Michael E. Wieczorek Andrew E. LaMotte 2010 tabular digital data Digital Data Series DS-491-27 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1_tin This tabular data set represents the average normalized atmospheric (wet) deposition, in kilograms per square kilometer multiplied by 100, of Total Inorganic Nitrogen for the year 2002 compiled for every MRB_E2RF1 catchment of selected Major River Basins (MRBs, Crawford and others, 2006). Estimates of Total Inorganic Nitrogen 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). This tabular data set was created and used by the U.S. Geological Survey (USGS) specifically to estimate atmospheric deposition (wet) of Total Inorganic Nitrogen in kilograms per square kilometer multiplied by 100 for 2002 per watershed segment in the application of the national SPAtially Referenced Regression On Watershed attributes (SPARROW) model . The SPARROW model relates in-stream water-quality measurements to spatially referenced characteristics of watersheds, including contaminant sources and factors influencing terrestrial and stream transport. The model empirically estimates the origin and fate of contaminants in streams, and quantifies uncertainties in these estimates based on model coefficient error and unexplained variability in the observed data. For more information on the USGS SPARROW model please refer to: http://water.usgs.gov/nawqa/sparrow/intro/intro.html. Alexander, R.B., Smith, R.A. Schwarz, G.E., Preston, S.D., Brakebill, J.W., Srinivasan, R., and Pacheco, P.A., 2001, Atmospheric nitrogen flux from the watersheds of major estuaries of the United States: An application of the SPARROW watershed model, in Valigura, R., Alexander, R., Castro, M., Meyers, T., Paerl, H., Stacey, P., and Turner, R.E., eds., Nitrogen loading in coastal water bodies: An atmospheric perspective: American Geophysical Union Monograph 57, p. 119-170. 2002 publication date Complete None planned -127.910792 -65.327751 51.657387 23.243486 None Total Inorganic Nitrogen Inlandwaters MRB_E2RF1 MRB_E2RF1WS Catchment NAWQA SPARROW None Conterminous United States MRB Major River Basins MRB1 NEMA New England and Mid-Atlantic MRB2 SAGT South Atlantic-Gulf and Tennessee MRB3 GLMR Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy MRB4 MORI Missouri MRB5 LMTG Lower Mississippi, Arkansas-White-Red, and Texas-Gulf MRB6 COGB Rio Grande, Colorado, and Great Basin MRB7 PANW Pacific Northwest MRB8 CALI California None None Michael E. Wieczorek U.S. Geological Survey mailing address

5522 Research Park Drive

Baltimore MD 21228 USA 443-498-5550 443-498-5510 mewieczo@usgs.gov http://water.usgs.gov/GIS/browse/mrb_e2rf1_tin.jpg Illlustration of data set JPG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 Charles G. Crawford Pixie A. Hamilton Anne B. Hoos October 5, 2006 Reston, Virginia U.S. Geological Survey Prepared by Charlie Crawford, Pixie Hamilton, and Anne Hoos for a NAWQA National Liaison Meeting, Washington D.C., October 5, 2006. http://water.usgs.gov/nawqa/studies/mrb/mrb_factsheet.pdf None None Jacqueline V. Nolan John W. Brakebill Richard B. Alexander Gregory E. Schwarz Febuary 22, 2002 vector digital data USGS Open-File Report USGS Open-File Report 02-40 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?erf1_2 online 2002 publication date ERF1_2 The modified version of the source data provided a reach network to construct reach catchments for MRBs and subsequent processing (J.W. Brakebill, U.S. Geological Survey, written commun., 2008). John W. Brakebill Silvia E. Terziotti 20110222 vector digital data General Information Web Only Baltimore, MD U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1 online 2011 publication date MRB_E2RF1 The source data provided a reach network to construct reach catchments for MRBs and subsequent processing. John W. Brakebill Silvia E. Terziotti 20110222 raster digital data General Information Web Only Baltimore, MD U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1ws online 2011 publication date MRB_E2RF1WS The source data provided reach catchments for MRBs and subsequent processing. 1) Received 1-kilometer Total Inorganic Nitrogen GRID from USGS (John Brakebill, U.S. Geological Survey, written commun., 2008). The Total Inorganic Nitrogen GRID was processed by John Brakebill of the USGS who used point data received from NADP (B. Larsen, U.S. Geological Survey, written. commun., 2008). Total Inorganic Nitrogen is the sum of NO3 and NH4 (at each NADP site) after de-trending according to the methods outlined by Alexander and others (2001). To create the final grid, the Inverse Distance Weighting interpolation function was used in ArcInfo with 3 as the power option, SAMPLE as the keyword, and 5 as the number of nearest input sample points. 2) Resampled the Total Inorganic Nitrogen GRID from 1 kilometer to 100 meters to match the resolution of the MRB_E2RF1WS catchment GRID. The resulting grid values are Total Inorganic Nitrogen in kilograms per square kilometer multiplied by 100, in order to retain decimal places and to keep the GRID in an integer format that requires less computer space for storage. 3) Summarized Total Inorganic Nitrogen deposition by catchment using the ZONALSUM command in GRID. 4) Exported results into a dbf file format. 2008 Metadata imported. T:\MRB\meta\RF1\xml\tin_rf1.xml 20100830 09404900 tin_rf1 dbf tabular data ESRI COV_PERC Percent of catchment that source GRID covers U.S. Geological Survey 0.0 100.0 Percentage OID Internal feature number ESRI Sequential unique whole numbers that are automatically generated TIN_02 Estimated Total Inorganic Nitrogen deposition in kilograms per square kilometer multiplied by 100 for 2002 for each catchment U.S. Geological Survey 4.78 10641660000 kilograms multiplied by 100 TIN_02_ARE Area of catchment that the source GRID covers U.S. Geological Survey 10000 206651100000 Square meters RF1ID Unique ID to relate to the item MRB_ID in the MRB_E2RF1WS catchment and MRB_E2RF1 reach coverages. U.S. Geological Survey Sequential unique whole numbers that are automatically generated BASIN_AREA Area of catchment in square meters U.S. Geological Survey 10000 2066510700 Square meters NODATA_ARE Area of catchment that source GRID does not cover U.S. Geological Survey 0.0 144154400000.0 Square meters U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although this dataset has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. dbf Full coverage zipped 58 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb1.zip dbf Full coverage zipped 131 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb2.zip dbf Full coverage zipped 189 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb3.zip dbf Full coverage zipped 198 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb4.zip dbf Full coverage zipped 132 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb5.zip dbf Full coverage zipped 64 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb6.zip dbf Full coverage zipped 185 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb7.zip dbf Full coverage zipped 30 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_tin_mrb8.zip None. This dataset is provided by the USGS as a public service. 20100817 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+mrb_e2rf1_tin FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998