Story Line: Bias in data

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Presentation transcript:

Story Line: Bias in data Here is a not-so-well maintained or well sited USHCN station at Marysville

Tools & Data Historical Climate Network version 2 dataset (NCDC ftp area) Health of the Network web system (NCDC web site) Climate at a Glance web system (NCDC web site) http://www.ncdc.noaa.gov

How Calculating ^Crafty Claude Carefully Clarified the Climate Clutter NCDC team members: Claude Williams – scientist Sam McCown – Team Facilitator Betsy Youngman: curriculum developer Steve Carlson: Educator Mark Lackey: Notetaking coordinator

Simulated Temperature Series with Shifts Caused by Station Moves and Siting Changes

Types of Bias Location Moves Instrument Changes Changes in Observational Practices Microclimate changes Urban Heat Island

Simulated Temperature Series with Shifts Caused by Station Moves and Siting Changes Case 7 unadjusted

Simulated Temperature Series with Shifts Caused by Station Moves and Siting Changes

Reno, Nevada Example of Multiple biases at one station Move to Airport Likely urban warming Red adjusted Black unadjusted ASOS Equip. Moves Example of Multiple biases at one station Mean annual TOB and fully adjusted (TOB+Pairwise) minimum temperatures

Adjusted Minimum Temperature Series at Marysville, CA

USHCNv2 National Average