In this paper, the authors investigated the composite extratropical flow response to recurving western North Pacific tropical cyclones (WNP TCs), and the dependence of this response on the strength of the TC-extrropical interaction as defined by the negative potential vorticity advection (PV) by the irrotational wind associated with the TC.
Abstract:
This study investigates the composite extratropical flow response to recurving western North Pacific tropical cyclones (WNP TCs), and the dependence of this response on the strength of the TC–extratropical flow interaction as defined by the negative potential vorticity advection (PV) by the irrotational wind associated with the TC. The 2.5° NCEP–NCAR reanalysis is used to construct composite analyses of all 1979–2009 recurving WNP TCs and of subsets that undergo strong and weak TC–extratropical flow interactions.Findings indicate that recurving WNP TCs are associated with the amplification of a preexisting Rossby wave train (RWT) that disperses downstream and modifies the large-scale flow pattern over North America. This RWT affects approximately 240° of longitude and persists for approximately 10 days. Recurving TCs associated with strong TC–extratropical flow interactions are associated with a stronger extratropical flow response than those associated with weak TC–extratropical flow interactions...
TL;DR: In this paper, a review of the literature on upper-tropospheric transient wave packets along the midlatitude jet stream is presented, with an emphasis on developments during the last 15 years.
TL;DR: In this paper, the authors simulated the impact of the strength of the midlatitude circulation trough without changing its phasing with the tropical cyclone and found that the peak intensity of the extratropical cyclone following the extarropical transition is strongly dependent on the phasing, which leads to different degrees of interaction with the mid-latitude baroclinic zone.
TL;DR: In this article, the role of diabatic outflow in midlatitude flow amplification was highlighted in the context of a review of the physical and dynamical processes involved in extratropical transition.
TL;DR: The extratropical transition (ET) of tropical cyclones often has an important impact on the nature and predictability of the midlatitude flow of the tropical cyclone as discussed by the authors.
TL;DR: In this paper, a vorticity equation model is used to diagnose the relationship between tropical convective heating and the upper tropospheric rotational wind field, and it is shown that the Rossby wave source can be very different from the simple −fD source often used.
TL;DR: In this article, the challenges associated with forecasting extratropical transition are described in terms of the forecast variables (track, intensity, surface winds, precipitation) and their impacts (flooding, bush fires, ocean response).
TL;DR: Extratropical transition in the western North Pacific is defined here in terms of two stages: transformation, in which the tropical cyclone evolves into a baroclinic storm; and reintensification, where the transformed storm then deepens as an extrropical cyclone.
TL;DR: In this article, potential vorticity (PVV) and quasigeostrophic perspectives are utilized to better understand and quantify the relevant dynamics during the interaction of a tropical cyclone with a midlatitude trough.
TL;DR: In this article, the authors highlight the importance of diabatic processes for the complex interaction of weather systems in the North Atlantic-European sector during the week of 7-14 September 2008.
Q1. What are the contributions mentioned in the paper "A composite perspective of the extratropical flow response to recurving western north pacific tropical cyclones" ?
This study investigates the composite extratropical flow response to recurving western North Pacific tropical cyclones ( WNP TCs ), and the dependence of this response on the strength of the TC–extratropical flow interaction as defined by the negative potential vorticity advection ( PV ) by the irrotational wind associated with the TC.
Q2. What are the future works mentioned in the paper "A composite perspective of the extratropical flow response to recurving western north pacific tropical cyclones" ?
The findings of this study suggest a variety of avenues for future research. For example, the onset of a trough over centralNorthAmerica following WNP TC recurvature indicated by the composite analysis of all recurving WNP TCs suggests a possible connection between recurving TCs and outbreaks of severe convection over the U. S. central plains. Although this study did not directly address predictability, it provides a potential framework in which to evaluate numerical model forecast error and uncertainty associated with the TC–extratropical flow interaction for recurving TC cases and other weather phenomena associated with divergent outflow that may impinge strongly upon the PV waveguide [ e. Many studies suggest that large numerical model forecast errors may result from a failure of the numerical model to adequately capture diabatically driven ridge amplification ( e. g., Davies and Didone 2013 ; Gray et al. 2014 ), whether associated with recurving TCs ( e. g., Henderson et al. 1999 ; Torn 2010 ), mesoscale convective systems ( e. g., Dickinson et al. 1997 ; Rodwell et al. 2013 ), or warm conveyor belts of explosively deepening extratropical cyclones ( e. g., Doyle et al. 2014 ).