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Daily range
The difference between the maximum and minimum values of meteorological elements during a day and night
The difference between the maximum and minimum values of meteorological elements during a day and night.
- Chinese name
- Daily range
- Foreign name
- diurnal range
- Related terms
- Daily range
- Subject branch
- climatology
Daily range
It's a day,
Air temperature
,
Atmospheric pressure
,
humidness
The difference between the maximum and minimum values recorded in the observations of such meteorological elements is also called the daily amplitude. Daily ranges are often used to compare changes in temperature, pressure, and humidity within a day, and are often used to record historical weather conditions or to infer weather conditions for the next few days or days.
The diurnal temperature range is the most studied and the most important concept in diurnal temperature range. The diurnal temperature range is the difference between the highest temperature and the lowest temperature in a continuous 24-hour period.
The factors affecting the diurnal temperature range are latitude, season, underlying surface, terrain, weather, etc
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Latitude: The diurnal temperature range decreases with increasing latitude, because the sun's altitude Angle decreases with increasing latitude during the day. The subtropical region has the largest daily temperature range. The average daily range is about 12 ° C in the tropics, 8 ~ 9 ° C in the temperate zone and 3 ~ 4 ° C near the polar circle.
Season: the daily range is generally greater in summer than in winter, but the maximum is not in the summer solstice. This is the reason why the height Angle of the sun at noon in the summer solstice is high, but the duration of the night is short, the radiation cooling of the ground is insufficient, and the minimum temperature is not low enough. The maximum diurnal range in mid-latitudes appears in early summer and the minimum in winter.
Underlying surface: the difference of thermal conditions on the surface of the sea and land leads to the difference of daily temperature variation, and the daily temperature difference on the sea is smaller than that on the land.
Terrain: Concave terrain with a greater diurnal temperature range than convex terrain. Generally speaking, the diurnal temperature range in low depressions (such as basins and valleys) is greater than that in flat areas, and the diurnal temperature range in flat areas is greater than that in convex areas (such as hills).
Weather: The daily temperature range on cloudy days is smaller than that on sunny days, and the daily temperature range on windy days is smaller.
Terrain: The closer the place is to the ground due to being affected by the ground
Long-wave radiation
The greater the diurnal temperature range.
The diurnal pressure range is the difference between the highest and lowest pressure in a day. The diurnal pressure range is the largest near the equator, reaching 3 ~ 4 hpa. With the increase of latitude, the diurnal pressure range decreases, and it is only 0.3 ~ 0.6 hpa in the middle latitudes. The diurnal pressure range is also affected by topography.
humidness
The diurnal range is the difference between the highest and lowest humidity values in a day. In humidity, people pay more attention to relative humidity. The relative humidity mainly depends on the temperature. When the temperature increases, the surface evaporation is strengthened and the water vapor pressure increases. As the temperature increases, the relative humidity generally decreases. The highest relative humidity of the day occurs in the early morning, and the lowest value occurs at 14-15:00.
