Identification of Weekly Cycles in Global Fires and Urban Temperatures

Seminar/Forum

Identification of Weekly Cycles in Global Fires and Urban Temperatures

Theatre 2, Basement Level
207 Bouverie Street

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T: 8344 9395

jmcook@unimelb.edu.au

It is widely accepted that human impact on the atmosphere and oceans is unequivocal. It is therefore essential to quantify this influence and identify the associated mechanisms, a difficult task considering the complexity of the climate system.

One approach is based onweekly cycles (WCs). With no published literature highlighting evidence of natural processes occurring on a WC, any signal in meteorological parameters varying on such a timescale can be considered as anthropogenic.

WCs provide an interesting insight into the role that human activities (e.g. industrial activity and commuting), commonly changed at weekends, have on the atmosphere at a range of scales.

Firstly, this presentation investigates the WC of active fires at a number of spatial scales, ranging from the global domain, to regions of interest within continents and individual countries. We then examine the WCs of surface temperature in major Australian cities and how these cycles vary at different times of day. Finally, we quantify the extent of the Melbourne urban heat island and examine whether there is a WC present. A new Monte Carlo approach to quantify the robustness of the long-term WC signals is introduced.

This seminar is based on a paper co-written with Ian Simmonds and Nigel Tapper.

Presenter

  • Dr Nick Earl
    Dr Nick Earl, Research Associate