Tropospheric Ozone Changes:

Observations, state of understanding, and modeling requirements

Workshop at NOAA Earth System Research Laboratory, Boulder, Colorado USA

October 14-16, 2009

The workshop will focus on measurement series ~15 years or longer in length and aims at a critical review of ozonesonde, surface, and aircraft measurements and more recently satellite observations. It will address the quality of individual datasets, their suitability for inferring the long-term behavior of ozone, the consistency of data sets with each other (see figure below), and statistical methods of time series analysis. One goal of the workshop is to provide better understanding of the observational limitations and constraints of the existing records. The measurement community and those engaged in analyses of the data will share their expertise. The workshop will also benefit from modelers who have looked at longer term changes in tropospheric ozone and can lend their perspective on how observations and modeling can be combined to lead to a better understanding of changes in tropospheric ozone. A major goal of the workshop is to determine what the robust changes in ozone have been in various regions as inferred from the entire suite of reliable data. The agenda will include an opportunity for presentations on:

  • Observational time series (their strengths and weaknesses).
  • Consistency of various data records.
  • Statistical techniques and their application in detecting long term changes.
  • Assessment of our understanding of long term variability.
  • Evaluation of models with observations and using models to improve our understanding.

Figure: Comparison of ozonesonde and aircraft data over Europe (from J. Logan)


If you plan on attending the conference, please complete the online registration. Registration has closed
You can also email your plans to attend and presentation topic to:



The hotels listed below have been contacted about the workshop. Two of them have set aside rooms for the workshop. This is a very busy weekend in Boulder. The rooms set aside for the workshop will be held until September 13, 2009. If you plan to attend the workshop, early hotel reservations are advised. Information on other hotels in Boulder is given below under “Lodging Information”.

Millennium Harvest House
1345 28th Street Boulder, Colorado 80302
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Best Western Boulder Inn
770 28TH Street Boulder, Colorado 80303-2343
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  • Website:
  • Phone: 303-449-3800
  • Toll Free Reservations: 800-233-8469
  • E-Mail:
  • Group code: call 800-233-8469 and reference code “OZONE"
  • Arrival Date: Tuesday, October 13, 2009
  • Departure Date: Saturday, October 17, 2009
  • Group Rates: $89 for a room with one King bed on the 13th and 14th, $139.99 for a room with one king bed on the 15, 16, or 17th.
  • To hold rates, reservations must be made 30 days prior to arrival. NOTE: 24 hour cancellation policy for 10/13 & 10/14. 30 day cancellation applies to 10/15, 16, & 17.

Boulder Outlook Hotel & Suites
800 28TH Street Boulder, Colorado 80303
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  • Website:
  • Reservations: 800-542-0304 or 303-443-3322
    Reference NOAA Ozone Workshop when making reservations to receive discounted rate. Phone reservations are preferable. If you do go online be certain to reference NOAA Ozone Workshop in the remarks section.
  • Discounted rates will be held until September 13th. Please note that October 16th is booking quickly.

    October 13, 14 and 15

    • $79.00 – Standard Double or King – 1 or 2 people
    • $89.00 – Standard Double – 3 or 4 people
    • $89.00 – Pool Double or King – 1 or 2 people
    • $99.00 – Pool Double – 3 or 4 people

    Friday October 16 (booking quickly)

    • $105.00 – Pool or Standard Room – 1 or 2 people
    • $115.00 – Pool or Standard Room – 3 or 4 people
    • $115.00 – Executive King or Double – 1 or 2 people
    • $125.00 – Executive Double – 3 or 4 people

Getting to ESRL

ESRL is located in the David Skaggs Research Center (DSRC) at 325 Broadway, in Boulder, Colorado, next to the Department of Commerce National Institute of Science and Technology (NIST) building.
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Map of driving route from DIA to Boulder and NOAA.

Driving Directions from DIA

Toll Free:

  • Exit Denver International Airport via Peña Boulevard.
  • Take Peña Boulevard to I-70 West.
  • Split right on I-270 North (Exit 279), toward Ft. Collins and follow across I-25 to US-36 toward Boulder.
  • Take US-36 (Boulder Turnpike) West.
  • Exit US-36 at Baseline Road (University of Colorado Main Campus exit).
  • Keep left and turn left (West) onto Baseline.
  • Keep left and turn left at the first light onto 27th Way.
  • Stay in the middle lane and turn left onto Broadway.
  • Take the second right at the light onto Rayleigh Rd. and bear right into the Visitors Center parking lot.

Toll Road:

  • Exit Peña Boulevard at E-470 and follow to US-36. Tolls are $6.00 each way.

By Bus

Regional bus service to Boulder is available through the RTD. The B bus provides regional service between Denver and Boulder. The Flatiron Park-n-Ride (Broadway and 27th Way) is the closest stop to ESRL and is on the Skip, Bound, 204, 227, AB, B, D, G, and J bus routes.

Security Procedure for Visitors

  • Visitors are required to sign in and receive a visitor badge from the Visitors Center at the Security Checkpoint. Visitors will need to present a U.S. photo ID or foreign passport. No other forms of identification are accepted.
  • To receive a visitor badge, all visitors are required to park next to the Security Checkpoint and enter the Visitors Center to be screened before proceeding to their destination.
  • These are our requirements as per Homeland Security regardless of security threat level. If you have any questions, please contact Keith Turbitt at (303) 497-4332.

Lodging Information

Area Restaurants

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