GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites

(L3S_LEO_PM-STAR-v2.81)

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Version	2.81
Processing Level	3
Start/Stop Date	2002-Jul-04 to Present
Short Name	L3S_LEO_PM-STAR-v2.81
Description	The L3S_LEO_PM-STAR-v2.81 dataset produced by the NOAA Advanced Clear-Sky Processor for Ocean (ACSPO) system derives the Subskin Sea Surface Temperature (SST) from the VIIRSs (Visible Infrared Imaging Radiometer Suite) onboard the Suomi-NPP, NOAA-20 and NOAA-21 satellites and MODIS (Moderate Resolution Imaging Spectroradiometer) onboard the Aqua satellite. The L3S-LEO is a family of multi-sensor super-collated (L3S) gridded 0.02º resolution SST products from low earth orbit (LEO) satellites. The L3S-LEO-PM ( https://doi.org/10.5067/GHLPM-3S281 ) and AM ( https://doi.org/10.5067/GHLAM-3SS28 ) data include SSTs from afternoon (~1:30 am/pm) and mid-morning (~9:30 am/pm) satellites, respectively. The PM and AM SSTs, for both day (D) and night (N), and Terra MODIS SSTs, are further aggregated into a daily L3S-LEO-DY SST product ( https://doi.org/10.5067/GHLDY-3S281 ). This PM SST product is derived by collating individual satellite ACSPO L3U data ( https://doi.org/10.5067/GHVRS-3UO61 , https://doi.org/10.5067/GHV20-3UO61 and https://doi.org/10.5067/GHN21-3U280 ). It covers from 2002-07-04 to present and is reported in 2 files daily, day and night, at 1:30am/pm local time. The SST is in NetCDF4 format, compliant with the GHRSST Data Specification version 2 (GDS2). The v2.81 is updated from the previous v2.80 ( https://doi.org/10.5067/GHLPM-3SS28 ): (1) v2.81 includes 3 VIIRSs (NPP, N20, and N21 from 2023-03-19 - on); (2) Aqua MODIS SST included from 2002-07-04 to 2022-12-31; (3) Time series in v2.81 extended back to 2002-07-04 (from 2012-02-01 in v2.80); (4) recently uncovered VIIRS daytime SST drifts in NPP and N20 SSTs of approximately -0.1 K/decade mitigated. The Near Real Time (NRT) data are available with 6h latency, and replaced by the Re-ANalysis (RAN) files in 2 months, with identical file names. They can be differentiated by the file creation time and ancillary inputs. The data are validated against quality controlled in situ data from the NOAA in situ SST Quality Monitor (iQuam; https://www.star.nesdis.noaa.gov/socd/sst/iquam ), and monitored in another NOAA system, SST Quality Monitor (SQUAM; https://www.star.nesdis.noaa.gov/socd/sst/squam )
DOI	10.5067/GHLPM-3S281
Measurement	OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
Platform/Sensor	Suomi-NPP Platform Name: Suomi National Polar-orbiting Partnership (Suomi-NPP) / VIIRS SENSOR Name: Visible-Infrared Imager-Radiometer Suite (VIIRS) NOAA-20 Platform Name: Joint Polar Satellite System - 1 (NOAA-20) / VIIRS SENSOR Name: Visible-Infrared Imager-Radiometer Suite (VIIRS) NOAA-21 Platform Name: Joint Polar Satellite System - 2 (NOAA-21) / VIIRS SENSOR Name: Visible-Infrared Imager-Radiometer Suite (VIIRS) Aqua Platform Name: Earth Observing System, Aqua (Aqua) / MODIS SENSOR Name: Moderate-Resolution Imaging Spectroradiometer (MODIS)
Project	Group for High Resolution Sea Surface Temperature (GHRSST)
Data Provider	Publisher: PO.DAAC Creator: NOAA/STAR Release Date: 2023-Dec-13
Format	netCDF-4
Keyword(s)	GHRSST, SST, ACSPO, STAR, LEO, v2.81, LEO_PM, NOAA, L3S

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

Resolution Spatial Resolution: 0.02 Decimal Degrees x 0.02 Decimal Degrees Temporal Resolution: Hourly - < Daily Coverage North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2002-Jul-04 to Present Granule Time Span: 2006-Dec-01 to 2025-Oct-22 Projection Ellipsoid: WGS 84

