Projects in Climate Dynamics

气候动力学项目

• 批准号: 0812802
• 负责人: John Wallace
• 金额: $ 57万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0812802&HistoricalAwards=false
• 关键词: Projects; Climate; Dynamics

This project mainly covers three important research areas under the broad umbrella of climate dynamics by focusing on:a) Seasonal and year-to-year variations in the strength of the tropical upwelling in the Brewer-Dobson circulation. A major goal is to determine whether the annual cycle is forced primarily by variations in the upward flux of wave activity at high latitudes or by seasonal variations in the strength of the equatorial tropospheric planetary waves.b) 20th century climate variability. Possible foci are (i) drought episodes and/or (ii) the pronounced interdecadal variability of extratropical Northern Hemisphere temperature.c) Structure and dynamics of intermediate frequency (6-20 day period) variability and the degree to which it is dominated by linear Rossby-wave dynamics versus nonlinear processes such as wave breaking.In addition, this project will also explore preliminarily a strategy for quantitatively assessing the impact of global warming upon snowpack over the Pacific Northwest that is more robust with respect to sampling fluctuations than conventional analysis of trends in snowpack measurements. The temperature sensitivity of snowpack (i.e., the percentage loss in snowpack per °C temperature rise) is evaluated using four different approaches. This research will serve to promote more robust strategies for assessing the impacts of global warming, more useful measures of the impacts of global warming, understanding of mechanisms responsible for the secular trends in temperature and concentrations of trace constituents in the tropical lower stratosphere, a more definitive attribution of 20th century climate change, and a more sound phenomelogical basis for long range weather prediction.Broader impacts include the potential for improved weather and climate prediction and the training and mentoring of several graduate students.

该项目主要涵盖了气候动态广泛的三个重要研究领域：一个主要目标是确定年度周期是通过高纬度处波动活动的向上通量的变化还是通过模棱两可的对流层行星波的强度的季节性变化来迫使主要的。可能的焦点是（i）干旱事件和/或（ii）北半球外部温度的明显跨个性变化。c）结构和中等频率（6-20天周期）的变化和动态变化以及它的多样性以及由线性rossby-wave for Quartim for wave for projectim for projectim for projectim for project in strangie for projectim strangie strangie for project in strangie。全球变暖对平民西北太平洋地区的影响，在抽样波动方面比对积雪测量趋势的常规分析更强大。积雪的温度敏感性（即，每°C温度升高的积雪损失的百分比损失）使用四种不同的方法评估。这项研究将旨在促进更强大的策略，以评估全球变暖的影响，对全球变暖的影响的更有用的测量，了解负责温度安全趋势的机制以及在热带平流层中的痕量趋势一致的机制以及痕量一致的痕量一致，热带地区的属性更确定的属性，对20世纪的气候变化和更大的良好的预期范围以及较大的现象范围的预测。和几个研究生的心理。