Using Giovanni for Retrospective Analysis of Air Quality Events

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Using Giovanni for Retrospective Analysis of
Air Quality Events
Ana I. Prados, UMBC/JCET Ana.I.Prados_at_nasa.gov
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What is Giovanni ?

• Giovanni is a Web-based application developed by
  the NASA Goddard Earth Sciences Data and
  Information Services Center (GES DISC).
• Giovanni provides a simple and easy way to
  explore, visualize, analyze, and access vast
  amounts of Earth science remote sensing and model
  data.
• Giovanni is NOT a near real time tool (data
  generally available within 1-3 days)
• http//giovanni.gsfc.nasa.gov/

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Giovanni at your Finger Tips

• Only a Web browser is
• needed.

• No need to learn data formats and programming.

• No need to download large amounts of data.

• Customized data and analyses can be obtained with
  only a few mouse clicks.

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Giovanni Data
Giovanni Tools
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Analysis of U.S Air Quality
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Giovanni Air Quality Datasets

• Particulate Air Quality (not NRT products)
• PM2.5 station data - Acquired at DataFed from EPA
  AIRNow and then via WCS into Giovanni
• MODIS TERRA and AQUA total and fine mode Aerosol
  Optical Depth (AOD)
• MISR AOD
• CALIOP Aerosol Feature Mask vertical curtain
  plots
• OMI UV Aerosol Index
• GOCART Model data AOD speciation (2x2.5 degree)
• Trace Gases (not NRT products)
• OMI NO2 Tropospheric column (0.25x0.25 degree)
• AIRS CO and methane (profile data)

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Giovanni Tools for Air Quality Applications

• Temporal and geographical selection of data
  products - Lat/lon maps with overlay option, time
  series, and Hovmoller plots for customized
  visualization of air quality events
• Combined surface monitor and satellite data -
  AOD/ PM2.5 scatter plots, correlation maps, time
  series and difference plots for analysis and
  source attribution of pollution events
• Temporal Animation plots of air quality data
  products for examining long range transport of
  pollutants

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• Giovanni Air Quality Data Products

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OMI Tropospheric NO2 Column

• Sensitive in the Boundary layer
• Qualitative agreement with high NOx regions (i.e
  urban areas)

June 22, 2007
October 25th, 2007

• Note Slightly different product than KNMI NO2
• Not a near real time product

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MODIS Aerosol Optical Depth

• At least two daily observations - Terra and Aqua
• Sensitive to Boundary Layer Industrial, smoke
  dust aerosols
• Well validated over land
• Fine mode fraction

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OMI UV Aerosol Index

• Mostly sensitive to absorbing aerosols above the
  planetary boundary layer , i.e. smoke plumes and
  dust

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Giovanni AIRNow PM2.5 Gridded Data
Giovanni PM2.5 Map (ug/m3)

• Giovanni PM2.5 map Data from EPA AIRNow.

AIRNow PM2.5 Air Quality Index Map
Note Acquired by Giovanni from DataFed via WCS.
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Cloud-Aerosol Lidar and Infra-Red Pathfinder
Satellite Observation (CALIPSO) 3D
Visualization of Air Pollution

• CALIPSO has a lidar that provides information
  about the vertical distribution of particles
• Useful in conjunction with column AOD
• Spatial resolution (vertical) 30 60 m
• Temporal resolution 16 days 20 50 km

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Giovanni A-Train Obtaining CALIPSO KMZs for
3D-Visualization
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Select A-Train Instance parameter(s)
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Most Giovanni data sets available in KML (Google
Earth, and other tools)
Calipso in Giovanni Vertical Distribution of
Aerosols 3D-Vis

• October 27th, 2007
• OMI Aerosol Index in Background
• Vertical Calipso Curtain Plot
• Yellow aerosol flag
• Blue cloud flag

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NASA GOGART Model Particle Speciation

• Global chemical transport model with gas phase
  and aerosol chemistry
• Daily and Monthly data at 2x2.5 degree
  resolution
• Giovanni allows colocation with satellite and
  EPA AIRNow data
• Source attribution for pollution events

