Secular trend of the equilibrium-line altitude on the western side of the southern Andes, derived from radiosonde and surface observations
Secular trend of the equilibrium-line altitude on the western side of the southern Andes, derived from radiosonde and surface observations
复制标题
根据无线电探空仪和地面观测得出的安第斯山脉南部西侧平衡线高度的长期趋势
DOI：
10.3189/002214308785837002
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发表时间：
2008
影响因子：
3.4
通讯作者：
G. Casassa
中科院分区：
文献类型：
--
作者：
Jorge Carrasco;R. Osório;G. Casassa
摘要 分析了从智利航空站安托法加斯塔、金特罗/圣多明各、蒙特港和蓬塔阿雷纳斯的无线电探空仪数据获得的 0°C 等温线的高度，以及附近站的表面温度和降水记录。太平洋年代际振荡的变化导致 1976/77 年气候变化的强烈影响在温度和降水数据中显而易见。这些数据用作经验模型的输入，该模型每年重建安第斯山脉南部西侧过去 49 年的平衡线高度 (ELA)。该模型以气温、降水量和海拔高度为主要参数，最初由Fox（1993）提出，并由Condom等（2007）应用。从探空仪数据来看，北部、中部和南部地区的0℃等温线出现了显着的正向趋势，表明由于区域变暖导致ELA上升。过去几十年在几乎所有智利安第斯山脉观察到的普遍冰川退缩、冰层变薄和负质量平衡与观察到的 ELA 重建一致。在蓬塔阿雷纳斯无线电探空仪记录中，有少量证据表明降水量增加，但没有证据表明过去几十年有明显变暖。根据模型重建，这导致 ELA 略有降低，这与巴塔哥尼亚近几十年来观察到的强烈且增加的冰川退缩并不相符。
Abstract The altitude of the 0°C isotherm obtained from radiosonde data of the aerological Chilean stations Antofagasta, Quintero/Santo Domingo, Puerto Montt and Punta Arenas are analyzed, along with surface temperature and precipitation records from nearby stations. The strong effect of the 1976/77 climate shift due to a change in the Pacific Decadal Oscillation is evident in the temperature and precipitation data. The data are used as input for an empirical model which reconstructs annually the equilibrium-line altitude (ELA) for the last 49 years on the western side of the southern Andes. The model takes air temperature, precipitation and altitude as the main parameters, and was first developed by Fox (1993) and applied by Condom and others (2007). From the radiosonde data, a significant positive trend of the 0°C isotherm has occurred in the northern, central and southern regions, indicating an ELA rise due to regional warming. General glacier retreat, ice thinning and negative mass balance observed during the past few decades in virtually all the Chilean Andes concur with the observed ELA reconstruction. In the Punta Arenas radiosonde record there is slight evidence for precipitation increase but no evidence for significant warming in the past few decades. This results in a slight lowering of the ELA according to the model reconstruction, which does not agree with the strong and increased glacier retreat observed in recent decades in Patagonia.
影响因子：
3.9
作者：
Rasmussen, L. A.;Conway, H.;Raymond, C. F.
通讯作者：
Raymond, C. F.