Research

There is a marked seasonal cycle in surface ozone (O3), with a maximum in winter and minimum in summer. There can also be significant variability from day to day caused by synoptic scale meteorological variations.

NIWA has a number of projects that are allowing us to better understand the interaction between snapper and their environment over their life cycle.

The Southern Ocean has a strong influence on New Zealand and global climate. To understand how the oceans have changed over 1000s of years we use sediment archives from the seafloor.

The ability to properly manage our freshwater resources requires a solid understanding of the flora and fauna which live in and interact with them.

An experiment in Henderson Creek, Auckland, has demonstrated how tidal creeks variously import, export and deposit sediment, depending on the wind and freshwater runoff, and modulated by the tide.

Mangrove forests, which are important parts of estuarine ecosystems in a number of ways, are sensitive to changing sea level.

Aquatic systems are under threat due to the introduction of invasive exotic species such as water weeds. Modelling work by NIWA has provided new information on which water bodies may be at greatest risk.

NIWA has developed a rapid, desktop model which assesses the potential impact of introducing new fish species to New Zealand. The model is customised to New Zealand's unique environment and endemic fish.

The seaweed known colloquially as nori in Japanese - used for making sushi - or karengo in Maori has been reclassified by an international team of scientists including NIWA's Dr Wendy Nelson.

New Zealand's geographic isolation and relatively recent colonization provide the opportunity for a unique genetic analysis of plant movement patterns to be explored.

Estuaries in New Zealand are experiencing sedimentation at higher rates than before humans arrived here: this represents a loss both for land and estuary productivity. We need to better understand what has been happening so that we can predict the future and fight these losses.

A significant threat to the biosecurity of New Zealand's freshwater habitats comes from plants that have been intentionally introduced.