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Little net clear-sky radiative forcing from recent regional redistribution of aerosols

Abstract

Aerosols both scatter and absorb incoming solar radiation, with consequences for the energy balance of the atmosphere. Unlike greenhouse gases, atmospheric aerosols are distributed non-uniformly around the Earth. Therefore, regional shifts in aerosol abundance could alter radiative forcing of the climate. Here, I use multi-angle imaging spectroradiometer (MISR) satellite data and the Atmospheric and Environmental Research radiative transfer model1 to assess the radiative effect of the spatial redistribution of aerosols over the past decade. Unexpectedly, the radiative transfer model shows that the movement of aerosols from high latitudes towards the Equator, as might happen if pollution shifts from Europe to southeast Asia, has little effect on clear-sky radiative forcing. Shorter slant paths and smaller upscatter fractions near the Equator compensate for more total sunlight there. Overall, there has been an almost exact cancellation in the clear-sky radiative forcing from aerosol increases and decreases in different parts of the world, whereas MISR should have been able to easily detect a change of 0.1 W m−2 per decade due to changing patterns. Long-term changes in global mean aerosol optical depth or indirect aerosol forcing of clouds are difficult to measure from satellites. However, the satellite data show that the regional redistribution of aerosols had little direct net effect on global average clear-sky radiative forcing from 2000 to 2012.

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Figure 1: The calculated short-wave top-of-atmosphere radiative change per unit optical depth for optically thin (<0.25) aerosols in clear-sky conditions.
Figure 2: The pattern of aerosol optical depth compared with its clear-sky radiative efficiency.
Figure 3: The average trend in optical depth as a function of clear-sky radiative efficiency.
Figure 4: The average trend in clear-sky radiative forcing as a function of cloud fraction at that location and season.

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References

  1. Clough, S. A. et al. Atmospheric radiative transfer modeling: a summary of the AER codes, Short Communication. J. Quantum. Spectrosc. Radiat. Transf. 91, 233–244 (2005).

    Article  Google Scholar 

  2. Mishchenko, M. I. & Geogdzhayev, I. V. Satellite remote sensing reveals regional tropospheric aerosol trends. Opt. Express 15, 7423–7438 (2007).

    Article  Google Scholar 

  3. Zhao, T. X-P. et al. Study of long-term trend in aerosol optical thickness observed from operational AVHRR satellite instrument. J. Geophys. Res. 113, D07201 (2008).

    Google Scholar 

  4. Zhao, T. X-P., Heidinger, A. K. & Knapp, K. R. Long-term trends of zonally averaged aerosol optical thickness observed from operational satellite AVHRR instrument. Meterol. Appl. 18, 440–445 (2011).

    Article  Google Scholar 

  5. Deshler, T., Hervig, M. E., Hofnn, D. J., Rosen, J. M. & Liley, J. B. Thirty years of in situ stratospheric aerosol size distribution measurements from Laramie, Wyoming (41 N), using balloon-borne instruments. J. Geophys. Res. 108, 4167 (2003).

    Article  Google Scholar 

  6. Zhang, J. & Reid, J. S. A decadal regional and global trend analysis of the aerosol optical depth using a data-assimilation grade over-water MODIS and Level 2 MISR aerosol products. Atmos. Chem. Phys. 10, 10949–10963 (2010).

    Article  Google Scholar 

  7. Hsu, N. C. et al. Global and regional trends of aerosol optical depth over land and ocean using SeaWiFS measurements from 1997 to 2010. Atmos. Chem. Phys. 12, 8037–8053 (2012).

    Article  Google Scholar 

  8. Diner, D. J. et al. The value of multiangle measurements for retrieving structurally and radiatively consistent properties of clouds, aerosols, and surfaces. Remote Sens. Environ. 97, 495–518 (2005).

    Article  Google Scholar 

  9. Martonchik, J. V., Kahn, R. A. & Diner, D. J. in Satellite Aerosol Remote Sensing Over Land (eds Kokhanovsky, A. A. & de Leeuw, G.) 267–293 (Springer, 2009).

