On the Linkages between the Tropospheric Isentropic Slope and Eddy Fluxes of Heat during Northern Hemisphere Winter
On the Linkages between the Tropospheric Isentropic Slope and Eddy Fluxes of Heat during Northern Hemisphere Winter
复制标题
北半球冬季对流层等熵斜率与热涡流之间的联系
DOI：
10.1175/jas-d-11-0187.1
复制
发表时间：
2012
影响因子：
3.1
通讯作者：
T. Birner
中科院分区：
文献类型：
--
作者：
D. Thompson;T. Birner
摘要以往的研究已经证明了斜压性和等熵斜率在确定对流层热涡通量的气候平均分布中的关键作用。在这里，作者研究了等熵斜率的变率在驱动北半球冬季对流层热涡通量的长期平均值变化中的作用。在逐月时间尺度上，当所有涡旋都纳入分析时，对流层下层等熵斜率和涡旋热通量的相关性不显著。但是，当对数据进行过滤以分离天气（10天）时间尺度波引起的通量时，等熵斜率和热通量密切相关。异常陡等熵坡的特征是天气涡旋引起的异常极向热通量，低频涡旋引起的异常赤道向热通量。基于每日数据的滞后回归表明：1)等熵斜率的变化先于…
AbstractPrevious studies have demonstrated the key role of baroclinicity and thus the isentropic slope in determining the climatological-mean distribution of the tropospheric eddy fluxes of heat. Here the authors examine the role of variability in the isentropic slope in driving variations in the tropospheric eddy fluxes of heat about their long-term mean during Northern Hemisphere winter.On month-to-month time scales, the lower-tropospheric isentropic slope and eddy fluxes of heat are not significantly correlated when all eddies are included in the analysis. But the isentropic slope and heat fluxes are closely linked when the data are filtered to isolate the fluxes due to synoptic ( 10 days) time scale waves. Anomalously steep isentropic slopes are characterized by anomalously poleward heat fluxes by synoptic eddies but anomalously equatorward heat fluxes by low-frequency eddies. Lag regressions based on daily data reveal that 1) variations in the isentropic slope precede by ...