Changes in nutrient stoichiometry in responding to diatom growth in cyclonic eddies

Parameter

C2(mature)

C1(decay)

Non-eddy

aAge (d)

15–20

47–57

–

bN + N (0–100 m, μmol L−1)

6.6 ± 3.7

5.0 ± 1.7

1.7 ± 0.84

bSRP (0–100 m, μmol L−1)

0.44 ± 0.02

0.35 ± 0.12

0.13 ± 0.06

bSi(OH)4 (0–100 m, μmol L−1)

7.5 ± 2.7

6.6 ± 1.6

3.6 ± 0.64

bN + N (150–300 m, μmol L−1)

20 ± 1.7

20 ± 1.2

18 ± 2.3

bSRP (150–300 m, μmol L−1)

1.4 ± 0.1

1.4 ± 0.1

1.3 ± 0.18

bSi(OH)4 (150–300 m, μmol L−1)

27 ± 2.8

28 ± 2.3

25 ± 4.0

cN/P @ SCM

21.2 ± 7.5

15.0 ± 4.3

13.2 ± 7.0

N/P (0–100 m)

19.1 ± 6.9

14.3 ± 3.9

14.7 ± 5.9

N/P (150–300 m)

15.0 ± 0.76

13.8 ± 0.86

14.5 ± 1.2

cSi/N @SCM

1.3 ± 0.64

1.7 ± 0.93

3.2 ± 2.3

Si/N (0–100 m)

1.1 ± 0.55

1.8 ± 2.3

1.9 ± 1.8

Si/N (150–300 m)

1.3 ± 0.19

1.4 ± 0.19

1.2 ± 0.28

bbSiO2 (0–100 m, mmol m−2)

33 ± 9

12 ± 4

9

PN (0–100 m, mmol m−2)

37 ± 5

30 ± 4

24

bSiO2/PN (0–100 m)

1.4 ± 1.1

0.5 ± 0.33

0.4 ± 0.16

bSiO2/POC (0–100 m)

0.16 ± 0.018

0.082 ± 0.069

0.06 ± 0.027

d∆N/∆P

10–16

10–16

-

d∆Si/∆N

1–2

1–2

-

bTChl a (0–100, mg m−2)

25.3 ± 7.3

22.7 ± 5.8

13 ± 4.1

bFucoxanthin (0–100 m, mg m−2)

2.1 ± 1.1

1.7 ± 0.8

0.6 ± 0.2

bDiatom abundance (0–100 m, 107cells m−2)

2.1 ± 0.9

0.8 ± 0.2

-

eDiatom biomass percent (%)

7.6 ± 6.6

2.2 ± 2.0

 

Diazotroph abundance (0–100 m, 103 cell m−2)

1.2 ± 1.0

1.0 ± 0.3

 

fNutrient intrusion flux@150 m (mmol N m−2 d−1)

70 ± 4

11 ± 1

-

bPrimary Production (0–100 m, mmol N m−2d−1)

11.2

10.7

1.9

  1. SRP soluble reactive phosphorus, bSiO2 biogenic silica
  2. aThe age of the eddies is estimated based on the evolution of sea level anomalies, and the non-eddy water is considered as the initial timepoint of the eddies;
  3. bValues are mean ± standard deviation of the averages of the depth integrated concentrations;
  4. cSCM: subsurface Chlorophyll Maximum;
  5. d∆N/∆P and ∆Si/∆N represent the diatom nutrient uptake ratios simulated by a 1-D inverse model;
  6. eThe diatom biomass percent (relative to total biomass) was estimated by acquiring the relative contribution of taxa (individual pigment) to the total chlorophyll a using the chemical taxonomy program, CHEMTAX (Wang et al. 2016)
  7. fNutrient intrusion fluxes are first order estimates obtained by multiplication of the upwelling rate and the average nitrate + nitrite (N + N) concentration at 150 m, where biological assimilation was negligible