The end of the African humid period as seen by a transient comprehensive Earth system model simulation of the last 8000 years
Enhanced summer insolation during the early and mid-Holocene drove increased precipitation and widespread expansion of vegetation across the Sahara during the African humid period (AHP). While changes in atmospheric dynamics during this time have been a major focus of palaeoclimate modelling efforts...
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description | Enhanced summer insolation during the early and mid-Holocene drove increased precipitation and widespread expansion of vegetation across the Sahara during the African humid period (AHP). While changes in atmospheric dynamics during this time have been a major focus of palaeoclimate modelling efforts, the transient nature of the shift back to the modern desert state at the end of this period is less well understood. Reconstructions reveal a spatially and temporally complex end of the AHP, with an earlier end in the north than in the south and in the east than in the west. Some records suggest a rather abrupt end, whereas others indicate a gradual decline in moisture availability. Here we investigate the end of the AHP based on a transient simulation of the last 7850 years with the comprehensive Earth system model MPI-ESM1.2. The model largely reproduces the time-transgressive end of the AHP evident in proxy data, and it indicates that it is due to the regionally varying dynamical controls on precipitation. The impact of the main rain-bringing systems, i.e. the summer monsoon and extratropical troughs, varies spatially, leading to heterogeneous seasonal rainfall cycles that impose regionally different responses to the Holocene insolation decrease. An increase in extratropical troughs that interact with the tropical mean flow and transport moisture to the western Sahara during the mid-Holocene delays the end of the AHP in that region. Along the coast, this interaction maintains humid conditions for a longer time than further inland. Drying in this area occurs when this interaction becomes too weak to sustain precipitation. In the lower latitudes of west Africa, where the rainfall is only influenced by the summer monsoon dynamics, the end of the AHP coincides with the retreat of the monsoonal rain belt. The model results clearly demonstrate that non-monsoonal dynamics can also play an important role in forming the precipitation signal and should therefore not be neglected in analyses of north African rainfall trends. |
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While changes in atmospheric dynamics during this time have been a major focus of palaeoclimate modelling efforts, the transient nature of the shift back to the modern desert state at the end of this period is less well understood. Reconstructions reveal a spatially and temporally complex end of the AHP, with an earlier end in the north than in the south and in the east than in the west. Some records suggest a rather abrupt end, whereas others indicate a gradual decline in moisture availability. Here we investigate the end of the AHP based on a transient simulation of the last 7850 years with the comprehensive Earth system model MPI-ESM1.2. The model largely reproduces the time-transgressive end of the AHP evident in proxy data, and it indicates that it is due to the regionally varying dynamical controls on precipitation. The impact of the main rain-bringing systems, i.e. the summer monsoon and extratropical troughs, varies spatially, leading to heterogeneous seasonal rainfall cycles that impose regionally different responses to the Holocene insolation decrease. An increase in extratropical troughs that interact with the tropical mean flow and transport moisture to the western Sahara during the mid-Holocene delays the end of the AHP in that region. Along the coast, this interaction maintains humid conditions for a longer time than further inland. Drying in this area occurs when this interaction becomes too weak to sustain precipitation. In the lower latitudes of west Africa, where the rainfall is only influenced by the summer monsoon dynamics, the end of the AHP coincides with the retreat of the monsoonal rain belt. The model results clearly demonstrate that non-monsoonal dynamics can also play an important role in forming the precipitation signal and should therefore not be neglected in analyses of north African rainfall trends.