Reductions in no 2 driven by policy and recession
Download
1 / 12

Reductions in NO 2 Driven by Policy and Recession - PowerPoint PPT Presentation


  • 64 Views
  • Uploaded on

Reductions in NO 2 Driven by Policy and Recession. Patricia Castellanos 1 & K. Folkert Boersma 1,2 AGU . 2 Eindhoven University of Technology, Fluid Dynamics Lab. 1 Royal Netherlands Meteorological Institute (KNMI). Why do we care about NO 2 o ver Europe?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Reductions in NO 2 Driven by Policy and Recession' - lonna


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Reductions in no 2 driven by policy and recession

Reductions in NO2 Driven by Policy and Recession

Patricia Castellanos1 &K. Folkert Boersma1,2

AGU

2Eindhoven University of Technology, Fluid Dynamics Lab

1Royal Netherlands Meteorological Institute (KNMI)


Why do we care about no 2 o ver europe
Why do we care about NO2over Europe?

2008 NO2 Annual Mean [μg/m3]

  • Ozone precursor

  • Aerosol formation

  • Eutrophication of soil and water

  • Acid deposition

  • Toxic at high concentrations

  • Limits were supposed to be reached by 2010

  • Timeline will be extended by 5 years without penalty

Bad air quality costs the UK 8.5-20 billion pounds per year, and can cut life expectancy by years – UK Environmental Audit Committee

  • Poorly quantified high biases

  • Lack spatial representativity

  • Reporting issues

  • Need an independent assessment of changing NO2 concentrations

Satellite Observations


No 2 trends from space
NO2 Trends From Space

  • Satellites provide

    • Global coverage

    • Independent & self-consistent time series

  • Monitor effectiveness of pollution abatement strategies

Space-based European NO2 column trends in the literature

A Few % Per Year


No 2 column trends
NO2 Column Trends

  • Different summer and winter NO2 lifetimes

    • Large seasonal fluctuations

      • Normally only look at one season

    • Transport effects in winter but not in summer

      • Cannot always assume some regular seasonal variability

Separate the slow-moving trend from other variability

Amsterdam


Frequency separation kz filter
Frequency Separation – KZ Filter

K-iterations of a moving average

Trends based on low-pass filtered data

Transfer Function

# of Iterations


No 2 column trends august
NO2 Column Trends: August

2006/2005

2007/2005

2005

2009/2005

2010/2005

2008/2005


No 2 trends relate to economic indicators
NO2 Trends Relate to Economic Indicators


Fitting the no 2 trend
Fitting the NO2 Trend

  • Differentiate between policy (pre-recession) and recession related NO2 changes

European Average

continuous

continuous + recession


2004-2010 Continuous Change

Recession Change

[Ccontinuousx 6 years]

[Crecession]

European Average


Recession period reductions were the same or greater thanpre-recession reductions

One year of economic recession outweighed ~4-years of policy improvements


Uncontrolled shipping emissions may be reducing air quality in the countries bordering the English channel

2004-2007 Reported NOxEmissions trend ÷ Ccontinuous trend

Report increased emissions but NO2 has decreased

UK reports reduced emissions but NO2 has increased


Final remarks
Final Remarks in the countries bordering the English channel

  • High resolution daily OMI observations allow us to analyze spatially AND temporally heterogeneous trends

  • NO2 concentrations over Europe are 10-50% lower than in 2004

  • Fast declines in NOx emissions during the economic recession led to 15-30% NO2 reductions in 2008-09

European NO2 column trends in the literature


ad