Active and Passive Radiative Transfer Simulations for GPM-Related Field Campaigns

Adams, Ian S ; Munchak, S Joseph ; Kuo, Kwo-Sen ; Pelissier, Craig ; Clune, Thomas ; Kroodsma, Rachael ; Loftus, Adrian ; Li, Xioawen

关键词: RADIATIVE TRANSFER;    REFLECTANCE;    BRIGHTNESS TEMPERATURE;    CLOUDS (METEOROLOGY);    PRECIPITATION (METEOROLOGY);    SIMULATION;    ATMOSPHERIC MODELS;    RADIOMETERS;    RADAR;    POLARIZATION;   

RP-ID  :  GSFC-E-DAA-TN72143

学科分类：地球科学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Using a three-dimensional radiative transfer model combined with cloud-resolving model output, we simulate active and passive sensor observations of clouds and precipitaiton. This combination of tools allows us to diagnose the contributions of various hydrometeor types. Radar multiple scattering is most closely associated with the presence of graupel. At Wband, massive amounts multiple scattering in deep convection can decorrelate the reflectivity profile from the vertical structure, but for less intense events, multiple scattering could be a useful indicator of riming. For passive sensors, polarization differences at 166 GHz indicate the presence of horizontally aligned frozen particles with pronounced aspect ratios, while high concentrations of more isotropic aggregates and graupel dampen the polarization difference while also contributing to the lowest brightness temperature depressions. The insights into remote sensing measurements will facilitate the development of improved algorithms and advanced sensors.