Abstract
Low-level wind shear is a hazardous phenomenon for aircraft, a low-level wind shear case of Xining airport selected from pilot reports is analysed in this paper. Using ERA-Interim data, the weather pattern and characteristics of wind distribution are discussed. The result indicates cold high pressure accompanied by strong wind and terrain is the main reason of this low-level wind shear case.
Highlights
Low-level wind shear is a change in wind speed and/or direction in space below 500 meters (1,600 ft), including updrafts and downdrafts
Based on the PIREPs, there was a low-level wind shear occur at Xining Airport on the 3rd March, 2014
The weather pattern at low level shows that there is a high-pressure region in northwest China, Xining airport is in the front of high pressure (Fig.1.a)
Summary
Low-level wind shear is a change in wind speed and/or direction in space below 500 meters (1,600 ft), including updrafts and downdrafts. The aircraft may change airspeed, lift force and altitude suddenly and even get out of control when encounter low-level wind shear [2]. If the aircraft encounter cross wind shear, it will veer off the runway Because it is a small scale, it happens suddenly and its duration is short, to observe and forecast low-level wind shear is difficult. A low-level wind shear case of Qinghai Xining Airport located in the northwest China is analysed. PIREP is a report from pilot who encounter some hazard weather phenomena, such as low-level wind shear, moderate to severe aircraft icing and turbulence etc., to other pilots or air traffic controllers. The case is selected from PIREPs of low-level wind shear in Xining Airport
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