Nitrogen, phosphorus, and suspended-sediment loads and trends measured at the Chesapeake Bay Nontidal Network stations: Water years 1985-2018 (ver. 2.0, May 2020)
Dates
Publication Date
2020-02-18
Start Date
1984-10-01
End Date
2018-09-30
Revision
2020-05-18
Citation
Moyer, D.L., and Langland, M.J., 2020, Nitrogen, phosphorus, and suspended-sediment loads and trends measured at the Chesapeake Bay Nontidal Network stations: Water years 1985-2018 (ver. 2.0, May 2020): U.S. Geological Survey data release, https://doi.org/10.5066/P931M7FT.
Summary
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal Network (NTN) stations for the period 1985 through 2018. Nutrient and suspended-sediment loads and changes in loads were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). The load results represent the total mass of nitrogen, phosphorus, and suspended sediment that was exported from each of the NTN watersheds. To determine the trend in loads, the annual load results are flow normalized to integrate out the year-to-year variability in river discharge. The trend in [...]
Summary
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal Network (NTN) stations for the period 1985 through 2018. Nutrient and suspended-sediment loads and changes in loads were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). The load results represent the total mass of nitrogen, phosphorus, and suspended sediment that was exported from each of the NTN watersheds. To determine the trend in loads, the annual load results are flow normalized to integrate out the year-to-year variability in river discharge. The trend in load is derived from the flow-normalized load timeseries and represents the change in load resulting from changes in sources, delays associated with storage or transport of historical inputs, and (or) implemented management actions. Four data tables are provided that describe nitrogen, phosphorus, and suspended-sediment conditions across the NTN: (1) Annual Loads, (2) Monthly Loads, (3) Trends in Annual Loads, and (4) Average Yield (mass per unit area). Additionally, essential WRTDS Input and Output files are provided. All data tables can be accessed through each respective "Child Item" listed on this page.
First posted: February 18, 2020 (available from author)
Revised: May 2020 (version 2.0)
Click on title to download individual files attached to this item.
NTN_1985-2018_Landing_ver2.0.xml Original FGDC Metadata
View
9.78 KB
application/fgdc+xml
R-3.6.0-win.exe “Source Code for R”
79.86 MB
application/x-msdownload
EGRET_2.6.0.tar.gz “Source Code for EGRET (contains WRTDS)”
3.51 MB
application/x-gzip
EGRETci_1.0.2.tar.gz “Source Code for EGRETci (for computing trends)”
146.55 KB
application/x-gzip
NTN Load and Trend Summary 2018_ver.2.0.pdf “Summary of NTN Loads and Trends”
8.58 MB
application/pdf
NTN_ver.2.0_Revision_Notes.txt “Document of revision history”
14.4 KB
text/plain
Purpose
The purpose of this data release is to provide datasets for 1985-2018 (1) Annual Loads, (2) Monthly Loads, (3) Long- (~1985-2018) and Short- (2009-2018) Term Trends, and (4) 5-Year (2014-2018) and 10-Year (2009-2018) Average Yields. Additionally, essential WRTDS Input and Output files are provided.
Revision 2.0 by Douglas L. Moyer on May 18, 2020. To review the changes that were made, see “NTN_ver.2.0_Revision_Notes.txt” in the attached files section.
