🌍地理9⃣️ A1新学期第九课的补充材料 ☁️ Friday Fun Periods

©️Captured at 5:59pm

Near a bus station to the opposite of IKEA (Beicai)

03 March 2017, Shanghai

2017.03.03-2017.5.10

(9696 Geography)

⏳Before the A1 exam, you have 68 days to go.

今天距离地理A1考试还有：68 天

William did say the three are key terms in the Topic 2

1.evaporation

2.condensation (humidity)

3.Precipitation

(we have talked a lot about what it is but we did not talk about why it forms)

If you has some memory from 2.1, you may think of mist and fog, daytime energy budget and night budget, these terms sounds a bit familiar.

Yep, they did appear!

Today  William not  only used books to compare the process of cloud droplets getting heavier before turning into rain drops.

He also tried to draw a daily picture of this twice, one for mentioning the heavy rain around 5pm on Wednesday, and the other with cars' windows in rainy days.

下雨天你坐在爸妈的车里，观察车窗上的雨滴，下落的时候你看到第一个小雨滴，遇到第二个并到一起下落，又遇到第三个、第四个最终它们一起快速落下。

Adiabatic processes 

【物理】绝热过程

（隔绝阻止热量的散失）

Adiabatic means the rising and sinking of air. So an adiabatic process is anything that occurs as air rises or sinks.

_as air rises it cools and can hold less water

_as air sinks it warms and can hold more water

When a parcel of air holds the max amount of moisture it can, it is called saturated.

The point at which a parcel of air is saturated is known as dew point

That is captured from a university website, that’s college students’ handwriting notes. source: http://www.atmo.arizona.edu/students/courselinks/spring08/nats101s33/lecture_notes/1st_day_composition.html

The altitude at which dew pint is reached is known as (lifted) condensation level

lifted condensation level(LCL) in  real life ⬆️

Most of our drawings ⬇️

ELR_

environmental lapse rate

on average the ERC decreases 6℃ per 1000m

DALR

DRY Adiabatic lapse rate

parcels of dry (unsaturated) air cools at a higher rate than the surrounding air (about 10'C per 1000m)

SALR

Saturated ALR

4-9℃ per 1000m

IMPORTANT:

The air that is rising up is very different from the air which is already there/ surrounding temperature.

Q:

When does a parcel of air stop rising?

A:

Air will continue to rise and cool until it reaches the same temperature as the surrounding air.

We also mentioned stability and instability in the air, let's see if the pictures can be helpful:

warm air wants to go up, but cold air wants to go down.

That is how a hot air balloon (or fire balloon) works.

Classwork: let's try to finish P42 activities.

Before we had lunch, we learned about cloud types.

You need to know it is not classified by colors, you need to identify the main types of cloud through three critieria.

A cloud a visible mass of condensed water vapour or ice particles floating in the atmosphere, typically high above the ground.

source: https://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Object/Cloud_Gen

Clouds are classified according to three criteria:

1 altitude

2 shape

3 whether they bring precipitation

For example, clouds below 2,000m are low-level clouds, (cloud droplets are made of water), clouds appearing between 2000m and 6000m are mid-level clouds (mixture of ice and water), while clouds above 6000m are called high-level clouds ( prefix c ice crystals).

Best news ever:

Next Wednesday, we will finish 2.3 and have a quiz.

Night 62/365

Year 2017