Flight attendants and passengers on Air China Flight 1 were thrown to the ceiling, causing an increase in the frequency of clear sky turbulence

Tech 2023-07-12 19:12:30 Source: Network

On July 10th, some netizens reported that the CA1524 flight between Shanghai Hongqiao and Beijing Capital experienced severe turbulence in the air, causing passengers and flight attendants to be thrown to the ceiling, and the safety exit indicator light to be damaged.According to the flight standard APP, Air China CA1524 took off from Shanghai Hongqiao Airport at 15:24 on the 10th and landed at Beijing Capital International Airport at 17:18

On July 10th, some netizens reported that the CA1524 flight between Shanghai Hongqiao and Beijing Capital experienced severe turbulence in the air, causing passengers and flight attendants to be thrown to the ceiling, and the safety exit indicator light to be damaged.

According to the flight standard APP, Air China CA1524 took off from Shanghai Hongqiao Airport at 15:24 on the 10th and landed at Beijing Capital International Airport at 17:18.

Passengers on site restore a thrilling scene

On the evening of the 10th, a passenger on the flight told Jimu News that there was a small jolt 30 to 40 minutes before the plane landed. At that time, the flight attendants reminded the passengers to fasten their seat belts, and soon another very strong jolt occurred, A 40 year old female passenger and a flight attendant were thrown onto the ceiling. The flight attendant was very dedicated and protected the female passenger, and the safety exit indicator light was damaged. The passenger said that they had not yet received an explanation from the airline regarding this matter.

Xing Lida, a paleontologist who took the flight at the time of the incident, recalled that it was a thunderstorm day, and the first half of the flight was very stable. The turbulence occurred about 30 minutes before the end of the flight. At that time, there was no voice prompt in the cabin. Many people were still walking in the cabin or going to the toilet, and the plane suddenly fell and someone was thrown into the air.

Professor Xing revealed that he was watching a movie about hijacking a plane when he suddenly had an accident and felt very scary being there. The passenger next to him was injured due to not wearing his seat belt. Although he often travels by plane, he rarely encounters such intense turbulence. After landing safely, all passengers applaud for the safe landing.

According to the playback of @ Feichang, there is indeed thunderstorm weather on this route. Air China customer service responded that passengers with injuries can keep their injury certificates, and the airline will verify and handle them later.

A few years ago, I experienced the most severe turbulence on a flight to Yinchuan. The amplitude of the ups and downs and the duration of the turbulence were so significant that the feeling at that time could really be described as being completely lost

Current research generally suggests that global warming has led to an increase in clear sky turbulence. The troposphere is the layer closest to the Earth's surface in the atmosphere where we live. There are multiple layers in the atmosphere, with the stratosphere above the troposphere. The increase in greenhouse gases causes heat to be trapped in the troposphere and usually released into the stratosphere. Therefore, the stratosphere cools at a rate similar to that of the troposphere. This creates a significant temperature difference in the vertical direction of the atmosphere. As a result, the airflow becomes more chaotic and unstable, resulting in an increase in the number of encounters with clear air turbulence.

Today, the sun is shining brightly and the sky is azure. The captain just announced that the aircraft has reached cruising altitude, so the seat belt indicator light has been released. The passengers were walking around in the cabin. Suddenly, the plane began to sway. You instinctively grab the arm of the chair. The passengers who had already stood up tightly grasped the support. At the same time, a baby began to cry and shout.

One minute later, the alarm was lifted and your body relaxed, taking a deep breath. However, immediately afterwards, the plane plummeted like a stone. Your stomach hangs in your throat - but there are no thunderstorms or even clouds outside the cabin. What the hell happened here?

This is calledClear sky turbulenceThe phenomenon of "Clear air turbulence" is caused by the vortex of Jet stream all over the world. These powerful air currents circle the earth from west to east. We can see on the weather map that they are broad and wavy lines that bend with the center of Low-pressure area and High-pressure area.

As long as these airflow belts are not too far from the flight route, airlines will prefer to fly in these Jet stream belts, which can increase speed and shorten flight time.

