Adrought is a period of drier-than-normal conditions.[1]: 1157 A drought can last for days, months or years. Drought often has large impacts on theecosystems andagriculture of affected regions, and causes harm to the localeconomy.[2][3] Annual dry seasons in thetropics significantly increase the chances of a drought developing, with subsequent increasedwildfire risks.[4]Heat waves can significantly worsen drought conditions by increasingevapotranspiration.[5] This dries out forests and other vegetation, and increases the amount of fuel for wildfires.[4][6]
Drought is a recurring feature of the climate in most parts of the world, becoming more extreme and less predictable due toclimate change, whichdendrochronological studies date back to 1900. There are three kinds of drought effects, environmental, economic and social. Environmental effects include the drying ofwetlands, more and larger wildfires,loss of biodiversity.
Economic impacts of drought result due to negative disruptions toagriculture and livestock farming (causingfood insecurity), forestry, publicwater supplies, river navigation (due to e.g.: lower water levels), electric power supply (by affectinghydropower systems) and impacts on human health.[7]
Social and health costs include the negative effect on the health of people directly exposed to this phenomenon (excessive heat waves), high food costs, stress caused by failed harvests,water scarcity, etc. Drought can also lead to increasedair pollution due to increased dust concentrations andwildfires.[8] Prolonged droughts have causedmass migrations andhumanitarian crisis.[9][10]
Examples for regions with increased drought risks are theAmazon basin,Australia, theSahel region andIndia. For example, in 2005, parts of theAmazon basin experienced the worst drought in 100 years.[11][12] Australia could experience more severe droughts and they could become more frequent in the future, a government-commissioned report said on July 6, 2008.[13] The long AustralianMillennial drought broke in 2010. The2020–2022 Horn of Africa drought surpassed the severe drought in 2010–2011 in both duration and severity.[14][15]
Throughout history, humans have usually viewed droughts asdisasters due to the impact on food availability and the rest of society. People have viewed drought as anatural disaster or as something influenced byhuman activity, or as a result ofsupernatural forces.
Definition
Fields outsideBenambra, Australia suffering from drought in 2006.
TheIPCC Sixth Assessment Report defines a drought simply as "drier than normal conditions".[1]: 1157 This means that a drought is "a moisture deficit relative to the average water availability at a given location and season".[1]: 1157
According toNational Integrated Drought Information System, a multi-agency partnership, drought is generally defined as "a deficiency of precipitation over an extended period of time (usually a season or more), resulting in a water shortage". The National Weather Service office of theNOAA defines drought as "a deficiency of moisture that results in adverse impacts on people, animals, or vegetation over a sizeable area".[16]
Drought is a complex phenomenon − relating to the absence of water − which is difficult to monitor and define.[17] By the early 1980s, over 150 definitions of "drought" had already been published.[18] The range of definitions reflects differences in regions, needs, and disciplinary approaches.
Categories
There are three major categories of drought based on where in the water cycle the moisture deficit occurs: meteorological drought, hydrological drought, and agricultural or ecological drought.[1]: 1157 A meteorological drought occurs due to lack ofprecipitation. A hydrological drought is related to low runoff, streamflow, and reservoir and groundwater storage.[19] An agricultural or ecological drought is causing plant stress from a combination of evaporation and lowsoil moisture.[1]: 1157 Some organizations add another category: socioeconomic drought occurs when the demand for an economic good exceeds supply as a result of a weather-related shortfall in water supply.[17][18] The socioeconomic drought is a similar concept towater scarcity.
The different categories of droughts have different causes but similar effects:
Meteorological drought occurs when there is a prolonged time with less than average precipitation.[20] Meteorological drought usually precedes the other kinds of drought.[21] As a drought persists, the conditions surrounding it gradually worsen and its impact on the local population gradually increases.
