Modelling Climate, Solar and Geomagnetic Related Variations in the Deposition of Ice Core Beryllium-10 Isotopes

冰芯铍 10 同位素沉积过程中气候、太阳和地磁相关变化的模拟

• 批准号: 0317562
• 负责人: Gavin Schmidt
• 金额: $ 30.27万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-01 至 2006-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317562&HistoricalAwards=false
• 关键词: Modelling; Climate; Solar; Geomagnetic; Related

This award will allow the use a state-of-the-art atmospheric general circulation model to examine the impacts of climate and production rate changes on the deposition of Beryllium-10 isotopes (10Be) in ice cores. These results will in turn be used to constrain the different causes of variability in 10Be fluxes and thus improve estimates of possible solar magnetic field related production changes. Over decadal to centennial timescales, hypothesized variations in production rate, due to solar variability, are small, and the potential for climate impacts large. Therefore, before 10Be records can be unambiguously used to constrain solar variation, these impacts must be quantitatively addressed. This study will incorporate a stratosphere with a full aerosol tracer module and will focus on three separate questions: What is the impact of climate change on 10Be concentrations and flux? How are changes in 10Be production (solar and geomagnetic) recorded? How do solar changes in irradiance and production impact 10Be deposition? The model will be subjected to a large number of relevant climate forcings (both radiative and sea surface forcing). The proposed work should provide a deeper understanding of the information contained within the 10Be ice core records, and thus an improved estimate of solar variations through time. Better understanding of such forcings of past climate will help estimate the degree of variability in the Earth System and ultimately be an aid to environmental and economic policy makers.

该奖项将允许使用最先进的大气环流模型来研究气候和生产率变化对冰芯中Berlene-10同位素（10 Be）沉积的影响。 这些结果反过来将用于限制10 Be通量变化的不同原因，从而改进对可能与太阳磁场相关的生产变化的估计。 在十年到百年的时间尺度上，由于太阳的变化，假设的生产率变化很小，气候影响的可能性很大。 因此，在10 Be记录可以明确地用于限制太阳变化之前，必须定量地解决这些影响。 这项研究将包括一个完整的气溶胶示踪剂模块平流层，并将重点放在三个独立的问题：气候变化对10 Be浓度和通量的影响是什么？ 如何记录10 Be产生（太阳和地磁）的变化？ 太阳辐照度和产量的变化如何影响10 Be沉积？ 该模式将受到大量相关气候强迫（辐射强迫和海面强迫）的影响。 拟议的工作应该提供更深入的了解10 Be冰芯记录中包含的信息，从而改进对太阳随时间变化的估计。 更好地了解过去气候的这种强迫将有助于估计地球系统的变化程度，并最终帮助环境和经济政策制定者。