Asfawossen Asrat
Dados Biográficos
| ID | 5626511 |
|---|---|
| NOME | Asfawossen Asrat |
| PRENOMES | Asfawossen |
| SOBRENOME | Asrat |
| ASSINATURA | ASRAT A |
| AFILIAÇÕES | Addis Ababa University |
| ORCID | 0000-0002-6312-8082 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 20 |
| TOTAL DE CITAÇÕES | 92 |
| TOTAL COMO AUTOR | 20 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2002 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2024 |
| ÍNDICE H | 5 |
Spatio-temporal variations of climate along possible African-Arabian routes of H. sapiens expansion
Eastern Africa and Arabia were major hominin hotspots and critical crossroads for migrating towards Asia during the late Pleistocene. To decipher the role of spatiotemporal environmental change on human occupation and migration patterns, we remeasured the marine core from Meteor Site KL 15 in the Gulf of Aden and reanalyzed its data together with the aridity index from ICDP Site Chew Bahir in eastern Africa and the wet-dry index from ODP Site 967…
Melka Wakena, Ethiopia
Goda Buticha, Ethiopia
New Rock Art Sites in Tigrai, Northern Ethiopia, and Their Relevance to the Understanding of the Rock Art and Dating of Domesticates Elsewhere in Ethiopia
Two new rock art sites in Irob district of eastern Tigrai, northern Ethiopia, are presented. One of the sites, Ra Bolo, contains images of domestic cattle and human figures while the other, Adhay Bolo, appears to contain only images of caprines, the only example of such a scene not just in the region but in all of Ethiopia. The sites fit well with the already established northern Ethiopian assemblage of paintings and engravings. The paintings bel…
Stalagmite evidence for Early Holocene multidecadal hydroclimate variability in Ethiopia
A multiproxy oxygen and carbon isotope (δ 13 C and δ 18 O), growth rate, and trace element stalagmite paleoenvironmental record is presented for the Early Holocene from Ethiopia. The annually laminated stalagmite grew from 10.6 to 10.4 ka and from 9.7 to 9.0 ka with a short hiatus at ~9.25 ka. Statistically significant and coherent spectral frequencies in δ 13 C and δ 18 O are observed at 15–25 and 19–23 years, respectively. The observed ~1‰ ampl…
Fuzzy model-based reconstruction of paleovegetation in Ethiopia
We introduce a new method to compute plant distribution in Ethiopia under paleoclimatic conditions using fuzzy logic. Using a published map of the potential vegetation for Ethiopia we decipher the boundary conditions for the main vegetation units shown, reflecting modern climatic conditions for temperature and precipitation in this region. Fuzzy logic using these climatic values on a GIS platform then derived the computational map of the potentia…
Paleo-Enso influence on African environmentsand early modern humans
lt;p>In this study, we synthesize terrestrial and marine proxy records, spanning the past 620,000 years, to decipher pan-African climate variability and its drivers and potential linkages to hominin evolution. We find a tight correlation between moisture availability across Africa to El Niño Southern Ocean oscillation (ENSO) variability, a manifestation of the Walker Circulation, that was most likely driven by changes in Earth’s eccentricity. Our…
Abrupt or gradual? Change point analysis of the late Pleistocene–Holocene climate record from Chew Bahir, southern Ethiopia
We used a change point analysis on a late Pleistocene–Holocene lake-sediment record from the Chew Bahir basin in the southern Ethiopian Rift to determine the amplitude and duration of past climate transitions. The most dramatic changes occurred over 240 yr (from ~15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from ~4875 to 3885 yr) during its protracted termination. The AHP was interrupted by a distinct …
Engraved ostrich eggshell from the Middle Stone Age contexts of Goda Buticha, Ethiopia
Preliminary study of the rodent assemblages of Goda Buticha
Equatorial eastern Africa
Changing environments and movements through transitions
Cultural change or continuity in the late MSA/Early LSA of southeastern Ethiopia? The site of Goda Buticha, Dire Dawa area
Continental-scale temperature variability during the past two millennia
Temperature variability over Africa during the last 2000 years
A growing number of proxy, historical and instrumental data sets are now available from continental Africa through which past variations in temperature can be assessed. This paper, co-authored by members of the PAGES Africa2k Working Group, synthesises published material to produce a record of temperature variability for Africa as a whole spanning the last 2000 years. The paper focuses on temperature variability during the ‘Medieval Climate Anoma…
Survey and explorations of caves in southeastern Ethiopia
Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years
Decadal-scale rainfall variability in Ethiopia recorded in an annually laminated, Holocene-age, stalagmite
An annually laminated, uranium-series dated, Holocene stalagmite from southeast Ethiopia has been analysed for growth rate and δ 13 C and δ 18 O variations at annual to biennial resolution, in order to provide the first long duration proxy record of decadal-scale rainfall variability in this climatically sensitive region. Our study site (10°N) is climatically influenced by both summer (June—August) and spring (March—May) rainfall caused by the an…