Hydrological drought happens when water reserves available in sources such asaquifers,lakes andreservoirs fall below average or alocally significant threshold. Hydrological drought tends to present more slowly because it involves stored water that is used but not replenished. Due to the close interaction with water use, this type of drought is can be heavily influenced bywater management. Both positive and negative human influences have been discovered and strategic water management strategies seem key to mitigate drought impact.[22][23] Like agricultural droughts, hydrological droughts can be triggered by more than just a loss of rainfall. For instance, around 2007Kazakhstan was awarded a large amount of money by theWorld Bank to restore water that had been diverted to other nations from theAral Sea underSoviet rule.[24] Similar circumstances also place their largest lake,Balkhash, at risk of completely drying out.[25]
Agricultural or ecological droughts affect crop production orecosystems in general. This condition can also arise independently from any change in precipitation levels when either increasedirrigation orsoil conditions and erosion triggered by poorly planned agricultural endeavors cause a shortfall in water available to the crops.
Indices and monitoring
Percent of U.S. experiencing drought intensity of at least level D2 (severe drought), during the weeks of 2000 to 2024.
Several indices have been defined to quantify and monitor drought at different spatial and temporal scales. A key property of drought indices is their spatial comparability, and they must be statistically robust.[26] Drought indices include:[26]
Palmer drought index (sometimes called the Palmer drought severity index (PDSI)): a regional drought index commonly used for monitoring drought events and studying areal extent and severity of drought episodes.[27] The index uses precipitation and temperature data to study moisture supply and demand using a simple water balance model.[27][28][29]
Standardized precipitation index (SPI): It is computed based on precipitation, which makes it a simple and easy-to-apply indicator for monitoring and prediction of droughts in different parts of the world. TheWorld Meteorological Organization recommends this index for identifying and monitoring meteorological droughts in different climates and time periods.[26]
Standardized Precipitation Evapotranspiration Index (SPEI): a multiscalar drought index based on climatic data. The SPEI accounts also for the role of the increased atmosphericevaporative demand on drought severity.[26] Evaporative demand is particularly dominant during periods of precipitation deficit. The SPEI calculation requires long-term and high-quality precipitation and atmospheric evaporative demand datasets. These can be obtained from ground stations or gridded data based on reanalysis as well as satellite and multi-source datasets.[26]
Indices related to vegetation: root-zone soil moisture, vegetation condition index (VDI) and vegetation health index (VHI). The VCI and VHI are computed based on vegetation indices such as the normalized difference vegetation index (NDVI) and temperature datasets.[26]
Deciles index
Standardized runoff index
High-resolution drought information helps to better assess the spatial and temporal changes and variability in drought duration, severity, and magnitude at a much finer scale. This supports the development of site-specific adaptation measures.[26]
The application of multiple indices using different datasets helps to better manage and monitor droughts than using a single dataset, This is particularly the case in regions of the world where not enough data is available such as Africa and South America. Using a single dataset can be limiting, as it may not capture the full spectrum of drought characteristics and impacts.[26]
Careful monitoring of moisture levels can also help predict increased risk for wildfires.
Causes
Contraction and desiccation cracks in the dry earth of theSonoran Desert, northwestern Mexico
Mechanisms of producing precipitation includeconvective,stratiform,[31] andorographic rainfall.[32] Convective processes involve strong vertical motions that can cause the overturning of the atmosphere in that location within an hour and cause heavy precipitation,[33] while stratiform processes involve weaker upward motions and less intense precipitation over a longer duration.[34]
Precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice.
Droughts occur mainly in areas where normal levels of rainfall are, in themselves, low. If these factors do not support precipitation volumes sufficiently to reach the surface over a sufficient time, the result is a drought. Drought can be triggered by a high level of reflected sunlight and above average prevalence of highpressure systems,winds carrying continental, rather than oceanic air masses, and ridges ofhigh pressure areas aloft can prevent or restrict the developing of thunderstorm activity or rainfall over one certain region. Once a region is within drought, feedback mechanisms such as local arid air,[35] hot conditions which can promote warm core ridging,[36] and minimal evapotranspiration can worsen drought conditions.
