Integrated Trends Analysis Team
Scope and Purpose
The Integrated Trends Analysis Team aims to combine the efforts of the Chesapeake Bay Program analysts with those of investigators in governmental, academic, and non-profit organizations to identify potential research synergies and collaborations that will enhance our understanding of spatial and temporal patterns in water quality.
Specific Goals:
(1) Gather researchers and analysts from various governmental, academic, non-profit, and private organizations for biannual meetings to identify the broad scope of on-going work related to trends and patterns of water quality in the Chesapeake watershed and estuary.
(2) Discover previously un-identified linkages among the ongoing research activities of participating individuals and organizations.
(3) Develop a standard set of analysis tools that can be applied in any relevant ecosystem within the Chesapeake watershed and estuary.
(4) Foster increased collaboration and awareness of ongoing research.
(5) Provide a forum for bringing findings to the broader Chesapeake Bay management community.
Membership in the Integrated Trends Analysis Team is currently not formally defined. If you would like to receive invitations to upcoming meetings, contact Kyle Hinson to request that your name and email address be added to the Team's distribution list.
Projects and Resources
Additional 2017 Tidal Trends
Additional Long-Term Tidal Trends
Additional Long-Term Flow-Adjusted Tidal Trends
Additional Short-Term Tidal Trends
Additional Short-term Flow-Adjusted Trends
Maps of 2017 Tidal Trends
1. Long-Term Tidal Trends
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Surface TN, Annual, 1985-2017 (1.58 MB)
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Surface TP, Annual, 1985-2017 (1.58 MB)
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Secchi Disk Depth, Annual, 1985-2017 (1.57 MB)
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Surface Total Suspended Solids, Annual, 1999-2017 (1.57 MB)
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Surface Water Temperature, Annual, 1985-2017 (1.58 MB)
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Surface Chlorophyll-a, Spring, 1985-2017 (1.58 MB)
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Surface Chlorophyll-a, Summer, 1985-2017 (1.58 MB)
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Bottom Dissolved Oxygen, Summer, 1985-2017 (1.58 MB)
2. Long-term Flow-Adjusted Tidal Trends
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Surface TN, Annual, 1985-2017 (1.58 MB)
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Surface TP, Annual, 1985-2017 (1.58 MB)
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Secchi Disk Depth, Annual, 1985-2017 (1.58 MB)
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Surface Total Suspended Solids, Annual, 1999-2017 (1.58 MB)
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Surface Water Temperature, Annual, 1985-2017 (1.58 MB)
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Surface Chlorophyll-a, Spring, 1985-2017 (1.62 MB)
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Surface Chlorophyll-a, Summer, 1985-2017 (1.62 MB)
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Bottom Dissolved Oxygen, Summer, 1985-2017 (1.58 MB)
3. Short-term Tidal Trends
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Surface TN, Annual, 2008-2017 (1.58 MB)
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Surface TP, Annual, 2008-2017 (1.58 MB)
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Secchi Disk Depth, Annual, 2008-2017 (1.57 MB)
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Surface Total Suspended Solids, Annual, 2008-2017 (1.58 MB)
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Surface Water Temperature, Annual, 2008-2017 (1.58 MB)
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Surface Chlorophyll-a, Spring, 2008-2017 (1.58 MB)
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Surface Chlorophyll-a, Summer, 2008-2017 (1.58 MB)
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Bottom Dissolved Oxygen, Summer, 2008-2017 (1.58 MB)
4. Short-term Flow-Adjusted Tidal Trends
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Surface TN, Annual, 2008-2017 (1.58 MB)
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Surface TP, Annual, 2008-2017 (1.58 MB)
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Secchi Disk Depth, Annual, 2008-2017 (1.58 MB)
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Surface Total Suspended Solids, Annual, 2008-2017 (1.58 MB)
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Surface Water Temperature, Annual, 2008-2017 (1.58 MB)
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Surface Chlorophyll-a, Spring, 2008-2017 (1.62 MB)
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Surface Chlorophyll-a, Summer, 2008-2017 (1.62 MB)
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Do b summer 08to17-flow (1.58 MB)
GAM Documentation
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Draft-GAM Method for Chesapeake 5-10-18 (1.06 MB)
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Appendix 1A Baytrends Quick Start Instructions (2.2 MB)
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Appendix 2.1A example R Package Files (852.74 KB)
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Appendix 2.3A - QW Data Format (164 KB)
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Appendix 2.4A Ex GAM Models (690.32 KB)
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Appendix 2.5A Percent Change (519.04 KB)
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Appendix 2.6A Censored Data Approaches (618.3 KB)
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Appendix 2.6B Summary of Censoring (582.23 KB)
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Appendix 2.6C Censoring Scenarios (8.24 MB)
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Appendix 2.7A Lab Change Approach (693.63 KB)
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Appendix 2.8A Create Seasonally Detrended Flow and salinity Data sets (288 KB)
Seasonal Kendall & GAM Comparison
This tab provides documentation for efforts to compare methods between the Seasonal Kendall and GAM statistical approaches to determining water quality trends.
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Measuring and Explaining Trends in Water Quality - Jeni Keisman (240.31 KB)
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Water Quality Criteria Attainment Patterns - Mindy Ehrich (3 MB)
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GAM Development Briefing Oct 2015 - Rebecca Murphy (1.72 MB)
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Monitoring Data in Support of Mid-Point Assessment - Doug Moyer, Joel Blomquist, Jeni Keisman (7.27 MB)
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SK/GAM Comparison - Kyle Hinson (940.52 KB)
ITAT Web Publishing Policy
This document outlines the policies that the Integrated Trends Analysis Team will follow in publishing meeting presentation materials for a public audience.
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Web Publishing Policy (91.3 KB)
Publications
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March 28, 2019
Murphy, R.R., Perry, E., Harcum, J. and Keisman, J. 2019. A Generalized Additive Model approach to evaluating water quality: Chesapeake Bay case study. Environmental Modelling and Software 118: 1-13. https://doi.org/10.1016/j.envsoft.2019.03.027
Documentation of GAM approach used for tidal trends in Chesapeake Bay. Link to the final manuscript, or contact rmurphy@chesapeakebay.net for the final version.
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June 30, 2016
ITAT June 2016 Newsletter
The June 2016 newsletter contains important and informative updates regarding the synethesis efforts and recent publications by team members and interested parties. For more information and to submit work that you would...
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October 17, 2016
ITAT October 2016 Newsletter
The October 2016 newsletter contains important and informative updates regarding the synethesis efforts and recent publications by team members and interested parties. For more information and to submit work that you would...