Description: Das Projekt "The stratosphere: Radiation, dynamics, and trace gases" wird/wurde gefördert durch: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung. Es wird/wurde ausgeführt durch: Princeton University, Program in Atmospheric and Oceanic Sciences.Stratospheric trace gas distributions are crucial to Earths radiation budget. While carbon dioxide, for example, is long lived and well mixed, other gases, such as ozone and water vapor, are modified through physical and chemical processes while in the atmosphere. Here, we focus on the stratosphere which is (photo-)chemically active, and which interacts with the underlying troposphere dynamically, radiatively, and through exchange of trace gases. The result is an intrinsically nonlinear environ- ment, where it is difficult to understand cause-and-effect relationships between dif- ferent variables. In both observations and comprehensive numerical models, it is challenging to disentangle effects of single parameters on the general state of the stratosphere. This project proposes to perform a cause-and-effect study with an ide- alized general circulation model. With this model, we can disentangle effects of ra- diation, dynamics, and tracer transport, and find corresponding sensitivities of the stratospheric equilibrium and climatology. For instance, by varying the strength of the meridional overturning circulation in the stratosphere and keeping the radiative equilibrium constant, we can study the effects of the global residual circulation on temperatures, winds, and tracer distributions. Alternatively, perturbations to the ra- diative equilibrium, e.g. simulating the creation and disappearance of the ozone hole, allow to study the leading-order impacts on the dynamical state of the atmosphere and tracer distributions. The interplay between radiation, dynamics, and tracer trans- port comprises still unanswered questions crucial for future predictions of the state of the atmosphere and interpretation of the observational record, as global circulation, radiative equilibrium, and gas tracer distributions will evolve under climate change.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Ozon ? Spurengas ? Tracer ? Wasserdampf ? Wind ? Globales Klimamodell ? Kohlendioxid ? Software ? Temperatur ? Prognose ? Hafen ? Atmosphärenmodell ? Chemisches Verfahren ? Gasaustausch ? Jahreszeit ? Kausalzusammenhang ? Simulation ? Stratosphäre ? Studie ? Tropengebiet ? Tropopause ? Troposphäre ? Wirkungsanalyse ? Polargebiet ? Modellierung ? Strahlungshaushalt ? Rückstand ? Klimawandel ? Atmosphäre ? Globale Aspekte ? Chemische Reaktion ? Atmosphärische Zirkulation ? Atmosphärischer Prozess ? Chemischer Stoff ? Strahlung ? seasonal cycle ? Atmosphärendynamik ?
Region: New Jersey
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2013-04-01 - 2014-03-31
Accessed 1 times.