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Impact of Soil Moisture on Near-Surface Atmospheric Layers: Insights from the COSMO Workshop

This study, presented at the COSMO workshop in March 2005, explores the impact of soil moisture on near-surface atmospheric layers. Focused on the DWD integration area in Lindenberg, it evaluates soil moisture validation (0-10 cm) using the LM model and TERRA module. Recent findings reveal that the LM-module satisfactorily simulates soil moisture across the annual cycle when driven by measurements. Recommendations include extending validations to deeper soil layers and revising soil type maps based on recent data. The study also emphasizes the use of near-surface time-height cross-sections for monitoring boundary layer phenomena.

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Impact of Soil Moisture on Near-Surface Atmospheric Layers: Insights from the COSMO Workshop

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  1. Impact of soil moisture on near-surface atmospheric layers Gerd Vogel, Felix Ament*, Ursula Schubert DWD, FE14 Potsdam *University Bonn COSMO-workshop March 2005 FE 14

  2. Selected point of soil moisture validation within the LM integration area (DWD) Lindenberg (DWD)

  3. Soil moisture (0-10cm)

  4. Outlook Soil moisture (0-10cm) at model start (0 UTC)

  5. 2-layer module TERRA precipitation sums

  6. sand sandy loam loam

  7. Soil moisture (0-10cm)

  8. Specific humidity May 26, 2003 Soil moisture (0-10cm) Operat LM: 20Vol% LM (Ament): 8Vol% Measurement: 6.5Vol%

  9. Lindenberg May 30, 2003 Soil moisture LM 16 Vol% meas 6 Vol%

  10. Lindenberg May 16, 2004 Soil moisture LM 23Vol% meas 12Vol%

  11. Lindenberg May 30, 2004 Soil moisture) LM 19 Vol% meas 8 Vol%

  12. Specific humidity May 26, 2003 Lindenberg Vertical latent heat flux Potential temperature

  13. Conclusions Recent accuracy checks indicate that the LM-module TERRA satisfacto-rily simulates the soil moisture in large parts of the annual cycle when being exclusively driven by measurements. In order to finally assess the model’s ability for the given task the present stand-alone validations should also be extended to deeper soil layers. Besides the real data forcing the soil and external parameters have like-wise to be adapted to the real conditions if possible. Consequently, a revision of the widely used map of soil types in the LM-integration area is recommended by using all recent information available nowadays. For local case studies data sets of near-surface time-height cross sections of temperature, humidity (wind) are available in hourly time resolution. They are appropriate to sensitivity studies of turbulent processes, but also to watch other relevant boundary layer phenomena (e.g. fog, inversions).

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