Global Energy Balance ; Radiation Budget; Climate Change; Solar radiation; Global Dimming; Surface Albedo
Hakuba Maria Z. Folini Doris Wild Martin (2016), On the Zonal Near-Constancy of Fractional Sola Absorption in the Atmosphere, in Journal of Climate
, 29(9), 3423-3440.
Hakuba M. Z., Folini D., Schaepman-Strub G., Wild M. (2014), Solar absorption over Europe from collocated surface and satellite observations, in JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
, 119(6), 3420-3437.
Hakuba M. Z., Folini D., Sanchez-Lorenzo A., Wild M. (2014), Spatial representativeness of ground-based solar radiation measurements-Extension to the full Meteosat disk, in JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
, 119(20), 11760-11771.
M. Z. Hakuba D. Folini A. Sanchez-Lorenzo and M. Wild (2013), Spatial representativeness of ground-based solar radiation measurements, in Journal of Geophysical Research
, 118, 8585-8597.
Hakuba Maria Z., Sanchez-Lorenzo Arturo, Folini Doris, Wild Martin (2013), Testing the Homogeneity of Short-Term Surface Solar Radiation Series in Europe, in RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN (IRS2012)
, 1531, 700-703.
The genesis and evolution of Earth’s climate is largely regulated by the Global Energy Balance. Anthropogenic climate change is, from a physical point of view, first of all a perturbation of the energy balance of the globe, through the modification of the atmospheric composition of greenhouse gases and aerosols. Changes in the global energy balance affect not only the thermal conditions on the planet, but also various other climate elements, such as the components of the hydrological cycle, snow cover and glaciers, plant productivity and terrestrial carbon uptake. Despite the central importance of the global energy balance for the climate system and climate change, substantial uncertainties still exist in the quantification of the different components of the energy balance and their decadal variations. The long term research goal of the applicant aims at an improved understanding of the mean state and the spatio-temporal variations of the different components of the energy balance of the globe. While our knowledge on the energy exchange between Sun, Earth and space has recently been improved through new satellite programs, the distribution of radiative energy within the climate system, which cannot directly be measured by satellites, is still afflicted with large uncertainties. The proposed PhD project aims at reducing the uncertainties in the absorption of solar radiation within the climate system, a crucial aspect of the global energy balance, through an optimal usage of the information contained in worldwide surface radiation measurements in combination with satellite products. This project makes extensive use of the comprehensive dataset of surface radiation measurements compiled by the applicants’ group in the Global Energy Balance Archive (GEBA), as well as of the Baseline Surface Radiation Network (BSRN). These data will be combined with recent satellite data (in particular CERES and MODIS) to quantify the top of the atmosphere fluxes and surface albedo. A number of long-standing and pressing issues with respect to surface radiation data are addressed in this project. This includes quality assessment of the stations collected in GEBA, homogenization of time series, the assessment of station representativeness, as well as best estimates of the surface albedo to infer absorbed solar fluxes from the measured downwelling fluxes. The aim of these investigations is to establish the best possible information contained in the surface radiation observations on the absorption of solar radiation at the Earth surface. In combination with collocated satellite data of top of atmosphere fluxes, this will provide a unique dataset of key reference (anchor) stations to investigate the disposition and variation of solar radiation in the climate system, as well as its representation in climate models and satellite-derived products. Such investigations are urgently needed for a better understanding and representation of the Global Energy Balance in the framework of the 5th IPCC assessment report.