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在夏天有一个更大的昼夜温度变化因为湿度更大?

似乎有一个更大的变化在温度在夏季比冬季(图片:在英国,最大和最小的温度源)。

我的假设是,这是因为在冬天有一个更大的湿度(源——伊朗),因为在夏天,更多的水蒸发,形成云这意味着有更少的水在空气中会吸收来自太阳的能量。我正确吗?

回答

不是真的…有一些问题和你的假设。首先,它取决于你意思可变性....如果你的意思是每天高温和低温的区别,这就是你的图表显示,这的确是大夏天大多数地方(异常,[查看一个季风的地方像印度][1])。而变化也意味着每一天多冷或者多热的范围可以达到,这通常是在冬天更大(见多高行或伦敦下面图中红色区域):[![在这里输入图像描述][2]][2](来源:[ClimateCharts.net][3]),所以每天通常有较大的运动在夏季,而同比冬天往往会有更大的波动和经常周而复始的(取决于何时何地方面和风暴)但关注实际的昼夜差异,确实倾向于更大的夏天……有问题你的一些想法在水分:——云是证据表明空气中有很合理的水分……它们形成当空气搬到这一水平是“完整”的水分。他们不抢空气的水分,他们有“太多”的证据。——实际上有更多的实际空气中水蒸气在夏天在英国,以露点温度:[![enter image description here][4]][4] (Source for values: [TimeAndDate.com][5]) - Water vapor does absorb some sunlight (more than most tropospheric gases)... but is not the primary way the Earth is heated: [![enter image description here][6]][6]. (Source: [NASA education site][7]) The ground absorbs most solar energy, and then heats the air in contact with it. So water vapor absorbing sunlight isn't a big deal to the weather. It is much more important as a greenhouse gas, redirecting the ground's heat radiation back downward, both day and night. Also, clouds have a bigger impact on sunlight's energy than water vapor... because they reflect sunlight greatly (something verified by being in the sun when a cloud blocks it!) - It also can be cloudier in some places during the winter... as shown by this graph for the UK (also true for [Iran][8] and [Czechia][9]): [![enter image description here][10]][10] (Source: [Weather Spark][11]) Fog and stratus are clouds just as much as any others. Now there tends to be more bubbly cumulus in the summer, more deep convection rising through the atmosphere. But again, this isn't robbing the atmosphere of water vapor, it's an indication of a fair amount. So why is there more diurnal temperature movement during the summer? I'd suggest it's because there's a larger diurnal heating difference... in other words the sunlight is "hotter" in the summer (due to a more direct angle), and lasts longer. Then most places still cool back down to nearer the dew point at night. The extra moisture in the summer if anything dampens the diurnal range in summer (see comments about the factors). Whereas thick persistent clouds in places like London during the winter particularly tend to limit the diurnal range by cooling the daytime and warming the nighttime. [1]: https://en.wikipedia.org/wiki/Climate_of_Mumbai [2]: https://i.stack.imgur.com/cb0PQ.png [3]: https://climatecharts.net [4]: https://i.stack.imgur.com/V8Pdj.png [5]: https://www.timeanddate.com/weather/uk/london/climate [6]: https://i.stack.imgur.com/wjxN2.png [7]: https://gpm.nasa.gov/education/lesson-plans/global-energy-budget [8]: https://weatherspark.com/y/105125/Average-Weather-in-Tehran-Iran-Year-Round#Sections-Clouds [9]: https://weatherspark.com/y/77807/Average-Weather-in-Prague-Czechia-Year-Round#Sections-Clouds [10]: https://i.stack.imgur.com/TTk5b.png [11]: https://weatherspark.com/y/45062/Average-Weather-in-London-United-Kingdom-Year-Round

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\ begingroup美元我一直认为空气中的水分非常关键日较差因为它影响的比热容。但是发现它不是一个重要因素……的方程这个答案比热容+这张图表明空气的比热只改变几%干燥的空气和夏季水分之间的关系。 \ endgroup美元
- - - - - -JeopardyTempest
2021年12月19日15:26
\ begingroup美元我总是见干燥的地方像撒哈拉沙漠/亚利桑那州有巨大的昼夜范围在夏天,思考它会因为干燥…但这看起来并不真的当你看温度的范围,可以看到在维基百科上对气候表:撒哈拉沙漠…亚利桑那州 \ endgroup美元
- - - - - -JeopardyTempest
2021年12月19日15:28

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