Accounting for changes in method in long-term nutrient data : recommendations based on analysis of paired SoE data from Wellington rivers / prepared for the Ministry for the Environment by Rob Davies-Colley, Graham McBride.

By: Davies-Colley, Rob [author. ].
Contributor(s): McBride, Graham [author.] | New Zealand. Ministry for the Environment [issuing body.] | National Institute of Water and Atmospheric Research (N.Z.).
Material type: materialTypeLabelBookSeries: NIWA client report: HAM2016-070Publisher: [Wellington, N.Z. : Ministry for the Environment, 2017]Description: 1 online resource.Subject(s): WATER QUALITY | WELLINGTON REGION | NEW ZEALAND | RIVERS | NUTRIENTS | NITROGEN | PROTOCOLS | WATER QUALITY MANAGEMENT | WATER SAMPLES | WATER ANALYSISHoldings: ELECTRONIC Online resources: HAM2016-070 Ministry for the Environment website | Accounting for changes in method in long-term nutrient data : recommendations based on analysis of paired SoE data from Wellington rivers. NIWA document server
Contents:
Executive summary -- 1 Introduction -- 1.1 Estimation of total nitrogen -- 1.2 Field versus laboratory filtration for dissolved nutrients -- 1.3 Screen vs trace level measurement of dissolved nutrients -- 2 US Geological Survey studies of total nitrogen estimation -- 3 Methods -- 3.1 Paired nutrient data in Wellington river SoE datasets -- 3.2 Data comparisons -- 4 Results and discussion -- 4.1 Estimation of total nitrogen -- 4.2 Field versus laboratory filtration -- 4.3 Trace versus screen analysis of dissolved nutrients -- 5 Changing measurement protocols -- 5.1 Why is such duplicate sampling necessary? -- 5.2 Ramifications of changed protocols and bias -- 6 Recommendations -- 6.1 General -- 6.2 Total nitrogen -- 6.3 Dissolved nutrients -- 7 Acknowledgements -- 8 Glossary of abbreviations and terms -- 9 References
Summary: The Ministry for the Environment has commissioned the National Institute of Water and Atmospheric Research to compare nutrient measurements in Wellington rivers by national recommended protocols versus Greater Wellington Regional Council’s historical protocols. The purpose of this work was to look at the impact on regional councils’ long term nutrient measurements if monitoring protocols were changed, using Greater Wellington Regional Council as a case study.
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"June 2016"

Publication date: October 2017

Publication reference number: CR 288

NIWA Client Report No: HAM2016-070. Report date: June 2016.
NIWA Project: MFE16206

Executive summary -- 1 Introduction -- 1.1 Estimation of total nitrogen -- 1.2 Field versus laboratory filtration for dissolved nutrients -- 1.3 Screen vs trace level measurement of dissolved nutrients -- 2 US Geological Survey studies of total nitrogen estimation -- 3 Methods -- 3.1 Paired nutrient data in Wellington river SoE datasets -- 3.2 Data comparisons -- 4 Results and discussion -- 4.1 Estimation of total nitrogen -- 4.2 Field versus laboratory filtration -- 4.3 Trace versus screen analysis of dissolved nutrients -- 5 Changing measurement protocols -- 5.1 Why is such duplicate sampling necessary? -- 5.2 Ramifications of changed protocols and bias -- 6 Recommendations -- 6.1 General -- 6.2 Total nitrogen -- 6.3 Dissolved nutrients -- 7 Acknowledgements -- 8 Glossary of abbreviations and terms -- 9 References

The Ministry for the Environment has commissioned the National Institute of Water and Atmospheric Research to compare nutrient measurements in Wellington rivers by national recommended protocols versus Greater Wellington Regional Council’s historical protocols.
The purpose of this work was to look at the impact on regional councils’ long term nutrient measurements if monitoring protocols were changed, using Greater Wellington Regional Council as a case study.

ELECTRONIC

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