2010
DOI: 10.5194/acp-10-3163-2010
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A new paradigm for intensity modification of tropical cyclones: thermodynamic impact of vertical wind shear on the inflow layer

Abstract: Abstract. An important roadblock to improved intensity forecasts for tropical cyclones (TCs) is our incomplete understanding of the interaction of a TC with the environmental flow. In this paper we re-visit the canonical problem of a TC in vertical wind shear on an f-plane. A suite of numerical experiments is performed with intense TCs in moderate to strong vertical shear. We employ a set of simplified model physics -a simple bulk aerodynamic boundary layer scheme and "warm rain" microphysics -to foster better… Show more

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Cited by 239 publications
(205 citation statements)
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References 52 publications
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“…11c), suggesting an amplified negative impact of dry air intrusion there. Although it remains unclear precisely how the drier air enters the eyewall updrafts and limits the strengthening of storms due to the coarser resolution of the GFS data we used, the apparent difference of DFX between the two groups demonstrates clear links between the environmental moisture content and TC intensity, which complements recent idealized studies of Riemer et al (2010Riemer et al ( , 2013.…”
Section: Subsets Of Composites With Similar Geographic Locationssupporting
confidence: 58%
See 2 more Smart Citations
“…11c), suggesting an amplified negative impact of dry air intrusion there. Although it remains unclear precisely how the drier air enters the eyewall updrafts and limits the strengthening of storms due to the coarser resolution of the GFS data we used, the apparent difference of DFX between the two groups demonstrates clear links between the environmental moisture content and TC intensity, which complements recent idealized studies of Riemer et al (2010Riemer et al ( , 2013.…”
Section: Subsets Of Composites With Similar Geographic Locationssupporting
confidence: 58%
“…An alternative manifestation of the ventilation effect is the outward eddy flux of warm core air by the shear-induced asymmetric flow in the upper levels, causing a decrease of the warm core from top to bottom and thus weakening the TC (Frank and Ritchie, 2001). An alternative hypothesis was recently presented in Riemer et al (2010Riemer et al ( , 2013: the cooler and drier (lower θ e) air could be brought into the boundary layer from above by shear-induced downdrafts flux, which significantly reduces eyewall θe values and subsequently constrains the storm intensity when the lower θe air enters the eyewall updrafts. Riemer and Montgomery (2011) further argued that the environmental vertical wind shear might promote or impede the interaction with the environmental air depending on the direction of the shear vector.…”
Section: Shoujuan Shu Et Al: Environmental Influences On the Intensimentioning
confidence: 99%
See 1 more Smart Citation
“…To date, the physical processes that govern this intensity evolution are not well understood. In a recent publication (Riemer et al, 2010, referred to as RMN10 hereafter) a new framework for the intensity modification of TCs in vertical wind shear was proposed. While previous hypotheses have focused almost exclusively on processes above the boundary layer, RMN10 showed that vertical wind shear has a significant impact on the thermodynamic properties of the TC's inflow layer 1 .…”
Section: A New Framework For Intensity Modification Of Tropical Cyclomentioning
confidence: 99%
“…Shear has been shown to have a negative influence on the TC-intensity change (e.g., DeMaria et al 2005) through several proposed mechanisms. One hypothesized mechanism is the thermodynamic modification of the inflow layer by downdrafts induced by asymmetric convection outside the inner core (Riemer et al 2010(Riemer et al , 2013. To assess this, the position of each dropsonde was rotated with respect to the environmental vertical wind shear following Corbosiero and Molinari (2002).…”
Section: Scientific Highlightsmentioning
confidence: 99%