Necessary and Sufficient Reasons for Weather Change
Phenology can use phenological data for introduction and domestication. Phenological data can also help people fight pests. Phenological observation data are of practical use for beekeeping, grazing, fishing, hunting and all other economic construction related to the biological world. Phenological data can also be used to judge the local climate characteristics.
Ancient people were good at observing phenology, so what are the differences and changes between ancient and modern phenology? The following is my research.
In the Tang Dynasty, Du Mu wrote in "Mountain Walk": "Stop and sit and love the maple forest late, and the frost leaves are redder than the February flowers." This poem is about the mountain scenery in autumn, but it can be seen from "Frost leaves are red in February flowers" that February flowers are in full bloom. He Zhangzhi's "Singing Willow" in the Tang Dynasty: "I don't know who cut the thin leaves, and the spring breeze in February is like a cut." And Meng Haoran's "Looking for Nine Fragrances in Happy Wang in Spring": "The lake is clear in February, and every family sings in spring." It also shows that willows germinate in spring and February and everything recovers. Ouyang Xiu in the Northern Song Dynasty said in "The Play Answers Yuan Zhen": "Spring breeze is less than the horizon, and there are no flowers in the mountain city in February." In "Spring Farewell to the West Lake Song", it is always said: "Qian Shan is green outside the snow, and the flowers are sunny in February." Second, In the snow has been rigidized, and the flowers haven't bloomed yet, which shows that the flowers didn't bloom until February or even later in the lunar calendar in ancient times. Now winter is often warmer and flowers bloom earlier.
In the ancient spring, the spring breeze often caressed the cheeks, and the rain was crisp. "The rain in Tianjie is crisp, but the grass color is far away." "Good rain knows the season, when spring comes." In ancient times, spring rain continued, as the saying goes, "Spring rain is as expensive as oil." Now, spring is very hot, and the rain is not as intermittent as in ancient times, with frequent storms, thunder and lightning. I think everyone should have a deep understanding of this.
The migration of geese twice a year shows that they are very sensitive to weather changes. The folk song circulating in rural areas of North China goes like this: "If the seven or nine rivers can't open, the geese will always come in eight or nine miles." It shows that geese used to migrate on time every year. The poet Lu You said in the poem "Night Return": "This year, I arrived in Jiangxiang early, but I didn't see the geese flying in the Mid-Autumn Festival." The location of this poem is Shaoxing, Zhejiang. Before the Mid-Autumn Festival, the wild geese flew south, showing that the weather was already very cold. For example, Gao Shi's "Don't Move Big" in the Tang Dynasty: "Thousands of miles in Huang Yun, the daytime shines, and the north wind blows wild geese and snow." Li Bai's "A Thousand Miles": "Hu Yan was born in the horizon, and the snow is fascinated by the river." Join the Army by He Chao in the Tang Dynasty: "The Tianshan Mountains are deserted with snow, and geese come to scatter the cold." It shows that the weather outside the Great Wall is extremely cold, and it snows heavily when geese fly south. It is rare to see geese now. Liu Changchun's "No Wild Goose" shows that due to the climate change caused by human destruction, the migration of wild geese can no longer be seen, and the story about wild geese can only be read through the Yellow Pages.
These ancient and modern differences show that the temperature is higher than that in ancient times. Due to the excessive emission of carbon dioxide, the greenhouse effect is formed, which makes the global temperature warm. This makes the sea level rise. In the past 100 years, the sea level rose by 10 ~ 26 cm, of which the ocean thermal expansion led to an increase of 2 ~ 7 cm, and the rest was mainly due to the melting of land ice. If people don't take measures, a catastrophe will destroy human civilization.