Summer Climate Prediction in Hanzhong 20 16

Hanzhong belongs to the subtropical climate zone, with Qinling barrier in the north, which is not easy to be attacked by cold current and has a mild and humid climate. [5]

Temperature: The geographical distribution of temperature in this area is mainly controlled by topography. The annual average temperature is 65438 04℃. The west is slightly lower than the east, and the north and south mountainous areas are lower than the flat dams and hills. The annual average temperature in Pingba area below 600 meters above sea level is14.2 ~14.6℃; The average annual temperature in areas above1000m is lower than12℃; The annual average temperature in the western valley of Jialing River is higher than 65438 03℃. [5]

Precipitation: Hanzhong is located in the mid-latitude of the northern hemisphere, forming a warm and humid airflow of annual precipitation, mainly from the Bay of Bengal in the Indian Ocean, followed by the western Pacific Ocean. In summer, under the influence of the subtropical high, the water vapor in the Bay of Bengal flows northward along the southwest monsoon in the lower part of the southwest vortex, passing through Tibet, Yunnan and northwest Sichuan, reaching over this area. The water vapor in the western Pacific enters this area with the southeast airflow at the edge of subtropical high. Winter is controlled by the polar continental cold air mass (mainly Mongolian high pressure), and there are many northwest monsoon, which leads to cold, dry and little rain. Spring and autumn are transitional seasons, with warm and little rain in spring, cool and rainy in autumn and humid climate. Water vapor evaporated in space by ground vegetation, reservoirs, rivers and pastoral areas. Almost no participation in precipitation. The warm and humid airflow from the southwest and southeast is blocked by Bashan and Qinling Mountains, which makes the region abundant in rainfall. However, because these two mountains are located in the path of southwest airflow,

Due to the convergence of water vapor system in the middle and lower clouds and the vertical influence of topographic uplift and mountains, the water vapor in the Shimen plank road in Hanzhong is uneven between the north and the south, and the precipitation distribution is very different. The average precipitation for many years is between 700 ~ 1700 mm, of which Micang Mountain in the south is the most abundant and the highest in Shaanxi. [5]

Humidity: The distribution trend of annual average relative humidity in the whole Hanzhong area is basically from the south to the north. 70-80% of Hanjiang and Bashan Pingba; Qinling 73%. It is smaller in winter and spring and larger in summer and autumn. The month of 9. 10 is the highest in the whole year, with 80% ~ 86%. In winter (12, 1, February), 75% ~ 80% is in Pingba and Bashan mountain areas of Hanjiang River; 58%~66% of the Qinling Mountains.