IASI Skin Temperature (IASI SkT) is a monthly, 1x1 degree global dataset of *clear sky* skin temperatures over land derived from the IASI satellite radiances data. 

The data was computed using artificial neural networks over a selected set of IASI radiance channels, trained with ERA5-skin temperature product. Emissivity over land is also used as input in the neural network (Safieddine et al., 2020). 

This method was applied to the whole IASI time series to produce a homogeneous skin temperature data record from Sept. 2007 to the present.

The dataset consists of monthly mean TXT files of around 350 KB each. 

Each file is a grid organized by latitude (-90 to 90 °N) and longitude (-180 to 180 °E).

Night and day data are separated based on the ascending (night, around 9:30 PM) and descending nodes (day, around 9:30 AM) 

NOTE #1: Metop a data stops at December 2017. Metop a has been in a drifting orbit (so local crossing time is changing) since June 2017. Since the Tskin is largely affected by the time of the day, and for the datasets to be consistent we advise the users to use Metop b starting 2018.
If you still want Metop a data from 2018 till its end of life (Oct 2021), please contact the product owners (listed at the end here).

Note #2: Metopb has a non-linearity issue between May 2016 and August 2017. We recommend the users to switch to Metop a during this period.

Note #3: some months have weird behavior, for unknown reasons yet (probably related to the radiances delivered by EUMETSAT). Please use the other instrument that functions properly.  

Size of the grid : 180 lines and 360 columns. Separator : comma.

Unit : degree Celsius

DOI: TBC

See latitude.txt and longitude.txt files.

See IASI-Flux_and_Temperature_SST_SkT.pdf (Data Manager Plan, OPIDoR)

Any questions? sarah.safieddine@latmos.ipsl.fr or cathy.clerbaux@latmos.ipsl.fr