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This material is based upon work supported by NSF’s National Ecological Observatory Network which is a major facility fully funded by the National Science Foundation
Christine Laney, Caren Scott, Kaelin Cawley
LTER ASM 2018, Pacific Grove, CA
October 2, 2018
NEON Optimization Examples
1
1: Alkalinity & Acid Neutralizing Capacity (ANC)
• Goal: Reduce budget, without major decrease in quality of our data products
• Alkalinity and Acid Neutralizing Capacity (ANC) are measures of the water’s ability to buffer
systems from changes in pH
▪ ALKALINITY: filtered water
▪ ANC: non-filtered (whole) water
• At each stream site, NEON measures both alkalinity and ANC 26 times per year
▪ 12 monthly
▪ 14 based on hydrology
• If particulates do not add to buffering capacity, ANC will be equal to ALK
• Can we reduce the sampling of ANC?
Contact: Caren Scott (cscott@battelleecology.org)
2
How similar are ALK/ANC? Site ID
Mean Alk
meq/L
Mean
%Diff
ARIK 5.31 3
BIGC 0.60 5
BLDE 0.88 6
BLUE 6.20 3
CARI 0.60 5
COMO 0.19 10
CUPE 2.75 3
GUIL 1.69 5
HOPB 0.12 30
KING 6.24 3
LECO 0.09 14
LEWI 5.43 4
MART 0.30 10
MAYF 0.04 38
MCDI 5.60 5
MCRA 0.21 10
OKSR 0.56 7
POSE 0.86 5
PRIN 4.98 3
REDB 4.62 3
SYCA 5.26 4
WALK 2.05 3
WLOU 1.25 12
3
How similar are ALK/ANC?
• Significant differences at 7 sites
• But the differences are so small,
are they ecologically meaningful differences?
• USGS defines appropriate reproducibility of replicates
▪ good indication of ecologically meaningful differences
• ONLY 1 site had differences greater than USGS threshold
▪ LECO
ALK
meq/L
USGS
cutoff
>4 5%
>0.02 &
<4 10%
<0.02 1 meq/L
Commissioning
Tests
4
Is there a pattern to the differences?
• Even if overall the differences are small, is there a pattern?
• For example: Are differences are always greater in the spring?
▪ If they are, we can keep sampling both ALK and ANC in the spring
• Modelled the differences
▪ Total Suspended Solids—indication of particulates
▪ Specific Conductance—indication of hydrology
▪ Month—indication of hydrology
▪ Year
5
Is there a pattern to the differences?
There are some significant predictors of the difference, mostly by month
6
Recommendations:
• Very little difference between measurements of ALK and ANC
• Even when significant, the magnitude of the difference is smaller than what we
would find appropriate for replicate samples
• Of these small differences, some sites show that the differences are greater in
certain months
• We recommend reducing the ANC sampling
• Keep it at once a month to capture seasonality
• EXCEPT: LECO, significant difference that was greater than replicates should be
7
2. Reaeration Optimization
8
Contact: Kaelin Cawley (kcawley@battelleecology.org)
Question
• Does collecting 6 reaeration experiments per year rather than 10 impact data
quality negatively?
