Long Term-Ecological Research (LTER) Network All Scientists' MeetingSeptember 30 - October 4, 2018, Asilomar Conference Grounds, CA
Workshop: Best monitoring through uncertainty analysis: Optimize allocation of effort, save time and moneyOctober 3, 2018
Periodic evaluation of monitoring programs is important to accommodate changing objectives, technological advances, and the accumulation of information over time. Uncertainty analysis can provide a basis for making difficult decisions about reducing or redirecting sampling effort, as will be illustrated in case studies involving mercury contamination in fish and loons, measurement uncertainty in forest inventory (FIA), and the number and placement of precipitation gauges at Hubbard Brook. Please come to learn about and discuss what analyses to use in which circumstances and how they might be applied at your site.
American Geophysical Union (AGU) Fall Meeting
December 12-16, 2016, San Francisco, CA
The QUEST Session at American Geophysical Unionmerged with three other proposed sessions to get a full day of talks, Monday December 12, in Moscone West 2004. Quantifying Uncertainties and Merging Observations, Experiments, and Models for Improving Estimation, Mapping, and Forecasting of Terrestrial Ecosystem Dynamics I and II. Session: B11J and B12C
Why Quantify Uncertainty in Ecosystem Studies: Obligation versus Discovery Tool? Mark E. Harmon
High-Resolution Precipitation Mapping in a Mountainous Watershed: Ground Truth for Evaluating Uncertainty in a National Precipitation Dataset. Christopher Daly, Melissa E. Slater, Joshua A Roberti, Stephanie H. Laseter and Lloyd W. Swift
What if the Hubbard Brook weirs had been built somewhere else? Spatial uncertainty in the application of catchment budgets. Scott W Bailey
From Small Forest Inventory Plots to Regional Biomass Estimates: Dealing with Uncertainty from Inventory Sampling by Focusing on Trees Instead of Biomass.Bradley Tomasek, Erin M Schliep, Alan E. Gelfand and James S Clark
The following presentations are posters:
Benchmarking Terrestrial Ecosystem Models in the South Central US. Manoj Kc, Kim Winton, Michael A Langston and Yiqi Luo
How to Avoid Errors in Error Propagation: Prediction Intervals and Confidence Intervals in Forest Biomass. Paul Lilly, Ruth D. Yanai, Hannah L Buckley, Bradley S Case, Richard C Woollons, Robert J Holdaway and James Johnson
Quantifying uncertainty in carbon and nutrient pools of coarse woody debris. Craig Robert See, John L Campbell, Shawn Fraver, Grant M Domke, Mark E. Harmon, Jennifer D Knoepp, and Christopher W Woodall
Uncertainty Propagation in Predictions of Hydraulic Parameters Based on the Pedotransfer Functions. Boris Faybishenko, Tetsu K Tokunaga, Yongman Kim and Deb Agarwal
Uncertainty in a certain world: standardized approach to evaluating uncertainty in measurement results. Janae Lynn Csavina and Joshua A Roberti
Sources of variability in tissue chemistry in northern hardwood species. Yang Yang, Ruth D. Yanai, Farrah Roxanne Fatemi, Carrie R Levine, Paul Lilly and Russell Briggs
Interannual variability, correlated errors, and trend detection of evapotranspiration at AmeriFlux sites. Angela Jean Rigden and Guido Salvucci
‘spup’ – An R Package for Analysis of Spatial Uncertainty Propagation and Application to Trace Gas Emission Simulations. Kasia Sawicka, Lutz Breuer, Tobias Houska, Ignacio Santabarbara Ruiz and Gerard B.M. Heuvelink
Evaluating Random Error of Long-term, Multi-plot Flux Gradient Measurements of Agricultural Greenhouse Gas Emissions. Shannon E Brown, Claudia Wagner-Riddle and Muhammad Firdaus Sulaimana
Uncertainties in detecting decadal change in extractable soil elements in Northern Forests. Olivia Bartlett, Scott W Bailey, and Mark J Ducey
A geospatial framework for improving the vertical accuracy of elevation models in Florida’s coastal Everglades. Hannah Cooper, Caiyun Zhang and Matthew Sirianni
Quantifying the impact of the longitudinal dispersion coefficient parameter uncertainty on the physical transport processes in rivers. Vivian Veronica Camacho Suarez, James Shucksmith and Alma Schellart
Forested hillslope water budget uncertainty: understanding the pathway from precipitation to biota to stream discharge. Heather Nicole Speckman, Daniel Beverly, Jason Mercer, Suman Chitrakar, Drew Thayer, Bradley Carr, Andrew Parsekian and Brent E Ewers
Soil Science Society of America Meeting
November 8, 2016, Phoenix, AZ
Quantifying uncertainty in studies of forests is important to establish the significance of findings, make predictions with known confidence, and guide investments in research and monitoring. This symposium will address sources of uncertainty in estimates of carbon and nutrients in forest soils, above- and belowground biomass, and ecosystem inputs and outputs. Presentations will address sources of uncertainty in forest ecosystem studies, including natural spatial and temporal variation, measurement error, model uncertainty, and model selection error. Examples include the importance of spatial variation in detecting change over time in soil stores and measurement error in forest inventory due to identifying or classifying trees, measuring them, and determining whether trees are live or dead and in or out of a plot. Model uncertainty within and across models is important in biomass estimation and climate predictions. Presentations will also address how these uncertainties influence monitoring designs or affect management and policy decisions.
