The world’s oceans are acidifying as a result of the carbon dioxide (CO2) generated by humanity.

Learn about different kinds of beachs and how they form, with diagrams and examples of each type.

Each waterway has its own particular characteristics relating to water flow, velocity, and quantity.

Some commonly-asked questions about tornadoes in New Zealand.

These datasets are available in a range of formats.

View data that show reported target catch and estimated bycatch.

The UV Index is a measure of the intensity of UV radiation. The UV Index supersedes the idea of "Time to Burn" or "Burn Time", which has been used previously in New Zealand.

Rig shark is an important inshore commercial fish species in New Zealand, and we need to understand more about their habitats, movements, nursery grounds and vulnerability to human impacts to ensure they are managed sustainably and their productivity is enhanced.

This national GIS ‘layer’ enables reconnaissance-scale estimation of suspended-sediment yields from New Zealand’s rivers and streams. It has been developed by NIWA in collaboration with Landcare Research.

Greenhouse gases are atmospheric gases that intercept long-wave (mainly infrared) radiation emitted from the Earth's surface.

Estuaries are at the bottom of the freshwater drainage network and, effectively, are a part of it.