Impact of soil moisture on near-surface atmospheric layers

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Presentation transcript:

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

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

Soil moisture (0-10cm)

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

2-layer module TERRA precipitation sums

sand sandy loam loam

Soil moisture (0-10cm)

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

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

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

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

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

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).