Skip to main content

Free Content The impact of soil moisture variability on seasonal convective precipitation simulations. Part I: validation, feedbacks, and realistic initialisation

Download Article:
 Download
(PDF 1,768.9 kb)
 

Abstract:

To assess how well and with what uncertainties the components of the regional water cycle, such as soil moisture, evapotranspiration, and precipitation, can be modelled especially in complex orographic areas and to investigate possible relationships among these parameters, numerical experiments were performed using the COSMO-CLM model in climate mode and observations from the field campaign 'Convective and Orographically-induced Precipitation Study' (COPS), including a unique soil moisture monitoring network. Additionally, the soil moisture observations were utilised for the initialisation of model simulations to investigate the impact on the precipitation field. The simulated summer season showed a clear relation of the different parameters of the process chain between soil moisture and precipitation. Deficiencies in the external model data, such as the soil type inventory, were pointed out. The simulated precipitation field showed an overestimation mainly in the valley and at lower altitudes. However, the analysis of the soil moisture distribution revealed a major underestimation in the valley and windward Black Forest areas, i.e. (a) too much rain was converted into runoff and (b) the forcing data were too dry. Differences in the surface fluxes could be attributed to a wrong soil type and an inappropriate land use type. The atmospheric water vapour content was overestimated in the valley and at windward sites, but underestimated in the high orographic areas, probably because thermally induced circulation systems were not represented well by the model. These model discrepancies may partly explain the biases observed in the precipitation field. Using COPS soil moisture observations for a model initialisation, an impact on precipitation was observed until the first strong precipitation event occurred.

Keywords: COMPLEX TERRAIN; CONVECTION; COPS; SOIL MOISTURE; SOIL MOISTURE-PRECIPITATION FEEDBACK

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2013/0403

Publication date: August 1, 2013

More about this publication?
  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • ingentaconnect is not responsible for the content or availability of external websites
schweiz/mz/2013/00000022/00000004/art00009
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more