Attributes for MRB_E2RF1 Catchments by Major River Basins in the Conterminous United States: Normalized Atmospheric Deposition for 2002, Ammonium (NH4)
type: Dataset
description: This tabular data set represents the average normalized (wet) deposition, in kilograms per square kilometer multiplied by 100, of ammonium (NH4) for the year 2002 compiled for every MRB_E2RF1 catchment of the Major River Basins (MRBs, Crawford and others, 2006). Estimates of NH4 deposition are based on National Atmospheric Deposition Program (NADP) measurements (B. Larsen, U.S. Geological Survey, written. commun., 2007). De-trending methods applied to the year 2002 are described in Alexander and others, 2001. NADP site selection met the following criteria: stations must have records from 1995 to 2002 and have a minimum of 30 observations. The MRB_E2RF1 catchments are based on a modified version of the U.S. Environmental Protection Agency's (USEPA) ERF1_2 and include enhancements to support national and regional-scale surface-water quality modeling (Nolan and others, 2002; Brakebill and others, 2011). Data were compiled for every MRB_E2RF1 catchment for the conterminous United States covering New England and Mid-Atlantic (MRB1), South Atlantic-Gulf and Tennessee (MRB2), the Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy (MRB3), the Missouri (MRB4), the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf (MRB5), the Rio Grande, Colorado, and the Great basin (MRB6), the Pacific Northwest (MRB7) river basins, and California (MRB8).
keyword: amerigeo
keyword: amerigeoss
keyword: ammonium-nh4
keyword: cali
keyword: california
keyword: catchment
keyword: ckan
keyword: cogb
keyword: conterminous-united-states
keyword: environment
keyword: geo
keyword: geoscientificinformation
keyword: geoss
keyword: glmr
keyword: great-lakes-ohio-upper-mississippi-and-souris-red-rainy
keyword: inlandwaters
keyword: lmtg
keyword: lower-mississippi-arkansas-white-red-and-texas-gulf
keyword: major-river-basins
keyword: missouri
keyword: mori
keyword: mrb
keyword: mrb1
keyword: mrb2
keyword: mrb3
keyword: mrb4
keyword: mrb5
keyword: mrb6
keyword: mrb7
keyword: mrb8
keyword: mrbe2rf1
keyword: mrbe2rf1ws
keyword: national
keyword: nawqa
keyword: nema
keyword: new-england-and-mid-atlantic
keyword: north-america
keyword: pacific-northwest
keyword: panw
keyword: rio-grande-colorado-and-great-basin
keyword: sagt
keyword: south-atlantic-gulf-and-tennessee
keyword: sparrow
keyword: united-states
issued: 2025-11-21T23:07:50.652016
modified: 20201117
theme: {geospatial}
contact point: Organization
  fn: Michael E. Wieczorek
spatial: Location

US Migrating
type: Agent

Original Metadata
type: Distribution
description: The metadata original format
media type: text/xml
format: XML
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.48087977-35c5-4918-8044-18176eef3a28.xml
issued: 2022-07-07T15:54:26.725626
modified: 2025-11-21T23:07:50.628820

Digital Data
type: Distribution
description: Landing page for access to the data
media type: application/http
format: XML
access URL: https://water.usgs.gov/lookup/getspatial
issued: 2022-07-07T15:54:26.725639
modified: 2025-11-21T23:07:50.629266