2004-09-23 PM Event Detection from Time Series

PM Event Detection from Time Series ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Event : Deviation > x*percentile

Temporal Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Typical time series of daily AIRNOW PM25 over the Northeastern US

Temporal Signal Decomposition and Event Detection ,[object Object],[object Object],EUS Daily Average 50%-ile, 30 day 50%-ile smoothing Deviation from %-ile Event : Deviation > x*percentile Median Seasonal Conc. Mean Seasonal Conc. Average Median ,[object Object]

Seasonal PM25 by Region ,[object Object],[object Object],[object Object]

Northeast – Southeast Comparison ,[object Object],[object Object],[object Object],Northeast Southeast

Causes of Temporal Variation by Region ,[object Object],[object Object],[object Object],[object Object],Northeast exhibits the largest coeff. variation (56%); seasonal, noise and events each at 30% Southeast is the least variable region (35%), with virtually no contribution from events Southwest, Northwest, S. Cal. and Great Lakes/Plains show 40-50% coeff. variation mostly, due to seasonal and meteorological noise. Interestingly, the noise is about 30% in all regions, while the events vary much more, 5-30%

‘ Composition’ of Eastern US Events ,[object Object],[object Object],[object Object],[object Object],Based on VIEWS data

Event Definition: Time Series Approach ,[object Object]

Sulfate EUS Daily Average 50%-ile, 30 day 50%-ile smoothing Deviation from %-ile Event – Deviation > percentile value Median Seasonal Conc. Mean Seasonal Conc.

Temporal Pattern Regional Speciated Analysis - VIEWS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Regions of Aggregation

Dust ,[object Object],[object Object],[object Object],[object Object],US West East

Dust ,[object Object],Northeast Southwest Southeast

Dust ,[object Object],Northwest S. California Great Plaines

Amm. Sulfate ,[object Object],US West East

Amm. Sulfate ,[object Object],Northeast Southwest Southeast

Amm. Sulfate ,[object Object],Northwest S. California Great Plaines

Organic Carbon ,[object Object],US West East

Organic Carbon ,[object Object],Northeast Southwest Southeast

Organic Carbon ,[object Object],Northwest S. California Great Plaines

Reconstructed Fine Mass ,[object Object],US West East

Reconstructed Fine Mass ,[object Object],Northeast Southwest Southeast

Reconstructed Fine Mass ,[object Object],Northwest S. California Great Plaines

2004-09-23 PM Event Detection from Time Series

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2004-09-23 PM Event Detection from Time Series