Atmospheric teleconnections involving the Southern Ocean
Atmospheric teleconnections involving the Southern Ocean
复制标题
DOI：
10.1029/2000jc000379
复制
发表时间：
2003-01-23
影响因子：
3.6
通讯作者：
Carleton, AM
中科院分区：
文献类型：
--
作者：
Carleton, AM
[1]我回顾了南半球（SH）热带外大气环流低频（年际和近十年）变化的特征模式及其气候关联（例如，温度、降水、风、海面温度（SST）和海冰状况）。相当大的空间和时间的观测数据库的局限性，强烈制约了我们的理解的速度SH遥相关，特别是对太平洋部门，热带厄尔尼诺南方涛动（ENSO）发挥主导作用：ENSO信号出现在强度年际变化的阿蒙森海平均低压（ASL），急流，长波。这些变化包括所谓的太平洋-南美洲遥相关。南半球环流的低频变率主要来源于赤道外，但与ENSO相互作用，主要由纬向对称的“高纬模态”或南极涛动（AAO）控制。AAO涉及南半球中纬度和高纬度之间的大气质量交替。波数为1的纬向非对称模态由澳大利亚和南美扇区之间的气压/高度振荡表示，由“跨极地”环流指数表示。大气-海洋-冰耦合系统或南极绕极波（ACW）中的一个显著的2号波振荡与ENSO具有相似的周期性，并且在太平洋-西南大西洋扇区最强。大气遥相关涉及南大洋，包括那些厄尔尼诺现象，显示最近的变化的证据，这些气候影响进行了讨论。
[1] I review the characteristic patterns of low-frequency (interannual and subdecadal) variation in atmospheric circulation over the Southern Hemisphere (SH) extratropics and their climatic associations (e.g., temperature, precipitation, winds, sea surface temperatures (SSTs), and sea ice conditions) for the Southern Ocean. The considerable spatial and temporal limitations of the observational database have strongly conditioned the pace of our understanding of SH teleconnections, particularly for the Pacific sector, where the tropical El Nino-Southern Oscillation (ENSO) exerts a dominant influence: an ENSO signal appears in the intensity interannual variations of the Amundsen Sea mean low pressure (ASL), jet streams, and long waves. These variations comprise the so-called Pacific-South America (PSA) teleconnection. Patterns of low-frequency variability in SH circulation that are mostly extratropical in origin, but which can interact with ENSO, are dominated by the zonally symmetric "high-latitude mode" or Antarctic Oscillation (AAO). The AAO involves an alternation of atmospheric mass between middle and high southern latitudes. A zonally asymmetric mode of wave number 1 is represented by an oscillation in pressure/height between Australian and South American sectors, depicted by a "Trans-Polar" circulation index. A significant wave number 2 oscillation in the coupled atmosphere ocean - ice system or Antarctic circumpolar wave (ACW) has a similar periodicity to ENSO and is strongest in the Pacific - SW Atlantic sectors. Atmospheric teleconnections involving the Southern Ocean, including those to ENSO, show evidence of recent changes, and the climatic implications of these are discussed.