LAUSR

The authors would like to acknowledge the support of the SABER retrieval team providing the version 2.0 data, including scientists from GATS, Inc., NASA Langley Research Center, NASA Goddard Space Flight Center, Spain (IAA), and Arcon, Inc. The SABER CO 2 data used in this study are available to the public in the form of NetCDF files at ftp://saber.gats-inc.com/Version2_0/Level2C/. More information about WACCM can be found at https://www2.acom.ucar.edu/gcm/waccm.The SD-WACCM outputs are available on NCAR's High Performance Storage System. The MERRA data can be obtained from http://disc.sci.gsfc.nasa.gov/daac-bin/DataHoldings.pl.This research was carried out at the Hampton University and Max-Planck-Institut fur Sonnensystemforschung. L. R. acknowledges financial support from the Priority Program 1788 Dynamic Earth of the German Research Foundation (DFG). J. Y. is supported by NASA grants NNX14AF20G, NNH13ZDA001N-HGI, and NNH15ZDA001N-HSR. J. Y. is grateful to Liying Qian, Quan Gan, and Anne Smith for valuable discussions. J. Y. is also supported by the ISSI team >Climate Change in the Upper Atmosphere>. M. L.-P. has been supported by the Spanish MICINN under projects ESP2014-54362-P and ESP2017-87143-R and EC FEDER funds.