NDACC News and Events
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.
The resolution from the International Association of Meteorology and Atmospheric Sciences (IAMAS) was released on November 22, 2017. This resolution specifically stresses the importance of continuation and enhancement of Earth Observation systems to monitor the atmosphere, ocean and other elements of the Earth system. It therefore strongly supports the effort of the NDACC steering committee, associated networks and data PIs to provide high quality and long-term observations for monitoring of atmospheric composition.
The annual meeting of the international Steering Committee (SC) for NDACC was held 6-10 November 2017 in Boulder, CO, USA at the National Center for Atmospheric Research (NCAR). James Hannigan of NCAR hosted the meeting. Dr. James Hurrell, a climate scientist and Director of NCAR, welcomed the attendees and gave a brief introduction to the Center’s facilities, mission, and associated programs in atmospheric and related sciences.