isoprene

The inventory uses meteorological analyses from ECMWF between 1995 and 2006 (Muller et al., 2008). The 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

The monthly averaged diurnal cycle of the emissions (24 times per day, from 00h30 to 23h30) for 2001 is provided:
isop_flux_diurn_2001.nc (298.6 Mb)

The seasonal evolution of the daily averaged isoprene emissions is illustrated on this animation (click on image).

The diurnal cycle of the emissions is illustrated on the animation below (click on image):

Updated version (June 2010) of the MEGAN-ECMWF inventory 1995-2009

Based on ERA-Interim meteorological fields over the period from 1995 to 2009, an updated global isoprene emission inventory of Muller et al. (2008) has been constructed, at a resolution of 0.5°. The 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

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

2) MEGAN-ECMWF-v2 (with updates in tropical forest basal emission rates, land use, and solar radiation) Isoprene emission inventory 1979-2012

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.

Below, we provide a historical global dataset from 1979 to 2012. 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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The monthly averaged diurnal cycle of the emissions (24 times per day, from 00h30 to 23h30) for 2001 is provided here

3) Top-down isoprene emission estimates, 2007-2012 - link to GlobEmission project

Using global satellite columns of HCHO retrieved from the GOME-2/MetOp-A sensor (De Smedt et al. 2012) over 2007-2012 as constraints in the IMAGESv2 chemistry-transport model (cf. Stavrakou et al. 2012, 2013 for details on the model), we derive satellite-based estimates of isoprene on a monthly basis. These emissions are available via the GlobEmission ESA project website on 0.5° resolution. They can also be downloaded below.

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For questions on the datasets or problems please contact :

Dr. T. Stavrakou (This email address is being protected from spambots. You need JavaScript enabled to view it.), Belgian Institute for Space Aeronomy, Avenue Circulaire 3, B-1180, Brussels, Belgium, Tel: +32-2-3736766, Fax : +32-2-3748423

References

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. [Abstract] [pdf] [Supplement] [Interactive Discussion]

Stavrakou, T., J.-F. Müller, J. Peeters, A. Razavi, L. Clarisse, C. Clerbaux, P.-F. Coheur, D. Hurtmans, M. De Mazière, C. Vigouroux, N. M. Deutscher, D. W. T. Griffith, N. Jones, C. Paton-Walsh, Satellite evidence for a large source of formic acid from boreal and tropical forests, Nature Geosci., 5, 26-30, doi:10.1038/ngeo1354, 2012. [pdf] [Supplement]

De Smedt, I., M. Van Roozendael, T. Stavrakou, J.-F. Müller, C. Lerot, N. Theys, P. Valks, N. Hao, and R. van der A, Improved retrieval of global tropospheric formaldehyde columns from GOME-2/MetOp-A addressing noise reduction and instrumental degradation issues, Atmos. Meas. Tech., 5,  2933-2949, 2012. [Abstract] [pdf]

Müller, J.-F.,T Stavrakou, S. Wallens, I. De Smedt, M. Van Roozendael, M. Potosnak, J. Rinne, B. Munger, A. Goldstein, and A. Guenther, Global isoprene emissions estimated using MEGAN, ECMWF analyses and a detailed canopy environment model, Atmos. Chem. Phys., 8, 1329-1341, 2008. [Full article]

Guenther, A., T. Karl, P. Harley, C. Wiedinmeyer, P.I. Palmer, and C. Geron, Estimates of global terrestrial isoprene emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature), Atmos. Chem. Phys., 6, 3181-3210, 2006 [Full article]