Study on Recent Trends of Climate Variability
Using Innovative Trend Analysis: The Case
of the upper Huai River Basin

Girma, Abel; Qin, Tianling; Wang, Hao; Yan, Denghua; Gedefaw, Mohammed; Abiyu, Asaminew; Dorjsuren, Batsuren

doi:10.15244/pjoes/103448

Cited by 33 publications

(18 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The methodology consists of dividing into two subseries of equal numbers in the observation variables of the study. For the next step, each subseries is reorganized in ascending order and plotted against the other in a Cartesian coordinate system [68]. The first half is plotted on the X-axis, and the second half on the Y-axis.…”

mentioning

confidence: 99%

Spatiotemporal Changes in Temperature and Precipitation in West Africa. Part I: Analysis with the CMIP6 Historical Dataset

Quenum

Nkrumah

Klutse

et al. 2021

Water

View full text Add to dashboard Cite

Climate variability and change constitute major challenges for Africa, especially West Africa (WA), where an important increase in extreme climate events has been noticed. Therefore, it appears essential to analyze characteristics and trends of some key climatological parameters. Thus, this study addressed spatiotemporal variabilities and trends in regard to temperature and precipitation extremes by using 21 models of the Coupled Model Intercomparison Project version 6 (CMIP6) and 24 extreme indices from the Expert Team on Climate Change Detection and Indices (ETCCDI). First, the CMIP6 variables were evaluated with observations (CHIRPS, CHIRTS, and CRU) of the period 1983–2014; then, the extreme indices from 1950 to 2014 were computed. The innovative trend analysis (ITA), Sen’s slope, and Mann–Kendall tests were utilized to track down trends in the computed extreme climate indices. Increasing trends were observed for the maxima of daily maximum temperature (TXX) and daily minimum temperature (TXN) as well as the maximum and minimum of the minimum temperature (TNX and TNN). This upward trend of daily maximum temperature (Tmax) and daily minimum temperature (Tmin) was enhanced with a significant increase in warm days/nights (TX90p/TN90p) and a significantly decreasing trend in cool days/nights (TX10p/TN10p). The precipitation was widely variable over WA, with more than 85% of the total annual water in the study domain collected during the monsoon period. An upward trend in consecutive dry days (CDD) and a downward trend in consecutive wet days (CWD) influenced the annual total precipitation on wet days (PRCPTOT). The results also depicted an upward trend in SDII and R30mm, which, additionally to the trends of CDD and CWD, could be responsible for localized flood-like situations along the coastal areas. The study identified the 1970s dryness as well as the slight recovery of the 1990s, which it indicated occurred in 1992 over West Africa.

show abstract

mentioning

confidence: 99%

Spatiotemporal Changes in Temperature and Precipitation in West Africa. Part I: Analysis with the CMIP6 Historical Dataset

Quenum

Nkrumah

Klutse

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…where x j and x i are the values in period j and i. When the number of data series is greater than or equal to ten (n ≥ 10), the MK test is then characterized by a normal distribution with the mean E(S) = 0 and variance Var(S) equated as [26,27]:…”

Section: Hydrometeorology Methodsmentioning

confidence: 99%

Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin

et al. 2021

Self Cite

View full text Add to dashboard Cite

The Tuul River Basin is the most important socioeconomic and political base area of Mongolia. Therefore, studying the interrelationships between changes in the ecohydrological processes of this basin and its land cover is of great importance for maintaining sustainability and the environment. This study investigated the annual average air temperature, total annual precipitation, and river discharge variability, and land cover changes at selected stations of the basin by using the hydrometeorological analysis, satellite analysis, and land cover determination statistical analysis. During the study period, the average annual air temperature rose from −1.5 °C to +0.3 °C (1.8 °C 361 °C). The average annual precipitation exhibits relatively low change during this period. River discharge varied during the study period. A significant decreasing trend in river discharge was observed at the Terelj (φ = −2.72) and Ulaanbaatar (φ = −5.63) stations, whereas the other stations, Altanbulag, Lun, and Orkhontuul, showed a significant increasing trend. During the study period, changes in land cover were directly related to main hydrometeorological parameters. Between 2000 and 2020, the amount of grassland decreased by 319.67 km2, while the area of water bodies increased by 28.36 km2. In the study area, mainly water bodies and sensitive areas of the land cover types were changed due to changes in precipitation. Studies in the arid and semiarid regions of Central Asia show that changes of ecohydrological processes have a significant impact on land cover changes.

show abstract

“…This relative new methodology for trend analysis was coined by S ¸en (2012), and has been widely used (Girma et al 2020;Kis ¸i et al 2018). The method splits the time series into two equal halves and arranges each half in ascending order.…”

Section: Innovative Trend Analysismentioning

confidence: 99%

Rainfall characterization of the Bumbu watershed, Papua New Guinea

Doaemo¹,

Wuest²,

Athikalam³

et al. 2021

Theor Appl Climatol

View full text Add to dashboard Cite

Accurate assessment of the rainfall characteristics of a river basin is essential for its proper management. In this study, we examine long-term trends in annual rainfall, the regional climate cycle and the frequency and magnitude of extreme rainfall events in the Bumbu watershed of Morobe Province, Papua New Guinea. Data for the study are derived from 36 years of rainfall measurement from the rain gauge station at the Papua New Guinea University of Technology (PNGUOT), located in the municipality of Lae within the Bumbu watershed. The overall trend of the rainfall is studied using multiple analytical techniques, linear regression, Mann-Kendall rank statistics, Sen's Slope and Innovative Trend Analysis. Given the large amount of variance in the raw data attributable to cyclic phenomena, raw data are prepared for trend analysis using spectral analysis to remove cyclic components. The spectral analysis also assists assessment of the regional climatic cycles. Changes in the frequency and magnitude of extreme rainfall events over the last 50 years are tested using Chi-Square analysis. The four analyses of trend revealed that there had been a statistically significant decrease in annual rainfall (20 to 24%) in the study area over the years 1972-2007. Spectral analysis of regional climatic variation established that the area exhibits a unique climatic cycle compared to its regional neighbors. The study also concluded that there has been a significant increase in the frequency of extreme rainfall events in the region, providing valuable information for flood emergency response planning. KeywordsRainfall • Papua New Guinea • ENSO cycles • Spectral analysis • Trend analysis • Extreme rainfall events Publisher's note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Study on Recent Trends of Climate Variability Using Innovative Trend Analysis: The Case of the upper Huai River Basin

Cited by 33 publications

References 27 publications

Spatiotemporal Changes in Temperature and Precipitation in West Africa. Part I: Analysis with the CMIP6 Historical Dataset

Spatiotemporal Changes in Temperature and Precipitation in West Africa. Part I: Analysis with the CMIP6 Historical Dataset

Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin

Rainfall characterization of the Bumbu watershed, Papua New Guinea

Contact Info

Product

Resources

About