Land-Atmosphere Interactions

A related matter to atmospheric convection is the influence of the land surface in promoting or suppressing development.  This becomes particularly important again when considering that models oftentimes cannot resolve the mirco- and meso-scale processes necessary to fully capture convection.  My interests lie in this realm, and attempt to quantify and eventually parameterize these land-atmosphere interactions.  In particular, I would like to answer questions like:  When does the land surface reinforce or counteract the atmospheric state?  When and where are positive or negative feedbacks present?

Understanding and addressing these questions is crucial to the predictability of drought onset and duration, and for promoting best land management practices in the agricultural and other commercial interests. There are also large implications related to understanding land-atmosphere feedbacks from a climate perspective. The question of which feedbacks (e.g., positive or negative) tend to dominate and how these feedbacks may change under certain scenarios has wide reaching implications in terms of long-term investment strategies and for public policy.  It is my goal to make the answers to these questions clear when possible, and make the best information broadly accessible and readily deployable. One such recent advancement towards this end is the Coupling Metrics Toolkit (CoMeT), which is a continuously growing code base used to calculate the latest and most useful land-atmosphere coupling metrics.

Related Publications

  • Tawfik, A., P.A. Dirmeyer, J.A. Santanello Jr., The Heated Condensation Framework. Part II:  Climatological behavior of convective initiation and land-atmosphere coupling over the Continental United States, Journal of Hydromet. doi:10.1175/JHM-D-14-0117.1

  • Tawfik, A.B., and P.A. Dirmeyer (2014), A process-based framework for quantifying the atmospheric preconditioning of surface-triggered convection, Geophys. Res. Lett., 41, doi:10.1002/2013GL057984

  • Tawfik, A. and A.L. Steiner (2013) A proposed physical mechanism for ozone-meteorology correlations using land-atmosphere coupling regimes.Atmospheric Environment, doi: 10.1016/j.atmosenv.2013.03.002

  • Tawfik A., R. Stockli, A. Goldstein, S. Pressley, and A.L. Steiner, (2012), Quantifying the contribution of environmental variables to isoprene flux interannual variability, Atmospheric Environment, doi: 10.1016/j.atmosenv.2012.02.01

  • Tawfik A., and A.L. Steiner (2011), The role of soil ice in land-atmosphere coupling over the United States: A soil moisture–precipitation winter feedback mechanism, J. Geophys. Res.116, D02113, doi: 10.1029/2010JD014333.

  • Chen, L., Dirmeyer, P.A., Tawfik, A., and Lawrence D.M. (2016), Sensitivity of Land Cover-Precipitation Feedback to Convective Triggering (In-Review)

  • Burakowski, E., Tawfik, A., Ouimette, A., Lepine, L., Zayzycki, C., Novick, K., and Ollinger, S. (2016), Simulating surface energy fluxes using uncoupled and coupled Earth System Models and eddy covariance tower clusters, Journal of Hydromet., (In-Review)

  • Smith, N.G., Lombardozzi, D., Tawfik, A., and Bonan, G., Dukes, J.S. (2016), Biophysical consequences of photosynthetic temperature acclimation for climate, JAMES, (Accepted)

  • Notaro, M., Chen, G., Yu Y., Wang F., and Tawfik, A. (2016), Regional Climate Modeling of Vegetation Feedbacks on the Asian-Australian Monsoon System, Journal of Climate, (Accepted)

  • Betts, A.K., Tawfik, A., and Desjardins, R. (2016), Revisiting hydrometeorology using cloud and climate observations, Journal of Hydromet., (Accepted)

  • Betts, A.K., R. Desjardins A.C.M. Beljaars and A.Tawfik, Observational study of land-surface-cloud-atmosphere coupling on daily timescales (2015), Frontiers in Earth Science, Front. Earth Sci. 3:13. doi: 10.3389/feart.2015.00013

  • Lombardozzi, D., Zeppel, M.J.B., Fisher, R., and Tawfik, A. (2016), Incorporating observed nighttime conductance alters global hydrology and carbon budgets in CLM4.5, Geo. Mod. Dev. Discuss., 8, 10339-10363, doi: 10.5194/gmdd-8-10339-2015

  • Betts, A.K. and A.Tawfik (2016), Annual Climatology of the Diurnal Cycle on the Canadian Prairies, Front. Earth Sci. 4:1. doi: 10.3389/feart.2016.00001.