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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    Ways to improve stream water quality

  • Scientists explore deepest parts of the Kermadec Trench

    Media release
    Scientists exploring the Kermadec Trench believe they have retrieved the deepest ever sediment sample from the bottom of the ocean using a wire-deployed corer.
  • Altered water flow (hydrology)

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

    UVI smartphone apps

    Several apps that provide forecasts of the UV index (UVI) are available for smartphones. 
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    Mean number of days of ground frost

    These datasets are available in a range of formats.
  • UV index signage at Lauder

    UV Index Information

    Education Resource
    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.
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    Suspended-sediment yield estimator

    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.
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    What ails our estuaries - problems and solutions

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

    There are two species of kōura or freshwater crayfish in Aotearoa.
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    Infectious substances

    Waterways can easily become contaminated by pathogens when effluent is discharged nearby.
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    Statement of Core Purpose

    The Statement of Core Purpose spells out why the Government owns Crown Research Institutes and what it expects from them.
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    Map N South

    Education Resource
    As much of this climate zone is sheltered by high country to the west, south and in some areas to the east, it is the sunniest region of New Zealand.