Low-frequency Variations in the General Circulation and Climate Processes

这项研究的目的是诊断与气候动力学有关的大气环流低频变化的过程。PIs计划在年际和更长时间尺度上确定引起大气角动量（AAM）变化的机制。新获得的数据集将用于检查造成AAM ENSO异常的地表扭矩，以及地表动量源和汇与对流层上层行为的联系方式。将计算驻波活动性通量，以进一步研究热带角动量的低频变化是如何传递给温带的。负责在AAM时间序列和哈德利环流中存在的制度的区域将使用总环流数据库中的30年纬向风和经向风档案来确定。最后，Pi将更新和扩展他们对二氧化碳加倍对纬向风和AAM的影响的分析，考虑使用当前版本的环流模型进行合适的实验。这项研究很重要，因为它努力了解地球角动量的变化如何在年际和年代际时间尺度上影响大气过程。

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.