Atmospheric analysis

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

  • (no image provided)

    Cosine response at 300 nm

    DCE,Q?
  • (no image provided)

    Eqns

    Mass of Seawater = w(sw) [kg]
    Volume of Manometer = Vman [cm3]
    Manometer Temperature = T [°C]
    Manometer Pressure = Pfinal [Pa]
    Pressure transducer zero = Po [Pa]
    Universal Gas Constant = R = 8.314 J K-1 mol-1
    Virial Co-efficient B(CO2) [cm3 mol-1] B = 1636.75+(12.0408*(T+273.16))-(0.0327957*(T+273.16)2)+(0.0000316528*(T+273.16)3)
    Vm(CO2 at manometer T and P) [m3] – calculate iteratively, initial Vm = 0.22264 =R*(T+273.16)/((Pfinal - Po))*(1+(B*0.000001/Vm))
    CT
  • (no image provided)

    Flow Cytometer

    NIWA's Becton Dickinson FACSCalibur flow cytometer supports a wide range of research and commercial applications.
  • (no image provided)

    Alice: an Instrumented Tripod

    Alice is an instrument package for measuring bottom-boundary-layer processes in estuaries and the ocean. It consists of a self-ballasted tripod upon which is mounted a "core" sensor package for measuring boundary-layer currents, turbulence and waves. Alice is principally rigged for sediment-transport studies (with optical and acoustic backscatter sensors, sediment traps and a pump sampler) but has also been used extensively in studies of boundary-layer mechanics, animal–flow–sediment interactions, wave dynamics and nutrient/gas fluxes.
  • (no image provided)

    Benthic Ecology Video Information System

    BEVIS has been developed for rapid, cost-effective seafloor habitat surveys. Sled-borne cameras are monitored and controlled from the surface, affording investigation at depths where using divers to collect video data or macrobenthic cores would be impractical or impossible. 
  • (no image provided)

    Computerised Research Echo Sounder Technology (CREST)

    Our Computerised Research Echo Sounder Technology (CREST) is a highly adaptable approach to fisheries and other acoustic data acquisition.
  • (no image provided)

    Estuaries publications

    Where an online version is not available, a PDF is provided. Use your browser’s Back button to return to this page.
    Bell, R.; Green, M.; Hume, T.; Gorman, R. (2000). What regulates sedimentation in estuaries? Water & Atmosphere 8(4): 13–16.
    Davies-Colley, R.; Nagels, J.; Donnison, A.; Muirhead, R. (2004). Flood flushing of bugs in agricultural streams. Water & Atmosphere 12(2): 18–20.
    Green, M. (2003.) The dance of the turbid fringe. Water & Atmosphere 11(2): 20–21.
    Green, M.; Ellis, J.; Schwarz, A.-M.; Lind, D.; Bluck, B. (2003).
  • (no image provided)

    Resource Management Act

    The Resource Management Act 1991 (RMA) dictates how we are to manage our physical environment, including the coast and estuaries.
  • (no image provided)

    Models

    A model is a representation of a “real thing”. Usually, the model is simpler in some or many ways than the real thing; the model simulates the behaviour of the real thing; and the model can be used to predict the future behaviour of the real thing.
  • (no image provided)

    Monitoring

    Monitoring is often an expensive exercise, but it does not have to be.
  • (no image provided)

    What now?

    Estuaries are more than just the mudflats that we cross on the way to the beach. Of course they have intrinsic value – what natural environment doesn’t? – but they also provide us humans with a range of ecological services that help to sustain the quality of our environment, and with amenities that we all enjoy, and sometimes profit from.
  • NZ estuaries

    Over the past decade, NIWA has published many popular articles that deal with estuaries - this overview is intended to bring together and make whole sense of the information published to date in the various popular articles.