Within the tropics, distinct,wet and dryseasons emerge due to the movement of theIntertropical Convergence Zone orMonsoon trough.[37] The dry season greatly increases drought occurrence,[38] and is characterized by its low humidity, with watering holes and rivers drying up. Because of the lack of these watering holes, many grazing animals are forced to migrate due to the lack of water in search of more fertile lands. Examples of such animals arezebras,elephants, andwildebeest. Because of the lack of water in the plants, bushfires are common.[39] Since water vapor becomes more energetic with increasing temperature, more water vapor is required to increase relative humidity values to 100% at higher temperatures (or to get the temperature to fall to the dew point).[40] Periods of warmth quicken the pace of fruit and vegetable production,[41] increase evaporation and transpiration from plants,[42] and worsen drought conditions.[43]
TheEl Niño–Southern Oscillation (ENSO) phenomenon can sometimes play a significant role in drought. ENSO comprises two patterns of temperature anomalies in the centralPacific Ocean, known asLa Niña andEl Niño. La Niña events are generally associated with drier and hotter conditions and further exacerbation of drought inCalifornia and theSouthwestern United States, and to some extent theU.S. Southeast. Meteorological scientists have observed that La Niñas have become more frequent over time.[44]
Conversely, during El Niño events, drier and hotter weather occurs in parts of theAmazon River Basin,Colombia, andCentral America. Winters during the El Niño are warmer and drier than average conditions in the Northwest, northern Midwest, and northern Mideast United States, so those regions experience reduced snowfalls. Conditions are also drier than normal from December to February in south-central Africa, mainly inZambia,Zimbabwe,Mozambique, andBotswana. Direct effects of El Niño resulting in drier conditions occur in parts ofSoutheast Asia andNorthern Australia, increasingbush fires, worseninghaze, and decreasing air quality dramatically. Drier-than-normal conditions are also in general observed inQueensland, inlandVictoria, inlandNew South Wales, and easternTasmania from June to August. As warm water spreads from the west Pacific and theIndian Ocean to the east Pacific, it causes extensive drought in the western Pacific. Singapore experienced the driest February in 2014 since records began in 1869, with only 6.3 mm of rain falling in the month and temperatures hitting as high as 35 °C on 26 February. The years 1968 and 2005 had the next driest Februaries, when 8.4 mm of rain fell.[45]
There will likely be multiplicative increases in the frequency ofextreme weather events compared to the pre-industrial era forheat waves, droughts and heavy precipitation events, for various climate change scenarios.[46]
Globally, the occurrence of droughts has increased as a result of theincrease in temperature and atmosphericevaporative demand. In addition, increasedclimate variability has increased the frequency and severity of drought events. Moreover, the occurrence and impact of droughts are aggravated by anthropogenic activities such as land use change and water management and demand.[26]
TheIPCC Sixth Assessment Report also pointed out that "Warming over land drives an increase in atmospheric evaporative demand and in the severity of drought events"[47]: 1057 and "Increased atmospheric evaporative demand increases plant water stress, leading to agricultural and ecological drought".[48]: 578
There is a rise of compound warm-season droughts in Europe that are concurrent with an increase in potentialevapotranspiration.[49]
Climate change affects many factors associated with droughts. These include how much rain falls and how fast the rainevaporates again. Warming over land increases the severity and frequency of droughts around much of the world.[50][51]: 1057 In some tropical and subtropical regions of the world, there will probably be less rain due to global warming. This will make them more prone to drought. Droughts are set to worsen in many regions of the world. These include Central America, the Amazon and south-western South America. They also include West and Southern Africa. The Mediterranean and south-western Australia are also some of these regions.[51]: 1157
Higher temperatures increase evaporation. This dries the soil and increasesplant stress. Agriculture suffers as a result. This means even regions where overall rainfall is expected to remain relatively stable will experience these impacts.[51]: 1157 These regions include central and northern Europe. Without climate change mitigation, around one third of land areas are likely to experience moderate or more severe drought by 2100.[51]: 1157 Due to global warming droughts are more frequent and intense than in the past.[52]
Several social factors may worsen the impact of droughts. These are increased water demand, population growth and urban expansion in many areas.[53]Land restoration techniques, such asagroforestry, can help reduce the impact of droughts.[54]
Human activity can directly trigger exacerbating factors such as over-farming, excessiveirrigation,[55]deforestation, anderosion adversely impact the ability of the land to capture and hold water.[56] In arid climates, the main source of erosion is wind.[57] Erosion can be the result of material movement by the wind. The wind can cause small particles to be lifted and therefore moved to another region (deflation). Suspended particles within the wind may impact on solid objects causing erosion by abrasion (ecological succession). Wind erosion generally occurs in areas with little or no vegetation, often in areas where there is insufficient rainfall to support vegetation.[58]Woody plant encroachment can increase soil porosity and therewith the chances of soil drought.[59][60]
Drought is one of the most complex and majornatural hazards, and it has devastating impacts on the environment, economy, water resources, agriculture, and society worldwide.[26]
One can divide the impacts of droughts and water shortages into three groups: environmental, economic and social (including health).
