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Description

This dataset was produced by the Adaptive Sampling of Rain and Ocean Salinity from Autonomous Seagliders (NASA grant NNX17AK07G) project, an investigation to develop tools and strategies to better measure the structure and variability of upper-ocean salinity in rain-dominated environments. From October 2019 to January 2020, three Seagliders were deployed near Guam (14°N 144°E). The Seaglider is an autonomous profiler measuring salinity and temperature in the upper ocean. The three gliders sampled in an adaptive formation to capture the patchiness of the rain and the corresponding oceanic response in real time. The location was chosen because of the likelihood of intense tropical rain events and the availability of a NEXRAD (S-band) rain radar at the Guam Airport. Spacing between gliders varies from 1 to 60 km. Data samples are gridded by profile and on regular depth bins from 0 to 1000 m. The time interval between profiles was about 3 hours, and they are typically about 1.5 km apart. These profiles are available at Level 2 (basic gridding) and Level 3 (despiked and interpolated). All Seaglider data files are in netCDF format with standards compliant metadata. The project was led by a team from the Applied Physics Laboratory at the University of Washington.

Product Summary

Platforms
SEAGLIDER
Instruments
CTD
Spatial Extent

N: 14.71229 S: 13.39476 E: 144.613 W: 143.63035

Geographic Region
GUAM
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2019-10-03 to 2020-01-15
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2151536874-POCLOUD
Data State
COMPLETE
Number of Files/Granules
6
Processing Level
3
Science Keywords
Salinity ,
OCEAN TEMPERATURE PROFILES ,
Water Temperature ,
Potential Density

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Rainville, L. (2021). Adaptive Sampling of Rain and Ocean Salinity from Autonomous Seagliders (Guam 2019-2020) Version 1.0 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/ASROS-GLGU1 Date Accessed: 2025-12-14

Documents

USER'S GUIDE

READ-ME

DATA CITATION GUIDELINES

GENERAL DOCUMENTATION

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
CT Conservative Temperature (ITS-90) degrees Celsius float N/A N/A 1
dive Dive number for observations N/A short N/A N/A 1
lat latitude of every sample point, from the flight model when underwater degrees_north float N/A N/A 1
lat_dive average latitude of the dive degrees_north float N/A N/A 1
lon longitude of every sample point, from the flight model when underwater degrees_east float N/A N/A 1
lon_dive average longitude of the dive degrees_east float N/A N/A 1
N_S number of observations in the bin N/A short N/A N/A 1
N_T number of observations in the bin N/A short N/A N/A 1
N_time number of observations in the bin N/A short N/A N/A 1
P pressure dBar float N/A N/A 1
PD Potential density kg/m3 float N/A N/A 1
S corrected salinity, with outliers removed, interpolated interpolated over gaps < 50.0m PSU float N/A N/A 1
SA Absolute salinity g/kg float N/A N/A 1
speed forward speed of the glider through the water from the flight model meters/second float N/A N/A 1
surface_curr_east surface current in the east direction from the gps track meters/second float N/A N/A 1
surface_curr_north surface current in the north direction from gps track meters/second float N/A N/A 1
S_flags qc flag for salinity: 0 no data (interpolated), 0.5 outside despiker, 1 is good N/A byte N/A N/A 1
S_L2 level 2 salinity (no despiker, not interpolated), with basestation processing (qc_good) PSU float N/A N/A 1
S_ref low-pass filtered salinity, 5.0 days and 10.0 m PSU float N/A N/A 1
S_rms_ref rms of salinity within smoothing window (high-freq variance). Despiker removes data more than 3.0 deviations for mean PSU float N/A N/A 1
T corrected in-situ temperature, with outliers removed, interpolated over gaps < 50.0m degrees_Celsius float N/A N/A 1
time date in seconds for every sample point, interpolated seconds since 1970-1-1 00:00:00 double N/A N/A 1
T_flags qc flag for temperature: 0 no data (interpolated), 0.5 outside despiker, 1 is good N/A byte N/A N/A 1
T_L2 level 2 temperature (no despiker, not interpolated), with basestation processing (qc_good) degrees_Celsius float N/A N/A 1
T_ref low-pass filtered temperature, 5.0 days and 10.0 m degrees_Celsius float N/A N/A 1
T_rms_ref rms of temperature within smoothing window (high-freq variance). Despiker removes data more than 3.0 deviations for mean [deg C] degrees_Celsius float N/A N/A 1
u_dive depth-average current in the east direction from the flight model meters/second float N/A N/A 1
v_dive depth-average current in the north direction from the flight model meters/second float N/A N/A 1
z depth meters float N/A N/A 1
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