Basic detection and categorisation of events

Robert Schlegel

Sorbonne Université

2023-07-24



Know the rules well, so you can break them effectively.
–Dalai Lama



Learn the rules like a pro, so you can break them like an artist.
–Pablo Picasso


We are interested in the why more than the how.


However, to evolve the why we need a deep understanding of the how.


But beware, if we focus on the how, we may get stuck in dogmatic thinking and forget the why.

How:

Statistical decomposition of temperature time series


Why:

Reference point around which to investigate:
  • physical forces of extreme temperature
  • bio/ecological impacts of extreme temperature
  • socio/economic impacts of extreme temperature

How - definition


Oliver; MHW International Working group

How - categories


Hobday et al. (2018) Categorizing and Naming Marine Heatwaves

Detecting extreme events

  1. Pick a time series
  2. Set the baseline period
  3. Chose a threshold value
  4. Detect consecutive days
  5. Calculate metrics

MHW demo


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Language of choice

Downloading data

Why