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Development of A Bottom-up Soil NOx Inventory Neil E. Moore Dalhousie University 3 rd GEOS-Chem Users’ Meeting Apr. 12, 2007 R. V. Martin, A. Fiore, L.

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Presentation on theme: "Development of A Bottom-up Soil NOx Inventory Neil E. Moore Dalhousie University 3 rd GEOS-Chem Users’ Meeting Apr. 12, 2007 R. V. Martin, A. Fiore, L."— Presentation transcript:

1 Development of A Bottom-up Soil NOx Inventory Neil E. Moore Dalhousie University 3 rd GEOS-Chem Users’ Meeting Apr. 12, 2007 R. V. Martin, A. Fiore, L. Jaeglé, S. Koumoutsaris, N. Ramankutty, M. Friedl

2 Algorithm Components Soil NO x emissions within GEOS-CHEM: Soil temperature/soil moisture:Yienger and Levy (1995) Pulsing:Yienger and Levy (1995) Agriculture:Yienger and Levy (1995) Canopy recapture:Wang, Jacob, and Logan (1998) GEOS4 for the year 2000 Soil NO x total: 5.95 Tg N/yr (molec/cm 2 /s)

3 Motivation A posteriori soil NO x inventory for 2000 based on GOME Soil NO x total: 8.88 Tg N/yr GEOS-Chem soil NO x too low Jaeglé et al. (2005) Jaeglé et al. (2004) The first evidence of pulsing from satellite Factor of 2 higher within purple box (molec/cm 2 /s)

4 Soil Temperature/Soil Moisture (Δ molec/cm 2 /s) The old The new (van Dijk et al. (2002)) The result Input variable: Rainfall Input variable: Soil Moisture Δ Global Total = -0.8 Tg N/yr

5 Pulsing The old The new (Yan et al. (2005)) Triggers: - `Dry’ soil - Sufficient Rainfall Triggers: - θ < 0.35 - θ increase of 0.01 - Depends on dry period Δ Global Total ≈ 0 Tg N/yr The result (Δ molec/cm 2 /s)

6 Fertilizer-Induced Emissions The old - Dataset: 75 Tg N applied/year - 100% of fertilizer is applied at start - Growing season is fixed (May-Aug) - Emissions are fixed (2.5% of applied fertilizer) - Contributes 0.7 Tg N/yr to total The new - Dataset: 92 Tg N applied/year (Ramankutty) - 75% applied over first month; 25% for rest (Matson et al. (1998)) - MODIS data (Friedl) sets growing season - Fertilizers are subject to exponential loss -- exp(-t/τ). τ ranges from 1-2 months (Fenn et al. (1998)). Emissions = 2.5% of fertilizer.

7 Fertilizer-Induced Emissions Δ Global Total = +0.2 Tg N/yr The result (τ = 1.5 months) (Δ molec/cm 2 /s)

8 Deposition as a Fertilizer Source The new: - Treat the wet and dry deposition of HNO 3, NH 3, NH 4 +, and NO 3 2- as an additional fertilizer source. - The fraction of these that does not runoff contributes to NO x emissions. The result (τ = 1.5 months) Δ Global Total = +2.3 Tg N/yr (Δ molec/cm 2 /s)

9 Taken Together Considering all four modifications: soil temp./soil moisture, pulsing, agriculture, deposition The result (τ = 1.5 months)The final result Δ Global Total = +1.9 Tg N/yrGlobal Total = 7.8 Tg N/yr (molec/cm 2 /s)(Δ molec/cm 2 /s)

10 Thank You

11

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