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初中地理 多变的天气 学习笔记

  • 2026-02-03 12:54:44
初中地理 多变的天气 学习笔记

🌦️ 一、天气与气候

1. 核心概念

  • 天气:指一个地区短时间内(几分钟到几天)的大气状况,特点是时刻在变

    • 描述词:阴晴、风雨、冷热、雷电等。

  • 气候:指一个地区多年的天气平均状况,特点是相对稳定

    • 描述词:四季如春、冬冷夏热、全年严寒等。

2. 快速区分

  • 看时间:短时间为天气,多年为气候。

  • 看变化:多变是天气,稳定是气候。

  • 看描述:说“今天、明天”是天气;说“某地常年”是气候。

核心区别:“天气”看“短、变”;“气候”看“长、稳”。

3. 天气与人类活动

  • 天气的影响:影响人们的穿衣、出行、交通、农业、工程建设、旅游和健康等。

  • 人类活动的影响:通过人工降雨、人工消雾、人工防霜冻等技术,可以在局部对天气进行一定程度的干预。


📡 二、天气预报

1. 主要内容

天气预报通常说明未来一段时间内的:

  • 阴晴状况:晴、多云、阴天等。

  • 气温:最高/最低气温,有时用“~”连接,如“3℃~15℃”。

  • :风向和风力。

  • 降水:降水概率(如“降水概率80%”表示下雨可能性很大)、雨势大小。

  • 其他:特殊天气预警(如台风、暴雨、寒潮等)。

2. 风向与风力

  • 风向:指风的来向。天气预报中的“北风”指风从北方吹来。基本方向有东、南、西、北、东南、西南、西北、东北。

  • 风力:指风的强弱,共分18级,级数越大,风力越强

  • 符号识别

    • 风尾:每道风尾代表2级风。

    • 风旗:一面风旗代表8级风。

3. 卫星云图

卫星云图是天气预报的重要依据,不同颜色代表不同地表和天气状况:

  • 绿色:陆地

  • 蓝色:海洋

  • 白色:云区(颜色越白,云层越厚,降水可能性越大

4. 常用天气符号

考试中常考符号的识别和判读,需熟悉以下常见符号:

  • 天气状况:晴、多云、阴、小雨、中雨、大雨、暴雨、雷阵雨、小雪、中雪、大雪、雨夹雪、雾、霜冻、沙尘暴、台风等。

  • 天气变化:用“→”连接,如“晴转多云”、“小雨转中雨”。


🍃 三、空气质量

1. 空气质量指数 (AQI)

  • 定义:空气质量的高低与空气中污染物(如PM2.5、PM10)的含量有关,用空气质量指数(AQI)来表示。

  • 判断标准:AQI数值越小,空气质量越好,对健康越有利;反之则越差。

AQI 范围

空气质量级别

对健康影响

0~50

一级

51~100

二级

101~150

三级

轻度污染

151~200

四级

中度污染

201~300

五级

重度污染

>300

六级

严重污染

2. 影响因素

  • 自然因素

    • 气压:高气压区气流下沉,污染物易堆积;低气压区气流上升,利于污染物扩散。

    • 风力:风力大,污染物易扩散;风力小,污染物易堆积。

  • 人为因素

    • 燃烧化石燃料(煤、石油)、汽车尾气、工业排放、焚烧秸秆、建筑扬尘等。

3. 改善措施

  • 绿色出行:多步行、骑自行车或乘坐公共交通。

  • 清洁能源:减少煤炭使用,推广使用清洁能源。

  • 杜绝陋习:禁止露天焚烧秸秆、垃圾等。

  • 增加绿化:植树造林,提高环境的自净能力。

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  1. CONNECT:[ UseTime:0.000870s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001373s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001146s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000723s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001092s ]
  6. SELECT * FROM `set` [ RunTime:0.007806s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001231s ]
  8. SELECT * FROM `article` WHERE `id` = 464947 LIMIT 1 [ RunTime:0.006379s ]
  9. UPDATE `article` SET `lasttime` = 1770259243 WHERE `id` = 464947 [ RunTime:0.004701s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000530s ]
  11. SELECT * FROM `article` WHERE `id` < 464947 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006364s ]
  12. SELECT * FROM `article` WHERE `id` > 464947 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015036s ]
  13. SELECT * FROM `article` WHERE `id` < 464947 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.020294s ]
  14. SELECT * FROM `article` WHERE `id` < 464947 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.039406s ]
  15. SELECT * FROM `article` WHERE `id` < 464947 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016575s ]
0.264038s