A new approach to detecting vegetation and land-use Change using high-resolution lipid biomarker records in stalagmites
A hundred-year stalagmite lipid biomarker record from Mechara, southeastern Ethiopia, is presented. The record has been recovered at a 10-yr temporal resolution, marking the first time this has been achieved in stalagmite biomarker work and providing the first opportunity to investigate the relationship between stalagmite lipid records and hydrological transport lags, a vital issue in interpreting palaeoenvironmental signals. Preserved plant-deri…
The rock‐hewn churches of Tigrai, Northern Ethiopia
Ethiopia is endowed with many rock‐hewn churches, with the largest group in central and eastern Tigrai. These churches can be divided into four zones: the Atsbi, Hawzen‐Ger'alta, Sinkata‐Adigrat, and Tembien, with more than 100 rock‐hewn churches of different ages, sizes, and histories. However, they have one thing in common: All are carved into sandstone. The Enticho, Adigrat, and Ambaradam sandstones (Permo‐Carboniferous, Triassic—Middle Jurass…
Cultural change or continuity in the late MSA/Early LSA of southeastern Ethiopia? The site of Goda Buticha, Dire Dawa area
Survey and explorations of caves in southeastern Ethiopia
Temperature variability over Africa during the last 2000 years
A growing number of proxy, historical and instrumental data sets are now available from continental Africa through which past variations in temperature can be assessed. This paper, co-authored by members of the PAGES Africa2k Working Group, synthesises published material to produce a record of temperature variability for Africa as a whole spanning the last 2000 years. The paper focuses on temperature variability during the ‘Medieval Climate Anoma…
Engraved ostrich eggshell from the Middle Stone Age contexts of Goda Buticha, Ethiopia
Preliminary study of the rodent assemblages of Goda Buticha
The rock‐hewn churches of Tigrai, Northern Ethiopia
Ethiopia is endowed with many rock‐hewn churches, with the largest group in central and eastern Tigrai. These churches can be divided into four zones: the Atsbi, Hawzen‐Ger'alta, Sinkata‐Adigrat, and Tembien, with more than 100 rock‐hewn churches of different ages, sizes, and histories. However, they have one thing in common: All are carved into sandstone. The Enticho, Adigrat, and Ambaradam sandstones (Permo‐Carboniferous, Triassic—Middle Jurass…
Spatio-temporal variations of climate along possible African-Arabian routes of H. sapiens expansion
Eastern Africa and Arabia were major hominin hotspots and critical crossroads for migrating towards Asia during the late Pleistocene. To decipher the role of spatiotemporal environmental change on human occupation and migration patterns, we remeasured the marine core from Meteor Site KL 15 in the Gulf of Aden and reanalyzed its data together with the aridity index from ICDP Site Chew Bahir in eastern Africa and the wet-dry index from ODP Site 967…
Paleo-Enso influence on African environmentsand early modern humans
lt;p>In this study, we synthesize terrestrial and marine proxy records, spanning the past 620,000 years, to decipher pan-African climate variability and its drivers and potential linkages to hominin evolution. We find a tight correlation between moisture availability across Africa to El Niño Southern Ocean oscillation (ENSO) variability, a manifestation of the Walker Circulation, that was most likely driven by changes in Earth’s eccentricity. Our…
Decadal-scale rainfall variability in Ethiopia recorded in an annually laminated, Holocene-age, stalagmite
An annually laminated, uranium-series dated, Holocene stalagmite from southeast Ethiopia has been analysed for growth rate and δ 13 C and δ 18 O variations at annual to biennial resolution, in order to provide the first long duration proxy record of decadal-scale rainfall variability in this climatically sensitive region. Our study site (10°N) is climatically influenced by both summer (June—August) and spring (March—May) rainfall caused by the an…
The rock‐hewn churches of Tigrai, Northern Ethiopia
Ethiopia is endowed with many rock‐hewn churches, with the largest group in central and eastern Tigrai. These churches can be divided into four zones: the Atsbi, Hawzen‐Ger'alta, Sinkata‐Adigrat, and Tembien, with more than 100 rock‐hewn churches of different ages, sizes, and histories. However, they have one thing in common: All are carved into sandstone. The Enticho, Adigrat, and Ambaradam sandstones (Permo‐Carboniferous, Triassic—Middle Jurass…
A new approach to detecting vegetation and land-use Change using high-resolution lipid biomarker records in stalagmites
A hundred-year stalagmite lipid biomarker record from Mechara, southeastern Ethiopia, is presented. The record has been recovered at a 10-yr temporal resolution, marking the first time this has been achieved in stalagmite biomarker work and providing the first opportunity to investigate the relationship between stalagmite lipid records and hydrological transport lags, a vital issue in interpreting palaeoenvironmental signals. Preserved plant-deri…
