Rainfall and temperature trends in India

Kothyari, Umesh C.; Singh, Vijay P.

doi:10.1002/(sici)1099-1085(199603)10:3<357::aid-hyp305>3.0.co;2-y

Cited by 103 publications

(27 citation statements)

References 26 publications

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“…Rainfall is also very important for the economic development, disaster management and hydrological planning of a country. This natural resource and the associated variables, such as temperature, runoff and groundwater, are commonly used to characterize the climatic state of a region (Kothyari and Singh 1996). Careful assessment of the magnitude and extent of these variables is done, using them as indicators of climatic change.…”

Section: Introductionmentioning

confidence: 99%

The nature of rainfall in the main drainage sub-basins of Uganda

Nsubuga

Botai

Olwoch

et al. 2014

Hydrological Sciences Journal

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A study of rainfall trends and temporal variations within seven sub-basins of Uganda spanning from 1940 to 2009 has been made. Rainfall climatologies are constructed from observational data, using 36 station records which reflect hydroclimatic conditions. Long-term changes in rainfall characteristics were determined by non-parametric tests (Mann-Kendall and Sen's T tests), coefficient of variation (CV), precipitation concentration index and drought severity index. Magnitude of change was estimated by applying Sen's estimator of slope. Decadal variability of rainfall with marked seasonal cycles is evident. Temporal variability of drought patterns is detected. Variations in annual rainfall are low with no significant trends observed in the main drainage sub-basins. Significant trends occur in October, November, December and January. A noticeable decrease in the annual total rainfall was observed mostly in northwestern and southwestern sub-basins. Rainfall trend in the second normal of June-July-August (JJA) was decreasing in all the main drainage sub-basins.Key words trend analysis; Mann-Kendall; Sen's T test; precipitation concentration index; drought severity index; drainage sub-basins; Uganda La nature des précipitations dans les principaux sous-bassins de l'Ouganda Résumé Une étude des tendances et des variations temporelles des précipitations dans sept sous-bassins de l'Ouganda à été réalisée sur lapériode allant de 1940 à 2009. La climatologie des précipitations a été construite à partir des données observées dans 36 stations représentatives des conditions hydroclimatiques. Les changements à long terme des caractéristiques des précipitations, coefficient de variation, indice de concentration des précipitations et indice de gravité de la sécheresse, ont été déterminés par des tests non paramétriques (test de Mann-Kendall et test T de Sen). L'amplitude du changement a été estimée en appliquant l'estimateur de pente de Sen. La variabilité décennale des précipitations aux cycles saisonniers marqués est évidente. La variabilité temporelle des phénomènes de sécheresse a été détectée. Les variations des précipitations annuelles sont faibles sans tendances significatives observées dans les principaux sous-bassins. Des tendances significatives ont été observées en octobre, novembre, décembre et janvier. Une diminution notable des précipitations totales annuelles a été observée principalement dans les sous bassins du Nord-ouest et du Sud-ouest. Une tendance à la décroissance des précipitations en juin-juillet-août (JJA) a été observée dans tous les sous-bassins principaux.

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Section: Introductionmentioning

confidence: 99%

The nature of rainfall in the main drainage sub-basins of Uganda

Nsubuga

Botai

Olwoch

et al. 2014

Hydrological Sciences Journal

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“…Since the Indian Peninsula is a "water-limited" area considering long- term evaporation (McVicar et al, 2012), precipitation tendencies might play a key role in interpreting DSI shifts. Kothyari and Singh (1996) studied long-term time series of summer monsoon rainfall and identified decadal departures above and below the long time average alternatively for three consecutive decades. Singh and Sontakke (2002) reported on an increase in extreme rainfall events over northwest India during the summer monsoon and a decline of the number of rainy days along east coastal stations in the past decades, resulting in a westward shift in rainfall activities.…”

Section: Resultsmentioning

confidence: 99%

Global trend analysis of the MODIS drought severity index

Orvos

Homonnai

Várai

et al. 2015

Geosci. Instrum. Method. Data Syst.

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Abstract. Recently, Mu et al. (2013) compiled an open access database of a remotely sensed global drought severity index (DSI) based on MODIS (Moderate Resolution Imaging Spectroradiometer) satellite measurements covering a continuous period of 12 years. The highest spatial resolution is 0.05• in the geographic band between 60 • S and 80 • N latitudes (more than 4.9 million locations over land). Here we present a global trend analysis of these satellitebased DSI time series in order to identify geographic locations where either positive or negative trends are statistically significant. Our main result is that 17.34 % of land areas exhibit significant trends of drying or wetting, and these sites constitute geographically connected regions. Since a DSI value conveys local characterization at a given site, we argue that usual field significance tests cannot provide more information about the observations than the presented analysis. The relatively short period of 12 years hinders linking the trends to global climate change; however, we think that the observations might be related to slow (decadal) modes of natural climate variability or anthropogenic impacts.

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“…The example of decreasing precipitation because of increasing deforestation was presented by Meher-Homji (1991). Similarly, Kothyari and Singh (1996) showed increasing temperature and decreasing precipitation trends since the mid-1960s as a result of deforestation. Sharma et al (2000) also showed some evidence of increasing temperature and decreasing precipitation and discharge particularly during low flow season, as a result of anthropogenic effects.…”

Section: Introductionmentioning

confidence: 94%

Dry spell trend analysis of Isfahan Province, Iran

Nasri

Modarres

2008

Intl Journal of Climatology

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ABSTRACT:In the present study the spatiotemporal trend analysis of the annual maximum dry spell length (AMDSL) and the annual number of dry spell periods (ANDSPs) of Isfahan Province in the center of Iran has been conducted based on daily rainfall records taken from 17 rain gauge stations. The autocorrelation functions (ACFs) of dry spell time series showed the randomness of dry spells. The use of Mann-Kendall test for trend revealed two stations with significant negative trend of the AMDSL located in east and west of the province. The trend analysis of the ANDSP showed three stations with significant upward trend in east and one station with significant negative trend in the west of the province. The sequential Mann-Kendall test showed an evidence of an individual abrupt change in the magnitudes of dry spells from 1980s, especially in eastern arid and semi-arid regions of the province. However, the binomial and uniform distribution of Mann-Kendall statistics reveals that individual trend in a region is not strong enough to conclude the large-scale regional climatic effects on dry spell characteristics in the entire Isfahan Province.

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Rainfall and temperature trends in India

Cited by 103 publications

References 26 publications

The nature of rainfall in the main drainage sub-basins of Uganda

The nature of rainfall in the main drainage sub-basins of Uganda

Global trend analysis of the MODIS drought severity index

Dry spell trend analysis of Isfahan Province, Iran

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