2002 day by analysis

Slide1: 

Daily Analysis of Two Ozone Episodes in August of 2002 Ozone maps, back trajectories and profiler data are provided for each day during the episodes. Detailed notes on synoptic conditions and ozone concentrations are provided in the notes.

Slide2: 

Transport: The 24hr back trajectories were fast from the northwest extending into MI. July 31, 2002

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LLJ: LLJ was present at the Fort Meade Profiler beginning ~ 01:00 UTC on the morning of July 31. 2002. The LLJ was from the northwest winds maximum speeds ~10ms-1. The LLJ persisted until sunrise. 7/30 12z 7/31 00z 7/31 12z July 31, 2002

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Transport: The 24hr back trajectories were more northerly than the previous day terminating in Western NY and Northwest PA. August 1, 2002

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LLJ: There was no LLJ present at the Fort Meade Profiler during the morning of August 1, 2002. Weak westerly winds were observed during the pre dawn hours; after sunrise weak northeast winds prevailed. 7/31 12z 8/01 00z 8/01 12z August 01, 2002

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Transport: The 24hr back trajectories ending on August 2nd persisted from the north but were lighter than the previous day extending only as far north as North Central PA. August 2, 2002

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LLJ: There was no LLJ observed during the morning of August 2nd as the winds were generally less than 10 ms-1. However, the winds within the nocturnal boundary layer did have the directional shear (west to north with height) that is often associated with LLJ activity. The wind speed to not meet the criteria adopted for LLJ activity. 8/01 12z 8/02 00z 8/02 12z August 2, 2002

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Transport: The 24hr back trajectories ending August 3rd were very weak and suggested recirculation as trajectories sharply veered from the north to south August 3, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 3rd. The direction of the LLJ was from the southwest with maximum wind speeds of 11ms-1. A brief interruption in profiler data during occurred during the LLJ and, therefore, a lower limit on the duration of the LLJ is estimated to be 4hrs. 8/02 12z 8/03 00z 8/03 12z August 3, 2002

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Transport: The 24hr back trajectories ending August 4th were weak and from the southwest. The trajectories only extended as far south as Richmond VA. August 4, 2002

Slide11: 

There was LLJ activity observed during the early morning hours of August 4th. The direction of the LLJ was from the southwest with maximum wind speeds of 11ms-1. The duration of the LLJ was ~4 hrs. 8/03 12z 8/04 00z 8/04 12z August 4, 2002

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Transport: The 24hr back trajectories were light from the west-northwest extending only as far west as Pittsburg, PA. August 5, 2002

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LLJ: The profiler experienced another brief outage during this period and therefore there was no direct observation of LLJ activity however MM5 analysis fields suggest there was weak LLJ activity with winds from the southwest 5-7 ms-1. However the MM5 did forecast a LLJ from the southwest with maximum wind speeds in excess of 10ms-1. 8/04 12z 8/05 00z 8/05 12z August 5, 2002

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Transport: The 24hr back trajectories ending August 10th were very weak and suggested recirculation as trajectories sharply veered from the north to south August 10, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 10th. The direction of the LLJ was from the southwest with maximum wind speeds of 10ms-1 and had a 6 hr duration. 8/10 12z 8/11 00z 8/11 12z August 10, 2002

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Transport: The 24hr back trajectories ending on August 11th were south to southwest extending into southwestern WV. August 11, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 11th. The direction of the LLJ was from the southwest with maximum wind speeds of 15ms-1 and duration over 6hrs. 8/10 12z 8/11 00z 8/11 12z August 11, 2002

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The 24hr forecast back trajectories show a shift to westerly transport extending to southeastern OH. The upwind O3 concentrations at 1600 UTC on August 11 in the vicinity of the origin of the forecast back trajectories is enhanced, on the order of 78-86 ppbv. August 12, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 12th. The direction of the LLJ was from the southwest with maximum wind speeds of 15ms-1 and duration over 6hrs. 8/11 12z 8/12 00z 8/12 12z August 12, 2002

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The 24hr back trajectories continued to be westerly but were weaker than the previous day reaching the WV/Ohio border. August 13, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 13th. The direction of the LLJ was from the southwest with maximum wind speeds of 10ms-1 and duration of 5hrs. 8/12 12z 8/13 00z 8/13 12z August 13, 2002

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Transport: : The 24hr back trajectories were from the southwest on the 14th , the trajectories were stronger than previous days extending as far south as Central NC. August 14, 2002

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LLJ: There was LLJ activity observed during the early morning hours of August 14th. The direction of the LLJ was from the southwest with maximum wind speeds of 15ms-1 and duration of 7hrs. 8/13 12z 8/14 00z 8/14 12z August 14, 2002

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Transport: : The 24hr back trajectories were from the southwest on the 15th extending into NC. Deeper onshore flow into that region lower regional ozone concentrations. August 15, 2002

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LLJ: There was LLJ type activity observed during the early morning hours of August 15th. The LLJ extended a little deeper into the boundary layer (1.5km) than observed with other LLJs. 8/14 12z 8/15 00z 8/15 12z August 15, 2002