Search Results

You are looking at 1 - 10 of 17 items for :

  • Tropical Cyclone Intensity Experiment (TCI) x
  • All content x
Clear All
Yi Dai, Sharanya J. Majumdar, and David S. Nolan

be deflected by the shallow layer of TC outflow. Recently, using an idealized modeling framework, Dai et al. (2019) concluded that the primary TC rainband is a significant source of the outflow, thereby allowing the eyewall to be “protected” from the environmental shear flow (in their case, an upper-level westerly jet). In parallel, Ryglicki et al. (2019) used a detailed series of diagnostics to persuasively argue that the unexpected rapid intensification of Hurricane Matthew (2016) was due

Restricted access
David R. Ryglicki, Daniel Hodyss, and Gregory Rainwater

.ucar.edu/people/bryan/cm1/cm1_equations.pdf . Chen , T.-C. , and A. C. Wiin-Nielsen , 1976 : On the kinetic energy of the divergent and nondivergent flow in the atmosphere . Tellus , 28 , 486 – 498 , https://doi.org/10.3402/tellusa.v28i6.11317 . 10.3402/tellusa.v28i6.11317 Cho , J. Y.-K. , and L. M. Polvani , 1996 : The emergence of jets and vortices in freely evolving, shallow-water turbulence on a sphere . Phys. Fluids , 8 , 1531 – 1552 , https://doi.org/10.1063/1.868929 . 10

Restricted access
Patrick Duran and John Molinari

radial wind [first term on the right-hand side of Eq. (6) ] also acted within the outflow jet. For example, horizontal advection provided forcing for destabilization at the 16-km level almost everywhere inside of the 140-km radius. Outside of this radius near 16 km, however, existed a region of forcing for stabilization. This switch in signs can be explained by a reversal of the radial gradient of mean near the 140-km radius ( Fig. 4b ). Inside of that radius, and , which corresponds to forcing

Full access
Yi Dai, Sharanya J. Majumdar, and David S. Nolan

as upper-level troughs and westerly jets can interact strongly with the TC. Whether the environmental flow is beneficial or detrimental to TC development depends mainly on the relative strength of the environmental features and the TC, and the distance between them ( Hanley et al. 2001 ; Peirano et al. 2016 ). In those papers, the TC development means the axisymmetric response of the TC to the environmental flow. The eddy flux momentum convergence (EFC) is a good indicator of TCEFI, with the

Full access
William A. Komaromi and James D. Doyle

circulation and/or the right-entrance region of a jet streak act to strengthen the secondary circulation associated with the vortex itself ( Rodgers et al. 1991 ; Shi et al. 1997 ; Hanley et al. 2001 ; Merrill 1988a , b ; Fischer et al. 2017 ). Sadler (1976) suggested that favorable TC interactions with upper-level troughs act to enhance upper-level divergence and establish a connection between the TC outflow and large-scale westerlies, ventilating and thereby strengthening the cyclone. Similarly

Full access
David R. Ryglicki, James D. Doyle, Daniel Hodyss, Joshua H. Cossuth, Yi Jin, Kevin C. Viner, and Jerome M. Schmidt

), the upper levels of the TC were able to be analyzed more carefully. Black and Anthes (1971) were able to describe, both quantitatively and qualitatively, the flow around five TCs out to a radius of 1000 km from the storm center. They demonstrated, via Fourier analyses, that the outflow layer of an observed TC is very asymmetric. Qualitatively, they also showed that outflow is favored in jets emanating from the core of the storm. Merrill (1988a) provided a significant step forward in the

Full access
James D. Doyle, Jonathan R. Moskaitis, Joel W. Feldmeier, Ronald J. Ferek, Mark Beaubien, Michael M. Bell, Daniel L. Cecil, Robert L. Creasey, Patrick Duran, Russell L. Elsberry, William A. Komaromi, John Molinari, David R. Ryglicki, Daniel P. Stern, Christopher S. Velden, Xuguang Wang, Todd Allen, Bradford S. Barrett, Peter G. Black, Jason P. Dunion, Kerry A. Emanuel, Patrick A. Harr, Lee Harrison, Eric A. Hendricks, Derrick Herndon, William Q. Jeffries, Sharanya J. Majumdar, James A. Moore, Zhaoxia Pu, Robert F. Rogers, Elizabeth R. Sanabia, Gregory J. Tripoli, and Da-Lin Zhang

of absolute angular momentum in the upper troposphere from midlatitude troughs can influence the outflow-layer structure and TC intensity changes in these low-inertial-stability regions ( Merrill 1988b ; Molinari and Vollaro 1989 ). The induced secondary circulation associated with upper-tropospheric TC outflow varies, depending on the outflow-layer characteristics. Of special importance is the azimuthal asymmetry of the outflow layer, commonly seen in the form of outflow jet streaks emanating

Open access
Peter Black, Lee Harrison, Mark Beaubien, Robert Bluth, Roy Woods, Andrew Penny, Robert W. Smith, and James D. Doyle

index (RII; DeMaria and Kaplan 1999 ; DeMaria et al. 2005 ; Knaff et al. 2005 ; Jones et al. 2006 ; DeMaria 2009 , 2010 ; Kaplan et al. 2010 ). These models stand to benefit from improved model and observational spatial and temporal resolution. Enhanced model resolution of smaller-scale physical processes, such as convective events, boundary layer air–sea transfer processes, and upper-troposphere outflow jets, will likely benefit to a greater degree from observational inputs at commensurate

Full access
William A. Komaromi and James D. Doyle

downshear right ( Merrill 1988a ). A number of studies ( Sadler 1976 , 1978 ; Merrill and Velden 1996 ) also found an association between TCs with multiple outflow channels and intensification. Additionally, Merrill and Velden (1996) found an increase in the height of the level of strongest outflow as well as an increase in the vertical depth of the outflow layer during the intensification of Super Typhoon Flo (1990). Their results show the equatorward outflow jet maximum to occur at a higher level

Full access
Russell L. Elsberry, Eric A. Hendricks, Christopher S. Velden, Michael M. Bell, Melinda Peng, Eleanor Casas, and Qingyun Zhao

) field. Model dynamics will then adjust the mean and asymmetric wind fields, which in the lower model levels will take into account the planetary boundary layer frictional effects and enthalpy fluxes. Whereas these internal adjustments will determine the intensity change, the TC vortex dynamics and physics prediction are expected to also improve the interaction between the vortex and its environment in conjunction with the better depiction of the outflow jets from the high temporal and spatial

Full access