HYSPLIT Part 1: Trajectories

Glenn Gehring, Office of Air Quality

Dept. of Science and Engineering

Confederated Tribes of the Umatilla Indian Reservation

Glenn Gehring, Office of Air Quality

Dept. of Science and Engineering

Confederated Tribes of the Umatilla Indian Reservation

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Hybrid Single-Particle Lagrangian

Integrated Trajectory model

WHAT??

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I think I’ll call it HYSPLIT

What??

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Who Provides it?Who Provides it?

Air Resources Laboratory (ARL) provides products related to atmospheric dispersion and air quality

ARL mandated by Congress shortly after WWII—concerns about pollution transport (nuclear fallout initial concern)

ARL now within National Oceanic and Atmospheric Administration (NOAA)

Air Resources Laboratory (ARL) provides products related to atmospheric dispersion and air quality

ARL mandated by Congress shortly after WWII—concerns about pollution transport (nuclear fallout initial concern)

ARL now within National Oceanic and Atmospheric Administration (NOAA)

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What HYSPLIT DoesWhat HYSPLIT Does

modeling tool used for computing wind trajectories in three dimensions complex pollutant dispersion, deposition patterns

can be used online or downloaded and used on your computer

can provide short-term forecasts for pollutant dispersion, or wind trajectories, using National Weather Service forecast meteorological data

can help us predict air quality and explore existing pollution episodes in near-real-time, and increase understanding of past pollution episodes

modeling tool used for computing wind trajectories in three dimensions complex pollutant dispersion, deposition patterns

can be used online or downloaded and used on your computer

can provide short-term forecasts for pollutant dispersion, or wind trajectories, using National Weather Service forecast meteorological data

can help us predict air quality and explore existing pollution episodes in near-real-time, and increase understanding of past pollution episodes

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Why Do We Use it?Why Do We Use it? forecast smoke impacts from

proscribed burns or wildfires assess

Contributors to high pollutant concentrations observed on our monitors

transport patterns day/night/seasonal differences

forecast smoke impacts from proscribed burns or wildfires

assess Contributors to high pollutant

concentrations observed on our monitors transport patterns day/night/seasonal differences

But Mainly…

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To Find Out Where is it Going

To Find Out Where is it Going

Proscribed burn

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And Where it Came FromAnd Where it Came From

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How Does it Work?How Does it Work?

Some day I’ll tell you. But right now my name isn’t Dr. Glenn and I don’t have a clue. Lets focus on how to use it.

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If You Want Details, They’re There

If You Want Details, They’re There

http://www.arl.noaa.gov/ready/hysplit4.html

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Some ExamplesSome Examples

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HYSPLIT in BlueSkyRAINSHYSPLIT in BlueSkyRAINS

Umatilla Indian Reservation

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Cherokee Nation Stilwell Site

90ppb 8-hour ozone

Quapaw Nation83ppb 8-hour ozone

Two Ozone Sites on 4/12/2003

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Stilwell SiteStarting with highest concentration at the analyzer, a 24-hour backward trajectory shows where parcel of air located, at 1-hour intervals, before it entered analyzer

GRDA Plume ConcentrationGradient

GRDA

Muskogee

Northeastern

24-Hr. Forward Plume Starting 4/11/03 Back Trajectory Starting 2 PM 4/12/03Stillwell 8-hour Ozone - 0.090 PPM

Tahlequah Site

1-Hour Before

24-Hours Before

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3/20/2002 Great Basin National Park

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6-Days Elevated Ozone at CTUIR

6-Days Elevated Ozone at CTUIR

Miles

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6 days Low Ozone at CTUIR6 days Low Ozone at CTUIR

Miles

Wind speed and other conditions matter. Not just direction.

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Highest Passive Ozone (24-hour Sample)

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Eli Shoshone August 2002 Backward Trajectories(Michael Dalton’s work – monthly trajectory patterns)

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NOAA’s HYSPLIT Online Modeling Tool: A Backward Trajectory Demonstration

NOAA’s HYSPLIT Online Modeling Tool: A Backward Trajectory Demonstration

21Select Compute trajectories

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EDAS 40Provides best resolution, butlimited to post- 2003 dates

Alaska may need to use global reanalysis

Select Met dataset

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Select date for met dataapr03 is April 2003 001 is day 1 through 15 of month002 is day 16 to end of month

24Enter latitude, longitude of monitoring site

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Backward trajectories

Elevations of trajectories

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31Save text file for GIS integration

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Open Text File in Excel and Modify

Open Text File in Excel and Modify

Then save as a text file

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Open ArcCatalog, Right Click on Text File and Create Feature

Class from XY Table

Open ArcCatalog, Right Click on Text File and Create Feature

Class from XY Table

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Left Click, Hold and Drag to MapLeft Click, Hold and Drag to Map

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There IS More to it – You’ll Learn that in the Trajectory

Exercise and in Your Practice

There IS More to it – You’ll Learn that in the Trajectory

Exercise and in Your Practice