• Physical reaeration is an important
component of enabling metabolism modeling
in aquatic systems
• Parts of an experiment:
1. Discharge measurement
2. Field measurements
3. Conductivity logger measurements
4. Tracer samples
Data Completeness
9
Future Process Quality Checks
▪ Quarterly QAQC checks from HQ and service now ticket(s) and tasks for incomplete experiments
▪ Attempt to reschedule reaeration experiments if one or more components are not completed, e.g.,
HOBO files or discharge data missing or corrupt
▪ Follow-up with the external labs to ensure data is returned in a timely manner
10
Future Data Quality Checks
▪ Develop relationships between physical reaeration
rates and stream discharge where possible using
the existing reaeration R package
▪ Target times of year when discharge is likely to be in
a range that isn’t well covered with existing
reaeration data
k600
versus Q
720.746.4844 | neonscience@battelleecology.org | neonscience.org

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Asm2018 2 neon_laney

  • 1. This material is based upon work supported by NSF’s National Ecological Observatory Network which is a major facility fully funded by the National Science Foundation Christine Laney, Caren Scott, Kaelin Cawley LTER ASM 2018, Pacific Grove, CA October 2, 2018 NEON Optimization Examples 1
  • 2. 1: Alkalinity & Acid Neutralizing Capacity (ANC) • Goal: Reduce budget, without major decrease in quality of our data products • Alkalinity and Acid Neutralizing Capacity (ANC) are measures of the water’s ability to buffer systems from changes in pH ▪ ALKALINITY: filtered water ▪ ANC: non-filtered (whole) water • At each stream site, NEON measures both alkalinity and ANC 26 times per year ▪ 12 monthly ▪ 14 based on hydrology • If particulates do not add to buffering capacity, ANC will be equal to ALK • Can we reduce the sampling of ANC? Contact: Caren Scott (cscott@battelleecology.org) 2
  • 3. How similar are ALK/ANC? Site ID Mean Alk meq/L Mean %Diff ARIK 5.31 3 BIGC 0.60 5 BLDE 0.88 6 BLUE 6.20 3 CARI 0.60 5 COMO 0.19 10 CUPE 2.75 3 GUIL 1.69 5 HOPB 0.12 30 KING 6.24 3 LECO 0.09 14 LEWI 5.43 4 MART 0.30 10 MAYF 0.04 38 MCDI 5.60 5 MCRA 0.21 10 OKSR 0.56 7 POSE 0.86 5 PRIN 4.98 3 REDB 4.62 3 SYCA 5.26 4 WALK 2.05 3 WLOU 1.25 12 3
  • 4. How similar are ALK/ANC? • Significant differences at 7 sites • But the differences are so small, are they ecologically meaningful differences? • USGS defines appropriate reproducibility of replicates ▪ good indication of ecologically meaningful differences • ONLY 1 site had differences greater than USGS threshold ▪ LECO ALK meq/L USGS cutoff >4 5% >0.02 & <4 10% <0.02 1 meq/L Commissioning Tests 4
  • 5. Is there a pattern to the differences? • Even if overall the differences are small, is there a pattern? • For example: Are differences are always greater in the spring? ▪ If they are, we can keep sampling both ALK and ANC in the spring • Modelled the differences ▪ Total Suspended Solids—indication of particulates ▪ Specific Conductance—indication of hydrology ▪ Month—indication of hydrology ▪ Year 5
  • 6. Is there a pattern to the differences? There are some significant predictors of the difference, mostly by month 6
  • 7. Recommendations: • Very little difference between measurements of ALK and ANC • Even when significant, the magnitude of the difference is smaller than what we would find appropriate for replicate samples • Of these small differences, some sites show that the differences are greater in certain months • We recommend reducing the ANC sampling • Keep it at once a month to capture seasonality • EXCEPT: LECO, significant difference that was greater than replicates should be 7
  • 8. 2. Reaeration Optimization 8 Contact: Kaelin Cawley (kcawley@battelleecology.org) Question • Does collecting 6 reaeration experiments per year rather than 10 impact data quality negatively? • Physical reaeration is an important component of enabling metabolism modeling in aquatic systems • Parts of an experiment: 1. Discharge measurement 2. Field measurements 3. Conductivity logger measurements 4. Tracer samples
  • 10. Future Process Quality Checks ▪ Quarterly QAQC checks from HQ and service now ticket(s) and tasks for incomplete experiments ▪ Attempt to reschedule reaeration experiments if one or more components are not completed, e.g., HOBO files or discharge data missing or corrupt ▪ Follow-up with the external labs to ensure data is returned in a timely manner 10 Future Data Quality Checks ▪ Develop relationships between physical reaeration rates and stream discharge where possible using the existing reaeration R package ▪ Target times of year when discharge is likely to be in a range that isn’t well covered with existing reaeration data k600 versus Q