2.1 Update on Activities of ACCORD (Atmospheric Chemistry Center for Observational Research and Data)

The ACCORD is a relatively new partnership between NCAR’s Atmospheric Chemistry Observations and Modeling (ACOM) Laboratory, NCAR’s Earth Observing Laboratory, NSF Atmospheric Chemistry, and the University community. Its mission is to build a better alliance between ACOM and University partners to address critical, emerging questions in in situ observational atmospheric chemistry.

ACCORD is governed by a Science Committee (consisting of 6 University and 3 NCAR scientists, and an NSF representative, https://www2.acom.ucar.edu/accord/science-committee) that was formed in spring 2014. A major initial effort was a community workshop (held in Boulder, Spring 2015) that was designed to obtain a bottom-up consensus on major science questions facing our field and the facilities needed to answer these questions. Activities resulting from discussions at the 2015 workshop are now being undertaken, and science ideas developed at the workshop are coming to fruition. Among the activities carried out in 2016, or being planned for the near future, under the ACCORD umbrella include the following:

1) A community workshop on Atmospheric Radiation science, see the summary elsewhere in this Annual Review.

2) A community workshop on Cloud Water chemistry, see the summary elsewhere in this Lab Annual Review.

3) The initiation of an ACCORD Seminar Series hosted by ACOM. Five speakers presented seminars in 2016, and a similar number is planned for 2017. The seminars were given by a diverse group of scientists, ranging from tenured professors to newly-appointed faculty.

4) Planning for a ‘virtual campaign’ on science topics related to biomass burning. One of the ideas put forward at the ACCORD workshop (and echoed by the recent NAS report on the future of atmospheric chemistry) is that there is often insufficient time and funds available to properly analyze and derive scientific conclusions from field campaign data. Thus, ACCORD, ACOM and the International Global Atmospheric Chemistry (IGAC) program are partnering to host a workshop aimed at initiating and promoting the coordinated re-analysis of field campaign data associated with biomass burning. The workshop will be held in Summer 2017 in Boulder.

5) An ACCORD aircraft inlet subcommittee was formed to report on the state of the science regarding aircraft inlets. The committee report is available at the ACCORD website, https://www2.acom.ucar.edu/sites/default/files/accord/InletCommiteeRepor.... A proposal addressing was recently funded by NSF Atmospheric Chemistry, and work is underway ( involving collaboration between NCAR ACOM and EOL, Clarkson University, and Denver University) to develop four new inlets:

a) a new turbulent inlet for the measurement of ‘sticky’ compounds, such as nitric acid, organic acids and ammonia.
b) an inlet for use in the GV large wing-pods, for the measurement of reactive gases and/or radicals.
c) a low turbulence inlet for the sampling of large particles, and possibly for highly reactive gases.
d) a side-facing particle-rejection inlet for accurate sampling of gas-phase compounds.