A note on boundary layer friction in baroclinic cyclones

\bibitem[Adamson {\em et~al.\ }(2006)]{AdaBHP06} Adamson, D.~S., Belcher, S.~E., Hoskins, B.~J., and Plant, R.~S. (2006). \newblock Boundary-layer friction in midlatitude cyclones. \newblock {\em Q. J. R. Meteorol. Soc.}, {\bf 132}, 101--124. \bibitem[Beare(2007)]{Bea07} Beare, R.~J. (2007). \newblock Boundary layer mechanisms in extratropical cyclones. \newblock {\em Q. J. R. Meteorol. Soc.}, {\bf 133}, 503--515. \bibitem[Cooper {\em et~al.\ }(1992)]{CooTB92} Cooper, I.~M., Thorpe, A.~J., and Bishop, C.~H. (1992). \newblock The role of diffusive effects on potential vorticity in fronts. \newblock {\em Q. J. R. Meteorol. Soc.}, {\bf 118}, 629--647. \bibitem[Plant and Belcher(2007)]{PlaB07} Plant, R.~S. and Belcher, S.~E. (2007). \newblock Numerical simulation of baroclinic waves with a parameterized boundary layer. \newblock {\em {J. Atmos. Sci.}} In press. \bibitem[Shapiro and Keyser(1990)]{ShaK90} Shapiro, M.~A. and Keyser, D. (1990). \newblock Fronts, jet streams and the tropopause. Pp 167--191 \newblock in {\em Extratropical Cyclones: The Erik Palm\'en Memorial Volume}. Amer. M eteorol. Soc: Boston. \bibitem[Thorncroft {\em et~al.\ }(1993)]{ThoHM93} Thorncroft, C.~D., Hoskins, B.~J., and McIntyre, M.~E. (1993). \newblock Two paradigms of baroclinic-wave life-cycle behaviour. \newblock {\em Q. J. R. Meteorol. Soc.}, {\bf 119}, 17--55.