These vortices are invisible to the naked eye, but they can cause impacts on the wings of the aircraft. When the impact is strong enough, it will cause the aircraft to suddenly bump up and down. Passengers will feel frightened, and the crew will also stumble and become unstable.40Clear sky turbulence55% increase[1].Climate model prediction,3060Clear sky turbulence100%200%..

When turbulence is present in storms or clouds, pilots can relatively easily detect their presence. Airborne radar can track the dynamics of rainfall in the distance to reveal the turbulent motion of the air. The captain can warn passengers and crew in advance, informing them to take their seats and fasten their seat belts before turbulence arrives.However,Clear sky turbulenceturbulence.

Cloud turbulence is generated by the heating effect of the sun. When dawn arrives, the sun begins to heat the ground, causing the air near the surface to warm up. These warmer air are less dense than the cooler Density of air above, so they keep rising. The replaced cold air continues to sink, and this process repeats itself, forming the so-called air convection.The rise and fall of these airflow push the wings of the aircraft, and if the thrust is strong and sudden, the aircraft will naturally sway.

Clear sky turbulence

In high altitude, when the air flows steadily horizontally, the aircraft can also fly stably. However,If the stability of the air is disrupted, it will flow in a chaotic or random mannerIn order to formturbulence.

thunderstormturbulence.thunderstormturbulence.Factors such as mountains, high altitude rapids, and temperature of the airflow around airplanesturbulence.

turbulence

|ATSB, flightsafetyAustralia

Fortunately, the aircraft is equipped withWeather radarturbulence.

Weather radar | Aircraft Science

Based on the reflected echo, the radar display will display the situation ahead in different colors:greenIndicates a slight jolt,yellowIt represents a slightly strong but controllable moderate turbulence,redIndicates that the aircraft may temporarily lose control, andred(also known asred.

Different colors correspond to different degrees of turbulence

|IntuVueRDR-4000Pilot's Guide

redred.turbulence.

The plane will bypass areas that may have severe turbulence | JxJAviation

However,Clear sky turbulenceClear-Air Turbulence, CAT.turbulence.Clear sky turbulence.

Clear sky turbulenceThe only information we have is when the plane passed by itPaul Williams.

Sometimes turbulence suddenly appears in the clear and high sky | Graeme Marlton

Clear sky turbulence.turbulence.If you don't fasten your seat belt, you will become a catapult and be ejected from your seat.

A Hawaiian Airlines plane suffered severe turbulence, and the ceiling in the cabin was broken | TaraGoodall

Clear sky turbulence

Williams and colleagues analyzed the research paper published in the Geophysical Research LettersAtmospheric data from 1979 to 2020appear.

The survey results show that since 1979,Clear sky turbulence41%.There is a clear upward trend..

Clear sky turbulence41% | [1]

Research has found that,The most significant increase in severe flight turbulence over the North Atlantic55% increase17.727.4..

55% increase | [1]

Clear sky turbulenceClear sky turbulence37%turbulence7096.1.

.10 minute joltBut Williams predicts that in decades, the time passengers will experience turbulenceIt may increase to 20 minutes or half an hour.

Clear sky turbulence| CBS

19582001Clear sky turbulence.Clear sky turbulencewinterappear..

Williams stated that based on climate change models,Clear sky turbulence.20501950winter.

Clear sky turbulence.(Can be imagined as a rectangular pipeline).However,.

By studying historical flight and weather data, Paul Williams of the University of Reading and his colleagues found that [2],19792020turbulence17%55%.turbulence(Gravitational acceleration exceeds 1g).

turbulence..

So, what does this increase mean for regular flights?

turbulence.0.1%turbulence.830turbulence..109turbulence1turbulence.

turbulence.turbulence.81015Clear sky turbulence.turbulence[3].

appear..

Reference:

[1] Agupubs. online library. wiley. com/doi/10.1029/2023GL103814

[2] Www.nature. com/articles/s41586-019-1465-z

[3] Link.springer.com/article/10.1007/s00376-017-6268-2

(Source:Bringing Science Home..

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