Decadal-scale rainfall variability in Ethiopia recorded in an annually laminated, Holocene-age, stalagmite
An annually laminated, uranium-series dated, Holocene stalagmite from southeast Ethiopia has been analysed for growth rate and δ 13 C and δ 18 O variations at annual to biennial resolution, in order to provide the first long duration proxy record of decadal-scale rainfall variability in this climatically sensitive region. Our study site (10°N) is climatically influenced by both summer (June—August) and spring (March—May) rainfall caused by the an…
Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years
Continental-scale temperature variability during the past two millennia
Temperature variability over Africa during the last 2000 years
A growing number of proxy, historical and instrumental data sets are now available from continental Africa through which past variations in temperature can be assessed. This paper, co-authored by members of the PAGES Africa2k Working Group, synthesises published material to produce a record of temperature variability for Africa as a whole spanning the last 2000 years. The paper focuses on temperature variability during the ‘Medieval Climate Anoma…
Survey and explorations of caves in southeastern Ethiopia
Changing environments and movements through transitions
Cultural change or continuity in the late MSA/Early LSA of southeastern Ethiopia? The site of Goda Buticha, Dire Dawa area
Equatorial eastern Africa
Engraved ostrich eggshell from the Middle Stone Age contexts of Goda Buticha, Ethiopia
Preliminary study of the rodent assemblages of Goda Buticha
Abrupt or gradual? Change point analysis of the late Pleistocene–Holocene climate record from Chew Bahir, southern Ethiopia
We used a change point analysis on a late Pleistocene–Holocene lake-sediment record from the Chew Bahir basin in the southern Ethiopian Rift to determine the amplitude and duration of past climate transitions. The most dramatic changes occurred over 240 yr (from ~15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from ~4875 to 3885 yr) during its protracted termination. The AHP was interrupted by a distinct …
Stalagmite evidence for Early Holocene multidecadal hydroclimate variability in Ethiopia
A multiproxy oxygen and carbon isotope (δ 13 C and δ 18 O), growth rate, and trace element stalagmite paleoenvironmental record is presented for the Early Holocene from Ethiopia. The annually laminated stalagmite grew from 10.6 to 10.4 ka and from 9.7 to 9.0 ka with a short hiatus at ~9.25 ka. Statistically significant and coherent spectral frequencies in δ 13 C and δ 18 O are observed at 15–25 and 19–23 years, respectively. The observed ~1‰ ampl…
Fuzzy model-based reconstruction of paleovegetation in Ethiopia
We introduce a new method to compute plant distribution in Ethiopia under paleoclimatic conditions using fuzzy logic. Using a published map of the potential vegetation for Ethiopia we decipher the boundary conditions for the main vegetation units shown, reflecting modern climatic conditions for temperature and precipitation in this region. Fuzzy logic using these climatic values on a GIS platform then derived the computational map of the potentia…
Paleo-Enso influence on African environmentsand early modern humans
lt;p>In this study, we synthesize terrestrial and marine proxy records, spanning the past 620,000 years, to decipher pan-African climate variability and its drivers and potential linkages to hominin evolution. We find a tight correlation between moisture availability across Africa to El Niño Southern Ocean oscillation (ENSO) variability, a manifestation of the Walker Circulation, that was most likely driven by changes in Earth’s eccentricity. Our…
Melka Wakena, Ethiopia
Goda Buticha, Ethiopia
New Rock Art Sites in Tigrai, Northern Ethiopia, and Their Relevance to the Understanding of the Rock Art and Dating of Domesticates Elsewhere in Ethiopia
Two new rock art sites in Irob district of eastern Tigrai, northern Ethiopia, are presented. One of the sites, Ra Bolo, contains images of domestic cattle and human figures while the other, Adhay Bolo, appears to contain only images of caprines, the only example of such a scene not just in the region but in all of Ethiopia. The sites fit well with the already established northern Ethiopian assemblage of paintings and engravings. The paintings bel…
Spatio-temporal variations of climate along possible African-Arabian routes of H. sapiens expansion
Eastern Africa and Arabia were major hominin hotspots and critical crossroads for migrating towards Asia during the late Pleistocene. To decipher the role of spatiotemporal environmental change on human occupation and migration patterns, we remeasured the marine core from Meteor Site KL 15 in the Gulf of Aden and reanalyzed its data together with the aridity index from ICDP Site Chew Bahir in eastern Africa and the wet-dry index from ODP Site 967…
Geography (18 obras) · Geology (13 obras) · Archaeology (11 obras) · Geology and Paleoclimatology Research (11 obras) · Pleistocene-Era Hominins and Archaeology (11 obras) · Climate change (10 obras) · Climatology (9 obras) · Holocene (9 obras) · Physical geography (9 obras) · Oceanography (8 obras)