Intra- to multidecadal variations of snowpack and streamflow records in the Andes of Chile and Argentina between 30° and 37°S.
Intra- to multidecadal variations of snowpack and streamflow records in the Andes of Chile and Argentina between 30° and 37°S.
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DOI：
10.1175/2010jhm1191.1
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发表时间：
2010-06
影响因子：
3.8
通讯作者：
M. Masiokas;R. Villalba;B. Luckman;S. Mauget
中科院分区：
文献类型：
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作者：
M. Masiokas;R. Villalba;B. Luckman;S. Mauget
在最近的一项研究中，作者利用智利和阿根廷的资料，首次建立了安第斯山脉30° ~ 37°S积雪和径流的区域平均跨国记录。这项研究的主要目的是评价区域积雪记录的年际变化与大尺度大气变量和指数之间的关系。在这里，重点是在冬季积雪和平均年河流流量的更新记录的主要内部到几十年的变化。安第斯山脉两侧的河流流量显示出类似的时间变化，极端干旱条件集中在20世纪40年代中期和1976/77年之间，极端潮湿条件在20世纪70年代末和80年代之间达到峰值。一个区域流量合成（1906-2007年）有一个不显着的负趋势，但显着的制度转变，在1945年，当平均水平下降31%，并在1977年时，他们增加了28%。这些事件几乎与太平洋年代际振荡（PDO）中众所周知的变化完全一致。
Abstract In a recent study the authors developed the first regionally averaged, transnational records of snowpack and streamflow for the Andes between 30° and 37°S using Chilean and Argentinean data. That study was mainly intended to evaluate the relationships between the interannual variations in the regional snowpack record and large-scale atmospheric variables and indices. Here the focus is on the main intra- to multidecadal variations in updated records of winter snowpack and mean annual river flows. River discharges show similar temporal variations on both sides of the Andes with extreme dry conditions concentrated between the mid-1940s and 1976/77 and extreme wet conditions peaking between the late 1970s and the 1980s. A regional streamflow composite (1906–2007) has a nonsignificant negative trend but significant regime shifts in 1945, when mean levels dropped 31%, and in 1977 when they increased 28%. These events coincide almost exactly with well-known shifts in the Pacific decadal oscillation (PDO...