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the morning and evening when the plum rain begins and emerges is closely related to the strength of the subtropical high pressure belt (hereinafter referred to as the subtropical high).

1. the formation mechanism of subtropical high pressure belt and meiyu

meiyu is a unique weather and climate phenomenon in east asia, mainly occurring in the middle and lower reaches of the yangtze river in my country and central and southern japan. its formation is closely related to atmospheric circulation systems such as the subtropical high pressure belt (hereinafter referred to as the subtropical high), the mid-latitude westerly belt, and the east asian monsoon.

usually in early summer, as the direct point of the sun moves northward, the subtropical high gradually strengthens and moves northward. the southwest warm and moist airflow on the northwest side of the subtropical high and the cold air from the north meet in the middle and lower reaches of the yangtze river to form a quasi-stationary front. due to the equal force of warm and cold air, the front swings back and forth in this area, bringing long-term rainy weather. this is the plum rain.

2. the influence of the strength of the subtropical high on the morning and evening of meiyu

1. the influence of the strength of the subtropical high on the morning and evening of plum blossoms

when the subtropical high is stronger, its northward movement will accelerate. as a result, the location where warm and cold air meet will quickly move northward to the middle and lower reaches of the yangtze river, causing the rainy season to arrive earlier. for example, if the subtropical high intensifies early and moves northward, the plum rains in the middle and lower reaches of the yangtze river may begin in early june, significantly earlier than normal.

when the subtropical high is weak, its northward movement will slow down. the location where warm and cold air meet makes it difficult to reach the middle and lower reaches of the yangtze river at the right time, resulting in a delay in the rainy season. for example, in some years, the subtropical high has been relatively weak, and the plum rains in the middle and lower reaches of the yangtze river may not start until late june or even later.

2. the influence of the strength of the subtropical high on the morning and evening of plum blossoms

when the subtropical high is strong, it can push the rain belt northward more effectively, causing the middle and lower reaches of the yangtze river to get out of the plum rain period faster, and the plum rain season may come earlier. and when the subtropical high is stronger, the rainfall during the plum rain period may be more concentrated and intense, and then the subtropical high quickly controls the area, resulting in earlier plum blossoms. comprehensive compilation by teacher tan’s geography studio

if the subtropical high is weak, the rainband may linger in the middle and lower reaches of the yangtze river for a long time, and the plum blossom season will be delayed accordingly. the weak subtropical high may also make the rainfall during the meiyu period relatively scattered and weak. however, due to the insufficient strength of the subtropical high, it is difficult to push the rain belt out quickly, resulting in the extension of the meiyu period.

generally speaking, the influence of the strength of the subtropical high pressure belt on the morning and evening of plum blossoms can be summarized as follows:if the subtropical high is strong, the plum blossoms will start early and the plum blossoms will appear early; if the subtropical high is weak, the plum blossoms will start late and the plum blossoms will appear late.

the formation and change of meiyu is a complex weather process. in addition to the strength of the subtropical high, it is also affected by a variety of other factors, such as the activity of cold air, the strength of the monsoon, and abnormalities in atmospheric circulation. therefore, the actual plum blossom onset and plum blossom onset times as well as the characteristics of the plum rain may vary from year to year, resulting in certain uncertainties and complications.

3. impact on production and life

1. the impact of early rainy season

(1) agriculture:the growth of early rice and other crops may be affected. if you encounter continuous rainy weather during the critical period of crop growth, insufficient light and high humidity will easily cause diseases and insect pests, affecting the yield and quality of crops.

(2) transportation:continuous rainfall may cause slippery roads and reduce visibility, increasing the risk of traffic accidents. at the same time, floods may damage transportation infrastructure and affect the normal operation of transportation.

(3) water conservancy facilities:the early rainy season may cause water levels in rivers and lakes to rise rapidly, putting greater pressure on water conservancy facilities. it is necessary to make preparations for flood control and drainage in advance.

2. the impact of the late rainy season

(1) agriculture:it may cause disturbance in the crop growth cycle. for example, in some areas, farmers may arrange farming activities based on the time of the annual rainy season. if the rainy season comes late, it may affect crop irrigation and fertilization plans.

(2) water resources management:the late arrival of the plum rain may lead to insufficient rainfall in the early stage and drought conditions. this requires rational allocation of water resources to meet the needs of production, living and ecological water.

(3) ecological environment:drought may affect the stability of rivers, lakes and other ecosystems, posing a threat to the survival of aquatic life. at the same time, the late rainy season may bring a large amount of precipitation in a short period of time, which may easily cause floods and cause damage to the ecological environment.

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note: this article is compiled by teacher tan’s geography studio from we all love geography, middle school geography research, middle school geography class, ingenious geography, learning geography easily, college entrance examination geography, talking about land and reasoning, lao ding talking about geography, planet geography, and so on learn geography and other geographical public accounts like this orwatermark in textwait, herethanks also! if the quotation is inappropriate, you can alwaysleave a message at the end of the articlecontact us to indicate the source or delete it.

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