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wdc-climate.de:3888265 eng; USA collection Aerocom_ECHAM6-HAM2_rain Jan Kretzschmar Leipzig Institute for Meteorology https://www.physgeo.uni-leipzig.de/institut-fuer-meteorologie/ pointOfContact Jan Kretzschmar Leipzig Institute for Meteorology https://www.physgeo.uni-leipzig.de/institut-fuer-meteorologie/ pointOfContact 2021-04-06T11:29:55 ISO 19115 ISO 19115-2:2009 ECHAM6-HAM2 model experiments to characterize the effect of parameterized autoconversion/warm rain on cloud lifetime 2022-12-01 publication 1 Aerocom_ECHAM6-HAM2_rain doi:10.26050/WDCC/Aerocom_ECHAM6-HAM2_rain Johannes Mülmenstädt Universität Leipzig https://meteo.physgeo.uni-leipzig.de Email: johannes.muelmenstaedt@uni-leipzig.de author WDC Climate at DKRZ publisher This experiment contains the model output from a series of sensitivity simulations, called "rain", carried out with the global aerosol-climate model ECHAM6-HAM2 (model version ECHAM6.1-HAM2.2-MOZ0.9). The simulations were performed within the scope of the AeroCom project (https://aerocom.met.no/). In general, the "rain" sensitivity study aims to provide a process-based observational constraint on the cloud lifetime effect by examining the parameterized precipitation stemming from warm rain. Aerosol (precursor) emission estimates of the year 2000 from the AEROCOM-II ACCMIP dataset were used as forcing. Details can be found in the associated publication of Mülmenstädt et al., (2020).  The sensitivity simulations aim at investigating the effect of changing the autoconversion tuning factor (gamma) and the critical effective radius (rc) in the parameterization of autoconversion (see Fig.3 and Eq. 3 in Mülmenstädt et al., (2020). The respective setting of these parameters is indicated in the dataset group name (e.g. AeroCom ECHAM6-HAM2 warm rain sensitivity simulation gamma${x_gamma} rc${x_rc}. In the default setting of ECHAM6-HAM2, gamma is 4 and rc is -1. rc=-1 is used for simulations where no critical impact radius is applied. In addition to microphysical variables, the model output includes simulated radar reflections from CloudSat created with the satellite simulator COSP (Cloud Feedback Model Intercomparison Project Observational Simulator Package, see Bodas-Salcedo et al., (2011)). The radar reflectivities are outputted on so-called subcolumns to include information on the subgrid variability of hydrometeors. The model output is provided as global fields on a reduced Gaussian Grid (N48) with 3-hourly temporal resolution and covers the period January 2000 to December 2004.  The dataset is well suited for evaluating the sensitivity of warm rain parameterization in ECHAM6-HAM2. The data publication is standardized according to the ATMODAT Standard (v3.0) (Ganske et al. 2021). The data standardization was funded within the framework of “Forschungsvorhaben zur Entwicklung und Erprobung von Kurationskriterien und Qualitätsstandards von Forschungsdaten” by the German Federal Ministry of Education and Research (BMBF; FKZ: 16QK02B). Jan Kretzschmar Leipzig Institute for Meteorology https://www.physgeo.uni-leipzig.de/institut-fuer-meteorologie/ pointOfContact NetCDF ATMODAT EASYDAB ECHAM6 FOS: Earth and related environmental science Precipitation aerosol atmos atmosphere atmospheric model atmospheric precipitation climate climate simulation control run CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ eng; USA 0.0 360.0 -90.0 90.0 proleptic_gregorian 2000-01-01 2004-12-31 mass_fraction_of_cloud_liquid_water_in_air Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y). [CF-Standard Name]; unit: not filled atmosphere_mass_content_of_cloud_ice Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. [CF-Standard Name]; unit: not filled surface_air_pressure The surface called "surface" means the lower boundary of the atmosphere.[CF-Standard Name]; unit: not filled air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled equivalent_reflectivity_factor "Equivalent reflectivity factor" is the radar reflectivity factor that is calculated from the measured radar return power assuming the target is composed of liquid water droplets whose diameter is less than one tenth of the radar wavelength, i.e., treating the droplets as Rayleigh scatterers. The actual radar reflectivity factor would depend on the size distribution and composition of the particles within the target volume and these are often unknown. [CF-Standard Name]; unit: not filled specific_humidity "specific" means per unit mass. Specific humidity is the mass fraction of water vapor in (moist) air.[CF-Standard Name]; unit: not filled cloud_area_fraction_in_atmosphere_layer "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. "X_area_fraction" means the fraction ofhorizontal area occupied by X. "X_area" means the horizontal area occupied by X within the grid cell. Cloud area fraction is also called "cloud amount" and "cloud cover". [CF-Standard Name]; unit: not filled geopotential_height Geopotential is the sum of the specific gravitational potential energy relative to the geoid and the specific centripetal potential energy. Geopotential height is the geopotential divided by the standard acceleration due to gravity. It is numerically similar to the altitude (or geometric height) and not to the quantity with standard name height, which is relative to the surface. [CF-Standard Name]; unit: not filled relative_humidity relative_humidity [CF-Standard Name]; unit: not filled mass_fraction_of_cloud_ice_in_air Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y). [CF-Standard Name]; unit: not filled atmosphere_mass_content_of_cloud_condensed_water alias: atmosphere_cloud_condensed_water_content "condensed_water" means liquid and ice. "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. [CF-Standard Name]; unit: not filled NetCDF 767422 https://www.wdc-climate.de/ui/entry?acronym=Aerocom_ECHAM6-HAM2_rain information collection n/a None