edu.ucar.opensky::technotes:542 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T02:41:16.307257 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7bz67qg NCAR GPS Dropsonde Humidity Dry Bias 2016-10-14T00:00:00Z publication https://n2t.org/ark:/85065/d7bz67qg https://doi.org/10.5065/D6XS5SGX Vömel, Holger author Young, Kathryn author Hock, Terrence F. author UCAR/NCAR - Library publisher A dry bias in the RD94, mini dropsonde (NRD94) and Driftsonde MIST sonde humidity measurements has been discovered, which has existed since 2008. This document describes the background of the dry bias, how to identify impacted files, how to correct existing data, and how to implement a correction in AVAPS®. The Atmospheric Sounding Processing Environment (ASPEN) starting with version 3.3-236 is used to correct this dry bias both in reprocessing of existing raw data (i.e. D-files) as well as in real-time data acquisition. The correction has also been implemented into the AVAPS data acquisition software starting with version 3.9.5. This version must only be used, if ASPEN version 3.3-236 or later is used at the same time to make sure that the correction is properly documented. Double correction will not occur when using both updated programs (AVAPS 3.9.5 and ASPEN 3.3-236). Users must upgrade ASPEN to version 3.3-236 or higher and should upgrade AVAPS to version 3.9.5 or higher. Existing files in the D-, EOL-, and FRD format can be corrected using the python script aspenfixrh in the linux environment. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Humidity Water vapor profiles theme U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2021-09-17 revision 11.2 NASA Global Change Master Directory originator Valids List: Science and Services Keywords Copyright 2016 Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation