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Extracting NOAA sea surface temperatures with ncdf4

I’ve written previously about some example R scripts I created to extract sea surface temperature data from NOAA’s Optimum Interpolated Sea Surface Temperature products. If you want daily global sea surface temperatures on a 0.25×0.25° grid, they gather those into 1-year files available at http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.oisst.v2.highres.html. If you want weekly average SST values on a 1×1° grid, you can get those back to 1981 at http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.oisst.v2.html. If you just want a smaller file for a single day on the 0.25×0.25° grid, you can find those at http://www.ncdc.noaa.gov/sst/griddata.php.

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NOAA OISST v2 High Resolution daily sea surface temperatures with R

Update, 2015-11-30 It appears that NOAA has gone through and upgraded all of the OISST files to the newer version of the NetCDF file format. As a result, the functions outlined in this post don’t work any longer. Instead, see the updated functions in my newer post, http://lukemiller.org/index.php/2014/11/extracting-noaa-sea-surface-temperatures-with-ncdf4/. The concepts are the same as described here, but the newer functions use the ncdf4 package to access the newer NetCDF file format.

The National Ocean and Atmospheric Administration generates freely-available world-wide estimates of mean daily sea surface temperature, and has been doing so back to 1981. The data are on … Continue Reading

Archived water and air temperatures for Nahant, MA

I’ve added the archived temperature data for the Marine Science Center to my current conditions page: http://www.lukemiller.org/seawater/. The complete timeseries, with some large breaks when the monitoring computer was shut down, can be downloaded in this csv file: 2010-2012_MSC_temps.csv (5MB, right-click and save-as). There are three columns, with the timestamps in Eastern Standard Time (UTC-5, no daylight savings adjustment), water temperature and air temperature in degrees Celsius. Missing data are recorded as NA.

Temperatures for July 2010 through May 2012 Temperatures for July 2010 through … Continue Reading

Extracting sea surface temperatures from NOAA’s OISSTv2

Update, 2015-11-30 It appears that NOAA has gone through and upgraded all of the OISST files to the newer version of the NetCDF file format. As a result, the functions outlined in this post don’t work any longer. Instead, see the updated functions in my newer post, http://lukemiller.org/index.php/2014/11/extracting-noaa-sea-surface-temperatures-with-ncdf4/. The concepts are the same as described here, but the newer functions use the ncdf4 package to access the newer NetCDF file format.

Sea surface temperatures

NOAA’s Physical Sciences Division produces a global map of weekly averaged sea … Continue Reading