MEGAN-MOHYCAN : with updates in tropical forest basal emission rates, land use, and solar radiation Isoprene emission inventory 1979-2014

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Below, we provide a historical global dataset from 1979 to 2014. Monthly averaged emissions (in mg isoprene /m2 /hr) are available in NetCDF format:
720 longitudes from 0.25 to 359.75° W, 360 latitudes from 89.75° N to 89.75° S, 12 months

                           

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2014

                                                                                                                               

 

The monthly averaged diurnal cycle of the emissions for 2001 is available here (24 times per day, from 00h30 to 23h30)

 

About the dataset

Based on ERA-Interim meteorological fields over the period from 1979 to 2012, we improved upon the MEGAN-ECMWF inventory by incorporating (i) land use changes between 1979 and 2007 from Ramankutty and Foley (1999), (ii) reduced isoprene rates from tropical forests adopted from Langford et al. (2010) in the domain defined by 9.75S-54.75N, 60.25-149.75E, (iii) oil palm plantations maps (Miettinen et al. 2012) and modified MEGAN algorithm adopted from Misztal et al. (2011), (iv) solar radiation changes based on ground-based surface data for China, India, and Japan from 1979 to 2005. The resulting bottom-up inventory limited to the Asian domain defined above is fully documented in Stavrakou et al. (2013). For the rest of the world only land-use changes have been taken into account from Ramankutty and Foley (1999), between 1979 and 2007. Beyond this year, the land use changes are set to their 2007 values. The same is true for solar radiation changes in Asia after 2005 - they are set to their 2005 values.The dataset is described in full detail in Stavrakou et al. (2014)

 

Additional information

In the figure below the annual isoprene emissions ( in Tg isop. per year) are illustrated for the regions defined in the table below.

trends

  Region Coordinates
(lat - lon)
   
  N. America 13 75 -170 -40

http://tropo.aeronomie.be/GE_regions.png

  S. America -60 13 -90 -35
  Europe 37 75 -15 50
  N. Africa 15 37 -20 65
  Eq. Africa -15 15 -20 55
  S. Africa -35 -15 -20 55
  Russia 37 75 50 179
  S.E. Asia -10 37 65 170
  Australia -50 -10 110 179
  Global -90 90 -180 180

 

 

References

Langford, B., Misztal, P. K., Nemitz, E., Davison, B., Helfter, C., Pugh, T. A. M., MacKenzie, A. R., Lim, S. F., and Hewitt, C. N.:Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest, Atmos. Chem. Phys., 10,8391–8412,  2010 [pdf]

Miettinen, J., Hooijer, A., Tollenaar, D., Page, S., Malins, C., Vernimmen, R., Shi, C., and Liew, S. C.: Historical Analysis and projection of oil palm plantation expansion on peatland in Southeast Asia, White Paper 17, The International Council on Clean Transportation, www.theicct.org , February 2012

Misztal, P. K., Nemitz, E., Langford, B., Di Marco, C. F., Phillips, G. J., Hewitt, C. N., MacKenzie, A. R., Owen, S. M., Fowler, D., Heal, M. R., and Cape, J. N.: Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia, Atmos. Chem. Phys., 11, 8995–9017, 2011 [pdf]

Ramankutty, N. and Foley, J. A.: Estimating historical changes in global land cover: croplands from 1700 to 1992, Global Biogeochem. Cy., 13, 997–1027, 1999. [pdf]

Stavrakou, T., J.-F. Müller, M. Bauwens, I. De Smedt, M. Van Roozendael, A. Guenther, M. Wild, and X. Xia, Isoprene emissions over Asia 1979-2012 : impact of climate and land use changes, Atmos. Chem. Phys., 14, 4587-4605, 2014 [pdf] [Interactive Discussion]

Stavrakou, T., J.-F. Müller, K. F. Boersma, R.J. van der A, J. Kurokawa, T. Ohara, and Q. Zhang, Key chemical NOx sink uncertainties and how they influence top-down emissions of nitrogen oxides, Atmos. Chem. Phys. 13, 9057-9082, 2013 [pdf] [Supplement] [Interactive Discussion]