26 Apr 2023

Our Changing World – Cyclones and phytoplankton blooms

From Afternoons, 3:35 pm on 26 April 2023

We know – all too well now – that tropical cyclones can cause huge amounts of destruction in the South Pacific. 

But might they also be a source of marine life?  

Cyclone Oma at midday on February 20, 2019

Cyclone Oma at midday on February 20, 2019 Photo: earth.nullschool.net/

That’s the question Dr Pete Russell of the University of Otago is trying to answer.

Pete has been tracking tropical cyclones in the Pacific, looking for a particular kind – those that result in phytoplankton blooms. 

A man standing in front of a watery background. He is wearing glasses and smiling.

Dr Pete Russell. Photo: Claire Concannon / RNZ

By looking at storm track data that shows the path of tropical cyclones, Pete can predict whether they will result in a phytoplankton bloom.

Satellite images of ocean colour, tuned to the chlorophyll A in phytoplankton, then give confirmation.

Learn about how blooming cyclones can help predict tropical cyclones in a warmer South Pacific Ocean (and the particularly large bloom event of 2019) in the episode below.

  • Read the research paper discussed in this episode here.

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