Environmental and economic impacts
Western red cedar dying from drought, US, 2018
Environmental effects of droughts include: lower surface and subterranean water-levels, lower flow-levels (with a decrease below the minimum leading to direct danger for amphibian life), increasedpollution of surface water, the drying out ofwetlands, more and largerwildfires, higher deflation intensity,loss of biodiversity, worse health of trees and the appearance of pests and dendroid diseases.[61][6] Drought-induced mortality of trees lacks in mostclimate models in their representation of forests asland carbon sink.[62]
Economic losses as a result of droughts include lower agricultural, forests, game and fishing output, higher food-production costs, lower energy-production levels in hydro plants, losses caused by depleted water tourism and transport revenue, problems with water supply for theenergy sector and for technological processes in metallurgy, mining, the chemical, paper, wood, foodstuff industries etc., disruption ofwater supplies for municipal economies.
Further examples of common environmental and economic consequences of drought include:
Impacts of climate change on soil moisture at 2 °C of global warming. A reduction of onestandard deviation means that average soil moisture will approximate the ninth driest year between 1850 and 1900.
Droughts can cause land degradation and loss of soil moisture, resulting in the destruction of cropland productivity.[70] This can result in diminishedcrop growth or yield productions andcarrying capacity forlivestock. Drought in combination with high levels of grazing pressure can function as the tipping point for an ecosystem, causingwoody encroachment.[71]
Water stress affects plant development and quality in a variety of ways: firstly drought can cause poor germination and impaired seedling development.[72] At the same time plant growth relies on cellular division, cell enlargement, and differentiation. Drought stress impairsmitosis and cell elongation via loss ofturgor pressure which results in poor growth.[73] Development of leaves is also dependent upon turgor pressure, concentration of nutrients, and carbon assimilates[clarification needed] all of which are reduced by drought conditions, thus drought stress lead to a decrease in leaf size and number.[73] Plant height, biomass, leaf size and stem girth has been shown to decrease in maize under water limiting conditions.[73] Crop yield is also negatively effected by drought stress, the reduction in crop yield results from a decrease in photosynthetic rate, changes in leaf development, and altered allocation of resources all due to drought stress.[73] Crop plants exposed to drought stress suffer from reductions in leaf water potential and transpiration rate.Water-use efficiency increases in crops such as wheat while decreasing in others, such as potatoes.[74][75][73]
Plants need water for the uptake of nutrients from the soil, and for the transport of nutrients throughout the plant: drought conditions limit these functions leading to stunted growth. Drought stress also causes a decrease in photosynthetic activity in plants due to the reduction of photosynthetic tissues, stomatal closure, and reduced performance of photosynthetic machinery. This reduction in photosynthetic activity contributes to the reduction in plant growth and yields.[73] Another factor influencing reduced plant growth and yields include the allocation of resources; following drought stress plants will allocate more resources to roots to aid in water uptake increasing root growth and reducing the growth of other plant parts while decreasing yields.[73]
There are negative effects on the health of people who are directly exposed to this phenomenon (excessiveheat waves). Droughts can also cause limitations of water supplies, increased water pollution levels, high food-costs, stress caused by failed harvests,water scarcity, etc. Reduced water quality can occur because lower water-flows reduce dilution of pollutants and increasecontamination of remaining water sources.[76][77]
This explains why droughts and water scarcity operate as a factor which increases the gap betweendeveloped anddeveloping countries.[78]
Effects vary according to vulnerability. For example, subsistence farmers are more likely to migrate during drought because they do not have alternative food-sources. Areas with populations that depend on water sources as a major food-source are more vulnerable to famine.
