1 NO x emissions from power plants in China: bottom-up estimates and satellite constraints Siwen Wang, 1,3 Qiang Zhang, 2 David G. Streets, 3 Kebin He,

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Presentation transcript:

1 NO x emissions from power plants in China: bottom-up estimates and satellite constraints Siwen Wang, 1,3 Qiang Zhang, 2 David G. Streets, 3 Kebin He, 1 Randall V. Martin, 4 Lok N. Lamsal, 4 Sicong Kang, 1 and Dan Chen 5 1 State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing , China 2 Center for Earth System Science, Tsinghua University, Beijing , China 3 Decision and Information Sciences Division, Argonne National Laboratory, Argonne, IL 60439, USA 4 Department of Physics and Atmospheric Science, Dalhousie University, NS B3H 3J5, Canada 5 Department of Atmospheric and Oceanic Sciences, University of California at Los Angeles, CA 90095, USA Presented at 5 th GEOS-Chem Meeting 2011, Boston, USA May 03, 2011

2 Dramatic increase of thermal generation capacities in Consequence of the fast economic growth and electricity shortage in the early of 2000s Increase rates differ in size  92.2% of the increased capacities in are from generator units ≥ 300 MW Proportion of the generator units < 300 MW decreased to 37.6% at the end of 2007

3 The unit-based power plant NO x emission inventory  Time period:  Time resolution: Monthly  Database: ~5,700 individual units (data from MEP)  Data: Location, capacity, boiler type, technology, coal consumption, the month when unit came into operation 8.11 Tg9.58 Tg

4  Based on DOMINO NRT products (version 1.0.2, collection 3)  The cross-track bias in tropospheric slant column densities was corrected following the approach described by Celarier et al. (2008)  We use nested-grid a priori NO 2 profiles (0.5°x 0.667°) to calculate the AMF Model and Satellite data We used OMI tropospheric NO 2 columns (DP_GC) developed by Lamsal et al. (2010) GEOS-Chem  v ; Nested-Grid ( 0. 5°x 0.667°); GEOS-5; 47 vertical levels  Period:  Anthropogenic NO x emissions: unit-based power plant inventory + others use the same methodology in Zhang et al. (2007)  Two scenarios: GC_S0 --- with all emissions GC-S1 --- remove emissions from new generator units (units came into operation between 2005 and 2007)

5 Impacts of new power plant NO x emissions on NO 2 profiles Shangdu: rural area (a) at 0. 5°x 0.667° (b) at 2°x 2.5° Lanxi: small town (c) at 0. 5°x 0.667° Baotou: urban (d) at 0. 5°x 0.667°

6 Comparison of the OMI and GC tropospheric NO 2 columns for summers (JJA) of 2005 and 2007 Top row: 2005; Bottom row: 2007 Modeled columns are lower than OMI measurements in city corridors in Shanxi-Shaanxi- Inner Mongolia region OMIGCOMI - GC

7 Correlations of summer NO 2 columns over power plants (PP) Step1: All grids in China Step2: Grids with PP Step3: PP emissions > 60% Step4: PP emissions > 60% Urban pop.< 0.5 million Top row: 2005; Bottom row: 2007

8 Increase ratio of summer NO 2 columns (2007 to 2005) detected by OMI Circle dots indicate the locations of new power plants during

99 Increase ratio of summer NO 2 columns (2007 to 2005) from OMI and GC model: coastal areas OMIGC (S0) GC without new PP (S1) Impact of meteorology (monsoon)? Impact of a priori NO 2 profile, e.g., under-sample (Hechel, et al., 2011) ?

10 Temporal evolution of NO 2 columns over individual power plants  with large new generation capacities (≥1200 MW)  located in grids with less urban population (< 0.3 million)  positions of new power plants are nearby the centers or on windward sides in the corresponding model grids  located in inland

11 Acknowledgements This work is funded by Project of Monitoring and Management on Emission Reduction, managed by the Ministry of Environmental Protection of China, and the National Aeronautics and Space Administration ’ s Program on Decision Support through Earth Science Research Results. DOMINO NRT data are produced by KNMI in the Netherlands in collaboration with NASA ( Thank you for your attention!

12  Based on DOMINO NRT products (version 1.0.2, collection 3)  The cross-track bias in tropospheric slant column densities was corrected following the approach described by Celarier et al. [2008]  GEOS-Chem a priori NO 2 profiles (2°x 2.5°)  Improved performance in summer compared to in situ measurements in the United States DP_GC OMI product developed by Lamsal et al. (2010) Figure 5b in Lamsal et al. (2010) Blue - NASA Standard OMI products Red - DOMINO OMI products Green - improved DOMINO OMI products