Both the windward/lee effect and the diurnal cycle problem strongly limit the application of mesoscale models for many decision makers and end users alike (e.g., hydrologists generally refrain from ...using QPF results to extend the lead time for flash flood warnings). Within a strong collaboration between atmospheric scientists, modelers, and instrument principal investigators (PIs) at various universities and research and weather forecast centers, a list of fundamental hypotheses has been developed: * Upper tropospheric features play a significant but not decisive role for convective-scale QPF in moderate orographic terrain. * Accurate modeling of the orographic controls of convection is essential and only possible with advanced mesoscale models featuring a resolution of a few kilometers. * Location and timing of the initiation of convection critically depends on the structure of the humidity field in the planetary boundary layer. * Continental and maritime aerosol-type clouds develop differently over mountainous terrain leading to different intensities and distributions of precipitation. * Novel instrumentation during COPS can be designed so that parameterizations of subgrid-scale processes in complex terrain can be improved. * Real-time, mesoscale data assimilation of key prognostic variables such as water vapor and dynamics is routinely possible and leads to a significantly better short-range QPF.\n The Data Assimilation and Predictability (DAP) working group studies the impact of current and new observations on improving QPF.
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The international field campaign called the Convective and Orographically-induced Precipitation Study (COPS) took place from June to August 2007 in southwestern Germany/eastern France. The ...overarching goal of COPS is to advance the quality of forecasts of orographically-induced convective precipitation by four-dimensional observations and modeling of its life cycle.
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54.
ADITIONAL APPLICATIONS OF THE D-PHASE DATASETS Rotach, Mathias W.; Ambrosetti, Paolo; Ament, Felix ...
Bulletin of the American Meteorological Society,
09/2009, Volume:
90, Issue:
9
Journal Article
Peer reviewed
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55.
MAP D-PHASE Rotach, Matthias W; Ambrosetti, Paolo; Ament, Felix ...
Bulletin of the American Meteorological Society,
09/2009, Volume:
90, Issue:
9
Journal Article
Peer reviewed
Generally, a FDP aims at demonstrating the advances a research and development activity (or any other trigger) has brought to operational atmospheric forecasting. ... a FDP * deals with the forecast ...of weather with international relevance (high-impact weather); * demonstrates a clear advance in forecasting capability; * provides clear evaluation protocols; and * is characterized by an expectation of success.
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The 3-year project "Research for Climate Protection: Model Run Evaluation" (reclip:more) is a cooperation of five academic institutions in Austria The major aim of the project is to evaluate the ...capability of dynamical and statistical downscaling methods in the Alpine region to create climate scenarios at mesoscale and microscale resolutions. Two regional circulation models ALADIN and the PSU/NCAR mesoscale model MM5 will be driven by ERA-40 reanalysis data and ECHAM5 global circulation model (GCM) results, representing current (1991-2000) and future (2041-2050) climate to accomplish dynamical downscaling from the coarse GCM resolution (spectral truncation T106, i.e. similar to 120 km horizontal resolution) to 10-15 km. The evaluation of the 2D surface fields of the retrospective runs are performed with the Vienna Enhanced Resolution Analyses (VERA) scheme. VERA produces model independent 2D analyses of meteorological parameters on a regular grid. The comparison will cover single extreme events, an annual cycle and a ten year period. The results will serve as a criteria to find the best model set up for the prospective runs.
The 3-year project “Research for Climate Protection: Model Run Evaluation” (reclip:more) is a cooperation of five academic institutions in Austria The major aim of the project is to evaluate the ...capability of dynamical and statistical downscaling methods in the Alpine region to create climate scenarios at mesoscale and microscale resolutions. Two regional circulation models ALADIN and the PSU/NCAR mesoscale model MM5 will be driven by ERA-40 reanalysis data and ECHAM5 global circulation model (GCM) results, representing current (1991-2000) and future (2041-2050) climate to accomplish dynamical downscaling from the coarse GCM resolution
(spectral truncation T106, i.e. ~120 km horizontal resolution) to 10-15 km. The evaluation of the 2D surface fields of the retrospective runs are performed with the Vienna Enhanced Resolution Analyses (VERA) scheme. VERA produces model independent 2D analyses of meteorological parameters on a regular grid. The comparison will cover single extreme events, an annual cycle and a ten year period. The results will serve as a criteria to find the best model set up for the prospective runs.
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