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Generating NADP Deposition Maps using Cokriging

Generating NADP Deposition Maps using Cokriging. Chris Lehmann & Bob Larson* Data Management and Analysis Subommittee April 2007. Cokriging.

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Generating NADP Deposition Maps using Cokriging

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  1. Generating NADP Deposition Maps using Cokriging Chris Lehmann & Bob Larson* Data Management and Analysis Subommittee April 2007

  2. Cokriging • Cokriging uses information from multiple variables. The main variable (Z1), and both autocorrelation with Z1 and cross-correlations between Z1 and other variables are used to make predictions • If you have a sparse network of data (i.e., NADP sites) and a more dense network of data (i.e., NWS sites), co-kriging uses data from more dense network to aid interpolation of sparse nework.

  3. What we tried • Obtained NWS cooperative network from Midwest Regional Climate Center (MRCC) • Quality-assured for completeness • Removed outlier • Cokrigged ammonium and sulfate against NWS data • ESRI ArcView 9.1 Geostatistical Analyst Wizard • CAVEAT: Neither Bob nor I are geostatisticians.

  4. Ammonium Kriging with 3rd Order Trend Removal

  5. Ammonium Cokriging with 3rd Order Trend Removal

  6. Sulfate Cokriging with 3rd Order Trend Removal

  7. Discussion… • Develop whitepaper on possible data interpolation procedures, their assumptions, and pro/cons? • Find a real geostatistician?

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