Difference between revisions of "NOAA OISST"

 
Line 10: Line 10:
 
NOAA has changed the delivery mode of this dataset in 2017, they also switched to netcdf4 format: "data from 1 April 2017 onward are in netCDF4 (with internal compression, so files will not be named *.gz) format. Older files are still netCDF3, until further notice." 
 
NOAA has changed the delivery mode of this dataset in 2017, they also switched to netcdf4 format: "data from 1 April 2017 onward are in netCDF4 (with internal compression, so files will not be named *.gz) format. Older files are still netCDF3, until further notice." 
  
<span style="color:#e74c3c;">NB there is a potential bias introduced in data from 2017 onwards, NOAA has recently released a new corrected version v2.1</span>
+
<span style="color:#e74c3c;">NB there is a potential bias introduced in data from 2017 onwards for v2.0, NOAA has recently released a new corrected version v2.1</span>
  
 
[https://www.ncdc.noaa.gov/oisst/optimum-interpolation-sea-surface-temperature-oisst-v21 https://www.ncdc.noaa.gov/oisst/optimum-interpolation-sea-surface-temperature-oisst-v21]
 
[https://www.ncdc.noaa.gov/oisst/optimum-interpolation-sea-surface-temperature-oisst-v21 https://www.ncdc.noaa.gov/oisst/optimum-interpolation-sea-surface-temperature-oisst-v21]
  
The new version has been donwloading from 2016 onwards, we're not sure yet if the previous years will be made available and when.
+
Initially this version was available only from 2016 onwards, as of the 21st of May the all v2.1 series is available, from 1981 to present day.
  
A new concatenated version is available using v2-0 for years 1981-2015 and v2.1 for years 2016-2020.
+
Also, the initial release had a timestep issue so some files were off by 12 hours, this has been fixed int he current release.&nbsp;
 
 
Since the bias was present from 2017 onwards there shouldn't be issue using the older files for previous years.
 
  
 
=== <span style="font-family:Arial,Helvetica,sans-serif;">'''License'''</span> ===
 
=== <span style="font-family:Arial,Helvetica,sans-serif;">'''License'''</span> ===
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<span class="s1">/g/data/ua8/NOAA_OISST/AVHRR/v2-0_modified/<files></span>
 
<span class="s1">/g/data/ua8/NOAA_OISST/AVHRR/v2-0_modified/<files></span>
  
<span class="s1">/g/data/ua8/NOAA_OISST/AVHRR/v2-1_modified/<files> *</span>
+
<span class="s1">/g/data/ua8/NOAA_OISST/AVHRR/v2-1_modified/<files>&nbsp;</span>
 
 
<span class="s1">* NB this currently has proper v2.1 files only from 2016-2020 for 1981 to 2015 data is not yet available but it should be safe to use v2.0.</span>
 
 
 
<span class="s1">Links to v2.0_modified &nbsp;are provided in the same directory for ease of use.</span>
 
  
 
[[Category:Dataset]] [[Category:Clex-managed-data]]
 
[[Category:Dataset]] [[Category:Clex-managed-data]]

Latest revision as of 18:56, 21 May 2020

The NOAA 1/4° daily Optimum Interpolation Sea Surface Temperature (or daily OISST) is an analysis constructed by combining observations from different platforms (satellites, ships, buoys) on a regular global grid. A spatially complete SST map is produced by interpolating to fill in gaps. More information from the NOAA website.

We have a local copy, updated daily of the AVHRR-Only OISST, which uses infrared satellite data from the Advanced Very High Resolution Radiometer (AVHRR).

The data covers from September 1981 till present, with daily temporal resoultion.

The scripts used to download and concatenate the data are available from the CMS github .

NOAA has changed the delivery mode of this dataset in 2017, they also switched to netcdf4 format: "data from 1 April 2017 onward are in netCDF4 (with internal compression, so files will not be named *.gz) format. Older files are still netCDF3, until further notice." 

NB there is a potential bias introduced in data from 2017 onwards for v2.0, NOAA has recently released a new corrected version v2.1

https://www.ncdc.noaa.gov/oisst/optimum-interpolation-sea-surface-temperature-oisst-v21

Initially this version was available only from 2016 onwards, as of the 21st of May the all v2.1 series is available, from 1981 to present day.

Also, the initial release had a timestep issue so some files were off by 12 hours, this has been fixed int he current release. 

License

This dataset is freely available, there are no use limitations or accounts needed. Although there is an optional registration form that can be reached from the documentation page in the NOAA website under the "data access" session. Please consider register, so you'll receive updates on the data and as this also helps the data publishers to get an idea of the data usefulness and continue providing for public access. Use the following publications to cite the dataset:

Huang, B., C. Liu, V. Banzon, E. Freeman, G. Graham, W. Hankins, T. Smith, and H.-M. Zhang, 2020: Improvements of the Daily Optimum Sea Surface Temperature (DOISST) - Version 2.1. (J. Climate, submitted). (for v2.1)

Banzon, V., Smith, T. M., Chin, T. M., Liu, C., and Hankins, W., 2016: A long-term record of blended satellite and in situ sea-surface temperature for climate monitoring, modeling and environmental studies. Earth Syst. Sci. Data, 8, 165–176, doi:10.5194/essd-8-165-2016(link is external). Reynolds, R. W., T. M. Smith, C. Liu, D. B. Chelton, K. S. Casey, and M. G. Schlax, 2007: Daily high-resolution-blended analyses for sea surface temperature. Journal of Climate, 20, 5473–5496, doi:10.1175/JCLI-D-14-00293.1(link is external).

OISST on raijin

This dataset is available on raijin under the ua8 project (NB this might change in the near future because of the NCI data re-organisation). The original data is located in

/g/data/ua8/NOAA_OISST/AVHRR/raw/<year>/<files.gz>. for v2.0

/g/data/ua8/NOAA_OISST/AVHRR/v2-1/<year>/<files>

NB the v2-0 files are zipped as when downloaded.

The files are then concatenated for ease of use into yearly files, the resulting modified dataset is available under

/g/data/ua8/NOAA_OISST/AVHRR/v2-0_modified/<files>

/g/data/ua8/NOAA_OISST/AVHRR/v2-1_modified/<files>