Yassine Ait-Brahim

Yassine Ait-Brahim
Mohammed VI Polytechnic University · Water & Climate

Ph.D.

About

63
Publications
24,317
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768
Citations
Citations since 2016
62 Research Items
763 Citations
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2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (63)
Article
Understanding the main controls on stable isotope variations in precipitation is fundamental for the interpretation of the hydrological cycle. However, spatio-temporal variations in δ18Op are poorly known in Morocco. Herein, we explore the relative influence of meteorological variables, spatial and orographic (altitudinal) effects, atmospheric circ...
Article
This study presents the first well-dated high resolution stable isotope (δ18O and δ13C) and trace element (Mg and Sr) speleothem records from southwestern Morocco covering the last 1000 yrs. Our records reveal substantial decadal to multidecadal swings between dry and humid periods, consistent with regional paleorecords with prevailing dry conditio...
Article
Full-text available
Here we present a new composite record from two well-dated speleothem records from two caves in Northern Morocco. The high-resolution record covers the last millennium allowing to detect multi-decadal to centennial periodicities. Over the industrial period, δ18O values of our speleothems are shown to be dominated by the main mode of decadal variabi...
Article
Full-text available
Plain Language Summary During the Holocene, periods of enhanced ice‐rafting, associated with cooling and sea ice expansion in the North Atlantic high latitudes, have been recognized over distant regions. While the causes of these events are still a matter of debate, changes in the atmospheric circulation have been proposed as a potential trigger or...
Article
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We present a speleothem record from western Cuba, spanning the period 98.7–84.9 ka BP. Our record shows two distinctive periods of high δ18O corresponding to dry and/or cold periods during 85–87.6 and 90.2–93.1 ka BP, synchronous with Heinrich events 8 and 9 (H8 and H9). Hence, we provide the first proxy evidence of the local Caribbean climate resp...
Article
Full-text available
The Haouz aquifer is undergoing climatic aridity and anthropic pressure largely related to the agricultural sector. In this study, special attention was given to the main factors that have a direct impact on the fluctuations of the piezometric level (PL). Different statistical analyses (cross-correlations, PCA, cascading analysis) of the relationsh...
Article
Reverse-drags in extensional settings are emblematic structures that may provide imprints of (neo)tectonic pulses, and even evidence of palaeoseismic activity. The direct pieces of evidence of (neo)tectonic activity therein are mostly reported to be subsidiary grabens, synthetic and antithetic normal faults, and/or bed-parallel slip that brittlely...
Article
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The Lower Sebou Basin, placed in a Mediterranean climate, has the particularity of being exposed to the influence of disturbances from the Atlantic Ocean, making periods of drought and climatic phenomena variable in space and time. Applying the world's most recognized drought indices, shows that the duration, frequency and severity of droughts have...
Article
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Rainfall in north-western Morocco has shown significant monthly fluctuations with dramatic socio-economic impacts over the past decades. Several studies have suggested that variability is related to fluctuations in large-scale circulation patterns. In recent years, several promising centennial reanalysis datasets have become available, paving the w...
Presentation
Full-text available
Tufa and speleothem growths are both the response to the rate of carbonaceous bedrock weathering, which is influenced by the vegetation development (and hence the humidity). To investigate the interdependency of these two carbonate archives, a new record of tufa from Northwest Africa has been studied using thorough sedimentologic and stratigraphic...
Presentation
Full-text available
The occurrence and rate of tufa deposition are controlled by a large number of external and internal factors, including climate which often represents the main allocyclic factor. In this study, the first of its kind in the Middle Atlas (Northern Morocco), we test the dependency between climate factors and Holocene tufa deposits in basin-like settin...
Article
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Southern Morocco contains a rich archaeological record: engraving, painted rocks, and funerary monuments. This prehistoric and proto-historical heritage offers valuable information about the environmental context of prehistoric settlements. However, the Southern Moroccan archaeological record suffers from dating scarcity and hence, the difficulty i...
Article
Full-text available
Paleoclimate information is still lacking in key regions to understand the functioning of some of the main components of Earth's climate system. In NW Africa, the use of speleothems as a natural archive of past environmental and climate change gained considerable interest during recent years. From South Morocco, the published speleothem records con...
Article
The occurrence and rate of tufa deposition are controlled by a large number of external and internal factors, including climate which often represents the main allocyclic factor. In this study, the first of its kind in the Middle Atlas (Northern Morocco), we test the dependency between climate factor and Holocene tufa deposits in basin-like setting...
Article
Full-text available
We present absolutely dated speleothem δ¹⁸O records spanning the past ∼1.5 kyr, which provide new evidence of the transmission of an anthropogenic signal to natural climatic archives in NW Africa. Combined with three other speleothem δ¹⁸O records from SW Morocco, the results indicate unprecedentedly dry conditions during the 20th century, which dev...
Article
