Naslov
Global Scale Assessment of Climate Sensitivity in Relation to Carbon Dioxide Concentrations

Autori
Bjornham, Oscar ; Constantine, Paul ; Kakarigi, Robert ; Lindbo, Dag ; Rubensson, Emanuel ; Stockli, Michael ; Zahedi, Sara

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Multiscale Modeling and Simulation in Science. Global Scale Assessment of Climate Sensitivity in Relation to Carbon Dioxide Concentrations - Lecture Notes in Computational Science and Engineering / Kornich, Heiner ; Kallen, Erland - Stockholm : Stockholm University, 2007, 1-19

Skup
Summer School on Multiscale Modeling and Simulation in Science

Mjesto i datum
Stockholm, Švedska, 04.06.2007. - 18.06.2007

Vrsta sudjelovanja
Radionica

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
climate sensitivity, climate model, co2, planet simulator

Sažetak
The focus of the presented group project was to investigate the sensitivity of the climate system to external forcing. The climate system encompasses a wide range of temporal and spatial scales, ranging from fractions of a second and molecular length scales to thousands of years and global extents. This includes the deep circulation of the ocean as well as the micro physics of cloud droplets. The interactions between these scales contribute to the complexity of the climate system. This project assessed the climate sensitivity to prescribed changes in atmospheric carbon dioxide (CO2) concentration, with a specific focus on temperature response and smaller-scale feedback processes, such as clouds or ice cover, simulated numerically. Future CO2 concentration was described as β-distributed between 200 and 1000 ppm, considering the uncertainty of future economic scenarios and anthropogenically induced climate change. The respective temperature response was treated as a random variable. The PhD students conducted nine climate scenarios with varying CO2 concentrations, ranging from half of today's concentration to 4.5 times it. The climate model was integrated for 50 years to achieve a stable climate state, and the last 20 years were analysed to determine the average temperature increase. The largest variances in temperature response were observed in high latitudes, likely due to the impact of sea-ice cover. Overall, the model simulations highlight the significant influence of sea-ice on the simulated climate. This report was written during the Summer School on Multiscale Modeling and Simulation in Science, held in Boson, Lidingo (near Stockholm), Sweden in June 2007. The first week of the Summer School was dedicated to lectures and workshops for PhD students on multiscale methods. During the second week, PhD students worked in groups on climate modeling projects, and each group prepared a report. The model used in the presented studies is the Planet Simulator, developed by the Department of Meteorology at the University of Hamburg.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika, Interdisciplinarne prirodne znanosti, Računarstvo

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