Understanding Ozone Transport in California: Local & Transported Ozone in 15 Air Basins, Slides of Data Communication Systems and Computer Networks

Download Understanding Ozone Transport in California: Local & Transported Ozone in 15 Air Basins and more Slides Data Communication Systems and Computer Networks in PDF only on Docsity!

Ozone transport network

Overview

• Introduction
• My goal and Problems
• Methodology
  • Two way to solve the problems
  • How to connect this network to our course?
  • Where my data come from?
• Reference
• Questions

Why California

• California has the highest ozone level

My goal

 Goal: to build a complex network of ozone transport

based on 15 basins

California is divided into 15 Air Basins to better manage air pollution. Air basin boundaries were decided by grouping similar geographic features together. Some air basins really are like a basin, with valleys surrounded by mountains. Political boundaries, Such as counties, were also important.

 In this network, the nodes represent all basins and the

edges represent the ozone transportation between them.

 Local Ozone

Local ozone concentrations

=

Natural ozone

Transported ozone (generated from emissions from upwind

cities and natural events such as wildfires)

Local ozone (generated from local anthropogenic emissions)

7

Problems

Problems (1 of 2)

 Background ozone

• What is the typical natural background ozone concentration?

 Transport

• How much ozone, above natural background, was transported into each city or basin?
• What are the typical source areas for transported ozone?

Methodology

1. Statistcal Analyses

Analyses of the time of peak ozone concentration at various monitoring sites can yield useful information on transport patterns and source areas.

In most major source areas of interest in California, transport winds are light in the morning, allowing ozone precursor concentrations to build up and zone to form.

A B

A Wind^ B

Morning

1. Statistcal Analyses

Methodology

Peak Local Ozone = Incoming (natural background + transported anthropogenic) + Local Anthropogenic

• System developed to calculate incoming ozone

(Clinton P. MacDonald)

 Ran multiple backward trajectories each day for five years (2001–2005, April–October);  Determined the daily peak 8-hr ozone concentration at the last site near which each trajectory passed during daylight hours prior to entering each city; and  Averaged all concentrations to estimate incoming boundary layer concentration each day.

How to connect this network to our

course?

• Do analysis and calculate the centrality, betweennees, closeness and other parameter of each node to know the relationship betweeen them

Ozone Transport sketch map of San Francisco Bay Area Air Basin

Where my data come from?

• California Environmental Protection Agency:

Air Resources Board.

• California’s ambient air monitoring network is

one of the most extensive in the world, consisting of over 250 sites where air pollution levels are monitored and more than 700 monitors used to measure the pollutant levels.

Where my data come from?

http://www.arb.ca.gov