California and Southwestern US
Eastern US
Sea salt Organic Carbon Dust
Black carbon Sulfate
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NASA GOCART Model Particle Speciation
Sulfate
Black Carbon
Organic Carbon
Dust
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How do I acquire and generate the image
visualizations ?
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Instance Page for Gridded data
Description
Spatial Selection
Some instances have vertical or wavelength
selection
Parameter Selection
Temporal Selection
Visualization Selection
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Spatial Selection
Click and drag
Panning
Click to select a map layer
Zooming
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Parameter Selection
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Temporal Selection
The example shown is temporal selection for an
instance featuring 3-hourly data.
Dropdown menus for Date and Time selections.

• Instances for monthly data have dropdown menu
  for Year and Month selections
• Instances for daily data have dropdown menu for
  Year, Month, and Day selections.
• Instances for hourly data have dropdown menu for
  Year, Month, Day, and Hour selections.

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Visualization Selection
Click to select a Visualization (also referred to
as Analytical Function). Lat-Lon Map,
Time-averaged is the common default option.
Click to display the description of the selected
Visualization (Analytical Function).
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Giovanni Results Page

• Result navigation tabs
• Home
• Result List
• Download Data
• Data Product Lineage
• Acknowledgment Policy
• Images
• Refine Constraints
• Spatial selection
• Temporal selection
• Graphical preferences
• Submit Refinements

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Results Page Visualization result
Result Navigation Tabs
Download Data
Download Data
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Results Page Downloading data
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Results Page - Acknowledgment Policy
Acknowledging the use of Giovanni is very
important to us and to NASA. http//disc.sci.gsfc
.nasa.gov/giovanni/Giovanni_usage_guidelines.shtml

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Examples of Giovanni capabilities for
retrospective analysis of US Air Quality
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PM2.5, MODIS and OMI Views of California
FiresOctober 2007
OMI UV Aerosol Index
EPA AIRNow PM2.5(ug/m3)
Level-3 MODIS AOD
Oct. 24th
Oct. 25th
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Aerosol Pollution over the Eastern US haze,
clouds or smoke ?

• July 7th, 2006
• MODIS Terra True Color imagery
• Source MODIS Rapidfire

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Giovanni can help Surface monitor and satellite
data July 7th, 2006
OMI Aerosol Index
AIRNow PM2.5
MODIS AOD

• Moderate PM2.5
• Smoke
• OMI measures only absorbing aerosols (smoke or
  dust)

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Satellite measurements are a total column, not
always correlated with PM2.5 !!!
Northeast US - Smoke above the PBL - Satellite
shows pollution but PM2.5 shows good air quality
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Surface Monitor-Satellite ComparisonsJune 15-
July 15th, 2006
MODIS/PM2.5 correlation
MODIS/ PM2.5 time series
Satellite measurements are a total column --- not
necessarily correlated with PM2.5 concentrations
!!!
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Aerosol Pollution on July 7th industrial
(sulfate) or smoke ?

• GOCART Model
• July 7th relatively high organic and black
  carbon over eastern US

Organic Carbon Black carbon Sulfate
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Aerosol Pollution over the Eastern US GOCART
Model data via Giovanni
Sulfate
Organic Carbon Black carbon Sulfate
Organic Carbon

• Smoke in the Northeast, mixture of smoke and
  industrial aerosols over the southeast

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But wait, how about California and the central US
?

• We are out of time, lets try a hands on exercise
  to learn more !!

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Coming Soon to Giovanni.

• HTAP Model Data
• Meteorological and chemical speciation data from
  models for examining long range transport of
  pollutants
• Comparisons among satellite, model, and in-situ
  air quality data

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How can I learn more about Air Quality
Applications of NASA Earth Science data and
Giovanni ??

• Check our web site regularly at
• http//aerocenter.gsfc.nasa.gov/asrs
• to find out about more workshops in 2009 on
  use of NASA Earth Science data sets and tools,
  including Giovanni
• Further info Ana.I.Prados_at_nasa.gov