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We present measurements of water uptake and release by single micrometre-sized aqueous sucrose particles. The experiments were performed in an electrodynamic balance where the particles can be stored contact-free in a temperature and humidity controlled chamber for several days. Aqueous sucrose particles react to a change in ambient humidity by(More)
Space borne infrared limb emission measurements by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) reveal the formation of a belt of polar stratospheric clouds (PSCs) of nitric acid trihydrate (NAT) particles over Antarctica in mid-June 2003. By mesoscale microphysical simulations we show that this sudden onset of NAT PSCs was caused(More)
[1] We use radiative transfer calculations to quantify vertical mass transport in the equatorial upper troposphere (UT) and lower stratosphere (LS), employing high resolution sonde measurements of temperature, ozone and water vapor at seven equatorial locations (10 S–10 N). The influence of clouds is examined using data from the International Satellite(More)
Detailed modeling of mountain wave PSCs S. Fueglistaler, S. Buss, B. P. Luo, H. Wernli, H. Flentje, C. A. Hostetler, L. R. Poole, K. S. Carslaw, and Th. Peter Atmospheric and Climate Science, ETH Zürich, Switzerland DLR Oberpfaffenhofen, 82230 Wessling, Germany NASA Langley Research Center, Hampton, VA, USA School of the Environment, Univ. of Leeds, Leeds,(More)
Although it is well known that air enters the stratosphere preferentially through upwelling in the tropics, the exact mechanisms of troposphere-to-stratosphere transport (TST) are still unknown. Previously proposed mechanisms have been found either to be too slow (e.g., clear sky upwelling) to provide agreement with in situ tracer measurements, or to be(More)
Polar stratospheric clouds (PSCs) of type 1a or 1aenh containing high number densities of nitric acid trihydrate (NAT) particles, can act as mother clouds for extremely large NAT particles, termed NAT-rocks, provided the air below the clouds is supersaturated with respect to NAT. Individual NAT particles at the cloud base fall into undepleted gas phase and(More)
We have analyzed mid-infrared limb-emission measurements of polar stratospheric clouds (PSCs) by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) during the Antarctic winter 2003 with respect to PSC composition. Coincident Lidar observations from McMurdo were used for comparison with PSC types 1a, 1b and 2. Application of new refractive(More)
We describe version 2.0 of the chemistry-climate model (CCM) SOCOL. The new version includes fundamental changes of the transport scheme such as transporting all chemical species of the model individually and applying a family-based correction scheme for mass conservation for species of the nitrogen, chlorine and bromine 5 groups, a revised transport scheme(More)
Nitric acid trihydrate (NAT) formation at low NAT supersaturations C. Voigt, H. Schlager, B. P. Luo, A. Dörnbrack, A. Roiger, P. Stock, J. Curtius, H. Vössing, S. Borrmann, S. Davies, P. Konopka, C. Schiller, G. Shur, and T. Peter Institut für Physik der Atmosphäre (IPA), DLR Oberpfaffenhofen, D-82234 Wessling, Germany Institut für Atmosphäre und Klima, ETH(More)