Alan works on the development and improvement of the merged gauge-radar rainfall product.
Areas of expertise:
Alan is investigating potential uses of high urban density measurements and third party data.
Alan has investigated uncertainty in future carbon cycle projections obtained from a number of different models and future emission scenarios. The total variance in 21St century CMIP5 atmosphere to land/ocean surface carbon fluxes was decomposed into scenario uncertainty, model uncertainty, internal variability and model:scenario interaction using an analysis of variance (A NOVA) framework. This work will be published shortly.
Alan has developed a scheme to merge rain-rate data from both the radar and rain gauge networks to produce a best possible estimate of rainfall in the UK.
Alan joined the Met Office in 2011 after completing a PhD at the University of Leicester "Investigating land-air carbon fluxes using a Lagrangian model and satellite retrieved carbon dioxide" Alan Hewitt - Ph.D. Thesis.
Hewitt et al, 2005, Deuterated water: partition functions and equilibrium constants, MNRAS, 365, 1123-1126. DOI: 10.1111/j.1365-2966.2004.08559.x
M. P. Barkley, P. S. Monks, A. J. Hewitt, T. Machida, A. Desai, N. Vinnichenko, T. Nakazawa, M. Yu Arshinov, N. Fedoseev, T. Watai, 2007, Assessing the near surface sensitivity of SCIAMACHY atmospheric CO2 retrieved using (FSI) WFM-DOAS, Atmos. Chem. Phys., 7, 3597-3619. DOI:10.5194/acp-7-3597-2007
Last updated: 8 April 2014