    Book  Google Scholar 

  10. Yu, H. et al. Direct radiative effect of aerosols as determined from a combination of MODIS retrievals and GOCART simulations. J. Geophys. Res. 109, D03206 (2004).

    Google Scholar 

  11. Zhou, M., Yu, H., Dickinson, R. E., Dubovik, O. & Holben, B. N. A normalized description of the direct effect of key aerosol types on solar radiation as estimated from Aerosol Robotic Network aerosols and Moderate Resolution Imaging Spectroradiometer albedos. J. Geophys. Res. 110, D19202 (2005).

    Article  Google Scholar 

  12. McComiskey, A. et al. Direct aerosol forcing: Calculation from observables and sensitivities to inputs. J. Geophys. Res. 113, D09202 (2008).

    Article  Google Scholar 

  13. Chen, Y., Li, Q., Kahn, R. A., Randerson, J. T. & Diner, D. J. Quantifying aerosol direct radiative effect with Multiangle Imaging Spectroradiometer observations: Top-of-atmosphere albedo change by aerosols based on land surface types. J. Geophys. Res. 114, D02109 (2009).

    Google Scholar 

  14. Meija, A. d., Pozzera, A. & Lelieveld, J. Trend analysis in aerosol optical depths and pollutant emission estimates between 2000 and 2009. Atmos. Environ. 51, 75–85 (2012).

    Article  Google Scholar 

  15. Menzel, W. P. et al. MODIS global cloud-top pressure and amount estimation: Algorithm description and results. J. Appl. Meteorol. Clim. 47, 1175–1198 (2008).

    Article  Google Scholar 

  16. Li, Z. et al. Uncertainties in satellite remote sensing of aerosols and impact on monitoring its long-term trend: a review and perspective. Ann. Geophys. 27, 2755–2770 (2009).

    Article  Google Scholar 

  17. Kahn, R. A. et al. Multiangle Imaging SpectroRadiometer global aerosol product assessment by comparison with the Aerosol Robotic Network. J. Geophys. Res. 115, D23209 (2010).

    Article  Google Scholar 

  18. Kahn, R. A. Reducing the uncertainties in direct aerosol radiative forcing. Surv. Geophys. 33, 701–721 (2012).

    Article  Google Scholar 

  19. Granier, C. et al. Evolution of anthropogenic and biomass burning emissions of air pollutants at global and regional scales during the 1980–2010 period. Climatic Change 109, 163–190 (2011).

    Article  Google Scholar 

  20. Pozzoli, L. et al. Re-analysis of tropospheric sulfate aerosol and ozone for the period 1980–2005 using the aerosol-chemistry-climate model ECHAM5-HAMMOZ. Atmos. Chem. Phys. 11, 9563–9594 (2011).

    Article  Google Scholar 

  21. Bellouin, N. et al. Aerosol forcing in the Climate Model Intercomparison Project (CMIP5) simulations by HadGEM2—ES and the role of ammonium nitrate. J. Geophys. Res. 116, D20206 (2012).

    Article  Google Scholar 

  22. Sorooshian, A., Feingold, G., Lebsock, M. D., Jiang, H. & Stephens, G. L. On the precipitation susceptibility of clouds to aerosol perturbations. Geophys. Res. Lett. 36, L13803 (2009).

    Article  Google Scholar 

  23. Jin, Z., Charlock, T. P. Jr & Rutledge, W. L. S. A parameterization of ocean surface albedo. Geophys. Res. Lett. 31, L22301 (2004).

    Article  Google Scholar 

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Acknowledgements

This work was financially supported by NOAA base and climate-change funding. I thank R. Kahn, J. Daniel and A. McComiskey for helpful comments.

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Correspondence to D. M. Murphy.

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Murphy, D. Little net clear-sky radiative forcing from recent regional redistribution of aerosols. Nature Geosci 6, 258–262 (2013). https://doi.org/10.1038/ngeo1740

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