Atmospheric analysis

Station height is in metres above mean sea level. Years of data are the number of complete years of data for the 1981 – 2010 period.

Technical information about our datasets and methodology along with related resources.

Once eels become migrants (also known as tuna heke or tuna whakaheke) they stop feeding, and progressively develop the external features that clearly distinguish them from 'feeders'.

This is a sub-tropical climate zone, with warm humid summers and mild winters.

Projections of how climate change is likely to affect New Zealand.

One of the major consequences of climate change is rising global sea levels.

The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere.

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

Dry stock farms can cover large areas of hill-country grassland that may be steep and prone to erosion.

Identifying biological factors that may be limiting fish numbers requires sampling to ensure that key invertebrate prey species are not scarce and that pest fish, especially predators, are not abundant.