Table 2 Bottom-water conditions at the sampling locations that have been used for the core-top calibration.

From: A deep-learning automated image recognition method for measuring pore patterns in closely related bolivinids and calibration for quantitative nitrate paleo-reconstructions

Sampling locations

Nitrate (µM)

Water depth (m)

Salinity

Oxygen (µmol/kg)

Temperature (°C)

Costa Rica (SO206-43-MUC)

39.1

568

34.69

9.53

7.47

Sagami Bay push core (Japan)

42.2

1410

34.50

56.40

2.30

M77/1-455/MUC-21 (OMZ, Peru)

34.0

465

34.64

2.42

8.12

M77/1-565/MUC-60 (OMZ, Peru)

40.1

640

34.56

8.17

6.70

M77/1-445/MUC-15 (OMZ, Peru)

40.8

928

34.56

36.77

4.76

M77/1-487/MUC-39 (OMZ, Peru)

38.8

579

34.55

3.70

7.21

M77/1-459/MUC-25 (OMZ, Peru)

41.0

698

34.57

12.55

6.68

M77/1-604/MUC-74 (OMZ, Peru)

40.8

878

34.53

34.23

5.72

M77/1-516/MUC-40 (OMZ, Peru)

36.1

513

34.60

2.40

8.05

  1. Sampling locations in italic letters have been taken from32.