Collaborative Research: Understanding and Modeling Key Arctic Cloud-ABL-Surface Processes and Interactions

合作研究:理解和建模关键的北极云-ABL-地表过程和相互作用

基本信息

  • 批准号:
    1023366
  • 负责人:
  • 金额:
    $ 66.47万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2010
  • 资助国家:
    美国
  • 起止时间:
    2010-09-01 至 2014-08-31
  • 项目状态:
    已结题

项目摘要

The Arctic lower troposphere represents a sensitive balance between surface, atmospheric boundary layer, and cloud processes, forming a cloud-ABL-surface (CAS) system. Changes to a component in this system will produce physical responses in the other components, culminating in the net system response to the change. In order to accurately simulate the net CAS contributions and responses to a component change, such as to the predicted change from primarily multi-year sea-ice to first-year sea-ice, the process interactions between the CAS components must be well understood and quantitatively represented in coupled climate models. Unfortunately, the understanding of various key processes and their interactions is very nascent, leading to poor representations in current global or regional climate models. Hence, significant uncertainties exist in modeled parameters such as cloud fraction, ice water path, and liquid water path, resulting in surface cloud radiative forcing that varies by 40 W m-2 among models and modeled surface turbulent heat fluxes that have poor correlations with observations. Even basic surface parameters, such as albedo, are often not physically represented and provide a source of significant errors to the CAS system. This proposal focuses on understanding the complex processes and interactions in the Arctic CAS system using existing observations and process models and on improving key parameterizations in these process models. A broad range of existing in-situ and remotely sensed observational data will be used in the analyses. The process modeling will be done with multiple-resolution configurations of the Weather and Research Forecasting Model (WRF). Observational analyses and model evaluations will be conducted using process-oriented diagnostics -- diagnostics that reveal physical relationships directly relevant to a process and/or parameterization. Through informal collaboration with the National Center for Atmospheric Research (NCAR), preliminary evaluations of the ability of a state-of-the-art global climate model (GCM), the Community Climate System Model (CCSM), to faithfully represent these process interactions will also be performed, providing initial insight as to whether key processes and relationships found in observations and process models are also represented in CCSM.
北极对流层低层代表了地面、大气边界层和云过程之间的敏感平衡,形成了云-ABL-地面(CAS)系统。对该系统中某个组件的更改将在其他组件中产生物理响应,最终导致系统对更改的净响应。 为了准确地模拟CAS的净贡献和对一个组成部分变化的响应,例如对预测的从主要是多年海冰到第一年海冰的变化,CAS组成部分之间的过程相互作用必须得到很好的理解,并在耦合的气候模式中定量表示。 不幸的是,对各种关键过程及其相互作用的理解还处于起步阶段,导致目前全球或区域气候模式的代表性很差。 因此,显着的不确定性存在于模拟的参数,如云分数,冰水路径,液态水路径,导致地面云辐射强迫的变化40 W m-2之间的模型和模拟的地面湍流热通量与观测的相关性较差。 即使是基本的表面参数,如反射率,往往没有物理表示,并提供了一个源的重大错误的CAS系统。该提案的重点是利用现有观测和过程模型了解北极CAS系统的复杂过程和相互作用,并改进这些过程模型的关键参数化。分析中将使用各种现有的实地和遥感观测数据。 过程建模将使用天气和研究预报模型(WRF)的多分辨率配置来完成。 观测分析和模型评价将使用面向进程的诊断方法进行,这些诊断方法揭示与进程和(或)参数化直接相关的物理关系。 通过与国家大气研究中心(NCAR)的非正式合作,还将对最先进的全球气候模式(GCM),社区气候系统模式(CCSM)忠实地代表这些过程相互作用的能力进行初步评估,提供初步的见解,以确定观测和过程模式中发现的关键过程和关系是否也在CCSM中得到代表。

项目成果

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Ola P Persson其他文献

Ola P Persson的其他文献

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{{ truncateString('Ola P Persson', 18)}}的其他基金

Impact of Synoptic and Mesoscale Disturbances on the Beginning and End of the Summer Melt Season Over Sea Ice
天气和中尺度扰动对夏季海冰融化季节开始和结束的影响
  • 批准号:
    0714053
  • 财政年份:
    2007
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Standard Grant
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
  • 财政年份:
    2007
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Standard Grant
Collaborative Research: Improving Remotely Sensed Surface Fluxes Over Sea Ice
合作研究:改善海冰表面通量的遥感
  • 批准号:
    0612428
  • 财政年份:
    2007
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Standard Grant
GCM-Scale Surface Fluxes and Flux Parameterizations Determined from SHEBA Observations and a Nested Mesoscale Model
根据 SHEBA 观测和嵌套中尺度模型确定的 GCM 尺度表面通量和通量参数化
  • 批准号:
    0084322
  • 财政年份:
    2000
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Continuing Grant
Mid-Oceanic Wintertime Surface Fluxes and Atmospheric Boundary Layer Structure: Relationship to Cyclone Development and Evolution
冬季大洋中部地表通量和大气边界层结构:与气旋发展和演化的关系
  • 批准号:
    9727054
  • 财政年份:
    1998
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Standard Grant
A Study of the Effect of a Time-Varying Moist Potential Vorticity on the Evolution of Conditional Symmetric Instability
时变湿位涡对条件对称不稳定性演化的影响研究
  • 批准号:
    9296025
  • 财政年份:
    1991
  • 资助金额:
    $ 66.47万
  • 项目类别:
    Continuing Grant

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