Movie: Hourly NE Ozone and Back Trajectories on 5/23/92

Description:

This is a comparison of measured ozone in the Northeast (right), with back-trajectories (left) during 5/23/92. The monitoring data were extracted from the AIRS database, and the back trajectories were created using the CAPITA Monte Carlo.

Purpose:

The goal of the multi-view animation is to simultaneously present ozone and airmass history data during an ozone episode in New England. The airmass histories are to provide meteorological context to the interpretation of the ozone data.

Method:

The ozone data (right figure) were taken from the hourly ozone data stored in the AIRS database. The back trajectories were calculated using the CAPITA Monte Carlo model, and the Eulerian wind fields generated from the National Meteorological Centers Nested Grid Model, with 180 km resolution. Ten particles were released from each site at two hour time increments and tracked backwards for five days.

Interpretation:

The high ozone episode is associated with an airmass that stagnated over a region extending from Indiana to Maryland about two to three days before being transported to New England.

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