In order to reduce the long term stability uncertainty of the GMSL, an alternative WTC derived from highly stable water vapour climate data records (CDRs) from independent measurements on board meteorological satellites is proposed. The atmosphere water vapour content is converted into wet troposphere correction using a polynomial model. The CDR-derived WTC product provides the CDR-derived global mean WTC (GMWTC) computed using two water vapour CDRs, namely REMSS (http://www.remss.com/measurements/atmospheric-water-vapor/tpw-1-deg-product/) and HOAPS (https://wui.cmsaf.eu).