Precipitation delivery in the tropical high Andes of southern Peru: new findings and paleoclimatic implications
Precipitation delivery in the tropical high Andes of southern Peru: new findings and paleoclimatic implications
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秘鲁南部安第斯山脉热带高地的降水量：新发现和古气候影响
DOI：
10.1002/joc.3679
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
G. M. Kelly
中科院分区：
文献类型：
--
作者：
L. B. Perry;A. Seimon;G. M. Kelly
秘鲁南部安第斯山脉的维尔卡诺塔山脉是重要的研究地点，重点是从冰芯（奎尔卡亚）重建古气候，过去的冰川，气候-冰川相互作用，以及生态和人类对气候变化的反应。在这篇文章中，我们分析了2004年至2010年该地区的降水模式，每天两次降水观测从6个区域气候站和降水强度从附近的库斯科国际机场每小时观测。我们还分析了来自国家环境预测中心/国家大气研究中心（NCEP/NCAR）再分析数据集的700和200 hPa的温度，风和湿度的大气场，并使用美国国家海洋和大气管理局（NOAA）混合单粒子拉格朗日积分轨迹（HYSPLIT）模型为最严重的降水事件创建72 h的上游空气轨迹。结果表明，大部分跨山脉和山间山谷的年降水量都发生在夜间，区域连贯的降雨事件，推断为层状结构，与邻近亚马逊低地的深层潮湿对流有关。降水事件的低层水分（从先前的上游空气轨迹推断）可以从许多不同的地区提供，包括西北部和西部。轨迹分析显示，一个强大的主导地位（83%）的降水事件发生在弱流制度从附近的亚马逊流域源区，50%与来自西北部的轨迹。此外，先前在安第斯山脉中部的工作中报告的厄尔尼诺-南方涛动（ENSO）信号不一定代表维尔卡诺塔山脉，拉尼娜年（包括2007-2008年）通常略低于正常降水量，厄尔尼诺年（包括2009-2010年）则相当潮湿。这些结果是特别有价值的，在了解大气信号登记在安第斯低纬度冰芯，并指向获得更大的气候推断保存在每年的冰雪地层参数的方式。皇家气象学会
The Cordillera Vilcanota in the southern Peruvian Andes has been the site of significant research focused on paleoclimatic reconstructions from ice cores (Quelccaya), past glaciations, climate–glacier interactions, and ecological and human responses to climate change. In this article, we analyse precipitation patterns in the region from 2004 to 2010 using twice daily precipitation observations from six regional climate stations and hourly observations of precipitation intensity from nearby Cusco International Airport. We also analyse atmospheric fields of temperature, wind, and moisture at 700 and 200 hPa from the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis dataset and create 72‐h antecedent upstream air trajectories for the heaviest precipitation events using the National Oceanic and Atmospheric Administration (NOAA) Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. Results indicate that the majority of annual precipitation across the cordilleras and inter‐montane valleys alike occurs from nocturnal, regionally coherent rainfall events, inferred to be stratiform in structure, that occur in association with deep moist convection over adjacent Amazon lowlands. Low‐level moisture (as inferred from the antecedent upstream air trajectories) for precipitation events can be supplied from a number of different regions, including from the northwest and west. The trajectory analysis reveals a strong dominance (83%) of precipitation events occur under weak flow regimes from nearby Amazon basin source regions, with 50% associated with trajectories from the northwest. In addition, the El Niño‐Southern Oscillation (ENSO) signal reported in previous work in the central Andes is not necessarily representative of the Cordillera Vilcanota, where La Niña years (including 2007–2008) typically experience slightly below normal precipitation and El Niño years (including 2009–2010) are considerably wetter. These results are of particular value in understanding atmospheric signals registered in Andean low latitude ice cores, and point the way towards obtaining greater climatological inference from parameters preserved in annual snow and ice stratigraphy. Copyright © 2013 Royal Meteorological Society
影响因子：
11.6
作者：
M. Bush;Jennifer A. Hanselman;W. Gosling
通讯作者：
M. Bush;Jennifer A. Hanselman;W. Gosling