Stratospheric chemistry in the NZESM
Improving the simulation of stratospheric chemistry in the NZESM
The aim of this project is mainly to improve the simulation of stratospheric chemistry in the NZ Earth Systems Model (NZESM). Stratospheric ozone is particularly relevant to climate change in the southern hemisphere because of the emergence, in every spring, of the ozone hole above Antarctica.
Ozone depletion is a major (and, seasonally, the dominant) driver of southern hemisphere climate change. However, problems with simulating ozone means it’s difficult to have confidence that the extent of its influence is properly represented in the model. This work improves the simulation of stratospheric ozone depletion, and in particular Antarctic ozone depletion, to contribute to a more realistic simulation of southern hemisphere climate and its response to human activity.
This project builds on a strong heritage in stratospheric model development in New Zealand and complements the work of our international partners in earth system modelling. We’re collaborating closely with another Deep South Challenge project (Evaluating the NZESM against modern & historical observations) that will produce observational datasets to help us validate the NZESM. We’re also strengthening a long-standing relationship with Australian colleagues interested in climate–ozone links.
Project contact: Olaf Morgenstern, NIWA
Project budget: $300,000
Project duration: October 2016 – June 2018
Research and findings:
Tropical circulation and precipitation response to ozone depletion and recovery, Stefan Brönnimann et al, Environmental Research Letters
The evolution of zonally asymmetric austral ozone in a chemistry–climate model, Fraser Dennison et al, Atmospheric Chemistry and Physics
Stratospheric Chemistry in the NZESM, Fraser Dennison et al, Deep South Symposium
Return to the Earth System Modelling and Prediction programme page
Check out the full list of Deep South Challenge projects
Latest news and updates
2018 may well be the year New Zealand gets serious about adapting to our changing climate. Last year, and the start of this one, gave all of us plenty of opportunities to experience a future in which creeping sea level rise and extreme weather – from drought to flood to surprise storm surges – make day-to-day life more precarious and more expensive.
In October 2017, the Deep South Challenge released a report into the state of the nation’s storm and waste water infrastructure, in the face of a changing climate. The report garnered significant media attention – not surprising given the infrastructure is currently valued at well over $20 billion.
The Deep South Challenge awards funding to investigate climate-resilient, high-value crops for the whānau of Omaio
The whānau of Omaio in the Bay of Plenty have joined forces with NIWA researchers to explore the viability of climate-resilient, high-value crops for the rohe. The group has won a $250,000 research grant under the Vision Mātauranga programme of the Deep South National Science Challenge to better understand Omaio’s changing climate and how it might support the community to create a local economy based around a high-value product like kiwi fruit.