Global patterns of decadal-scale variability observed in sea surface temperature and lower-tropospheric circulation fields
Global patterns of decadal-scale variability observed in sea surface temperature and lower-tropospheric circulation fields
复制标题
海面温度和对流层低层环流场观测到的十年尺度变化的全球模式
DOI：
10.1029/2000jc000619
复制
发表时间：
2001
影响因子：
--
通讯作者：
H. Nakamura
中科院分区：
文献类型：
--
作者：
T. Tomita;Bin Wang;T. Yasunari;H. Nakamura
利用近50年海温和850 hPa位势高度的实测数据，利用局地异常指数，采用滞后相关技术研究了与年代际变率（DSV）相关的全球格局。确定了三种主要模式，并检查了变异性；第一个扩展到整个太平洋，与厄尔尼诺/南方涛动（DES变异）的年代际尺度调制同步，第二个局限于局部中纬度北太平洋（LNP变异），第三个扩展到北大西洋，与北大西洋涛动（NAO）的年代际（DNA变异）同步。DES的全球海温变率在太平洋表现出大尺度赤道对称，与太平洋年代际振荡相似，但以副热带锋区信号为特征。这些海温异常伴随着副热带高压的出现，而副热带高压出现在澳大利亚周围的异常低气压之前。LNP的变异与北极涛动有关，其特征是北太平洋亚北极锋面区海温异常向东移动，并伴有阿留申低压异常。这种变异性在热带没有（有）连贯的变异性而发展（衰减）。DES变率具有6年的正交相位关系，具有24年的年代际变率。DNA变异的特征是大气NAO和北大西洋从热带到高纬度的四个纬向带的海温异常。这种可变性与DES或LNP可变性无关。
The global patterns associated with decadal-scale variability (DSV) are examined by a lag correlation technique based on local anomaly indices, using the fields of measured sea surface temperature (SST) and 850 hPa geopotential height for the last 50 years. The three dominant patterns are identified, and the variability is examined; the first spreads over the entire Pacific, which is concurrent with the decadal-scale modulation of the El Nino/Southern Oscillation (DES variability), the second is confined to the local midlatitude North Pacific (LNP variability), and the third extends over the North Atlantic with the decadal North Atlantic Oscillation (NAO) (DNA variability). The global SST pattern of DES variability exhibits large-scale equatorial symmetry in the Pacific, which is similar to that of the Pacific Decadal Oscillation but is distinguished by the signals in the subtropical frontal zones. These SST anomalies are accompanied by anomalous subtropical highs that appear prior to the anomalous depression around Australia. The LNP variability, which is related with the Arctic Oscillation, is characterized by the SST anomalies along the North Pacific subarctic frontal zone moving eastward accompanied by the anomalous Aleutian Low. This variability develops (decays) without (with) coherent variability in the tropics. It shows the 6-year quadrature phase relationship with the DES variability, indicative of an interdecadal variability with a period of 24 years. The DNA variability is featured by the atmospheric NAO and by the SST anomalies in four zonal bands that spread in the North Atlantic from the tropics to high latitudes. This variability is independent of either the DES or LNP variability.
Watanabe, M., M. Kimoto, M. Kachi, T. Nitta：“观测和耦合 GCM 中检测到的北大西洋年代际气候振荡的比较。J.气候”J。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--