Search Results

You are looking at 1 - 7 of 7 items for :

  • Diabatic Influence on Mesoscale Structures in Extratropical Storms (DIAMET) x
  • All content x
Clear All
G. Lloyd, C. Dearden, T. W. Choularton, J. Crosier, and K. N. Bower

). Matejka et al. (1980) investigated the microphysics of different frontal bands and, in some cases, highlighted the importance of microphysical and mesoscale convective processes that had a direct influence on the formation and spatial distribution of precipitation. For example, below the narrow convective updraft of an NCFR, precipitation is suppressed through suspension or upward movement of hydrometeors. Crosier et al. (2014) found that production of small secondary ice crystals through rime

Full access
C. Dearden, G. Vaughan, T. Tsai, and J.-P. Chen

, with a freezing level around 3 km, a similar range of crystal habits throughout the depth of the cloud, and evidence of secondary ice crystal production via rime splintering. However, IOP 14 was unusually deep for the time of year, with a sea level pressure minimum of 978 hPa compared to 998 hPa in the July case. IOP 14 also exhibited a distinct squall-line feature, producing generally higher precipitation rates than IOP 13, and a prominent potential vorticity (PV) tower as discussed later in

Full access
G. Vaughan, J. Methven, D. Anderson, B. Antonescu, L. Baker, T. P. Baker, S. P. Ballard, K. N. Bower, P. R. A. Brown, J. Chagnon, T. W. Choularton, J. Chylik, P. J. Connolly, P. A. Cook, R. J. Cotton, J. Crosier, C. Dearden, J. R. Dorsey, T. H. A. Frame, M. W. Gallagher, M. Goodliff, S. L. Gray, B. J. Harvey, P. Knippertz, H. W. Lean, D. Li, G. Lloyd, O. Martínez–Alvarado, J. Nicol, J. Norris, E. Öström, J. Owen, D. J. Parker, R. S. Plant, I. A. Renfrew, N. M. Roberts, P. Rosenberg, A. C. Rudd, D. M. Schultz, J. P. Taylor, T. Trzeciak, R. Tubbs, A. K. Vance, P. J. van Leeuwen, A. Wellpott, and A. Woolley

Plant 2014 ), air–sea fluxes ( Cook and Renfrew 2014 ), and microphysics ( Dearden et al. 2014 ; Lloyd et al. 2014 ) in numerical weather prediction models; and addressing fundamental aspects of predictability using ensembles, and improving data assimilation methods for better short-term forecasting ( Baker et al. 2014 ). The scientific approach of DIAMET concentrates on the effect of diabatic processes on the distribution of potential vorticity (PV) and its consequences for the evolution of

Open access
Oscar Martínez-Alvarado, Laura H. Baker, Suzanne L. Gray, John Methven, and Robert S. Plant

the S2 airstream (56°N; 600–800 hPa) is characterized by lower RH ice (50%–80%). b. Identifying airstreams with distinct composition using the aircraft data The FAAM aircraft conducted three level runs on a descending stack through the strong wind region south of the cyclone, just to the west of Scotland. The legs were over the sea between the islands of Islay and Tiree (Vaughan et al. 2014, manuscript submitted to Bull. Amer. Meteor. Soc. ) perpendicular to the mesoscale cloud banding. Figure

Full access
Oscar Martínez-Alvarado, Suzanne L. Gray, and John Methven

sea level pressure) on 24 February 1987, Stoelinga (1996) showed that its intensity was 70% stronger as a result of coupling between baroclinic wave growth and latent heat release. Until now, studies on latent heat release and cyclone intensification have focused on Northern Hemisphere extratropical cyclones occurring mostly during wintertime (December–February), but also during spring (March–May) and autumn (September–November). On the other hand, the importance of latent heat release, and

Full access
Geraint Vaughan, Bogdan Antonescu, David M. Schultz, and Christopher Dearden

specific humidity; Gage and Green (1978) ], wind shear, and wind speed (e.g., Rao et al. 2008 ; Antonescu et al. 2013 ). b. Campaign observations On 16 September 2011, during TROSIAD and DIAMET IOP 1, the Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 research aircraft was used to measure in situ meteorological data, microphysics, and chemical species over Ireland and the Irish Sea [the aircraft and instruments are described in Vaughan et al. (2015) ]. Detailed observations of the

Full access
David M. Schultz and Joseph M. Sienkiewicz

of strong winds occurred within the larger region of strong winds surrounding the cyclone, as well as at and downstream of the strongest horizontal pressure gradient ( Fig. 2c ). The shape of the sting jet at the surface expanded downstream, parallel to and along the frontolysis ( Fig. 2d ). Fig . 2. (a),(c),(e) Sea level pressure (thick solid lines every 4 hPa), 925-hPa potential temperature (green lines every 2 K), and 925-hPa wind speed (m s −1 , shaded according to scale at the left side of

Full access