What Are Climate Trends?

Climate trend (Climatic trend), which means a climate change with a smooth and monotonous rise or fall during the recorded period.

The climatic trend is a feature of a smooth and monotonous rise or fall in a climatic element sequence. Generally, a certain trend can only be observed within a short period of time, and in a longer period of time it is a vibrational characteristic. So the climate trend is often

The characteristics of China's climate trends in the past 40 years are as follows:

1. The national average temperature is rising at a trend rate of 0.040 ° C / 10 years, and the largest temperature increase is in Northeast and North China. The annual average temperature of the middle and lower reaches of the Yangtze River, the upper and middle reaches of the Yangtze River, and the southwestern regions has a negative tendency rate, with the center between Hubei and Sichuan. In winter (January), the temperature and terrain in most parts of China have a positive tendency rate, while in summer (July), the trend rate is negative. There is a negative tendency rate.

2. The national average annual precipitation tendency is 12.66mm / 10 years. Except for the northwest region and parts of Hubei and Sichuan, precipitation is declining across the country, the most serious being North China, followed by the middle and lower reaches of the Yangtze River, Northeast and Southwest. The decrease in precipitation has made drought and desertification two prominent issues in China's climate.

However, the World Meteorological Organization and most meteorologists believe that the 30-year average can be used as the climate average for a period, so the 40-year data discussion of climate trends seems too short. Whether the above conclusions are representative remains to be further demonstrated. ^[2]