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Title: Uncertainty in North America wet deposition isopleth maps: Effect of site selection and valid sample criteria

Abstract

This report considers several issues related to the preparation of isopleth maps for the display of spatial patterns of wet deposition. The valid sample criteria and data completeness rating used in the data summarization process are described. The data interpolation technique, kriging, is presented and it's derivation in terms of generalized least squares regression is given. Four different annual summaries for pH, sulfate concentration, and sulfate deposition in 1986 are prepared using either the Unified Deposition Database Committee (UDDC) definition of valid sample criteria or a relaxed valid sample criteria and the UDDC data completeness rating or a relaxed data completeness rating. The kriged estimates for the different annual summaries and the differences between these estimates are contoured. The effects of relaxing the valid sample criteria and data completeness rating are discussed. Conclusions are drawn about network operation, network design and the uncertainty of contour maps. It is recommended that in the case where the objective is contour maps to show regional patterns, the emphasis in most regions needs to be on the number of valid samples per site and the regional representativeness of the sites. 4 refs., 14 figs., 7 tabs.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (USA)
Sponsoring Org.:
USEPA
OSTI Identifier:
7000106
Report Number(s):
PNL-7291
ON: DE90008205
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; WASHOUT; MAPPING; ECOLOGICAL CONCENTRATION; INTERPOLATION; KRIGING; LEAST SQUARE FIT; MATHEMATICAL MODELS; NORTH AMERICA; PH VALUE; REGRESSION ANALYSIS; SITE SELECTION; SPATIAL DISTRIBUTION; SULFATES; VALIDATION; DISTRIBUTION; MATHEMATICS; MAXIMUM-LIKELIHOOD FIT; NUMERICAL SOLUTION; OXYGEN COMPOUNDS; PRECIPITATION SCAVENGING; SEPARATION PROCESSES; STATISTICS; SULFUR COMPOUNDS; TESTING; 540220* - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Simpson, J C, and Olsen, A R. Uncertainty in North America wet deposition isopleth maps: Effect of site selection and valid sample criteria. United States: N. p., 1990. Web. doi:10.2172/7000106.
Simpson, J C, & Olsen, A R. Uncertainty in North America wet deposition isopleth maps: Effect of site selection and valid sample criteria. United States. doi:10.2172/7000106.
Simpson, J C, and Olsen, A R. Sun . "Uncertainty in North America wet deposition isopleth maps: Effect of site selection and valid sample criteria". United States. doi:10.2172/7000106. https://www.osti.gov/servlets/purl/7000106.
@article{osti_7000106,
title = {Uncertainty in North America wet deposition isopleth maps: Effect of site selection and valid sample criteria},
author = {Simpson, J C and Olsen, A R},
abstractNote = {This report considers several issues related to the preparation of isopleth maps for the display of spatial patterns of wet deposition. The valid sample criteria and data completeness rating used in the data summarization process are described. The data interpolation technique, kriging, is presented and it's derivation in terms of generalized least squares regression is given. Four different annual summaries for pH, sulfate concentration, and sulfate deposition in 1986 are prepared using either the Unified Deposition Database Committee (UDDC) definition of valid sample criteria or a relaxed valid sample criteria and the UDDC data completeness rating or a relaxed data completeness rating. The kriged estimates for the different annual summaries and the differences between these estimates are contoured. The effects of relaxing the valid sample criteria and data completeness rating are discussed. Conclusions are drawn about network operation, network design and the uncertainty of contour maps. It is recommended that in the case where the objective is contour maps to show regional patterns, the emphasis in most regions needs to be on the number of valid samples per site and the regional representativeness of the sites. 4 refs., 14 figs., 7 tabs.},
doi = {10.2172/7000106},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {4}
}