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Climatic changes have played an important role in societal reorganizations. Particularly, the late 16th and early 17th century coincided with severely cold condition, extremely weak summer monsoon and widespread population decline in China. Here we present new speleothem oxygen isotope records across North and South China, which in concert with his...
Article
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This work aims to study the water resources vulnerability in Souss-Massa region, Morocco. In our case 35 subdivisions were investigated for their water resources vulnerability. Based on an indicator-approach and a participatory weighting method, ten indicators and their weights were identified for the vulnerability assessment, reflecting three aspe...
Article
Speleothem records from NE Asia are essential to understand the spatial patterns of the Asian Summer Monsoon (ASM) variability. In this paper, we present a new high-resolution and chronologically well-resolved speleothem record from Liu-li (LL) cave, NE China, through δ¹⁸O, δ¹³C and Sr/Ca ratio characterizing a dynamic ASM history over the past 668...
Data
Data supporting Comas-Bru et al., 2020 (ESSD): https://doi.org/10.5194/essd-12-2579-2020
Article
Full-text available
Characterizing the temporal uncertainty in palaeoclimate records is crucial for analysing past climate change, correlating climate events between records, assessing climate periodicities, identifying potential triggers and evaluating climate model simulations. The first global compilation of speleothem isotope records by the SISAL (Speleothem Isoto...
Article
Full-text available
Significance The Younger Dryas (YD) was an ∼1,300-y period of extreme climate that dramatically reversed the course of global warming that brought the last Ice Age to a close. Understanding what mechanisms triggered and terminated this event remains enigmatic, but it is fundamental for gaining insights into the inner workings of Earth’s climate sys...
Preprint
Full-text available
Abstract. Characterising the temporal uncertainty in palaeoclimate records is crucial for analysing past climate change, for correlating climate events between records, for assessing climate periodicities, identifying potential triggers, and to evaluate climate model simulations. The first global compilation of speleothem isotope records by the SIS...
Article
Full-text available
We present new high‐resolution oxygen isotope (δ¹⁸O) records from three NW African speleothems located at ~31°N. The present‐day rainfall patterns at 31°N in NW Africa are linked to negative winter North Atlantic Oscillation phases. However, on multimillennial time scales, our δ¹⁸O records, together with other hydroclimate records, provide new evid...
Article
We present triple oxygen isotope data from speleothems obtained by an O2-CO2 Pt-catalyzed oxygen-isotope equilibration method. The high precision (9 per meg or better, 1σ SD) of our new speleothem Δ¹⁷O (carbonate ¹⁷O anomaly) data is sufficient to resolve subtle hydroclimatic signals. In addition, we determined triple oxygen isotope fractionation f...
Article
Full-text available
Although quantitative isotope data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which to achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercom...
Article
Full-text available
Although quantitative isotope data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which to achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercom...
Article
Full-text available
The cave of Wintimdouine, located in a semi-arid context in Morocco, comprises the longest-known underground river in Africa. This cave system faces many challenges related to anthropogenic and climate forcing. Therefore, it has become necessary to understand the functioning of the aquifer system of Wintimdouine and how the regional climate affects...
Article
Full-text available
Asian summer monsoon (ASM) variability significantly affects hydro-climate, and thus socio-economics, in the East Asian region, where nearly one-third of the global population resides. Over the last two decades, speleothem δ18O records from China have been utilized to reconstruct ASM variability and its underlying forcing mechanisms on orbital to s...
Article
Full-text available
Although quantitative isotopic data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercompa...
Article
Full-text available
Geochemical and isotopic investigations were carried out to indicate the interaction process between Ifni Lake water and high valley of Tifnoute springs. A total of 18 water samples were collected and analyzed. The Ifni Lake constitutes a veritable water resource in the study area, and this water can be the origin of alimentation the springs locate...
Article
Full-text available
Stable isotope records from speleothems provide information on past climate changes, most particularly information that can be used to reconstruct past changes in precipitation and atmospheric circulation. These records are increasingly being used to provide out-of-sample evaluations of isotope-enabled climate models. SISAL (Speleothem Isotope Synt...
Article
Full-text available
Stable isotope records from speleothems provide information on past climate changes, most particularly information that can be used to reconstruct past changes in precipitation and atmospheric circulation. These records are increasingly being used to provide “out-of-sample” evaluations of isotope-enabled climate models. SISAL (Speleothem Isotope Sy...
Chapter
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The Massa region is an important agricultural area in south-western Morocco. The climate in this region is semi-arid to arid with an average precipitation of 150-200 mm/y. Thus, the region suffers from water scarcity and water quality degradation. Hence, in this study we aim to assess the influence of human activity and climate change on the qualit...
Article
Full-text available
A common global practice in the High Atlas Mountains is upstream water storage in dammed reservoirs that captures mountainous snowmelt, and downstream agriculture irrigation. However, the intensive use of water for irrigation, coupled with the effects of climate change, makes the region subject to high water stress. This implies the establishment o...
Article
