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Exploring the Linkages among Mid-Latitude Dynamics, Clouds, and Climate Sensitivity

探索中纬度动态、云和气候敏感性之间的联系

基本信息

批准号：
1522829
负责人：
Kevin Grise
金额：
$ 29.83万
依托单位：
University of Virginia Main Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-08-01 至 2020-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1522829&HistoricalAwards=false
关键词：
Exploring Linkages among Mid Latitude

项目摘要

The goal of this research is to better understand the connection between mid-latitude clouds and dynamics in observations. The reasons for why the such linkages are well-represented in some global climate models but not in others will be studied. The implications of these processes on model climate sensitivity and future climate projections will also be examined. In the first part of the project, observed and model cloud radiative properties will be composited with respect to the centers of cyclones and anticyclones over the mid-latitude oceans of the Northern and Southern Hemispheres, to examine in the sectors of weather systems linked to model biases and uncertainties in future climate projections. In the second part of the project, idealized model experiments will be performed using two versions of the Community Atmosphere Model with very different representations of Southern Ocean cloud radiative properties. In both model versions, quadrupled carbon dioxide experiments will be run with the radiative properties of the clouds enabled and disabled, in order to explore the role of varying cloud-radiative effects in governing the response of the Southern Hemisphere mid-latitude jet to increased greenhouse gas forcing. By better understanding cloud-radiative-dynamical connections in observations and how they are misrepresented in models, the proposed project not only can improve theoretical knowledge of the role of clouds in the climate system, but also can provide additional constraints on cloud parameterizations that will help to reduce uncertainty in future model projections.

这项研究的目的是为了更好地了解中纬度云和观测动态之间的联系。为什么这种联系在一些全球气候模式中表现得很好，而在其他模式中却没有，其原因将被研究。还将研究这些过程对模式气候敏感性和未来气候预估的影响。在该项目的第一部分中，将综合北半球和南半球中纬度海洋上的气旋和反气旋中心的观测和模式云辐射特性，以检查与模式偏差和未来气候预测的不确定性有关的天气系统部门。在该项目的第二部分，将使用两个版本的社区大气模式进行理想模式实验，这些模式对南大洋云的辐射特性有非常不同的表示。在这两个模式版本中，将在启用和禁用云的辐射特性的情况下进行四倍二氧化碳实验，以探索不同的云辐射效应在控制南半球中纬度急流对增加的温室气体强迫的响应中的作用。通过更好地了解观测中的云-辐射-动力联系以及它们如何在模式中被错误地表示，拟议的项目不仅可以提高云在气候系统中作用的理论知识，而且还可以为云参数化提供额外的约束，这将有助于减少未来模式预估中的不确定性。