Ulrika Willén
Climate researcher, Ph.lic.
Ulrika Willén
The changing nature of Earth's reflected sunlight
Graeme L. Stephens, Maria Z. Hakuba, Seiji Kato, Andrew Gettleman, Jean-Louis Dufresne, Timothy Andrews, Jason N. S. Cole, Ulrika Willén, Thorsten Mauritsen
In: Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, Vol. 478, No. 2263
2022
The EC-Earth3 Earth system model for the Coupled Model Intercomparison Project 6
Ralf Doescher, Mario Acosta, Andrea Alessandri, Peter Anthoni, Thomas Arsouze, Tommi Bergman, Raffaele Bernardello, Souhail Boussetta, Louis-Philippe Caron, Glenn Carver, Miguel Castrillo, Franco Catalano, Ivana Cvijanovic, Paolo Davini, Evelien Dekker, Francisco J. Doblas-Reyes, David Docquier, Pablo Echevarria, Uwe Fladrich, Ramon Fuentes Franco, Matthias Groger, Jost, V Hardenberg, Jenny Hieronymus, Pasha Karami, Jukka-Pekka Keskinen, Torben Koenigk, Risto Makkonen, Francois Massonnet, Martin Menegoz, Paul A. Miller, Eduardo Moreno-Chamarro, Lars Nieradzik, Twan van Noije, Paul Nolan, Declan O'Donnell, Pirkka Ollinaho, Gijs van den Oord, Pablo Ortega, Oriol Tinto Prims, Arthur Ramos, Thomas Reerink, Clement Rousset, Yohan Ruprich-Robert, Philippe Le Sager, Torben Schmith, Roland Schrodner, Federico Serva, Valentina Sicardi, Marianne Sloth Madsen, Benjamin Smith, Tian Tian, Etienne Tourigny, Petteri Uotila, Martin Vancoppenolle, Shiyu Wang, David Warlind, Ulrika Willen, Klaus Wyser, Shuting Yang, Xavier Yepes-Arbos, Qiong Zhang
New Generation of Climate Models Track Recent Unprecedented Changes in Earth's Radiation Budget Observed by CERES
Norman G. Loeb, Hailan Wang, Richard P. Allan, Timothy Andrews, Kyle Armour, Jason N. S. Cole, Jean-Louis Dufresne, Piers Forster, Andrew Gettelman, Huan Guo, Thorsten Mauritsen, Yi Ming, David Paynter, Cristian Proistosescu, Malte F. Stuecker, Ulrika Willén, Klaus Wyser
Abstract
We compare top-of-atmosphere (TOA) radiative fluxes observed by the Clouds and the Earth's Radiant Energy System (CERES) and simulated by seven general circulation models forced with observed sea-surface temperature (SST) and sea-ice boundary conditions. In response to increased SSTs along the equator and over the eastern Pacific (EP) following the so-called global warming "hiatus" of the early 21st century, simulated TOA flux changes are remarkably similar to CERES. Both show outgoing shortwave and longwave TOA flux changes that largely cancel over the west and central tropical Pacific, and large reductions in shortwave flux for EP low-cloud regions. A model's ability to represent changes in the relationship between global mean net TOA flux and surface temperature depends upon how well it represents shortwave flux changes in low-cloud regions, with most showing too little sensitivity to EP SST changes, suggesting a "pattern effect" that may be too weak compared to observations.
