Investigating the impact of Land-use and land-cover change on Aerosol-Cloud-precipitation interactions Using Polarimetric Radar retrievals (ILACPR)

使用偏振雷达反演 (ILACPR) 研究土地利用和土地覆盖变化对气溶胶-云-降水相互作用的影响

• 批准号: 408013362
• 负责人: Dr. Prabhakar Shrestha, Ph.D.
• 金额: --
• 依托单位: Abteilung Meteorologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/408013362?language=en
• 关键词: Investigating; impact; Land; use; land

Project ILACPR contributes to objective one of a priority programme, the exploitation of radar polarimetry for quantitative process and model evaluation, and provides new insights on the impact of anthropogenic land-use and land-cover changes on cloud microphysical and macrophysical (dynamical) mechanisms. Preliminary numerical modeling study of summertime convective storm with large-scale perturbation of aerosols and change in land-cover suggests that the response of the system in terms of surface precipitation to the forcing is weak. However, the microphysical/macrophysical pathways acting as a buffered system to the changes in forcing, differs. Polarimetric radar measurements in combination with such numerical model scenarios allow investigation of the buffering mechanisms, arising from interactions between land, aerosols, clouds and precipitation processes. Polarimetry enables us to study the evolution of the microphysical and macrophysical processes for simulated as well as observed precipitating clouds. The sketches of modified precipitation generating processes in terms of polarimetric fingerprints enables us to validate the results from the numerical model scenarios and represent the feedback processes between the surface flux partitioning and aerosol-cloud interactions. The Terrestrial Systems Modeling Platform (TerrSysMP) will be used to investigate the impact of land-use/land-cover change on aerosol distributions and land-aerosol-cloud-precipitation interactions. While the atmospheric model in TerrSysMP currently ignores the variability and feedbacks of land-cover, atmospheric chemistry and aerosols, the model will be extended with a chemical transport model (CTM) to allow for the quantitative investigation of land-aerosol-cloud-precipitation interaction.Multiple ensemble simulations over diurnal scales with different meteorological settings will be conducted with TerrSysMP and TerrSyMP-CTM over the northwestern part of Germany, bordering Netherlands, Belgium, Luxemburg and France. The common analysis of observed and synthetic (model generated) polarimetric fingerprints for microphysical and macrophysical processes, like evaporation, riming / aggregations, and updraft-downdraft intensities based on different model scenarios with and without CTM represents a new promising strategy to understand the impact of anthropogenic land-use and land-cover changes on the evolution of precipitation generating systems.

ILACPR项目有助于优先方案的目标之一，即利用雷达偏振法进行定量过程和模式评价，并提供关于人为土地利用和土地覆盖变化对云微物理和宏观物理（动力）机制的影响的新见解。对具有气溶胶大尺度扰动和地表覆盖变化的夏季对流风暴的初步数值模拟研究表明，该系统在地表降水方面对强迫的响应较弱。然而，作为对强迫变化的缓冲系统的微物理/宏观物理途径有所不同。极化雷达测量与这种数值模式情景相结合，可以研究由于陆地、气溶胶、云和降水过程之间的相互作用而产生的缓冲机制。偏振法使我们能够研究模拟和观测到的降水云的微物理和宏观物理过程的演变。基于极化指纹图谱的改进降水生成过程草图使我们能够验证数值模式情景的结果，并代表地表通量分配和气溶胶-云相互作用之间的反馈过程。陆地系统模拟平台（TerrSysMP）将用于研究土地利用/土地覆盖变化对气溶胶分布和陆地-气溶胶-云-降水相互作用的影响。虽然TerrSysMP中的大气模式目前忽略了土地覆盖、大气化学和气溶胶的变率和反馈，但该模式将扩展为化学输送模式（CTM），以便对陆地-气溶胶-云-降水相互作用进行定量研究。利用TerrSysMP和TerrSysMP - ctm在德国西北部与荷兰、比利时、卢森堡和法国接壤的地区进行不同气象条件下的日尺度综合模拟。基于有CTM和没有CTM的不同模式情景，对观测到的和合成的（模式生成的）微物理和宏观物理过程的极化指纹图谱进行共同分析，如蒸发、边缘/聚集和上升-下降流强度，代表了一种新的有前途的策略，可以理解人为土地利用和土地覆盖变化对降水发生系统演变的影响。