Dear CF-metadata group, we have several proposals, which we send as a numbered list. Thanks for your help beforehands!! 1. Basing on surface_direct_downwelling_shortwave_flux_in_air we want to apply for the new standard name surface_normalized_direct_downwelling_shortwave_flux_in_air for use in renewable energy tasks. It is the surface_direct_downwelling_shortwave_flux_in_air on a plane, oriented perpendicular to the incoming beam. New name: surface_normalized_direct_downwelling_shortwave_flux_in_air Description: The surface called "surface" means the lower boundary of the atmosphere. “Normalized_direct" radiation is radiation that has followed a direct path from the sun to a plane perpendicular to the direction of the sun (in contrast to the “direct” radiation, which falls on a plane horizontal at the earth surface). Downwelling radiation is radiation from above. It does not mean "net downward". The sign convention is that "upwelling" is positive upwards and "downwelling" is positive downwards. The term "shortwave" means shortwave radiation. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. Unit: W m-2
2. Analog to atmosphere_mass_content_of_cloud_liquid_water we want to apply for two new standard names: atmosphere_mass_content_of_rainwater and atmosphere_mass_content_of_snow. It is the rain water or snow content resp. (excluding the cloud liquid water and cloud snow content). New name: atmosphere_mass_content_of_rainwater Description: "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. "Rainwater" refers to the precipitating part of liquid water in the atmosphere – the cloud liquid water is excluded. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. Unit: kg m-2 New name: atmosphere_mass_content_of_snow Description: "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. "Snow" refers to the precipitating part of snow in the atmosphere – the cloud snow content is excluded. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. Unit: kg m-2 3. The description of atmosphere_mass_content_of_cloud_liquid_water is incomplete, as "cloud_liquid_water" is not mentioned. New Description: "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. "Cloud liquid water" refers to the liquid phase of cloud water. For the content between specified levels in the atmosphere, standard names including content_of_atmosphere_layer are used. 4. The description of equivalent_potential_temperature is misleading because the term "equivalent" is not explained at all. The quantity does not exist for sea water. New description: "equivalent potential temperature" refers to a thermodynamic quantity, with its natural logarithm proportional to the entropy of moist air, that is conserved in a reversible moist adiabatic process. (AMS-glossary) The standard name air_potential_temperature is misleading because the description refers to air and sea water. We recommend replacing the standard name by potential_temperature. Best regards, Beate Geyer and Ronny Petrik Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH Max-Planck-Straße 1 I 21502 Geesthacht I Deutschland/Germany Geschäftsführung/Board of Management: Prof. Dr. Wolfgang Kaysser, Silke Simon Vorsitzender des Aufsichtsrates/Chairman of the Supervisory Board: Ministerialdirigent Dr. Herbert Zeisel Amtsgericht Lübeck HRB 285 GE (Register Court) Internet: http://www.hzg.de
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