On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Atmospheric analysis

NIWA has been using advanced scientific instruments to measure atmospheric trace gases and isotopes for over 50 years.

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    Tuna - age and methods of ageing

    Currently, the most reliable method to estimate the age of tuna is by examination of their otoliths or "ear bones"
  • Kaitiaki Tools

    Service
    Easing the resource consent process
  • Mahinga kai - what species interests you?

    In Kaitiaki Tools the term mahinga kai generally refers to indigenous freshwater species that have traditionally been used as food, tools, or other resources.
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    Meteorologist for a day

    Within a range of meaningful contexts students will be able to make statements about implications and possible actions consistent with the results of a statistical investigation and to find and authenticate data measures such as mean, median, mode, inter-quartile range, and range.
  • Questions and answers about oyster disease Bonamia ostreae

    Media release
    NIWA is today issuing some scientific information on the parasite Bonamia ostreae, recently discovered in Big Glory Bay, Stewart Island, and the risk it poses to the Bluff oyster fishery.
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    Standardised Precipitation Index (SPI)

    The Standardised Precipitation Index (SPI) is a simple measure of drought (and also of very wet conditions) and is based solely on the accumulated precipitation for a given time period.
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    Further reading

    References, further reading, and links to useful websites.
  • Sediment

    When soils erode, sediments are washed into waterways.
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    Map W South

    Education Resource
    The climate of this area is greatly dependent on its exposure to weather systems from the Tasman Sea and the lie of the Southern Alps to the east.
  • Submerged plants as bio-indicators

    Submerged plants have a number of advantages that favour their use as indicators of lake ecological condition.
  • Regional climatologies

    A regional climatology is a summary of the typical weather and climate of a region, based on historical data observations made at climate stations located within the region.