Inflow Layer Energetics of Hurricane Bonnie (1998) near Landfall

Wroe, Derek R.; Barnes, Gary M.
August 2003
Monthly Weather Review;Aug2003 Parts 1 and 2, Vol. 131 Issue 8, p1600
Academic Journal
On 26 August 1998, a NOAA WP-3D aircraft executed a curved track that mimics an inflow trajectory to the eyewall of Hurricane Bonnie. Global positioning system (GPS) sondes and airborne expendable bathyther-mographs jettisoned along the trajectory provide the observations to conduct an energy budget for the 1600-m-deep inflow to the eyewall. Surface fluxes are estimated via the bulk aerodynamic equations and the flux at the top of the inflow is solved as a residual. From 170- to 125-km radial distance from the circulation center the mean θ[SUBe] of the inflow remains constant despite combined sensible and latent surface fluxes in excess of 500 W m[SUP-2]. Convective cells remove energy from the inflow boundary layer at a rate similar to the inputs from the sea. From 125 to 100 km, in the annulus adjacent to the eyewall, mean θ[SUBe] increases 4.5 K in response to higher surface fluxes and little loss through the inflow top. Energy balance may be achieved by either entrainment of higher θ[SUBe] through the top of the inflow layer, or by inclusion of just half the estimated heat from viscous dissipation. The authors infer that the secondary circulation of the eyewall inhibits convective cells from forming in this region and thus facilitates the rapid increase of energy in the inflow. The results support hypotheses that hurricane intensity appears to be strongly modulated by energy exchange in a meso-β region adjacent to and under the eyewall.


Related Articles

  • Objective Analysis of Tropical Cyclone Location and Motion from High-Density Observations. Kepert, Jeffrey D. // Monthly Weather Review;Aug2005, Vol. 133 Issue 8, p2406 

    A new technique for objectively locating the pressure center of a hurricane from high-density observations is presented. It was designed particularly for use with global positioning system (GPS) dropsonde observations of pressure within the cyclone core, but is also useful for aircraft data....

  • GPS Dropwindsonde Wind Profiles in Hurricanes and Their Operational Implications. Franklin, James L.; Black, Michael L.; Valde, Krystal // Weather & Forecasting;Feb2003, Vol. 18 Issue 1, p32 

    The recent development of the global positioning system (GPS) dropwindsonde has allowed the wind and thermodynamic structure of the hurricane eyewall to be documented with unprecedented accuracy and resolution. In an attempt to assist operational hurricane forecasters in their duties,...

  • Hurricane Surface Wind Measurements from an Operational Stepped Frequency Microwave Radiometer. Uhlhorn, Eric W.; Black, Peter G.; Franklin, James L.; Goodberlet, Mark; Carswell, James; Goldstein, Alan S. // Monthly Weather Review;Sep2007, Vol. 135 Issue 9, p3070 

    For the first time, the NOAA/Aircraft Operations Center (AOC) flew stepped frequency microwave radiometers (SFMRs) on both WP-3D research aircraft for operational hurricane surface wind speed measurement in 2005. An unprecedented number of major hurricanes provided ample data to evaluate both...

  • Observed Boundary Layer Wind Structure and Balance in the Hurricane Core. Part II: Hurricane Mitch. Kepert, Jeffrey D. // Journal of the Atmospheric Sciences;Sep2006, Vol. 63 Issue 9, p2194 

    Part I of this paper presented a detailed analysis of the boundary layer of Hurricane Georges (1998), based mainly on the newly available high-resolution GPS dropsonde data. Here, similar techniques and data are used to study Hurricane Mitch (1998). In contrast to Hurricane Georges, the flow in...

  • Observed Boundary Layer Wind Structure and Balance in the Hurricane Core. Part I: Hurricane Georges. Kepert, Jeffrey D. // Journal of the Atmospheric Sciences;Sep2006, Vol. 63 Issue 9, p2169 

    The GPS dropsonde allows observations at unprecedentedly high horizontal and vertical resolution, and of very high accuracy, within the tropical cyclone boundary layer. These data are used to document the boundary layer wind field of the core of Hurricane Georges (1998) when it was close to its...

  • Assessment of periodic sub-diurnal Earth rotation variations at tidal frequencies through transformation of VLBI normal equation systems. Artz, Thomas; Tesmer née Böckmann, Sarah; Nothnagel, Axel // Journal of Geodesy;Sep2011, Vol. 85 Issue 9, p565 

    We present an empirical model for periodic variations of diurnal and sub-diurnal Earth rotation parameters (ERPs) that was derived based on the transformation of normal equation (NEQ) systems of Very Long Baseline Interferometry (VLBI) observing sessions. NEQ systems that contain highly resolved...

  • Getting "Smart," from Cars to Dams. Brownlee, Ken // Claims;Aug2006, Vol. 54 Issue 8, p66 

    The author reflects on the implications of smart cars, black boxes and dams for the insurance industry. The plan to install black boxes on cars involves linking information to a car's global positioning system to track the location and destination of the car and the driver's behavior. The 2006...

  • An Earthquake Prediction System Using The Time Series Analyses of Earthquake Property And Crust Motion. Takeda, Fumihide; Takeo, Makoto // AIP Conference Proceedings;2004, Vol. 742 Issue 1, p140 

    We have developed a short-term deterministic earthquake (EQ) forecasting system similar to those used for Typhoons and Hurricanes, which has been under a test operation at website http://www.tec21.jp/ since June of 2003. We use the focus and crust displacement data recently opened to the public...

  • Low-Level Kinematic, Thermodynamic, and Reflectivity Fields Associated with Hurricane Bonnie (1998) at Landfall. Schneider, Rebecca; Barnes, Gary M. // Monthly Weather Review;Nov2005, Vol. 133 Issue 11, p3243 

    During 11 h on 26 August 1998, two NOAA WP-3D aircraft deployed 85 Global Positioning System (GPS) dropwindsondes within 2° of latitude of the circulation center of Hurricane Bonnie as it made landfall in North Carolina. About 75% of the sondes successfully collected data, which were used to...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics