Similar subject 5 years ago Rap, A., Spracklen, D. V., Mercado, L., Reddington, C. L., Haywood, J. M., Ellis, R. J., ... & Butt, N. (2015). *Fires increase Amazon forest productivity through increases in diffuse radiation. <https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2015GL063719>* *Geophysical Research Letters*, *42*(11), 4654-4662.
Le jeu. 13 févr. 2020 à 16:27, Andrew Lockley <[email protected]> a écrit : > Poster's note: may help validate SRM crop models > https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JG005380 > > Wildfire‐smoke aerosols lead to increased light use efficiency among > agricultural and restored wetland land uses in California's Central Valley > Kyle S. Hemes Joseph Verfaillie Dennis D. Baldocchi > First published:26 January 2020 > https://doi.org/10.1029/2019JG005380 > This article has been accepted for publication and undergone full peer > review but has not been through the copyediting, typesetting, pagination > and proofreading process, which may lead to differences between this > version and the Version of Record. Please cite this article as doi: > 10.1029/2019JG005380 > About > > > Share on > Abstract > There are few observational studies measuring the ecosystem‐scale > productivity effects of changes in incident diffuse photosynthetically > active radiation (PARdiffuse), especially related to wildfire smoke. > Climate change‐induced increases to the duration and intensity of fire > conditions have made smoke a common occurrence across western North > America, with largely unquantified ecosystem feedbacks. Under equivalent > amounts of radiation, increased atmospheric particulate matter could lead > to a boost in productivity as scattering redistributes photons throughout > multi‐layer canopies. In this work, we leverage a meso‐network of eddy > covariance measurement sites across a unique array of managed and restored > C3 and C4 canopy types to understand how recent wildfire smoke affected > ecosystem productivity during the summer of 2018, an especially smoky year > in the agriculturally productive Central Valley. > > We find that PARdiffuse increased by more than a third compared to the > previous growing season, while total PAR (PARtotal) was only slightly > diminished. These conditions caused nearly a doubling of light use > efficiency over the range of diffuse fraction observed, with the highest > sensitivity to diffuse fraction exhibited by corn and alfalfa crops. We > utilized an empirical model to assess the tradeoff between enhanced diffuse > fraction and reduced PARtotal. Under mean radiation conditions, daily > integrated gross ecosystem productivity increased by 1.2‐4.1% compared to > the previous growing season. Finally, we explore the potential negative > effect of heightened ozone, a co‐pollutant often associated with wildfire. > In addition to the effects of wildfire smoke, the results of this natural > experiment can help validate future predictions of aerosol‐productivity > feedbacks. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/geoengineering/CAJ3C-04qnFm9%3DzQtb8c3pGCsVWiY7OA_BupoeFqvEFCPOde7EA%40mail.gmail.com > <https://groups.google.com/d/msgid/geoengineering/CAJ3C-04qnFm9%3DzQtb8c3pGCsVWiY7OA_BupoeFqvEFCPOde7EA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHodn9_4jUFYkQZC_kMjvkcN0THeJOEz9u4m52Rv6MVB_YHEqw%40mail.gmail.com.
