Attributes for NHDPlus Version 2.1 Flowlines for the Conterminous United States: Wet, Dry, and Total Deposition of Select Constituents from Community Multiscale Air Quality modeling system (CMAQ) for 2002 - 2012

Metadata Updated: November 12, 2020

This metadata record describes 10 annual Congestion Mitigation and Air Quality Improvement (CMAQ) Program variables ( kilograms per hectare) for the years 2002 - 2012 ( Zhang and others, 2012, Schwede and others, 2014) compiled for two spatial components of the NHDPlus version 2.1 data suite hereto referred to as (NHDV2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. This dataset can be linked to the NHDPlusv2 data suite by the unique identifier COMID. Reach catchment information characterizes data at the local scale. Reach catchments accumulated upstream through the river network characterizes cumulative upstream conditions. Network-accumulated values are computed using two methods, 1) divergence-routed and 2) total cumulative drainage area. Both approaches use a modified routing database to navigate the NHDV2 reach network to aggregate (accumulate) the metrics derived from the reach catchment scale. (Schwarz and Wieczorek, 2018) The following variables are in this dataset: 1) AWD_OXN_T: Bias and Precipitation Adjusted Wet Deposition of Oxidized Nitrogen. 2) AWD_REDN_T: Bias and Precipitation Adjusted Wet Deposition of Reduced Nitrogen per catchment. 3) AWD_S_T: Mean Precipitation Adjusted Wet Deposition of Total Sulfur per catchment. 4) DD_OXN_T: Mean Dry Deposition of Total Oxidized Nitrogen per catchment. 5) DD_REDN_T: Mean Dry Deposition of Total Reduced Nitrogen per catchment. 6) DD_S_T: Mean Dry Deposition of Total Sulfur per catchment. 7) D_OXN_T: Mean Total Deposition of Total Reduced Nitrogen per catchment. 8) TD_REDN_T: Mean Total Deposition of Total Reduced Nitrogen per catchment. 9) TD_S_T: Mean Total Deposition of Total Sulfur per catchment. 10) TD_N: Mean Total Deposition of Nitrogen (Oxidized + Reduced) per catchment.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date July 20, 2018
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2018 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date July 20, 2018
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2018 (publication)
Responsible Party US Geological Survey, Maryland Water Science Center (Point of Contact)
Contact Email
Guid
Access Constraints Use Constraints: These data do not represent actual footprints of conservation practices. Summaries that could possibly reveal locations and/or identities of any NRI sample site are not authorized and exceed the intended use of these data. One should use caution and read this document before using these data to estimate smaller areas. These data should not be used for site-specific evaluation, surveying, or engineering purposes. They also should not be used beyond the limits of the source data's scale. Use of these data is considered acceptance of these limitations and that the user has read and understood this metadata prior to its use in any form. The comparability of these data to previous NRI data is unknown. Users are advised to treat comparisons of the years with caution., Access Constraints: none
Bbox East Long -63.6722
Bbox North Lat 51.6672
Bbox South Lat 21.7423
Bbox West Long -130.2328
Coupled Resource
Frequency Of Update notPlanned
Licence Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2002-01-01
Temporal Extent End 2012-01-01

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