High Resolution, Active Remote Sensing of Cloud Microphysics at Summit, Greenland with Polarized Raman Lidar

在格陵兰岛峰会上使用偏振拉曼激光雷达对云微物理进行高分辨率、主动遥感

• 批准号: 1303864
• 负责人: Jeffrey Thayer
• 金额: $ 128.04万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1303864&HistoricalAwards=false
• 关键词: Resolution; Active; Remote; Sensing; Cloud

A better understanding of Arctic cloud and aerosol properties, structure and formation is essential to understand the specific response of the Arctic in the context of global climate change. A lack of coherent high vertical and temporal resolution observations of cloud particles, aerosols moisture advection (i.e. water vapor) and thermodynamics, creates large uncertainties in current model estimates of cloud properties and inhibits our understanding of cloud radiative and precipitation impacts on the surface. As a result, current weather and climate models poorly parameterize clouds over the Arctic and more specifically over the Greenland Ice Sheet (GIS). A reduction in this uncertainty is particularly important above the GIS, where clouds act as sinks and sources to the ice mass balance by modulating the surface radiation budget and available precipitable water. To gain the understanding necessary to reduce this uncertainty, a new autonomous multi-wavelength, polarized Raman lidar is proposed for development and deployment at the NSFʼs observatory in Summit, Greenland. The new lidar observations will employ multiple wavelengths and polarizations to observe elastic and inelastic scattering from the Arctic atmosphere enabling regular retrieval of temperature, water vapor and extinction profiles. This combination of observational capability will create a coherent dataset of high-resolution thermodynamic, cloud and aerosol observations through the Arctic troposphere and lower stratosphere above Summit. Broadly, this addition to the NSF Observatory at Summit, Greenland as part of the larger Arctic Observing Network fits well within the Study of Environmental Arctic Change (SEARCH) implementation plan. Thus, this instrument will significantly enhance Arctic observing infrastructure and advance observations and understanding of change in the Arctic. The proposed instrumentation and observations are the first of their kind on the GIS and will expand the existing, although modest, network of such measurements across the Arctic. This project will also provide a unique experience and educational opportunity through the combination of fieldwork and subsequent data processing for graduate students at the University of Colorado.

更好地了解北极云和气溶胶的特性、结构和形成，对于了解北极在全球气候变化背景下的具体反应至关重要。缺乏一致的高垂直和时间分辨率观测云粒子，气溶胶水分平流（即水蒸气）和热力学，造成很大的不确定性，在目前的模式估计云的属性，并抑制我们的云辐射和降水的影响的理解对表面。因此，目前的天气和气候模型对北极上空的云，特别是格陵兰冰盖（GIS）上空的云的参数化很差。减少这种不确定性是特别重要的GIS，云作为汇和源的冰质量平衡调制的表面辐射收支和可用的可降水量。为了获得必要的理解，以减少这种不确定性，一个新的自主多波长，偏振拉曼激光雷达提出了开发和部署在美国国家科学基金会#700;的天文台首脑会议，格陵兰岛。新的激光雷达观测将采用多种波长和偏振来观测北极大气的弹性和非弹性散射，从而能够定期检索温度、水蒸气和消光剖面。这一观测能力的结合将创建一个通过Summit上空的北极对流层和平流层下部进行高分辨率热力学、云和气溶胶观测的连贯数据集。总体而言，作为更大的北极观测网络的一部分，格陵兰岛萨米特的NSF观测站的增加非常符合北极环境变化研究（SEARCH）实施计划。因此，这一工具将大大加强北极观测基础设施，推进对北极变化的观测和了解。拟议的仪器和观测是地理信息系统上的第一个此类仪器和观测，将扩大现有的、尽管规模不大的北极地区此类测量网络。该项目还将通过实地考察和随后的数据处理相结合，为科罗拉多大学的研究生提供一个独特的经验和教育机会。

项目成果

Radiative Influence of Horizontally Oriented Ice Crystals over Summit, Greenland

格陵兰岛山顶水平定向冰晶的辐射影响

• DOI: 10.1029/2018jd028963
• 发表时间: 2019
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Stillwell, Robert A.;Neely, III, Ryan R.;Thayer, Jeffrey P.;Walden, Von P.;Shupe, Matthew D.;Miller, Nathaniel B.
• 通讯作者: Miller, Nathaniel B.