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
Maps of 2016 Tidal Trends
Maps of Tidal Trends: ShortTerm - Surface
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Annual Surface Total Nitrogen 2007-2016 (1.64 MB)
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Annual Surface Dissolved Inorganic Nitrogen 2007-2016 (1.64 MB)
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Annual Surface Total Phosphorus 2007-2016 (1.64 MB)
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Annual Surface Orthophosphate 2007-2016 (1.64 MB)
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Annual Surface Chlorophyll-a 2007-2016 (1.64 MB)
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Annual Surface Total Suspended Solids 2007-2016 (1.64 MB)
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Annual Secchi Disk Depth 2007-2016 (1.64 MB)
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Annual Water Temperature 2007-2016 (1.64 MB)
Maps of Tidal Trends: Short Term - Bottom
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Annual Bottom Total Nitrogen 2007-2016 (1.64 MB)
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Annual Bottom Dissolved Inorganic Nitrogen 2007-2016 (1.64 MB)
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Annual Bottom Total Phosphorus 2007-2016 (1.64 MB)
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Annual Bottom Orthophosphate 2007-2016 (1.64 MB)
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Annual Bottom Chlorophyll-a 2007-2016 (1.64 MB)
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Annual Bottom Total Suspended Solids 2007-2016 (1.64 MB)
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Summer Bottom Dissolved Oxygen 2007-2016 (1.64 MB)
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Annual Bottom Water Temperature 2007-2016 (1.64 MB)
Maps of Tidal Trends: Long Term - Bottom
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Annual Bottom Total Nitrogen 1999-2016 (1.64 MB)
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Annual Bottom Dissolved Inorganic Nitrogen 1999-2016 (1.64 MB)
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Annual Bottom Total Phosphorus 1999-2016 (1.64 MB)
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Annual Bottom Orthophosphate 1999-2016 (1.64 MB)
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Annual Bottom Chlorophyll-a 1999-2016 (1.64 MB)
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Annual Bottom Total Suspended Solids 1999-2016 (1.64 MB)
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Summer Bottom Dissolved Oxygen 1985-2016 (1.64 MB)
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Annual Bottom Water Temperature 1985-2016 (1.64 MB)
Maps of Tidal Trends: Long Term - Surface
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Annual Surface Total Nitrogen 1999-2016 (1.64 MB)
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Annual Surface Dissolved Inorganic Nitrogen 1999-2016 (1.64 MB)
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Annual Surface Total Phosphorus 1999-2016 (1.64 MB)
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Annual Surface Orthophosphate 1999-2016 (1.64 MB)
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Annual Surface Chlorophyll-a 1999-2016 (1.64 MB)
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Annual Surface Total Suspended Solids 1999-2016 (1.64 MB)
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Annual Secchi Disk Depth 1985-2016 (1.64 MB)
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Annual Water Temperature 1985-2016 (1.64 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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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...
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December 27, 2016
Numerical and Qualitative Contrasts of Two Statistical Models for Water Quality Change in Tidal Waters. Beck, M. and Murphy, R. R. (2016)
Two statistical approaches, weighted regression on time, discharge, and season and generalized additive models, have recently been used to evaluate water quality trends in estuaries. Both models have been used in similar...