Regional Differences in Stratospheric Intrusions over the USA Investigated using the NASA MERRA-2 Reanalysis

K. Emma Knowland, Universities Space Research Association Columbia, Columbia, United States, Lesley Ott, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Kevin Hodges, University of Reading, Reading, United Kingdom, Krzysztof Wargan, Science Systems and Applications, Inc., Lanham, United States and Bryan N Duncan, NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Laboratory, Greenbelt, MD, United States