DIRECT ACCESS
Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2805331435-POCLOUD
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2805331435-POCLOUD
DIRECT S3-ACCESS
Available for access in-region with AWS Cloud
Region
us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access. Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login. Most of the time, you'll want to access the protected bucket Information
podaac-ops-cumulus-protected/L3S_LEO_PM-STAR-v2.81/
podaac-ops-cumulus-public/L3S_LEO_PM-STAR-v2.81/
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Name	Long Name	Unit
crs	coordinate reference system
dt_analysis	deviation from SST reference	kelvin
l2p_flags	L2P flags
l3s_sst_reference	l3s sea surface temperature reference	kelvin
lat	latitude	degrees_north
lon	longitude	degrees_east
quality_level	quality level of SST pixel
satellite_zenith_angle	satellite zenith angle	degrees
sea_surface_temperature	sea surface sub-skin temperature	kelvin
sses_bias	SSES bias estimate	kelvin
sses_standard_deviation	SSES standard deviation	kelvin
sst_count	Count of input L3U SST pixels	1
sst_dtime	time difference from reference time	seconds
sst_front_position	Binary SST front position indicator
sst_gradient_magnitude	SST gradient magnitude value	kelvin/km
sst_source	Source of major (highest weight) contribution to sst
time	reference time of sst file	seconds since 1981-01-01 00:00:00
wind_speed	wind speed	m s-1

DATA CITATION GUIDELINES
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Guidelines
USER'S GUIDE
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/ghrsst/open/docs/GDS20r5.pdf GHRSST Data User Guide
PRODUCT QUALITY ASSESSMENT
https://www.star.nesdis.noaa.gov/socd/sst/squam/ The SST Quality Monitor (SQUAM)
https://www.star.nesdis.noaa.gov/socd/sst/arms/ ACSPO Regional Monitor for SST (ARMS)
https://www.star.nesdis.noaa.gov/sod/sst/iquam/ In situ SST Quality Monitor (iQuam)
GENERAL DOCUMENTATION
https://podaac.jpl.nasa.gov/forum/ PO.DAAC Forum Page
DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers

Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.

Citation

NOAA/STAR. 2023. GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites. Ver. v2.81. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GHLPM-3S281

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For more information see Data Citations and Acknowledgments.

Journal Reference

O. Jonasson, I. Gladkova, A. Ignatov, Y. Kihai. 2021. Algorithmic improvements and consistency checks of the NOAA global gridded super-collated SSTs from low Earth orbiting satellites ACSPO L3S-LEO, SPIE Defense + Commercial Sensing 2021. https://doi.org/10.1117/12.2585819

O. Jonasson, I. Gladkova; A. Ignatov, Y. Kihai. 2022. JPSS VIIRS SST Reanalysis Version 3, Remote Sens., 14, 14. https://doi.org/10.3390/rs14143476

O. Jonasson, A. Ignatov, V. Pryamitsyn, B. Petrenko, Y. Kihai. 2023. NOAA MODIS SST Reanalysis Version 1, Remote Sens., 15, 23. https://doi.org/10.3390/rs15235589

Cloud Enabled

Status:

ACTIVE

Short Name:

L3S_LEO_PM-STAR-v2.81

Collection Concept ID:

C2805331435-POCLOUD

Spatial Coverage:

N: 90°

S: -90°

E: 180°

W: -180°

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Capabilities:

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PO.DAAC Data Subscriber

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                        Simple: podaac-data-downloader -c L3S_LEO_PM-STAR-v2.81 -d ./data --start-date 2002-07-04T00:00:00Z --end-date 2002-07-11T00:00:00Z -e ""
Download by Spatial and Temporal Search: podaac-data-downloader -c L3S_LEO_PM-STAR-v2.81 -d ./data --start-date 2002-07-04T00:00:00Z --end-date 2002-07-11T00:00:00Z -b="-180,-90,180,90"
Download by Extension: podaac-data-downloader -c L3S_LEO_PM-STAR-v2.81 -d ./data --start-date 2002-07-04T00:00:00Z --end-date 2002-07-11T00:00:00Z -e .nc
Download recent data (360 min.): podaac-data-subscriber -c L3S_LEO_PM-STAR-v2.81 -d ./data -m 360
Download recent data (1440 min.): podaac-data-subscriber -c L3S_LEO_PM-STAR-v2.81 -d ./data -m 1440

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Harmony subsetter

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                        https://harmony.earthdata.nasa.gov/C2805331435-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?subset=lat(minLat:maxLat)&subset=lon(minLon:maxLon)&subset=time(startTime:stopTime)&format=application%2Fx-netcdf4

Direct S3-Access

Available for access in-region with AWS Cloud

Region:

us-west-2

Bucket/Object Prefix Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access.

Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login.

Most of the time, you'll want to access the protected bucket Information

podaac-ops-cumulus-protected/L3S_LEO_PM-STAR-v2.81/

podaac-ops-cumulus-public/L3S_LEO_PM-STAR-v2.81/

AWS S3 Credentials

Get AWS S3 Credentials | Documentation

Data Recipes:

Generic Data Readers

PO.DAAC

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GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites

GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites

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GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites

GHRSST NOAA/STAR ACSPO v2.81 0.02 degree L3S Dataset from Afternoon LEO Satellites

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