Florian Meier, Peter Knippertz Johannes Gutenberg-University Mainz
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1 Sensitivity experiments with the COSMO-Model - the influence of upstream latent heating and wave amplification on a heavy precipitation event over West Africa Florian Meier, Peter Knippertz Johannes Gutenberg-University Mainz
2 mm accumulated precipitation from 06 UTC 9 to 06 UTC 11 January 2002: observations and results of a UW-NMS model simulation climatologic January mean: 1mm from Knippertz and Martin mm in 48h in Podor
3 COSMO-MODEL simulation TRMM-satellite observation
4 upper-level trough COSMO-MODEL simulation TRMM-satellite observation
5 Potential vorticity (PV) modification due to latent heating ρ z latent heating Air with low PV-values on high isentropic surfaces surface
6 latent heating L PV- PV+ PV moisture / uplift Atlantic
7 latent heating L PV- - PV+ moisture / uplift
8 latent heating L - + PV+ PVmoisture / uplift
9 Hypothesis: latent heating during upstream cyclogeneses over the extratropical Atlantic amplification of the PV wave and enforcing of the positive PV-anomaly in front of the west African coast more moisture transport and forcing over West Africa strengthening of the precipitation event
10 COSMO-Model configuration COSMO-Model version 3.21 resolution: 0.4 x 0.4 ; 40 layers; 250x175 gp IFS-analyses as initial and boundary data cloud ice microphysics; Kain-Fritsch convection scheme timestep 60s; runge-kutta dynamics runs started on 2nd January UTC
11 Model domain
12 Sensitivity experiments: control run with full physics completely dry run latent heat constants 0 temperature tendencies concerning lh = 0 - in the whole domain - in parts of the domain - until day five of simulation
13 hpa mean PV control run UTC PVU
14 PVU full physics 0.0 T-tendencies = PVU LH -constants = dry run
15 hpa mean PV control run UTC PVU
16 full physics T-tendencies = 0 LH -constants = 0 PVU PVU dry run
17 K hpa equivalent potential temperature on 850 hpa and sea-level pressure in hpa
18 < 970hPa < 1010hPa < 990hPa < 1020hPa K full physics 5th January UTC experiment (T-tendencies =0)
19 hpa differences in sea-level pressure in hpa difference full physics - experiment 5th January UTC 9th January UTC
20 First summary deeper cyclones in the extratropics with latent heating stronger PV-anomalies in the extratropics and near the African coast differences more obvious on 5th January effect on the precipitation quantity?
21 48h accumulated precipitation 9th January 06 UTC full physics experiment
22 48h accumulated precipitation 9th January 06 UTC full physics run latent heating suppressed only in parts of the domain
23 48h accumulated precipitation 9th January 06 UTC full physics run latent heating started after first PV-anomaly had passed
24 Only weak influence of latent heating on simulated precipitation quantity
25 kg/m^ kg/m^ full physics full physics - experiment vertically integrated water vapor, cloud-water, cloud-ice in kg/m 2 9th January UTC
26 g/kg g/kg full physics experiment 78h backward trajectories specific humidity along trajectories 9th January UTC - 6th January UTC -
27 g/kg g/kg full physics full physics - experiment mixingratio g/kg and wind 700hPa
28 gpdm K full physics - experiment Δgeopotential 700hPa in gpdm full physics - experiment ΔT 850 hpa in K 6th January UTC
29 km K m full physics run 60h backward trajectories height along trajectories full physics - experiment ΔT 850 hpa in K 6th January UTC
30 km K full physics run 60h backward trajectories height along trajectories 6th January UTC full physics - experiment ΔT 500 hpa in K 6th January UTC -60h
31 Conclusions - Strong influence of latent heating in the extratropics (cyclogeneses, fronts, PV-structures) - Stronger PV-anomalies near West Africa - Weak changes in the precipitation quantity - Higher atmospheric water content in sensitivity experiment - Weaker moisture transport in the control run due to compensating geopotential modification
32
33
34 l2tls=.true., irunge_kutta=2, irk_order=3, iadv_order=5, lsl_adv_qx=.false., yef_adv_qx='bott_4', lva_impl_dyn=.true., ieva_order=3,
35 ECMWFanalysis Runge Kutta Leapfrog
36 full physics LH off in parts of domain
37 Kain-Fritsch Tiedtke
38
39 full physics 5th January UTC full physics - experiment mixingratio g/kg and wind 700hPa
40 full physics full physics - experiment mixingratio g/kg and wind 700hPa
41 full physics full physics - experiment mixingratio g/kg and wind 700hPa
42 full physics full physics - experiment mixingratio g/kg and wind 700hPa
43 full physics full physics - experiment mixingratio g/kg and wind 700hPa
44 full physics full physics - experiment mixingratio g/kg and wind 700hPa
45 full physics full physics - experiment mixingratio g/kg and wind 700hPa
46 full physics full physics - experiment mixingratio g/kg and wind 700hPa
47 full physics full physics - experiment mixingratio g/kg and wind 700hPa
48 Conclusions - Strong influence of latent heating in the extratropics (cyclogeneses, fronts, PV-structures) - Stronger PV-anomalies near West Africa - Weak changes in the precipitation quantity - Higher atmospheric water content in sensitivity experiment - Weaker moisture transport in the control run due to compensating geopotential modification
49 975hpa Equivalent potential temperature on 850 hpa and sea-level pressure
50 < 970hPa full physics < 1000hPa experiment 9th January UTC
51 full physics run full physics - experiment vertical motion on 700hPa in Pa s -1 9th January UTC
52 cyclone development in dry dynamics Lifecycle (LC) 1 Jet after Thorncroft et al. 1991
53 full physics - experiment ΔT 850 hpa in K and Δgeopotential 850hpa in gpdm full physics - experiment ΔSLP in hpa and Δgeopotential 500hPa in gpdm 6th January UTC
54 abs. vorticityadvection and SLP 6th January UTC full physics run
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