Low-frequency Variations in the General Circulation and Climate Processes

大气环流和气候过程的低频变化

• 批准号: 9223164
• 负责人: Richard Rosen
• 金额: $ 33.22万
• 依托单位: Atmospheric and Environmental Research Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-15 至 1996-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9223164&HistoricalAwards=false
• 关键词: Low; frequency; Variations; General; Circulation

This study is aimed at diagnosing processes responsible for low-frequency variations in the general circulation of the atmosphere relevant to climate dynamics. The PIs plan to identify the mechanisms that give rise to changes in atmospheric angular momentum (AAM) on interannual and longer time scales. Newly available data sets will be used to examine the surface torques responsible for ENSO anomalies in AAM and the manner in which the surface sources and sinks of momentum are linked to behavior in the upper troposphere. Stationary wave activity fluxes will be computed to investigate further the way in which low-frequency variations in tropical angular momentum become communicated to the extratropics. Regions responsible for the presence of regimes in the AAM time series and in the Hadley circulation will be determined using the 30-year archive of zonal and meridional winds in the General Circulation Data Library. Finally, the Pi will update and extend their analysis of the impact of doubling CO2 on zonal winds and AAM by considering suitable experiments with current versions of general circulation models. This research is important because it strives to understand how variations in the earth's angular momentum affects atmospheric processes on interannual and interdecadal time scales.

这项研究旨在诊断过程负责 大气环流的低频变化 与气候动力学有关的大气。 项目负责人计划确定产生 大气角动量（AAM）的年际变化和 更长的时间尺度。 新的数据集将用于 检验造成AAM中ENSO异常的地面力矩 以及表面动量来源和吸收的方式 与对流层上层的行为有关。 驻波 活动通量将被计算，以进一步调查的方式， 热带角动量的低频变化 传送到热带以外的地方 负责区域 在AAM时间序列和Hadley中存在政权 发行量将使用30年的分区档案确定 大气环流数据库中的季风和季风。 最后，Pi将更新和扩展他们对影响的分析， 在纬向风和AAM上增加一倍的CO2， 用当前版本的大气环流模型进行实验。 这项研究很重要，因为它努力了解 地球角动量的变化如何影响大气 年际和年代际时间尺度的过程。