@article{Schwartz_2015, title={Climatology and variability of trace gases in extratropical double‐tropopause regions from MLS, HIRDLS, and ACE‐FTS measurements}, volume={120}, ISSN={2169-8996}, url={http://dx.doi.org/10.1002/2014JD021964}, DOI={10.1002/2014jd021964}, number={2}, journal={Journal of Geophysical Research: Atmospheres}, publisher={American Geophysical Union (AGU)}, author={Schwartz, M. J. and Manney, G. L. and Hegglin, M. I. and Livesey, N. J. and Santee, M. L. and Daffer, W. H.}, year={2015}, month=jan, pages={843–867} }