As shown in figure 1, it is the weather situation map (in hectopascals) at 8: 00 on October 24th at 2065438+China/kloc-0. Answer the question. (1) According to the number of days in Beijing in the tab

As shown in figure 1, it is the weather situation map (in hectopascals) at 8: 00 on October 24th at 2065438+China/kloc-0. Answer the question. (1) According to the number of days in Beijing in the table, (1) According to the data, the weather change in Beijing should be analyzed from three aspects: cloudy weather, temperature change and wind change: cloudy weather turns sunny, temperature drops and wind becomes stronger.

(2) According to the influence of weather system on the weather before, during and after the transit, it can be inferred from the discussed weather change (1) that the weather system affecting Beijing is a cold front. According to the movement analysis of cold and warm air masses on both sides of the cold front, Figure B in Figure 2 reflects the cold front system.

(3) Method for judging wind direction: First, draw the horizontal pressure gradient force (vertical isobar, pointing to low pressure) in Beijing, face the direction indicated by the horizontal pressure gradient force, and determine the left and right; Then according to the deflection law of horizontally moving objects, the northern hemisphere leans to the right, and draws the wind direction of Beijing (the wind direction intersects the isobar obliquely).

Judging the wind force according to the density of isobar: the isobar in Beijing is thinner than that in A, and the horizontal pressure gradient force is smaller, so the wind force is smaller than that in A. 。

(4) Judging the weather system according to the numerical distribution of isobars at B and C: the isobar at B is high in the middle and small around; Around the middle of the isobar at point C, there is low pressure.

Look at the map, the second high pressure is located in Eurasia, and the third low pressure is located in coastal areas. This pressure difference is caused by the difference of thermal properties between land and sea. Because the land heats up (cools down) faster than the ocean, and it is winter in the northern hemisphere, the land in Eurasia cools down to form a high pressure, and the coastal area correspondingly forms a low pressure.

So the answer is:

(1) Cloudy to sunny, the temperature dropped significantly, and the wind increased.

(2) Cold front? B

(3) The small isobars in the northwest are sparse, and the horizontal pressure gradient force is small.

(4) high pressure? Difference of thermal properties between low-pressure ocean and land