Articles | Volume 2, issue 1
Research article
18 Jan 2021
Research article |  | 18 Jan 2021

Mid-level convection in a warm conveyor belt accelerates the jet stream

Nicolas Blanchard, Florian Pantillon, Jean-Pierre Chaboureau, and Julien Delanoë

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Organization of convective ascents in a warm conveyor belt
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Weather Clim. Dynam., 1, 617–634,,, 2020
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Cited articles

Blanchard, N., Pantillon, F., Chaboureau, J.-P., and Delanoë, J.: Organization of convective ascents in a warm conveyor belt, Weather Clim. Dynam., 1, 617–634,, 2020. a, b, c, d, e, f, g, h, i, j, k, l, m, n
Browning, K. A.: Mesoscale Aspects of Extratropical Cyclones: An Observational Perspective, in: The Life Cycles of Extratropical Cyclones, edited by, Shapiro, M. A. and Grønås S., American Meteorological Society, Boston, MA, 265–283,, 1999. a
Chagnon, J. M., Gray, S. L., and Methven, J.: Diabatic processes modifying potential vorticity in a North Atlantic cyclone, Q. J. Roy. Meteorol. Soc., 139, 1270–1282,, 2013. a, b
Colella, P. and Woodward, P. R.: The Piecewise Parabolic Method (PPM) for gas-dynamical simulations, J. Comput. Phys., 54, 174–201,, 1984. a
Dauhut, T., Chaboureau, J.-P., Escobar, J., and Mascart, P.: Giga-LES of Hector the Convector and its two tallest updrafts up to the stratosphere, J. Atmos. Sci., 73, 5041–5060,, 2016. a
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Rare aircraft observations in the warm conveyor belt outflow associated with an extratropical cyclone are complemented with convection-permitting simulations. They reveal a complex tropopause structure with two jet stream cores, from which one is reinforced by bands of negative potential vorticity. They show that negative potential vorticity takes its origin in mid-level convection, which indirectly accelerates the jet stream and, thus, may influence the downstream large-scale circulation.