This document describes the format of the data files for the RS92 radiosonde GRUAN data product. GRUAN data products are stored in NetCDF files. The data fields and attributes within the RS92 radiosonde NetCDF files are comprehensively described in this document. The GRUAN data products include raw data, processed data, uncertainty estimates, and selected meta data. The correction algorithms that are applied in the GRUAN processing and the RS92 radiosonde measurements itself are extensively described in Dirksen et al. [2014]. This update to the document describes the release version 2 of the RS92 GRUAN data product (RS92-GDP) which is in operational use since 1 September 2012. This GRUAN data product is published as RS92-GDP.2 [2012].

v2.1.1 (2021-07-14)

Michael Sommer - Small typos and formatting issues are fixed

v2.1 (2021-06-16)

Michael Sommer, Ruud Dirksen and Christoph von Rohden, Brief Description of the RS92 GRUAN Data Product (RS92-GDP), GRUAN-TD-4, v2.1 (2021-06-16).

v2.0 (2016-02-11)

Michael Sommer, Ruud Dirksen and Christoph von Rohden, Brief Description of the RS92 GRUAN Data Product (RS92-GDP), GRUAN-TD-4, v2.0 (2016-02-11).

v1.1 (2011-12-07)

Franz Immler and Michael Sommer, Brief Description of the RS92 GRUAN Data Product (RS92-GDP), GRUAN-TD-4, v1.1 (2011-12-07).

v1.0 (2011-08-22)

Franz Immler and Michael Sommer, Brief Description of the RS92 GRUAN Data Product (RS92-GDP), GRUAN-TD-4, v1.0 (2011-08-22).