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Lake Taupō long-term monitoring programme 2010-2011

TR 2012/24

Report: TR 2012/24

Author: M Gibbs (NIWA)

Abstract

The monitoring programme has three components: bottom water oxygen depletion, upper water column water quality, and whole water column water quality.

The first profile is taken in spring, when thermal stratification has become established and is stable, the second profile in autumn the following year before thermal stratification begins to break down, as the thermocline deepens.

This report presents data from the routine mid-lake monitoring station from August 2010 to July 2011. Additional information for water clarity, temperature, and chlorophyll a collected between August 2011 and the time of beginning this report has also been included in the data sets in the appendices..

Lake Taupo long-term monitoring programme 2010-2011 [PDF, 1 MB]

Contents
1 Executive summary 5
2 Introduction 9
3 Methods 11
3.1 Report contents 11
3.2 Statistical evaluation 12
3.3 "TREND" definition 12
4 Results and discussion 13
4.1 Temperature and dissolved oxygen 13
4.2 VHOD rate 15
4.3 Secchi depth 18
4.4 Phytoplankton 21
4.5 Deep chlorophyll maxima 23
4.6 Algal species abundance 25
4.7 Nutrients in the upper waters 25
4.8 Nutrient accumulation in the hypolimnion 27
4.9 Total mass accumulated 28
4.10 Net accumulation rate 29
4.11 Total N 31
5 Knowledge gaps 32
6 Summary 33
7 Acknowledgements 37
8 Glossary of abbreviations and terms 39
9 References 41
  Appendix 1 : Site map, sampling strategy and methods 43
  Appendix 2 : The calculation of VHOD rates 49
  Appendix 3 : Temperature and dissolved oxygen data 53
  Appendix 4 : Nutrient data 77
  Appendix 5 : Phytoplankton data 105
  Appendix 6 : Historical data 125