People displaced by a drought inSomalia arriving at a camp inDolo Ado, Ethiopia, 2011
Further examples of social and health consequences include:
War over natural resources, including water and food
Cyanotoxin accumulation within food chains and water supply (some of which are among the most potent toxins known to science) can cause cancer with low exposure over the long term.[80] High levels ofmicrocystin appeared inSan Francisco Bay Area salt-water shellfish and fresh-water supplies throughout the state of California in 2016.
Severe drought has been noted to cause unrest and precede in some cases periods of political upheaval.[81][82]
Wind erosion is much more severe in arid areas and during times of drought. For example, in theGreat Plains, it is estimated that soil loss due to wind erosion can be as much as 6100 times greater in drought years than in wet years.[83]
Loess is a homogeneous, typically nonstratified, porous,friable, slightly coherent, often calcareous, fine-grained,silty, pale yellow or buff, windblown (Aeolian)sediment.[84] It generally occurs as a widespread blanket deposit that covers areas of hundreds of square kilometers and tens of meters thick. Loess often stands in either steep or vertical faces.[85] Loess tends to develop into highly rich soils. Under appropriate climatic conditions, areas with loess are among the most agriculturally productive in the world.[86] Loess deposits are geologically unstable by nature, and will erode very readily. Therefore, windbreaks (such as big trees and bushes) are often planted by farmers to reduce the wind erosion of loess.[57]
In 2005, parts of theAmazon basin experienced the worst drought in 100 years.[11][12] A 2006 article reported results showing that the forest in its present form could survive only three years of drought.[87][88] Scientists at the BrazilianNational Institute of Amazonian Research argue in the article that this drought response, coupled with the effects ofdeforestation on regional climate, are pushing the rainforest towards a "tipping point" where it would irreversibly start to die. It concludes that therainforest is on the brink of being turned intosavanna ordesert, with catastrophic consequences for the world's climate. According to theWWF, the combination ofclimate change and deforestation increases the drying effect of dead trees that fuels forest fires.[89]
The 1997–2009Millennium Drought in Australia led to a water supply crisis across much of the country. As a result, many desalination plants were built for the first time (see list).
By far the largest part ofAustralia isdesert or semi-arid lands commonly known as theoutback. A 2005 study by Australian and American researchers investigated the desertification of the interior, and suggested that one explanation was related tohuman settlers who arrived about 50,000 years ago. Regular burning by these settlers could have preventedmonsoons from reaching interior Australia.[90] In June 2008 it became known that an expert panel had warned of long term, maybe irreversible, severe ecological damage for the wholeMurray-Darling basin if it did not receive sufficient water by October 2008.[91] Australia could experience more severe droughts and they could become more frequent in the future, a government-commissioned report said on July 6, 2008.[13] Australian environmentalistTim Flannery, predicted that unless it made drastic changes,Perth inWestern Australia could become the world's firstghost metropolis, an abandoned city with no more water to sustain its population.[92] The long AustralianMillennial drought broke in 2010.
East Africa
East Africa, including for example Ethiopia, Eritrea, Kenya, Somalia, South Sudan, Sudan, Tanzania, and Uganda, has a diverse climate, ranging from hot, dry regions to cooler, wetter highland regions. The region has considerable variability in seasonal rainfall and a very complex topography. In the northern parts of the region within the Nile basin (Ethiopia, Sudan), the rainfall is characterized by an unimodal cycle with a wet season from July to September. The rest of the region has a bimodal annual cycle, featuring long rains from March to May and the short rains from October to December. The frequent occurrence of hydrological extremes, like droughts andfloods, harms the already vulnerable population suffering from severe poverty and economic turmoil.[93] Droughts prompted food shortages for example in1984–85,2006 and2011.
