A Dynamical Investigation of the May 2004 McMurdo Antarctica Severe Wind Event Using AMPS
A Dynamical Investigation of the May 2004 McMurdo Antarctica Severe Wind Event Using AMPS
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使用 AMPS 对 2004 年 5 月麦克默多南极洲强风事件进行动态调查
DOI：
10.1175/2007mwr1999.1
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发表时间：
2008
影响因子：
3.2
通讯作者：
M. Lazzara
中科院分区：
文献类型：
--
作者：
D. Steinhoff;D. Bromwich;M. Lambertson;S. Knuth;M. Lazzara
2004年5月15日至16日，一场强烈的风暴袭击了南极洲的麦克默多。南极中尺度预报系统（AMPS）被用来，沿着与现有的观测，以分析风暴。天气尺度的气旋在穿越罗斯冰架向麦克默多传播时减弱。与气旋相关的气流沿沿着横贯南极山脉形成障碍急流。强迫项的水平运动方程的计算在障碍风显示当地的时间趋势和动量平流项的力量平衡的关键组成部分。障碍射流与罗斯冰架上预先存在的近地表辐射反演相互作用，为大振幅山波的发展创造了有利条件，导致罗斯岛地区的下坡风暴。水力学理论可以解释下坡风暴的结构，可能是由破波事件引起的山波放大。麦克默多的AMPS风速低估是由于下坡风暴下游的水跃错位造成的。与气旋，障碍物射流，下坡风暴的动力学进行了分析，以确定每一个在发展中的强风的作用。
On 15–16 May 2004 a severe windstorm struck McMurdo, Antarctica. The Antarctic Mesoscale Prediction System (AMPS) is used, along with available observations, to analyze the storm. A synoptic-scale cyclone weakens as it propagates across the Ross Ice Shelf toward McMurdo. Flow associated with the cyclone initiates a barrier jet along the Transantarctic Mountains. Forcing terms from the horizontal equations of motion are computed in the barrier wind to show that the local time tendency and momentum advection terms are key components of the force balance. The barrier jet interacts with a preexisting near-surface radiation inversion over the Ross Ice Shelf to set up conditions favorable for the development of large-amplitude mountain waves, leading to a downslope windstorm in the Ross Island area. Hydraulic theory can explain the structure of the downslope windstorms, with amplification of the mountain waves possibly caused by wave-breaking events. The underestimation of AMPS wind speed at McMurdo is caused by the misplacement of a hydraulic jump downstream of the downslope windstorms. The dynamics associated with the cyclone, barrier jet, and downslope windstorms are analyzed to determine the role of each in development of the severe winds.