Is the growth rate of N 2 O increasing? Brad Hall 1 , Geoff Dutton 2 - - PowerPoint PPT Presentation

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is the growth rate of n 2 o increasing
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Is the growth rate of N 2 O increasing? Brad Hall 1 , Geoff Dutton 2 - - PowerPoint PPT Presentation

Jun 21, 2023 346 likes •605 views

Is the growth rate of N 2 O increasing? Brad Hall 1 , Geoff Dutton 2 , Ed Dlugokencky 1 , David Nance 2 , Debbie Mondeel 2 , Patricia Lang 1 , Andrew Crotwell 2 , James Elkins 2 1 NOAA/ESRL 2 University of Colorado/CIRES 2015 Global Monitoring

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Is the growth rate of N2O increasing?

Brad Hall1, Geoff Dutton2, Ed Dlugokencky1, David Nance2, Debbie Mondeel2, Patricia Lang1, Andrew Crotwell2, James Elkins2

1NOAA/ESRL 2University of Colorado/CIRES

2015 Global Monitoring Annual Conference, Boulder, CO

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agricultural soils natural soils

  • cean

industry biomass burning

  • ther

25% 25% 40%

N2O Source Distribution

Total source ~17 Tg-N yr-1 Total sink ~13 Tg-N yr-1

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Interannual Variability

– Thompson et al, 2013 – Ishijima, et al, 2009

  • ENSO, QBO
  • soil moisture
  • temperature

Seasonal Cycle

– Nevison et al, 2011 – Hamilton and Fan, 2000

  • STE
  • ocean exchange (thermal)

Global Emissions (inverse model, ecosystem model)

  • Thompson et al, 2014
  • Saikawa et al, 2014
  • Huang et al, 2008
  • Tian et al, 2015
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Global mean N2O

AGAGE data: https://agage.mit.edu/data/agage-data

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Instrumentation/Methods/Programs

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CATS CCG Otto

N2O growth rate

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Focus on 2002-2013: Expanded global coverage, improved instrumentation

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ppb yr-2

2ND Order Term, least squares fit: ppb yr-2 (2002-2013)

Individual programs at select measurement sites

0.005 0.01 0.015 0.02 0.025 alt brw mhd mlo kum smo cgo psa spo CATS in situ Otto flask CCG flask

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2ND Order Term, least squares fit: ppb yr-2 (2002-2013)

Zonal Means from CCG flask data ppb yr-2

0.000 0.005 0.010 0.015 0.020 0.025

Arctic NH Temp. NH Tropics SH Tropics SH Temp. global

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Ammonia (kilo tonnes) International Fertilizer Industry Association

10 000 20 000 30 000 40 000 50 000 60 000 70 000 80 000 2000 2005 2010 2015 North America East Asia EU 10 000 20 000 30 000 40 000 50 000 60 000 70 000 80 000 2000 2005 2010 2015 North America West Asia South Asia

Urea (kilo tonnes)

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Recent Emission Trends from Modeling Studies

South Asia, Asia

  • N. America, Europe

Tropical S. America, Africa

  • Fig. 6 from Tian et al, 2015 {doi/10.1890/EHS14-0015.1}

Inversion Ecosystem

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Zonal means: well-resolved gradients

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Compare N2O zonal averages

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Compare to SF6

Growth Rate

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Summary

  • N2O growth rate increasing since ~2003

>> acceleration: 0.014-0.016 ppb/yr2

  • observed globally
  • higher growth rates in S.H.
  • mean growth rate in 2013: ~1 ppb/yr
  • inter-hemispheric difference is decreasing

>> ~0.15 ppb over 10 years

  • influence of climate drivers on tropical S.H.

emissions?

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end

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N2O Growth Rate: 2002-2013 period

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Calibration: Reproducibility ~0.1 ppb (1-sigma)

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CPC Soil Moisture data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado

Monthly mean soil moisture

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N2O at Barrow, Alaska