Sensitivities of Lagrangian modelling of mid-latitude cirrus clouds to trajectory data quality

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • E Kienast-Sjogren
  • AK Miltenberger
  • BP Luo
  • T Peter
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000357978300017&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-15-7429-2015
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: CM8UT
ISSN
1680-7316
Ausgabe der Veröffentlichung
13
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
7429 - 7447
Datum der Veröffentlichung
2015
Status
Published
Titel
Sensitivities of Lagrangian modelling of mid-latitude cirrus clouds to trajectory data quality
Sub types
  • Article
Ausgabe der Zeitschrift
15

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. Simulations of cirrus are subject to uncertainties in model physics and meteorological input data. Here we model cirrus clouds along air mass trajectories, whose extinction has been measured with an elastic backscatter lidar at Jungfraujoch research station in the Swiss Alps, with a microphysical stacked box model. The sensitivities of these simulations to input data uncertainties (trajectory resolution, unresolved vertical velocities, ice nuclei number density and upstream specific humidity) are investigated. Variations in the temporal resolution of the wind field data (COSMO-Model at 2.2 km resolution) between 20 s and 1 h have only a marginal impact on the trajectory path, while the representation of the vertical velocity variability and therefore the cooling rate distribution are significantly affected. A temporal resolution better than 5 min must be chosen in order to resolve cooling rates required to explain the measured extinction. A further increase in the temporal resolution improves the simulation results slightly. The close match between the modelled and observed extinction profile for high-resolution trajectories suggests that the cooling rate spectra calculated by the COSMO-2 model suffice on the selected day. The modelled cooling rate spectra are, however, characterized by significantly lower vertical velocity amplitudes than those found previously in some aircraft campaigns (SUCCESS, MACPEX). A climatological analysis of the vertical velocity amplitude in the Alpine region based on COSMO-2 analyses and balloon sounding data suggests large day-to-day variability in small-scale temperature fluctuations. This demonstrates the necessity to apply numerical weather prediction models with high spatial and temporal resolutions in cirrus modelling, whereas using climatological means for the amplitude of the unresolved air motions does generally not suffice. The box model simulations further suggest that uncertainties in the upstream specific humidity (± 10 % of the model prediction) and in the ice nuclei number density (0–100 L−1) are more important for the modelled cirrus cloud than the unresolved temperature fluctuations if temporally highly resolved trajectories are used. For the presented case the simulations are incompatible with ice nuclei number densities larger than 20 L−1 and insensitive to variations below this value. </jats:p>
Autoren
  • E Kienast-Sjögren
  • AK Miltenberger
  • BP Luo
  • T Peter
DOI
10.5194/acp-15-7429-2015
eISSN
1680-7324
Ausgabe der Veröffentlichung
13
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2015
Paginierung
7429 - 7447
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-15-7429-2015
Datum der Datenerfassung
2021
Titel
Sensitivities of Lagrangian modelling of mid-latitude cirrus clouds to trajectory data quality
Ausgabe der Zeitschrift
15

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