Organizers: Mary Beth Adams, Craig See, Ruth Yanai, and Scott Chang
Does Long-Term Storage of Air-Dried Soils Effect the Results of Chemical Analyses Commonly Performed on Forest Soils? Gregory Lawrence, Michael Antidormi*, Matthew Vadeboncoeur, Paul Hazlett, Ivan Fernandez, Scott Bailey, and Donald Ross. Slideshow PDF
Regional Scale Uncertainty Estimates from Fine-Scale Forest Inventory: Stored and Accumulated Forest Carbon in the Eastern US.
Bradley Tomasek*, Erin Schliep,Alan Gelfand,and James Clark. Slideshow PDF
Carbon Cycling of Forest Ecosystems As a Fuzzy System: An Attempt to Assess Uncertainties. Anatoly Shvidenko*, Florian Kraxner,Dmitry Schepaschenko,and Shamil Maksyutov. (Presentation not available)
International Long Term-Ecological Research Open Science Meeting
October 9-13, 2016, Kruger National Park, South Africa
The International LTER Network held its first global Open Science Meeting. QUEST collaborators organized an "Estimating Uncertainty in Measurements, Experiments, and Models Workshop.
Long Term-Ecological Research All Scientist's Meeting August 30-September 2, 2015, Estes Park, CO
This year's conference was organized around the theme "From Long-term data to understanding: toward a predictive ecology", and showcased 300 posters and more than 75 formal and ad-hoc working group meetings. QUEST collaborators meet informally, but also used their sites data in these presentations:
UFRO World Congress: Sustaining Forests, Sustaining People, The Role of Research October 5-11, 2014 Salt Lake City, Utah, USA.
Presenters from four different countries described sources of uncertainty in estimates of forest carbon and nutrient pools and fluxes, including natural spatial and temporal variation, measurement error, model uncertainty, and model selection, and addressed how these uncertainties can guide monitoring designs and affect management and policy decisions.
Technical Sessions #58A & B: Quantifying Uncertainty in Forest Measurements and Models: Approaches and Applications.
Subplenary session at IUFRO World Congress, Salt Lake City. October 5-11, 2014
Presentations shared approaches to analyzing uncertainty in forest measurements and giving examples of applications of uncertainty in above- and belowground estimates of forest biomass, carbon, and nutrient pools and fluxes, as well as other ecosystem attributes.
Tools for Estimating Uncertainty in Ecology @ ESA August 10, 2014
Although methods are well established for statistical analysis of most experimental designs, there are fields in Ecology where it is more difficult to establish confidence in results (e.g., in catchment studies, treatments are rarely replicated). For environmental networks, using standardized approaches ensures that results are comparable, but sometimes the same statistical technique is not applicable to comparable data sets (e.g. when there are significant differences in the sample size of the same population at two geographically distinct locations). Many of these concerns can be addressed through the appropriate use of tools for uncertainty analysis. This workshop will highlight current developments in uncertainty estimation across many fields of ecology. Overview presentations will focus on practical examples of how uncertainty calculations can inform data over small-to-large scales. Data packages and software tools will be shared with the attendees. Participants are encouraged to bring their own data sets and laptop computers; we will provide data for the exercises if you donít bring your own. We welcome participation by researchers in all career stages and from a broad array of ecological disciplines.
American Geophysical Union Annual MeetingSan Francisco, CA, August 5, 2013
Quantifying Uncertainty in Biogeochemical Studies I session. Oral presentations by Brent Aulenbach, John Campbell, Josh Roberti, and Ruth Yanai.
Uncertainty Analysis: A Critical Step in Ecological Synthesis August 5, 2013
Ruth Yanai, Jeffrey Taylor and Mark Harmon organized, and John Battles moderated an "Organized Oral Session" on Uncertainty Analysis: A Critical Step in Ecological Synthesis at the 2013 Ecological Society of America Annual Meeting in Minneapolis, MN.
Ecology is entering an exciting era in which the number and availability of long-term data sets are increasing exponentially. There is an unprecedented need to synthesize these data to address current scientific and societal problems. Great progress has been made on linking data and theory, including spatial integration and interdisciplinary combination. The question is no longer how to synthesize, but how well we link information from disparate sources and how to identify the most important areas for improvement. These synthetic approaches will demand increased proficiency and rigor in uncertainty analysis, to provide a metric of progress in synthesis science. This OOS highlights current developments in uncertainty estimation across many fields of ecology and provided guidance for large-scale synthesis research. Speakers were encouraged to provide recommendations for standardized approaches to uncertainty estimation and a vision for meeting future needs. Further development, understanding, and dissemination of the latest statistical techniques for deriving these estimates both inform ecological sampling design and equip up-and-coming ecologists with critical skills. Speakers examined sources of uncertainty and its general role in synthesis science. Case studies included a range of topics and approaches ranging from population ecology and small watershed nutrient cycling budgets to landscape carbon budgets. Methodologies presented include parametric statistical approaches, bootstrap analysis, Monte Carlo sampling, and Bayesian hierarchical analysis. Uncertainty introduced by spatial and temporal interpolation are common themes across scales from plots to the continental ecological observatory network.
2012 Long Term-Ecological Research (LTER) All Scientists MeetingEstes Park, CO, September 11, 2012
Quantifying Uncertainty in Ecosystem Studies - Organizers: Ruth Yanai, John Campbell and Carrie Rose Levine
Excerpts from the February 8, 2011 Webinar
This preceded the first Quantifying Uncertainty in Ecosystem Studies meeting in Boston, March 14-15 2011.
The webinar and meeting were the first phases of our Long Term Ecological Research Network Office Synthesis Working Group (LTER SWG)'s evaluation of uncertainty in hydrologic inputs, outputs, and net hydrologic flux of major elements across small watersheds with diverse characteristics.