</description><identifier>ISSN: 1814-9324</identifier><identifier>ISSN: 1814-9332</identifier><identifier>EISSN: 1814-9332</identifier><identifier>DOI: 10.5194/cp-16-117-2020</identifier><language>eng</language><publisher>GOTTINGEN: Copernicus Gesellschaft Mbh</publisher><subject>Analysis ; Atmospheric dynamics ; Atmospheric models ; Atmospheric precipitations ; Coastal zone ; Computer simulation ; Drying ; Dynamic meteorology ; Dynamics ; Earth ; Geology ; Geosciences, Multidisciplinary ; Holocene ; Insolation ; Meteorology & Atmospheric Sciences ; Moisture ; Moisture availability ; Monsoons ; Palaeoclimate ; Paleoclimate ; Physical Sciences ; Precipitation ; Precipitation (Meteorology) ; Proxy ; Rain ; Rainfall ; Rainfall cycles ; Rainfall trends ; Science & Technology ; Seasonal rainfall ; Simulation ; Summer ; Summer monsoon ; Tropical climate ; Troughs ; Wind</subject><ispartof>Climate of the past, 2020-01, Vol.16 (1), p.117-140</ispartof><rights>COPYRIGHT 2020 Copernicus GmbH</rights><rights>2020. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). 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The impact of the main rain-bringing systems, i.e. the summer monsoon and extratropical troughs, varies spatially, leading to heterogeneous seasonal rainfall cycles that impose regionally different responses to the Holocene insolation decrease. An increase in extratropical troughs that interact with the tropical mean flow and transport moisture to the western Sahara during the mid-Holocene delays the end of the AHP in that region. Along the coast, this interaction maintains humid conditions for a longer time than further inland. Drying in this area occurs when this interaction becomes too weak to sustain precipitation. In the lower latitudes of west Africa, where the rainfall is only influenced by the summer monsoon dynamics, the end of the AHP coincides with the retreat of the monsoonal rain belt. 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While changes in atmospheric dynamics during this time have been a major focus of palaeoclimate modelling efforts, the transient nature of the shift back to the modern desert state at the end of this period is less well understood. Reconstructions reveal a spatially and temporally complex end of the AHP, with an earlier end in the north than in the south and in the east than in the west. Some records suggest a rather abrupt end, whereas others indicate a gradual decline in moisture availability. Here we investigate the end of the AHP based on a transient simulation of the last 7850 years with the comprehensive Earth system model MPI-ESM1.2. The model largely reproduces the time-transgressive end of the AHP evident in proxy data, and it indicates that it is due to the regionally varying dynamical controls on precipitation. The impact of the main rain-bringing systems, i.e. the summer monsoon and extratropical troughs, varies spatially, leading to heterogeneous seasonal rainfall cycles that impose regionally different responses to the Holocene insolation decrease. An increase in extratropical troughs that interact with the tropical mean flow and transport moisture to the western Sahara during the mid-Holocene delays the end of the AHP in that region. Along the coast, this interaction maintains humid conditions for a longer time than further inland. Drying in this area occurs when this interaction becomes too weak to sustain precipitation. In the lower latitudes of west Africa, where the rainfall is only influenced by the summer monsoon dynamics, the end of the AHP coincides with the retreat of the monsoonal rain belt. The model results clearly demonstrate that non-monsoonal dynamics can also play an important role in forming the precipitation signal and should therefore not be neglected in analyses of north African rainfall trends.</abstract><cop>GOTTINGEN</cop><pub>Copernicus Gesellschaft Mbh</pub><doi>10.5194/cp-16-117-2020</doi><tpages>24</tpages><orcidid>https://orcid.org/0000-0001-6225-5488</orcidid><orcidid>https://orcid.org/0000-0002-3270-610X</orcidid><orcidid>https://orcid.org/0000-0002-3831-3198</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Analysis Atmospheric dynamics Atmospheric models Atmospheric precipitations Coastal zone Computer simulation Drying Dynamic meteorology Dynamics Earth Geology Geosciences, Multidisciplinary Holocene Insolation Meteorology & Atmospheric Sciences Moisture Moisture availability Monsoons Palaeoclimate Paleoclimate Physical Sciences Precipitation Precipitation (Meteorology) Proxy Rain Rainfall Rainfall cycles Rainfall trends Science & Technology Seasonal rainfall Simulation Summer Summer monsoon Tropical climate Troughs Wind |
title | The end of the African humid period as seen by a transient comprehensive Earth system model simulation of the last 8000 years |
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