The online map of average annual drought days in China from 1981 to 2010 comes from China Severe Weather and Climate Atlas (1961-2015). This atlas is compiled by the National Climate Center and published by the meteorological publishing house.
This atlas is compiled based on the statistics of national meteorological observation data, including 16 kinds of disastrous weather and climate graphic analysis products affecting China, including typhoon, rain and waterlogging, snow disaster, cold wave, gale, sandstorm, low temperature and cold damage, high temperature, drought, lightning, hail, frost, freezing, fog, haze and acid rain, such as the spatial distribution map of annual and seasonal occurrence frequency, the spatial distribution map of certain characteristic values, the national and regional frequency of the changes over the years (1961-2015), the national and regional frequency of the monthly changes, etc., a total of more than 300 Width.
In addition, the disaster information change maps of major meteorological disasters such as typhoon, rain and waterlogging, low-temperature freezing damage and snow disaster, drought, lightning and hail are compiled, and individual cases of major historical disaster events such as typhoon, rain and waterlogging, sandstorm, low-temperature freezing damage and snow disaster, high temperature and drought are selected. In order to facilitate readers' reading and comprehension, this atlas not only provides a large number of intuitive graphics, but also provides text descriptions of the main features.
This atlas is a reference book for understanding China's disastrous weather and climate. It can be used by business, scientific research, teaching and other personnel in the fields of meteorology, agriculture, water conservancy, geography, education, environment, land and resources, as well as by relevant departments such as disaster prevention and reduction, construction planning and so on.
Drought refers to the continuous water shortage caused by the imbalance of water revenue and expenditure or supply and demand. Drought usually includes two meanings: one is climate drought, which refers to a climate phenomenon with little precipitation for many years. The World Meteorological Organization defines areas with dryness (the ratio of annual possible Evapotranspiration to annual precipitation) greater than 10 as perennial arid areas; The second is meteorological drought, which refers to the phenomenon of surface water shortage due to the imbalance between evapotranspiration and precipitation, and the water expenditure is greater than the water income in a certain period of time. The drought analyzed in this atlas belongs to meteorological drought.
North China, Huang Huai, east northwest, West northeast, most of South China, southwest and Middle East of Inner Mongolia are drought prone areas in China. The annual drought days are generally more than 40 days, of which most of North China, northeast Huang Huai and Northern Shaanxi, most of Hedong in Gansu, Ningxia, some parts of Inner Mongolia and Western Jilin are more than 60 days. The annual drought days in the middle and lower reaches of the Yangtze River, the north of the Qinghai Tibet Plateau, the east of the northeast, most of Fujian and Western Guizhou are less than 40 days.
Online map of average spring drought days in China from 1981 to 2010
Online map of average summer drought days in China from 1981 to 2010
Online map of average autumn drought days in China from 1981 to 2010
Online map of average winter drought days in China from 1981 to 2010
Online map of the longest continuous drought days in China from 1961 to 2015
Online map of linear change trend of annual drought days from 1961 to 2015
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