Weinstock, E., J. V. Pittman, D. Sayres, J. B. Smith, J. Anderson, S. C. Wofsy, I. Xuerref, C. Gerbig, B. Daube, L. Pfister, E. Richard, B. Ridley, A. Weinheimer, H. Jost, J. P. Lopez, M. Loewenstein, and T. L. Thompson (2007), Quantifying the impact of the North American monsoon and deep midlatitude convection on the subtropical lowermost stratosphere using in situ measurements, J. Geophys. Res., 112, D18310, doi:10.1029/2007JD008554.