IPY: Remote Sensing of the Macro and Microphysical Structure of Arctic Clouds During ASCOS

IPY：ASCOS期间北极云宏观和微观物理结构的遥感

• 批准号: 0732925
• 负责人: Ola P Persson
• 金额: $ 29.99万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732925&HistoricalAwards=false
• 关键词: IPY; Remote; Sensing; Macro; Microphysical

Persson 0732925Univ. of Colorado/ CIRESThe international Arctic Summer-Clouds Ocean Study (ASCOS) will provide anopportunity during the International Polar Year (IPY) to obtain measurements of macro- and microphysical properties of clouds over the pack ice in the high Arctic. These measurements will be particularly unique and valuable because they will be co-located with fine-scale measurements of the Arctic boundary-layer structure and processes and of aerosol concentrations and types. The data set will be a legacy of IPY. In particular, they provide critical data for validation of climate model parameterizations of Arctic clouds, addressing a key issue identified in current climate models.Funds are provided to:1) Deploy a cloud radar, a microwave radiometer, and a ceilometer onboard the icebreaker R/V Oden to obtain measurements from which the PI will derive cloud macro- and microphysical properties. The measurements will be obtained in Arctic all-liquid, all-ice, and mixed-phase clouds near the North Pole during the international ASCOS field program in July- September, 2008. The macrophysical properties will include cloud base, cloud top, cloud fraction, cloud duration, and cloud reflectivity. The microphysical properties will include cloud phase, liquid water path, and profiles of ice water content, ice particle effective radius, liquid water content, effective drop radius, vertical velocity, and turbulent dissipation rate. 2) Compare these properties during this pack-ice transition season to cloud properties similarly derived by the project participants and others over the pack ice during SHEBA, at Arctic Ocean coastal sites near Barrow, Alaska, and at the SEARCH site in Eureka, Canada.3) Temporally and spatially link these cloud properties to the evolution of the boundary-layer wind and thermodynamic structure and to the evolution and distribution of aerosols measured by other researchers during ASCOS. This objective will provide insights to key processes for the current climate and for Arctic climate change, and is highly linked to work by other ASCOS participants, hence requiring significant international scientific collaboration.

0732925Univ.国际北极夏季云海洋研究（ASCOS）将在国际极地年（IPY）期间提供一个机会，以获得高北极浮冰上方云的宏观和微观物理特性的测量结果。这些测量将是特别独特和有价值的，因为它们将与北极边界层结构和过程以及气溶胶浓度和类型的精细测量放在同一地点。 该数据集将是国际和平年的遗产。 特别是，它们为验证北极云的气候模型参数化提供了关键数据，解决了当前气候模型中确定的一个关键问题。提供的资金用于：1）在“奥登”号破冰船上部署云雷达、微波辐射计和云高计，以获得测量数据，PI将从中得出云的宏观和微观物理特性。这些测量将在2008年7月至9月的国际ASCOS现场计划期间在北极附近的北极全液体、全冰和混合相云中获得。宏观物理特性包括云底、云顶、云分数、云持续时间和云反射率。微物理特性将包括云相、液态水路径、冰水含量、冰粒有效半径、液态水含量、有效滴半径、垂直速度和湍流耗散率的剖面。2)将该浮冰过渡季节的这些特性与SHEBA期间项目参与者和其他人在阿拉斯加巴罗附近的北冰洋沿海站点和尤里卡的ESPRIT站点在浮冰上类似得出的云特性进行比较，3）将这些云的特性与边界的演变在时间和空间上联系起来-层风和热力学结构以及其他研究人员在ASCOS期间测量的气溶胶的演变和分布。这一目标将为当前气候和北极气候变化的关键过程提供见解，并与其他ASCOS参与者的工作密切相关，因此需要大量的国际科学合作。