OSNAP Original Data Format

The OSNAP array provides multiple observational data products including time series of overturning and heat/freshwater transport, streamfunctions in density space, and gridded fields of velocity, temperature, and salinity.

At OSNAP, we have variables like MOC_ALL, MOC_EAST and MOC_WEST which are time series (TIME), but these could be represented as MOC (N_PROF, TIME) where instead of the three different variables, N_PROF=3. This would be somewhat more difficult to communicate to the user, since LATITUDE and LONGITUDE are not single points per N_PROF but instead may represent end points of a section.

Variables MOC_ALL_ERR are also provided, which could be translated to MOC_ERR (N_PROF, TIME) with LATITUDE (N_PROF) or LATITUDE_BOUND (N_PROF, 2).

Heat fluxes also exist, as MHT_ALL, MHT_EAST and MHT_WEST, so these could be MHT (N_PROF, TIME).

OSNAP_MOC_MHT_MFT_TimeSeries_201408_202006_2023.nc

Variables

Name

Dimensions

Shape

Units

Description

TIME

TIME

(71,)

datetime

  • standard_name: time

  • long_name: Start date of each monthly period

  • units: days since 1950-01-01

  • comment: Start date of each month

  • processing_level: data manually reviewed

MOC_ALL

TIME

(71,)

Sv

  • standard_name: Transport_anomaly

  • long_name: Total MOC

  • description: Maximum overturning streamfunction across full OSNAP array

  • comment: Maximum of the overturning streamfunction in sigma_theta coordinates

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

MOC_ALL_ERR

TIME

(71,)

Sv

  • standard_name: Transport_anomaly

  • long_name: MOC uncertainty

  • description: Uncertainty in MOC_ALL

  • comment: Determined from a Monte Carlo analysis

MOC_EAST

TIME

(71,)

Sv

  • standard_name: Transport_anomaly

  • long_name: MOC east

  • description: Overturning streamfunction at OSNAP East

  • comment: Maximum of the overturning streamfunction in sigma_theta coordinates

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

MHT_ALL

TIME

(71,)

PW

  • standard_name: Heat_transport

  • long_name: Heat transport

  • description: Meridional heat transport across full OSNAP array

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

MFT_ALL

TIME

(71,)

Sv

  • standard_name: Freshwater_transport

  • long_name: Freshwater transport

  • description: Meridional freshwater transport across full OSNAP array

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

OSNAP_Streamfunction_201408_202006_2023.nc

Variables

Name

Dimensions

Shape

Units

Description

TIME

TIME

(71,)

datetime

  • standard_name: time

  • long_name: Start date of each monthly period

  • units: days since 1950-01-01

  • comment: Start date of each month

  • processing_level: data manually reviewed

LEVEL

LEVEL

(481,)

kg m-3

  • standard_name: potential_density

  • long_name: Sigma-theta levels

  • description: Potential density surfaces (sigmatheta)

  • processing_level: data manually reviewed

T_ALL

LEVEL, TIME

(481, 71)

Sv

  • standard_name: Transport

  • long_name: Streamfunction total

  • description: Streamfunction in sigmatheta coordinates across full OSNAP

  • comment: Streamfunction in sigma_theta coordinates

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

T_EAST

LEVEL, TIME

(481, 71)

Sv

  • standard_name: Transport

  • long_name: Streamfunction east

  • description: Streamfunction in sigmatheta at OSNAP East

  • comment: Streamfunction in sigma_theta coordinates

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

T_WEST

LEVEL, TIME

(481, 71)

Sv

  • standard_name: Transport

  • long_name: Streamfunction west

  • description: Streamfunction in sigmatheta at OSNAP West

  • comment: Streamfunction in sigma_theta coordinates

  • QC_indicatoris: good data

  • processing_level: data manually reviewed

OSNAP_Gridded_201408_202006_2023.nc

Variables

Name

Dimensions

Shape

Units

Description

TIME

TIME

(71,)

datetime

  • standard_name: time

  • long_name: Start date of each monthly period

  • units: days since 1950-01-01

  • comment: Start date of each month

  • processing_level: data manually reviewed

LATITUDE

LATITUDE

(256,)

degrees_north

  • standard_name: latitude

  • long_name: Latitude

  • description: Latitude in degrees

  • axis: Y

LONGITUDE

LONGITUDE

(256,)

degrees_east

  • standard_name: longitude

  • long_name: Longitude

  • description: Longitude in degrees

  • axis: X

DEPTH

DEPTH

(199,)

m

  • standard_name: depth

  • long_name: Depth

  • description: Depth in meters

  • positive: down

  • axis: Z

VELO

TIME, DEPTH, LONGITUDE

(71, 199, 256)

m s-1

  • standard_name: sea_water_velocity

  • long_name: Velocity

  • description: Cross-sectional velocity along OSNAP

  • QC_indicator: good data

  • processing_level: Data manually reviewed

TEMP

TIME, DEPTH, LONGITUDE

(71, 199, 256)

degC

  • standard_name: sea_water_temperature

  • long_name: Temperature

  • description: In-situ temperature along OSNAP

  • QC_indicator: good data

  • processing_level: Data manually reviewed

SAL

TIME, DEPTH, LONGITUDE

(71, 199, 256)

psu

  • standard_name: sea_water_practical_salinity

  • long_name: Salinity

  • description: Practical salinity along OSNAP

  • QC_indicator: good data

  • processing_level: Data manually reviewed