CABOTS 2016 – California Baseline Ozone Transport Study

This page last reviewed March 5, 2019


CABOTS (California Baseline Ozone Transport Study) 2016 is a major air quality study in California conducted by San Jose State University (SJSU), the National Oceanic and Atmospheric Administration (NOAA), the National Aeronautic and Space Administration (NASA-Ames), the University of California Davis (UCD), and the California Air Resources Board (CARB). The field study took place from mid-May to mid-August of 2016. During this period Professor Sen Chiao of SJSU launched near daily ozone sondes at Bodega. The ozone sondes provided daily ozone vertical profiles which will be compared with global models. To provide ozone profiles up to 6 km above ground level in the San Joaquin Valley at the Visalia Airport, NOAA deployed an ozone light detection and ranging instrument (lidar) for two 3 weeks periods, May 29 to June 18, 2016-“Spring” and July 18 to August 7, 2016-“Summer.” Two NASA aircraft and two additional small planes were to collect aloft data to help characterize ozone above the San Joaquin Valley and Bay Area. The study will address important scientific questions on transport and air quality in California. The air quality and meteorological data collected during CABOTS will improve CARB’s modeling of criteria air pollutants and precursors used in SIP development and our understanding of the atmospheric formation of ozone.

Below you will find background documents from the planning stage, the field study phase, and the data analysis phase of CABOTS.

Workshop Presentations

February 27, 2018

  1. Meeting Agenda (PDF)
  2. Update on the BAAQMD-ARB/Ramboll Project (PDF)
  3. SJSU Ozonesonde Data Analysis (PDF)
  4. Comparisons between TOPAZ Data, Surface/Aircraft Measurements, and Models (PDF)
  5. CABOTS UCD Aircraft Analysis (PDF)
  6. New NASA AJAX Paper on Observation-based Analysis of Vertical Ozone (PDF)

April 19, 2017

  1. Workshop Agenda (PDF)
  2. SJSU ozone sonde measurements (PDF)
  3. Stratospheric influence on surface ozone in the San Joaquin Valley during CABOTS, (PDF)
  4. CABOTS Observations from Chews Ridge & Aircraft (PDF)
  5. AJAX Flights in Support of CABOTS: Status of Analysis (PDF)
  6. WRAP-Background O3 Scientific Assessment Workshop Denver, March 28-29, 2017 (PDF)
  7. Satellite-based products & tools to support quantification & attribution of background O3 (PDF)
  8. Ozone Simulation During CABOTS Period (PDF)
  9. Improving West Coast Ozone Boundary Conditions for Regional Air Quality Models (PDF)

July 2016

  1. Presentation CARB Overview of CABOTS (July 2016, PDF)
  2. NOAA Presentation - CABOTS & Sierra Nevada Alpine Environment (PDF)
  3. San Jose State University Presentation - Ozonesonde Measurements (PDF)
  4. NASA Presentation - AJAX Flights in Support of CABOTS
  5. UC Davis Presentation - Residual Layers Aloft and Other Work with EPA, BAAQMD, ARB including at Chew’s Ridge (PDF)
  6. BAAQMD Presentation - Data Analysis and Modeling Plans for CABOTS (PDF)
  7. CABOTS and Ozone Effects - Sierra Nevada Alpine Env-Leaving California
  8. CARB's Global Transport Web Page

ozone monitoring vehicle
NOAA TOLNET Ozone Lidar at Visalia Airport