The Eastern African region experiences theimpacts of climate change in different forms. For instance, below-average rainfall occurred for six consecutive rainy seasons in the Horn of Africa during the period 2020–2023 leading to the third longest and most widespread drought on record with dire implications for food security (seeHorn of Africa drought (2020–present)). Conversely, other parts experienced extreme floods, e.g., the2020 East Africa floods in Ethiopia, Rwanda, Kenya, Burundi, and Uganda, and the 2022 floods in South Sudan.[93][14][15]
A key feature in the region is the heterogeneous distribution of hydrologic extremes in space and time. For instance,El Niño can cause droughts in one part of the region and floods in the other. This is also a common situation within a country, e.g., in Ethiopia. The recent years with consecutive droughts followed by floods are a testament to the need to better forecast these kinds of events and their impacts.[93]
Approximately 2.4 billion people live in thedrainage basin of the Himalayan rivers.[94]India,China,Pakistan,Bangladesh,Nepal andMyanmar could experience floods followed by droughts in coming decades.Drought in India affecting the Ganges is of particular concern, as it providesdrinking water and agriculturalirrigation for more than 500 million people.[95][96][97] In 2025, the UN warned that retreating glaciers could threaten the food and water supply of 2 billion people worldwide.[98]
Agriculturally, people can effectively mitigate much of the impact of drought through irrigation andcrop rotation. Failure to develop adequate drought mitigation strategies carries a grave human cost in the modern era, exacerbated byever-increasing population densities.
Strategies for drought protection or mitigation include:
Dams – many dams and their associated reservoirs supply additional water in times of drought.[101]
Cloud seeding – a form of intentional weather modification to induce rainfall.[102] This remains a hotly debated topic, as theUnited States National Research Council released a report in 2004 stating that to date, there is still no convincing scientific proof of the efficacy of intentional weather modification.[103]
Land use – Carefully plannedcrop rotation can help to minimizeerosion and allow farmers to plant less water-dependent crops in drier years.
Transvasement – Building canals or redirecting rivers as massive attempts atirrigation in drought-prone areas.
Throughout history, humans have usually viewed droughts asdisasters due to the impact on food availability and the rest of society. Drought is among the earliest documented climatic events, present in theEpic of Gilgamesh and tied to theBiblical story ofJoseph's arrival in and the laterExodus fromancient Egypt.[104] Hunter-gatherer migrations in 9,500 BC Chile have been linked to the phenomenon,[105] as has the exodus of early humansout of Africa and into the rest of the world around 135,000 years ago.[106]
Droughts can be scientifically explained in terms of physical mechanisms, which underlienatural disasters and are influenced byhuman impact on the environment.[107]Beliefs about drought are further shaped by cultural factors including local knowledge, perceptions, values, beliefs and religion. In some places and times, droughts have been interpreted as the work ofsupernatural forces.[108] Globally, people in many societies have been more likely to explain natural events like drought, famine and disease in terms of the supernatural than they are to explain social phenomena like war, murder, and theft.[109][110]
In areas where people have limited understanding of the scientific basis of drought, beliefs about drought continue to reflect indigenous beliefs in the power of spirits and Christian philosophies that see drought as a divine punishment. Such beliefs can influence people's thinking and affect their resilience and ability to adapt to stress and respond to crises.[108] In the case ofCreationism, curricula sometimes give religious explanations of natural phenomena rather than scientific ones. Teaching explicitly deniesevolution, that human agency is affecting climate, and that climate change is occurring.[112]
Drought might have been a contributing factor toClassic Maya collapse between the 7th and 9th centuries.[115]
1540 Central Europe, said to be the "worst drought of the millennium" with eleven months without rain and temperatures of 5–7 °C above the average of the 20th century[116][117]
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