Juliane Schwendike

Juliane Schwendike
University of Leeds · Institute for Climate and Atmospheric Science (ICAS)

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16
Publications
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338
Citations

Publications

Publications (16)
Article
Full-text available
Extreme rainfall in the tropics is frequently linked with coherent synoptic-scale potential vorticity (PV) disturbances. Here, an objective technique is used to identify coherent synoptic-scale cyclonic PV maxima with a focus on those that occur during summer over the African and Australian tropics. These two regions are chosen for comparison becau...
Article
Extreme rainfall in the tropics is frequently linked with coherent synoptic-scale potential vorticity (PV) disturbances. Here, an objective technique is used to identify coherent synoptic-scale cyclonic PV maxima with a focus on those that occur during summer over the African and Australian tropics. These two regions are chosen for comparison becau...
Article
Plausible diagnostics for the top of the tropical cyclone boundary layer include (i) the top of the layer of strong frictional inflow and (ii) the top of the "well-mixed" layer; that is, the layer over which potential temperature $\theta$ is approximately constant. Observations show that these two candidate definitions give markedly different resul...
Article
The linear trend in the local Hadley and Walker circulations from 1979 to 2009 is calculated. These local circulations are defined through a decomposition of the vertical mass flux into its zonal and meridional components. Defining the local circulation this way ensures that the two orthogonal circulations (the local Hadley and Walker circulations)...
Article
The linear trend in the local Hadley and Walker circulations from 1979 to 2009 is calculated. These local circulations are defined through a decomposition of the vertical mass flux into its zonal and meridional components. Defining the local circulation this way ensures that the two orthogonal circulations (the local Hadley and Walker circulations)...
Article
Tropical precipitation is caused by many processes that occur over a wide-range of temporal and spatial scales. Such processes vary from local, diurnal convection driven by a destabilisation of the boundary layer to planetary-scale systems that result in rainfall over many days. It is therefore important to assess whether general circulation models...
Article
Conceptually, it is useful to partition the three-dimensional tropical circulation into meridional and zonal components, namely, the Hadley and Walker circulations. The averaging involved in their definitions can introduce ambiguities. These problems can be circumvented by first partitioning the total vertical mass flux into components associated w...
Chapter
Full-text available
Significant amounts of mineral dust were transported into the vicinity of the developing tropical storm Helene between 9 to 14 September 2006. A number of different dynamical features contributed to the emission and the transport of dust towards Helene. The aim of this study is to investigate the transport of mineral dust towards Hurricane Helene....
Article
Full-text available
North Africa is the largest source of mineral dust, and the dust plumes emanating from this region are the most widespread, persistent and dense. The dust is emitted from the desert regions and transported into the atmosphere. These processes are highly variable in time and space with an annual peak during summer. The uplifted dry and mineral dust...
Article
Within the framework of the AMMA project, atmospheric, surface and soil observations were performed during the pre-onset phase of the monsoon (Special Observing Period SOP 1) and during the summer monsoon (SOP 2) in 2006. Based on several case-studies the paper investigates the impact of mesoscale convective systems (MCSs) on the surface and bounda...
Chapter
The dramatic change in the region of the West African Monsoon (WAM) from wet conditions in the 50s and 60s to much drier conditions from the 70s to the 90s represents one of the strongest inter–decadal signals on the planet in the 20th century. Marked inter-annual variations in the recent decades have resulted in extremely dry years with devastatin...
Article
Convective systems embedded in an African Easterly Wave (AEW) over West Africa and the eastern Atlantic in September 2006 are investigated. The study is based on COSMO model runs with a horizontal resolution of 2.8 km. The developing, mature and decaying phases of a mesoscale convective system over land are identified. Over the ocean, the convectio...
Article
Full-text available
This paper describes the boundary layer wind structure and dynamics of Hurricanes Danielle (1998) and Isabel (2003), based on the analysis of high-resolution global positioning system dropwindsonde data and simulation of the flow by a three-dimensional boundary layer model produced by Kepert and Wang. The observations show that the hurricane bounda...
Article
Convective systems over West Africa and the eastern Atlantic embedded in the African Easterly wave out of which Hurricane Helene (2006) developed are investigated by means of potential temperature and relative vorticity budgets. The tropical cyclogenesis of Helene was accompanied by several mineral dust outbreaks. The influence of the dust-radiatio...

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Project (1)
Project
Systematic analysis of the performance of convective-scale ensemble forecasts of high-impact weather events across Southeast Asia