Oceanographic moored CTD and current time series at fjord station (GF10) in Nuup Kangerlua (SW Greenland)

# Oceanographic moored time series at inner fjord station in Nuup Kangerlua (SW Greenland)

This dataset consists of two parts:  

- **Part 1**: Moored current data (ADCP)  
- **Part 2**: MicroCAT temperature and salinity data  

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## Part 1: Oceanographic moored current time series

### Description

This dataset contains Acoustic Doppler Current Profiler (ADCP) measurements collected at station GF10 in Nuup Kangerlua, SW Greenland . Two ADCPs were deployed on the same mooring and together provide a almost full-depth velocity record of the inner fjord circulation between 2018-05-29 and 2019-06-12.  
The mooring was deployed at location:
**64°36.743′ N, 50°57.254′ W**

- The **deep ADCP** (Teledyne RDI 75 kHz Long Ranger) was mounted looking upward and recorded velocity profiles every 60 minutes, covering depths from ~43 m to ~507 m.  
- The **shallow ADCP** (Teledyne RDI 300 kHz Workhorse Sentinel) was mounted looking upward and recorded velocity profiles every 30 minutes, covering depths from ~4.8 m to ~50.8 m.  

The dataset is part of the project *“Greenland fjords as gateways between the ice sheet and the ocean”* (UU–NIOZ collaboration) and contributes to long-term monitoring of fjord circulation and ice–ocean interactions. Data processing included quality control by flagging and removal of outliers (>3× standard deviation).  

All NetCDF metadata attributes are included according to CF and ACDD conventions (featureType = timeseries, Conventions = ACDD-1.3). 

For more information please contact:  

**Anneke Vries (anneke.vries@nioz.nl)**   or **Lorenz Meire (LoMe@natur.gl)**

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### Data variables

#### Velocity components
- **SerEmpersec** — Eastward velocity (not adjusted for magnetic declination), [m s⁻¹]  
- **SerNmpersec** — Northward velocity (not adjusted for magnetic declination), [m s⁻¹]  
- **SerVmpersec** — Vertical velocity (do not use), [m s⁻¹]  
- **SerErmpersec** — Error velocity, [m s⁻¹]  
- **SerMagmpersec** — Current horizontal magnitude/speed, [m s⁻¹]  
- **SerDir10thDeg** — Current direction (10th degree resolution), [degrees]  

#### Derived velocity coordinates
- **Alongmpersec** — Velocity in the main (fjord-aligned) direction, outliers removed [m s⁻¹]  
- **Acrossmpersec** — Velocity in the perpendicular direction, outliers removed [m s⁻¹]  
- **AlongResmpersec** — Residual velocity in the main direction (barotropic tide and outliers removed) [m s⁻¹]  
- **AcrossResmpersec** — Residual velocity in the perpendicular direction (barotropic tide and outliers removed), [m s⁻¹]  

#### Coordinates and flags
- **time** — Measurement timestamp
- **z** — Bin depth (positive down), [m]  
- **flag** — Quality flag (0 = good, 1 = bad)  

#### Echo amplitude
- **SerEA1cnt, SerEA2cnt, SerEA3cnt, SerEA4cnt** — Echo amplitude per beam, [counts]  
- **SerEAAcnt** — Average echo amplitude, [counts]  

#### Correlation
- **SerC1cnt, SerC2cnt, SerC3cnt, SerC4cnt** — Correlation per beam, [counts]  
- **SerCAcnt** — Average correlation, [counts]  

#### Percent good (quality indicators)
- **SerPG1, SerPG2, SerPG3, SerPG4** — Percent good per beam, [counts]  

#### Instrument diagnostics and orientation
- **AnP100thDeg** — Pitch angle in 1/100 degree, [°]  
- **AnR100thDeg** — Roll angle in 1/100 degree, [°]  
- **AnH100thDeg** — Heading angle in 1/100 degree, [°]  
- **AnT100thDeg** — Temperature in °C ×100, [°C]  
- **AnDepthmm** — Depth from pressure sensor, [mm]  
- **AnOrienUP** — Orientation (1 = up, 0 = down), [dimensionless]  
- **AnBIT** — Binary input flag, [1]  
- **AnBatt** — Battery voltage, [V]  

## Part 2: Oceanographic moored MicroCAT time series

### Description

This dataset contains temperature and salinity data from 4 moored instruments deployed between **2018-05-29** and **2019-06-12**.  
The instruments were Sea-Bird SBE37 MicroCAT CTDs, deployed at mooring station GF10 in Nuup Kangerlua, SW Greenland, on the same mooring as the ADCPs:  
**64°36.743′ N, 50°57.254′ W**

The sample interval was **10 minutes**. Instruments were initially intended to be at depths of 60 m, 150 m, 330 m, and 540 m, but final mounting depths were approximately:  

- 60 m  (target: 60 m)  
- 156 m  (target: 150 m)  
- 328 m  (target: 330 m)  
- 533 m  (target: 540 m)  

### Data variables
- **date** — date and time (DD/MM/YYYY HH:MM:SSS)  
- **time** — Measurement time in Julian days  
- **Instrument** - Different instruments 
- **Pressure [dbar]** — Pressure [dbar] 
- **t090** — Temperature, ITS-90 [°C]  
- **c0S/m** — Conductivity [S/m]  
- **sal** — Practical salinity   
- **temp** — Potential temperature [°C]   
- **sigma-dens** — Density, sigma-theta [kg m⁻³] 
- **dens** — Density [kg m⁻³]