Atmospheric analysis

Once in freshwater, glass eels develop into darker pigmented juvenile eels known as elvers.

A carbon neutral activity is one that has a carbon footprint of zero.

The UV Index is a measure of the intensity of UV radiation. The larger the number, the more intense the UV. In New Zealand, its maximum summer value is generally about 12, but it can exceed 13 in the far North. In winter it reaches peak values of 1 or 2. Values of 10 or more should be considered as "extreme". At high altitude tropical sites (eg Mauna Loa Observatory, Hawaii), the UV Index can exceed 20.The UV Index supersedes the idea of "Time to Burn" or "Burn Time", which has been used previously in New Zealand.

View a collection of maps showing the impact of past El Niño and La Niña events.

A monthly summary of the climate in the tropical South Pacific islands, with an outlook for the coming months.

The New Zealand Palaeotsunami Database (Database) brings together all known information about tsunamis that occurred prior to written records.

Useful information and resources on New Zealand's marine flora and invertebrate fauna.

Mining is the extraction of metal and mineral resources, such as gold, coal, petroleum, and ironsand

Tsunami is a Japanese word meaning great wave in harbour.

NIWA's mission is to conduct leading environmental science to enable the sustainable management of natural resources for New Zealand and the planet.