CalNex Data Workshop 11-Jan-2011 Characterizing near-shore and off-shore air masses in southern CA during CalNex Brian Lerner 1, 2, Jim Johnson 3, 4, Eric.

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Presentation transcript:

CalNex Data Workshop 11-Jan-2011 Characterizing near-shore and off-shore air masses in southern CA during CalNex Brian Lerner 1, 2, Jim Johnson 3, 4, Eric Williams 1, 2 1 NOAA ESRL CSD, Boulder CO 2 CIRES, University of Colorado at Boulder 3 NOAA PMEL, Seattle WA 4 JISAO, University of Washington

Outline CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air 1.Review of measurements; status of data “Cleaning” the data of influence from Atlantis “Cleaning” the data of influence from Atlantis 2.Gridding the data by location 3.Characterizing near-shore / off-shore air CO, NO y and O 3 CO, NO y and O 3 Wind direction Wind direction 4.Photochemical age Clean marine vs. Los Angeles bight Clean marine vs. Los Angeles bight

1-min resolution files Gas-phase species: NO, NO 2, NO y, O 3, CO, CO 2, SO 2, H 2 O Directly measured photolysis rates: NO 2, NO 3, O 3 →O[1D] Derived photolysis rates: ClNO 2, Cl 2, HONO, HCHO, etc. Met. data: T, RH, pressure, wind speed and direction 1-s resolution data available by request Overview of measurements “Final” data has been posted on the data server: CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Sampling Main inlet and anemometer located at starboard, forward corner of walk-up tower. Main inlet and anemometer located at starboard, forward corner of walk-up tower. Due to location of tower relative to Atlantis exhaust stack, data filtered by relative wind direction from stern [135° wedge] and relative wind speed [< 0.02 m/s]. Due to location of tower relative to Atlantis exhaust stack, data filtered by relative wind direction from stern [135° wedge] and relative wind speed [< 0.02 m/s]. This removes ≈ 4.4% of sampling time from the dataset. CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Working with the data Traditionally, we work with data using time series How about another approach? CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Working with the data CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air Putting the data on a map

Emissions and photochemistry by location Comparison of CO and O 3 footprint CO gradient decreases as ship moves away from the coast Ozone gradient increases as ship moves away from the coast CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Observable gradient from coast out to sea: What about NO x ? What about NO x ? NO primarily emitted, but significant NO 2 measured. NO primarily emitted, but significant NO 2 measured. Rapid titration reaction with ozone Rapid titration reaction with ozone NO + O 3 → NO 2 + O 2 Better to consider O x [= NO 2 + O 3 ] Better to consider O x [= NO 2 + O 3 ] Emissions and photochemistry by location CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

How do the species mixing ratios change as a function of wind direction? Emissions and photochemistry by location CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Dividing the grid into regions: near-shore/off-shore LA basin (LA and Orange Counties) Two grid cells removed from grouping: LAX and ports (special cases) Aggregating the data by location Near Off CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air CO NO x & NO y O 3 & O x

A further look at off-shore air O x vs. CO How can we make sense of this scatterplot? With a digression... CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air

Characterizing marine background NO x < 0.25 ppbv Radon < 200 CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air Trend likely from mixing of clean tropical and very old polluted air

A further look at off-shore air CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air How does the SB-Monterrey air compare with So. CA off-shore air? Finding a correlation in the off-shore data: What is reasonable? Increasing slope = more processing

What’s next to do? How well does Flexpart predict CO, NOy, etc. at ship location? How well does Flexpart predict CO, NOy, etc. at ship location? Can we characterize the source and age of the ozone-enriched air off-shore? Can we characterize the source and age of the ozone-enriched air off-shore? How does air transported across LA basin to Pasadena compare to air that ages over the water? How does air transported across LA basin to Pasadena compare to air that ages over the water? Summary Evaluating dataset by location important to making sense of observations Evaluating dataset by location important to making sense of observations Near-shore air shows marked differences in photochemical processing as a function of wind direction Near-shore air shows marked differences in photochemical processing as a function of wind direction Off-shore air generally well-mixed, independent of wind direction Off-shore air generally well-mixed, independent of wind direction OVOCs? Organic acids? SOA? OVOCs? Organic acids? SOA? CalNex data workshop: Outline / Data overview / Working with the data / So. CA: CO, NO x and O 3 / Marine air / Characterizing LA bight air