Identification of Surface Wind Patterns over the Ross Ice Shelf, Antarctica, Using Self-Organizing Maps
Identification of Surface Wind Patterns over the Ross Ice Shelf, Antarctica, Using Self-Organizing Maps
复制标题
DOI：
10.1175/mwr-d-13-00382.1
复制
发表时间：
2014-07-01
影响因子：
3.2
通讯作者：
Cassano, John J.
中科院分区：
文献类型：
--
作者：
Nigro, Melissa A.;Cassano, John J.
天气环流和中尺度环流与南极罗斯冰架周围陡峭地形的相互作用对罗斯冰架区域的风场有很大的影响。地形提供强迫的功能，如下降风，障碍风，障碍风角喷流。地形强迫与穿越罗斯冰架扇区的气旋产生的天气和中尺度强迫相结合，形成了一个强风但变化不定的区域。利用南极中尺度预报系统运行的天气研究和预报模型的输出和自组织地图（SOM）的方法，确定了罗斯冰架上空的主导表面风模式。该数据集有15公里的网格间距，是第一个研究，以确定主导的地面风模式，使用数据在此分辨率。分析表明，罗斯冰架气流是从大陆内部向北流过罗斯冰架西部和/或中部到达罗斯海的主要气流，大约34%的时间出现在罗斯冰架上空，罗斯冰架气流在罗斯冰架上空的强度和位置都有变化，和障碍风角喷流存在于奥拉夫王子山西北部的区域中，约占时间的14%，当罗斯冰架气流存在时，约占时间的41%。
The interaction of synoptic and mesoscale circulations with the steep topography surrounding the Ross Ice Shelf, Antarctica, greatly influences the wind patterns in the region of the Ross Ice Shelf. The topography provides forcing for features such as katabatic winds, barrier winds, and barrier wind corner jets. The combination of topographic forcing and synoptic and mesoscale forcing from cyclones that traverse the Ross Ice Shelf sector create a region of strong but varying winds. This paper identifies the dominant surface wind patterns over the Ross Ice Shelf using output from the Weather Research and Forecasting Model run within the Antarctic Mesoscale Prediction System and the method of self-organizing maps (SOM). The dataset has 15-km grid spacing and is the first study to identify the dominant surface wind patterns using data at this resolution. The analysis shows that the Ross Ice Shelf airstream, a dominant stream of air flowing northward from the interior of the continent over the western and/or central Ross Ice Shelf to the Ross Sea, is present over the Ross Ice Shelf approximately 34% of the time, the Ross Ice Shelf airstream varies in both its strength and position over the Ross Ice Shelf, and barrier wind corner jets are present in the region to the northwest of the Prince Olav Mountains approximately 14% of the time and approximately 41% of the time when the Ross Ice Shelf airstream is present.