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Highlighting the importance of paleoscience can be difficult. This article has been published after a workshop of young researchers during the PAGES Young Scientist Meeting. It is possible to advertise the importance of paleo research in solving present-day socio-economic problems, despite current challenges. This could be achieved by understanding...
Conference Paper
Full-text available
In this study we present the first U-Th dated and high resolution stable oxygen isotope (δ18O) speleothem records covering the last two millennia in Morocco. Our speleothems were collected from two caves in the Western High Atlas Mountains in Southwestern Morocco and the Eastern Middle Atlas Mountains in Northern Morocco. The new paleoclimate recor...
Article
Full-text available
In spite of its geographical situation on the Atlantic and Mediterranean coast, Morocco is one of the most arid areas of the world; it experiences highly variable rainfall and recurrent droughts. Predictions of climate change consequences on several socio-economical fields in Morocco are very alarming. In fact, climate trends observed in Marrakech...
Conference Paper
Full-text available
Climate projections predict substantial increase of extreme heats and drought occurrences during the coming decades in Morocco. It is however not clear what can be attributed to natural climate variability and to anthro-pogenic forcing, as hydroclimate variations observed in areas such as Morocco are highly influenced by the Atlantic climate modes....
Article
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The Agadir-Essaouira area in the occidental High Atlas Mountains of Morocco is characterized by a semi-arid climate. The scarcity and quality of water resources, exacerbated by long drought periods, constitute a major problem for a sustainable development of this region. Groundwater resources of carbonate units within Jurassic and Cretaceous aquife...
Article
The high valley of Tifnoute is a mountainous area and constitutes a part of High Moroccan Atlas .This area is characterized by irregular terrain and very high altitudes (4167 m) for the Jbel Toubkal the highest mountain in Morocco. The high valley of Tifnoute is considered as a water tower, wirth the highest natural lake in Morocco (Lake Ifni 2320...
Article
Full-text available
Within the context of climate change and increasing demographic pressures, problems of water resources variability have become particularly crucial. The management of arid watersheds, which are highly exposed to droughts and floods, needs to be supported by a thorough understanding of their susceptibility to these hazards. The watershed of Tensift...
Chapter
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Groundwater quality in Souss-Massa Basin is influenced by natural and anthropogenic contaminations. In fact, the geological formations are the main sources of mineralization in Souss-Massa aquifer. The impact of marine intrusion is noticed in the coastal area. However, human activities are also responsible for the deterioration of groundwater quali...
Chapter
Full-text available
This work investigates the current climate situation in Souss-Massa river basin (southwestern Morocco) and the impacts of climate change and land use on groundwater resources in Morocco. The annual rainfall amount ranges from 100 mm in the plains to 600 mm in the High Atlas Mountains. However, climate data indicate an overall decrease of precipitat...
Article
The Plio-Quaternary aquifer of Chtouka is located in Southwestern of Morocco. The intensive agricultural activity in Chtouka basin requires the mobilization of 94% of fresh water resources for irrigation. This overexploitation, along with the succession of drought years, sea water intrusion and various sources of pollution, affected the quality and...
Presentation
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Karst aquifers in Morocco: Interest and prospects for climate change and water resources
Article
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The Chtouka-Massa area in Southern Morocco has shown an increase in water scarcity during the last decades, caused mainly by withdrawal of water resources aggravated by agricultural intensification and climate change impacts. To better understand the changes of groundwater quality, a sampling campaign was conducted in many wells during March 2015 a...
Article
Full-text available
To characterize snow isotopic signatures, monitoring of snowmelt was carried out at two sites (Oukaimden and Ifni) in the Moroccan High Atlas Mountains. For the Oukaimden site, samples of snow were taken by two methods to compare sampling techniques: (1) coring with a polyvinyl chloride (PVC) tube and (2) passive capillary sampling (PCS) installed...
Conference Paper
Full-text available
In this work, we present a stable oxygen isotope (δ18O) speleothem record from Ifoulki cave located SouthWest of Morocco (N 30 • 42'29", W 09 • 19'39" and 1267 meters above sea level). The age model, based on eighteen U-Th dates, reveals that the record covers the AD 790-1953 period with a data resolution of ∼1.7 years. Stable oxygen isotope variat...
Article
Full-text available
Under the arid climate in the southern sub-Saharan catchments of Morocco, groundwater is the only permanent water supply. Usually, the groundwater is scarce because of the low recharge. However, the mining activities in Oumjrane area (Eastern Anti-Atlas Mountains) reveal that water resources are relatively abundant in the fissured Ordovician aquife...

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Projects (2)
Project
Held once every four years, PAGES’ Open Science Meeting (OSM) and Young Scientists Meeting (YSM) are the premier events in PAGES’ calendar and provide an invaluable opportunity to bring the international past global change community together to share, discuss, learn, and plan for the future. (http://www.pages-osm.org/) PAGES is pleased to announce the 6th OSM and 4th YSM will be held in Agadir, Morocco, in May 2021. YSM - 16-18 May 2021. OSM - 18-22 May 2021. Fieldtrips - starting 23 May 2021
Project
The goal of SISAL (Speleothem Isotopes Synthesis and AnaLysis) PAGES-sponsored working group is to create a global synthesis of stable isotopes of oxygen and carbon (δ18O, δ13C) in speleothems. Website: http://pastglobalchanges.org/ini/wg/sisal/intro