P2C2: Positive Feedback between Dust, Radiation, Precipitation and Temperature as a Driver for Abrupt Climate Change

P2C2：灰尘、辐射、降水和温度之间的正反馈是气候突变的驱动因素

• 批准号: 1304540
• 负责人: Amy Clement
• 金额: $ 40.31万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-15 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304540&HistoricalAwards=false
• 关键词: P2C2; Positive; Feedback; between; Dust

Aerosol feedbacks represent one of the highest uncertainties in the dynamics of the Earth system (IPCC, 2007). Paleoclimate records show significant fluctuations in dust associated with changes in climate. However, the role of dust as a feedback to climate change in the past and into the future remains highly uncertain. The proposed working hypothesis is that a positive feedback between dust, radiation, precipitation and temperature is an important driver for abrupt climate change. Researchers from the University of Miami will focus on two periods of abrupt climate change in the Atlantic: Heinrich Event 1 and the termination of the African Humid Period. These are two periods of abrupt climate change for which the source of the abruptness is still a matter of debate. PIs will run transient paleoclimate simulations using the National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM) coupled to an interactive dust model, synthesize paleo-dust and drought records, and test the sensitivity of their results to changes in dust optical properties. Intellectual MeritThe proposed research will advance our understanding and knowledge of forcing and feedbacks associated with desert dust in past periods of abrupt climate change, and determine if climate change is more abrupt when dust is an interactive component. Through model-data synthesis, the PIs will analyze if the inclusion of dust climate feedback in paleoclimate simulations bring models into better agreement with observations. Results from the transient paleoclimate simulations will be made available online to facilitate paleoclimate model-data intercomparisons. Broader ImpactsThe project will establish linkages between the University of Miami, NCAR, and Cornell University through the use of CESM and the participation in the CESM Paleoclimate Working Group. Research activities will be presented at scientific conferences, workshops, and community outreach events, such as the science café (http://www.rsmas.miami.edu/info/seminar-archive/msg01683.html). Knowledge gained from this work will be used to prepare curriculum material for undergraduate and graduate courses taught at the University of Miami. The PIs participate in the Earth Science Women's Network (ESWN), a group that promotes mentoring, support, professional collaborations, and career development with other women working in science and technology. In addition, the PIs participate in the annual RSMAS Women in Science day. This program targets sixth and seventh grade girls, and female scientists from the Rosenstiel School lead hands-on activities in their scientific field to engage the young participants.

气溶胶反馈代表了地球系统动力学中最高的不确定性之一（IPCC，2007年）。古气候记录显示，与气候变化相关的灰尘波动显着波动。但是，尘埃作为对过去和未来气候变化的反馈的作用仍然高度不确定。提出的工作假设是，尘埃，辐射，精度和温度之间的正反馈是突然气候变化的重要驱动力。迈阿密大学的研究人员将重点介绍大西洋突然的气候变化时期：海因里希事件1和非洲潮湿时期的终止。这是两个突然的气候变化时期，突然的来源仍然是辩论的问题。 PIS将使用国家大气研究中心（NCAR）社区地球系统模型（CESM）进行瞬时古气候模拟，并结合了交互式灰尘模型，合成古尘和干旱记录，并测试其结果对尘埃光学特性变化的敏感性。知识分子优点拟议的研究将提高我们在过去的气候变化时期与沙漠尘埃相关的强迫和反馈的理解和知识，并确定当灰尘是互动成分时，气候变化是否更突然。通过Model-DATA合成，PI将分析是否在古气候模拟中包含尘埃气候反馈，使模型与观察结果更好地吻合。瞬态古气候模拟的结果将在线提供，以促进古气候模型数据间的围绕群体。更广泛的影响该项目将通过使用CESM和参与CESM古气候工作组，建立迈阿密大学，NCAR和康奈尔大学之间的联系。研究活动将在科学会议，研讨会和社区外展活动中介绍，例如科学咖啡馆（http://www.rsmas.miami.edu/info/info/seminar-archive/msg01683.html）。从这项工作中获得的知识将用于为迈阿密大学教授的本科和研究生课程准备课程材料。 PIS参加了地球科学妇女网络（ESWN），该小组与其他从事科学技术的女性一起促进心理，支持，专业合作和职业发展。此外，PIS还参加了科学日的年度RSMA妇女。该计划针对的是六年级和七年级的女孩，罗森斯特学校的女科学家在其科学领域领导动手活动，以吸引年轻参与者。