SHADOZ (Southern Hemisphere ADditional OZonesondes), an NDACC Cooperating Network, is a NASA project to augment and archive balloon-borne ozonesonde launches, and to archive data from tropical and remote operational sites.
The last two SHADOZ newsletters came out in late 2017 (#23) and May 2018 (#24). These, and all previous issues, are available at: https://tropo.gsfc.nasa.gov/shadoz/Newsletter.html.
SHADOZ (an NDACC Cooperating Network) data have been re-processed over the past 2-3 years with four papers documenting the activity and evaluating changes in the data and uncertainties as follows. You may be able to download some of the articles directly from the publisher. Otherwise, all are downloadable at the website: https://tropo.gsfc.nasa.gov/shadoz/SHADOZ_PubsList.html.
Ozonesonde data are among the most popular observations in NDACC because the profiles are a mainstay of satellite calibration and are used to develop climatologies used in atmospheric chemical-climate models. Sonde data are used for analysis of lower stratospheric ozone trends, where satellites alone often do a poor job. However, the ozonesonde instrument that is used at ~100 stations worldwide shows biases at different stations and discontinuities in profile time-series due to a variety of measurement procedures.
As part of the SPARC (Stratosphere-troposphere Processes And their Role in Climate) water vapour assessment (WAVAS-II), satellite measurements taken from, or coincident with, seven sites from which ground-based microwave instruments measured water vapor in the middle atmosphere. Six of the ground-based instruments are part of the Network for the Detection of Atmospheric Composition Change (NDACC) and provide datasets which can be used for drift and trend assessment.
