downdraft

简明释义

英[ˈdaʊndrɑːft]美[ˈdaʊndræft]

n. 下坡，向下之气流或风

英英释义

单词用法

同义词

反义词

例句

1.Large pressure drops will lead to reduction of the gas load in downdraft gasifier, resulting in low temperature and tar production.

大型压力下降将导致在吸式气化炉燃气负荷减少，低温焦油生产造成的。

2.The temperature difference between oasis and surrounding desert drives an oasis breeze circulation, in which there is the downdraft over the oasis and the updraft over the desert.

这种温度差异使绿洲风环流产生，并且使绿洲区产生下沉运动、沙漠区产生上升运动。

3.Most cereal straws contains ash content above 10% and present slagging problem in downdraft gasifier.

大多数谷类秸秆含有10%以上，并出现在吸式气化炉灰结渣问题的内容。

4.The low level shear system, which is composed of the southward downdraft branch of upper level northern jet and the ascend branch of low level jet, is the main synoptic system.

结果表明：向南运动的高层偏北风急流下沉支与低空急流上升支组成低涡切变系统是主要影响天气系统；水汽主要来源于孟加拉湾和南海，但东部海区水汽输送也不可忽视。

5.The downdraft has hit many big investors, including executives and hedge funds.

这样的下滑已经影响了许多大的投资者，包括首席执行官和对冲基金。

6.The water vapour transport in oasis is enhanced through downdraft in terrain, making the climatic effect in oasis of mountain valley to enhance as well.

绿洲的水汽输送通过地形下沉气流加强，使山谷绿洲的气候效应得到加强。

7.Trouble is, a lot of that capital has gone away in the market downdraft of the past two years.

问题是，其中的许多资金在过去两年市场的下行中都已经损失了。

8.According to the character of IC engine and its requirement on gas quality, designed the downdraft biomass gasifier.

根据内燃式燃气发电机的性能参数和对燃气质量的要求，对下吸式生物质气化炉进行了设计。

9.The pilot had to maneuver the plane carefully due to a strong downdraft.

由于强烈的下气流，飞行员不得不小心操控飞机。

10.During the thunderstorm, the downdraft caused sudden turbulence.

在雷暴期间，下气流导致了突然的颠簸。

11.The downdraft from the mountain made it difficult for the hikers to maintain their balance.

来自山上的下气流让登山者很难保持平衡。

12.Meteorologists study downdrafts to predict severe weather conditions.

气象学家研究下气流以预测恶劣天气条件。

13.The downdraft created by the cooling system helped distribute air evenly in the room.

冷却系统产生的下气流帮助房间内的空气均匀分布。

作文

In the world of meteorology, the term downdraft refers to a downward current of air that can have significant effects on weather patterns and phenomena. Understanding how downdrafts work is essential for both meteorologists and those interested in aviation, as they can influence flight conditions and storm behavior. A downdraft occurs when warm air rises and cool air descends, creating a vertical movement in the atmosphere. This process often happens during thunderstorms, where the intense heating of the Earth’s surface leads to the rapid ascent of warm air, which is then followed by a sudden and forceful descent of cooler air.

During a thunderstorm, the formation of a downdraft can be observed when rain begins to fall. As precipitation falls, it drags cooler air down with it, creating a strong downdraft. This can lead to gusty winds at the surface, which can be hazardous for anyone outdoors. For pilots, understanding the dynamics of downdrafts is crucial because they can cause turbulence and sudden changes in altitude. A pilot encountering a downdraft may experience a rapid decrease in altitude, which can be alarming if not properly managed.

Moreover, downdrafts can also contribute to the development of microbursts, which are intense downdrafts that result in a sudden and powerful burst of wind at the surface. Microbursts can be extremely dangerous, especially for small aircraft during takeoff and landing. The unpredictability of downdrafts makes them a critical factor in flight safety. Pilots are trained to recognize the signs of potential downdrafts and to adjust their flight paths accordingly to avoid these hazardous conditions.

In addition to their impact on aviation, downdrafts play a role in the overall dynamics of storms. They can help to organize storm systems and enhance precipitation rates. When a downdraft occurs, it can lead to the development of new updrafts, perpetuating the cycle of storm development. This is particularly important for severe weather events, such as tornadoes and hurricanes, where the interaction between downdrafts and updrafts can determine the severity and longevity of the storm.

Furthermore, downdrafts can have implications beyond just weather and aviation. They can affect local ecosystems by influencing temperature and humidity levels. For example, after a rainstorm, the cooling effect of a downdraft can lead to a drop in temperature that may benefit certain plant species. Understanding this aspect of downdrafts can help ecologists predict how weather patterns might affect biodiversity in a given area.

In conclusion, the concept of downdraft is multifaceted, impacting various fields from meteorology to aviation and ecology. By studying downdrafts, we gain valuable insights into the behavior of our atmosphere and its effects on our environment. As we continue to explore and understand these phenomena, we can better prepare for the challenges they present, whether it be in flying safely through turbulent skies or predicting the outcomes of severe weather events. Knowledge of downdrafts is not just academic; it is a practical necessity for anyone who interacts with the natural world.

在气象学的世界里，术语downdraft指的是一种向下的空气流动，这种现象对天气模式和气象现象有着显著的影响。理解downdrafts的工作原理对于气象学家和航空爱好者来说都是至关重要的，因为它们会影响飞行条件和风暴行为。downdraft发生在温暖的空气上升而冷空气下降时，形成大气中的垂直运动。这一过程通常发生在雷暴期间，当地球表面被强烈加热时，温暖的空气迅速上升，随后是冷空气的突然强烈下降。

在雷暴期间，当降雨开始时，可以观察到downdraft的形成。随着降水的下落，它将较冷的空气拖拽下来，形成强烈的downdraft。这可能导致地面上的阵风，这对任何在户外的人来说都是危险的。对飞行员而言，理解downdrafts的动态至关重要，因为它们可能导致颠簸和高度的突然变化。遇到downdraft的飞行员可能会经历快速的高度下降，这在未得到妥善管理时会令人感到恐慌。

此外，downdrafts还可能促进微爆现象的形成，微爆是指一种强烈的向下气流，会在地面上造成突发和强烈的风力。微爆可能是极其危险的，尤其是在小型飞机起飞和降落时。downdrafts的不可预测性使它们成为飞行安全中的关键因素。飞行员接受过识别潜在downdrafts迹象的培训，并相应调整航线以避免这些危险条件。

除了对航空的影响外，downdrafts在风暴的整体动态中也起着作用。它们可以帮助组织风暴系统并增强降水率。当发生downdraft时，可能导致新的上升气流的发展，从而延续风暴发展的循环。这在严重天气事件（如龙卷风和飓风）中尤为重要，因为downdrafts与上升气流之间的相互作用可以决定风暴的严重性和持续时间。

此外，downdrafts还可能对生态系统产生影响，通过影响温度和湿度水平。例如，在雨后，downdraft的冷却效应可能导致温度下降，从而使某些植物物种受益。理解downdrafts的这一方面可以帮助生态学家预测天气模式如何影响特定区域的生物多样性。

总之，downdraft的概念是多方面的，影响着从气象学到航空和生态学等多个领域。通过研究downdrafts，我们获得了对大气行为及其对环境影响的宝贵见解。随着我们继续探索和理解这些现象，我们可以更好地为它们带来的挑战做好准备，无论是在平稳飞行穿越动荡的天空，还是在预测严重天气事件的结果时。对downdrafts的了解不仅仅是学术性的；它是与自然界互动的每一个人都必须具备的实用知识。