Annual displacement and appropriate index to determine ITCZ position in East Africa and the Indian Ocean regions

Lashkari, H; Jafari, Mahnaz

doi:10.1007/s00703-021-00797-y

Cited by 10 publications

(4 citation statements)

References 46 publications

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“…The ITCZ continues to move north ward and arrives in region I between mid-May and the end of June and persists until the first week of September to the first week of November. After the first week of September to the first week of November, it starts to move back southward (Diro et al, 2009;Lashkari & Jafari, 2021a;Korecha & Barnston, 2007). This gives rise to the bimodal rainfall pattern in region II and region III and the monomodal pattern in region I of the basin.…”

Section: Discussionmentioning

confidence: 99%

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Ayalew

Wagner

Sahlu

et al. 2022

Environ Monit Assess

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Land use and climate dynamics have a pronounced impact on water resources, biodiversity, land degradation, and productivity at all scales. Thus, in this study, we present the spatio-temporal dynamics of land use change and climate aiming to provide a scientific evidence about gains and losses in major land use categories and associated drivers and significancy and homogeneity of climate change. To this end, Landsat images and historical climate data have been used to determine the dynamics. In addition, population census data and land use policy have been considered to assess the potential drivers of land use change. The spatio-temporal land use dynamics have been evaluated using transition matrix and dynamics index. Likewise, shifts in the climate data were analyzed using change point analysis and three homogenous climate zones have been identified using principal component analysis. The results show that, from 1989 to 2019, the areal percentage of agricultural land increased by 27.5%, settlement by 0.8%, and barren land 0.4% while the natural vegetation, wetland, water body, and grass land decreased by 24.5%, 1.6%, 0.5%, and 2.1%, respectively. The land use dynamics have been stronger in the first decade of the study period. An abrupt shift of climate has occurred in the 1980s. In the last four decades, rainfall shows a not significant decreasing trend. However, a significant increasing trend has been observed for temperature. Rapid population growth, agricultural expansion policy, and climate variability have been identified as the underlying drivers of land use dynamics.

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Section: Discussionmentioning

confidence: 99%

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Ayalew

Wagner

Sahlu

et al. 2022

Environ Monit Assess

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“…As the ITCZ is one of the large-scale precipitating systems that greatly influences the climate of coastal tropical regions [17,46,47] , the main objective of this study was to present an algorithm developed to locate both the primary and secondary bands (double ITCZ) of the ITCZ over the Atlantic basin. The algorithm identifies the initial (Li) and final (Lf) limits of the bands, providing information for the calculation of the average position, width, and intensity of the two bands.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the Intertropical Convergence Zone over the Atlantic Ocean through an Algorithm Based on Precipitation

Chrysostomo de Oliveira Nogueira,

Gomes Machado,

Simões Reboita

et al. 2024

j. of atmos. sci. res.

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The Intertropical Convergence Zone (ITCZ) is a key atmospheric system on a global scale, primarily driven by trade wind convergence near the equator. The ITCZ plays a crucial role in modulating the climate of the borders of tropical continental areas. For instance, Northeastern Brazil experiences a climate influenced by the ITCZ over the Atlantic Ocean. In some periods, the ITCZ exhibits double bands, known as the double ITCZ. While the features of the ITCZ have been described using various approaches and atmospheric variables, there is still a lack of regional studies focusing on the ITCZ and double ITCZ in the Atlantic Ocean. In this context, the main goals of this study are (1) to describe a simple algorithm based on precipitation to identify the ITCZ and double ITCZ, (2) to present a climatology (1997–2022) of the position, width, and intensity of these two convective bands, and (3) to investigate variabilities in the ITCZ characteristics associated with anomalies of sea surface temperature (SST) in the tropical Pacific and Atlantic oceans. The double ITCZ typically occurs southward of the main cloud band, and between February and April, both bands are more distant (~4.5°). In the western sector of the Atlantic Ocean, the ITCZ and its double band extend to more southerly latitudes in austral autumn. Considering the entire Atlantic basin, the annual mean of the latitudinal position, width, and intensity of the ITCZ is 4.9°N, 4.2°, and 11 mm/day, respectively, while for the double ITCZ, it is 0.4°N, 2.6°, 10.3 mm/day, respectively. While the SST anomalies in the Pacific Ocean (El Niño and La Niña episodes) affect more the ITCZ width, the SST anomalies in the Tropical South Atlantic affect both its position and width.

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“…This seasonal variability may be ascribed to the impact of the Intertropical Convergence Zone (ITCZ) shift during the austral winter, which caused changes in the wind speed on the sea surface [58], thus favoring Hg emission. Indeed, ITCZ is a belt of air masses from both the Northern and Southern hemispheres mixing together which crosses the equator from south to north around April-May (IS1) and reaches its northernmost point around June-July (winter), and then moves south again around August-September [58,59]. Therefore, the relocation of the ITCZ over the Indian Ocean was likely a vector of air masses from the north to AMS that reasonably influenced the recorded GEM concentrations.…”

Section: Hg In the Atmosphere And Wet Deposition 321 Gem Measurementsmentioning

confidence: 96%

Seven-Year Monitoring of Mercury in Wet Precipitation and Atmosphere at the Amsterdam Island GMOS Station

Tassone

Magand

Naccarato

et al. 2023

Preprint

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Annual displacement and appropriate index to determine ITCZ position in East Africa and the Indian Ocean regions

Cited by 10 publications

References 46 publications

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Land use change and climate dynamics in the Rift Valley Lake Basin, Ethiopia

Assessment of the Intertropical Convergence Zone over the Atlantic Ocean through an Algorithm Based on Precipitation

Seven-Year Monitoring of Mercury in Wet Precipitation and Atmosphere at the Amsterdam Island GMOS Station

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