New evidence for a reduced water balance in East Africa during the Last Glacial Maximum: Implication for model-data comparison.

Lancaster Environment Centre

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https://doi.org/10.1016/S0277-3791(03)00010-6
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Keywords

SEA-SURFACE TEMPERATURE, LAKE LAKE MASSOKO, PAST 25, 000 YEARS, LATE QUATERNARY, CLIMATE-CHANGE, LATE PLEISTOCENE, SOUTHERN TROPICS, DIATOM RECORD, CRATER LAKE

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New evidence for a reduced water balance in East Africa during the Last Glacial Maximum: Implication for model-data comparison. / Barker, Philip; Gasse, F.
In: Quaternary Science Reviews, Vol. 22, No. 8-9, 04.2003, p. 823-837.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{b69072ac3cfd4c8193f07b4dda63bc39,

title = "New evidence for a reduced water balance in East Africa during the Last Glacial Maximum: Implication for model-data comparison.",

abstract = "Some syntheses of lake-level data for the Last Glacial Maximum (LGM) in East Africa (10degreesN and 30degreesS, East of 25degreesE) show apparently wetter conditions than present for some basins, whereas palaeovegetation reconstruction indicates a generally dry climate. PMIP GCM simulations for the LGM support both scenarios for this region when run under different boundary conditions. Here. we compare three new records from lakes in the data-poor southern part of East Africa; Lake Malawi, Lake Massoko, and Lake Rukwa. We also re-assess previously published lake-level data and apply a salinity transfer function to the diatom record from Lake Manyara. Our results show that in contrast to previous interpretations, these lakes were at least as low as today at the LGM and are thus in agreement with the palaeovegetation data. Relative drought across East Africa is best simulated by GCMs that use computed SSTs rather than the higher CLIMAP values. Lower SSTs and the presence of the Northern Hemisphere ice sheets must have been dominant over any monsoon precipitation rise caused by astronomically induced summer insolation enhancement in the southern African tropics.",

keywords = "SEA-SURFACE TEMPERATURE, LAKE LAKE MASSOKO, PAST 25, 000 YEARS, LATE QUATERNARY, CLIMATE-CHANGE, LATE PLEISTOCENE, SOUTHERN TROPICS, DIATOM RECORD, CRATER LAKE",

author = "Philip Barker and F. Gasse",

year = "2003",

month = apr,

doi = "10.1016/S0277-3791(03)00010-6",

language = "English",

volume = "22",

pages = "823--837",

journal = "Quaternary Science Reviews",

issn = "0277-3791",

publisher = "Elsevier Limited",

number = "8-9",

}

RIS

TY - JOUR

T1 - New evidence for a reduced water balance in East Africa during the Last Glacial Maximum: Implication for model-data comparison.

AU - Barker, Philip

AU - Gasse, F.

PY - 2003/4

Y1 - 2003/4

N2 - Some syntheses of lake-level data for the Last Glacial Maximum (LGM) in East Africa (10degreesN and 30degreesS, East of 25degreesE) show apparently wetter conditions than present for some basins, whereas palaeovegetation reconstruction indicates a generally dry climate. PMIP GCM simulations for the LGM support both scenarios for this region when run under different boundary conditions. Here. we compare three new records from lakes in the data-poor southern part of East Africa; Lake Malawi, Lake Massoko, and Lake Rukwa. We also re-assess previously published lake-level data and apply a salinity transfer function to the diatom record from Lake Manyara. Our results show that in contrast to previous interpretations, these lakes were at least as low as today at the LGM and are thus in agreement with the palaeovegetation data. Relative drought across East Africa is best simulated by GCMs that use computed SSTs rather than the higher CLIMAP values. Lower SSTs and the presence of the Northern Hemisphere ice sheets must have been dominant over any monsoon precipitation rise caused by astronomically induced summer insolation enhancement in the southern African tropics.

AB - Some syntheses of lake-level data for the Last Glacial Maximum (LGM) in East Africa (10degreesN and 30degreesS, East of 25degreesE) show apparently wetter conditions than present for some basins, whereas palaeovegetation reconstruction indicates a generally dry climate. PMIP GCM simulations for the LGM support both scenarios for this region when run under different boundary conditions. Here. we compare three new records from lakes in the data-poor southern part of East Africa; Lake Malawi, Lake Massoko, and Lake Rukwa. We also re-assess previously published lake-level data and apply a salinity transfer function to the diatom record from Lake Manyara. Our results show that in contrast to previous interpretations, these lakes were at least as low as today at the LGM and are thus in agreement with the palaeovegetation data. Relative drought across East Africa is best simulated by GCMs that use computed SSTs rather than the higher CLIMAP values. Lower SSTs and the presence of the Northern Hemisphere ice sheets must have been dominant over any monsoon precipitation rise caused by astronomically induced summer insolation enhancement in the southern African tropics.

KW - SEA-SURFACE TEMPERATURE

KW - LAKE LAKE MASSOKO

KW - PAST 25

KW - 000 YEARS

KW - LATE QUATERNARY

KW - CLIMATE-CHANGE

KW - LATE PLEISTOCENE

KW - SOUTHERN TROPICS

KW - DIATOM RECORD

KW - CRATER LAKE

U2 - 10.1016/S0277-3791(03)00010-6

DO - 10.1016/S0277-3791(03)00010-6

M3 - Journal article

VL - 22

SP - 823

EP - 837

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

IS - 8-9

ER -

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