The largest rivers on Earth are not on the ground, but in the sky. Our new study, published in Environmental Research Letters, showed that nine out of ten of the most expensive floods in New Zealand (2007-2017) occurred during an Atmospheric River event, and seven to all ten of the top ten most extreme rainfall events at eleven different locations occurred during Atmospheric Rivers.
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Storms cause ripples in the wind that travel upwards and away from the clouds, much like a stone causes ripples when it is thrown in a pond. These can then affect the temperature and winds around the storms and make them grow, last longer, or die earlier.
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The researchers analysed the performance of the ACCESSS1 seasonal forecast model to predict the SPCZ position and rainfall over the period 1990-2012. ACCESSS1 performed better in simulating the SPCZ than the previous model, POAMA.
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CLEX researchers have developed a new global land-based daily precipitation dataset called Rainfall Estimates on a Gridded Network – REGEN – aimed at facilitating studies to understand changes and variability in several aspects of daily precipitation distributions, extremes and measures of hydrological intensity.
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Lee Constable interviews Prof Christian Jakob about what we don’t know about climate change for her channel on the Cimpatico Studios platform, Climate Australia.
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New study shows November-to-March precipitation (when rainy season peaks over most of the Southern Hemisphere land mass) was significantly reduced both in the Southern Hemisphere tropics and subtropics due to a weakening of the subtropical convergence zones during the mid-Pliocene Warm Period.
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An international team including CLEX researchers examined models used by the Intergovernmental Panel for Climate Change (IPCC) over three model phases linked to IPCC reports – CMIP3, CMIP5, and the most recent, CMIP6, to see if they improved representation of tropical rainfall.
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CLEX researchers explore the challenges of identifying atmospheric rivers and find that detecting these events is highly variable according to resolution, and choice of the integrated water vapour transport thresholds. The uncertainties in a single detection method and data parameters may be as large as uncertainties across AR detection methodologies.
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CLEX researchers find rapidly intensifying hurricanes may become more frequent in a future warmer climate and the speed of this increase in intensity will continue to accelerate as the world’s oceans continue to warm.
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Australia researchers are calling on storm chasers and members of the general public fascinated by severe weather to take part in a citizen science project that will help better capture the occurrence of extreme weather events and improve our ability to forecast them.
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Research brief: New Zealand’s costliest floods caused by atmospheric rivers
Research brief: New reporting format for leaf-level gas exchange data
Research brief: The Black Summer and COVID impacts on Sydney and Melbourne air quality.
Research brief: Most Australian heatwaves from moving systems, not blocked systems
