Changes in the vegetation and trade winds in equatorial northwest Africa 140,000–70,000 yr B.P. as deduced from two marine pollen records

Hooghiemstra, H.; Agwu, Chiori O C

doi:10.1016/0031-0182(88)90199-x

Cited by 56 publications

(15 citation statements)

References 9 publications

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“…They represent more than 30% in the Gulf of Guinea, off the well developed Rhizophora formation of the Niger delta (Dupont and Agwu, 1991), whereas they average only 6% (0-19%) off the Ivory Coast (Caratini et al, 1987), where the corresponding formation are strongly reduced. Toward the north, Rhizophora percentages decrease to 18 and 12% off the less important mangrove extensions of the Casamance, Gambia and Senegal rivers (Hooghiemstra and Agwu, 1986). The percentages rapidly decrease seaward to 2% off Sierra Leone, and to 5% in the Gulf of Guinea (Melia, 1984).…”

Section: B) Modern Pollen Depositionmentioning

confidence: 96%

“…In contrast, pollen transport of Rhizophora by the Senegal River in bottom sediment samples is notable as far upstream as 250 km (5%) and up to 400 km seaward into the Atlantic (9%) (Lézine and Hooghiemstra, 1990). The highest Rhizophora percentages are recorded in sediments collected at a short distance from the coast off the source areas in Sierra Leone between 6 and 10 0 N latitude (Hooghiemstra and Agwu, 1986) (60%). They represent more than 30% in the Gulf of Guinea, off the well developed Rhizophora formation of the Niger delta (Dupont and Agwu, 1991), whereas they average only 6% (0-19%) off the Ivory Coast (Caratini et al, 1987), where the corresponding formation are strongly reduced.…”

Section: B) Modern Pollen Depositionmentioning

confidence: 96%

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Evolution of the West African Mangrove During the Late Quaternary: A Review

Lézine¹

2007

gpq

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The review of pollen data on mangrove pollen deposition in modern and late Quaternary sediments of West Africa points to two distinct signals linked to the sedimentary environment concerned. Along the littoral and on the slope of the continental shelf, mangrove peat deposits recording more than 40% of Rhizophora percentages reflect the postglacial sea-level rise and give evidence for the associated paleogeographical modifications (e.g. during the Nouakchottian transgression). Deep oceanic records show that the mangrove was present along the West African coasts during the Late Glacial Maximum reflecting local conditions of fresh water input and sea surface temperatures not as low as previously suggested. Mangrove developed after 12 500 BP as far north as 21°N; its maximum extension was recorded ca. 9500 BP reflecting the enhanced monsoon circulation over West Africa.

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Section: B) Modern Pollen Depositionmentioning

confidence: 96%

Section: B) Modern Pollen Depositionmentioning

confidence: 96%

Evolution of the West African Mangrove During the Late Quaternary: A Review

Lézine¹

2007

gpq

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“…The correlation of the influx of pollen and spores with the oxygen isotope curves indicates that the high values of influx of pollen and spores during the stages of large global ice volume are the result of enhanced trade winds. In this respect, there is a good correspondence between the pollen influx changes during oxygen isotope stages 5e through 5a in our core and in cores M16415 and M16416, which reflect changes in the vigour of the northeast trade winds (Hooghiemstra and Agwu 1988).…”

Section: Transport Agentsmentioning

confidence: 80%

Vegetation and climatic history of southwest Africa: A marine palynological record of the last 300,000 years

Shi

Dupont

1997

Veget Hist Archaebot

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Abstract.A continuous palynological record from the marine core GeoB1016-3 from the Angola Basin reveals the regional vegetation and climate history of the last 300 ka. Pollen and spores found at the studied site have their source areas in the different vegetation zones of the adjacent part of the West African continent. Those vegetation zones comprise tropical rain forest, coastal mangrove swamp, Miombo woodland, dry forest, Afromontane forest, desert and semi-desert. The main pollen transport agent is the southeast trade wind system. Ocean currents also partly play a role in transporting pollen and spores. During the interglacial periods, ocean currents also transported palynomorphs southward. During the glacial periods, increased trade winds are indicated by high influx of pollen and spores and high pollen percentages of Poaceae and taxa from desert and semidesert vegetations. Reconstruction of the geographical position of palaeo-vegetation zones shows that the northern boundary of the Namib Desert did not move north of 12°S during the last 300 ka. This implies that northward shifts of the Angola-Benguela Front did not pass the latitude of 12°S.

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“…Being a semi-enclosed basin and one of the biggest marginal seas of west Pacific, the South China Sea (SCS) is an ideal area for studies of climate and environment changes, because of its continuous records with high sedimentation rates and amplifying effect of the environmental signal [9,10] . In general, marine sediments can provide long continuous and undisturbed pollen sequences with accurate dating and, hence, enable us to reconstruct the history how terrestrial vegetation responded to climate changes [11][12][13][14] . ODP Site 1143 was drilled in spring of 1999 during ODP Leg 184 in the southern SCS within the "Western Pacific Warm Pool" [15] .…”

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confidence: 99%

Deep sea pollen record during 12–1.6 Ma from the southern South China Sea and its response to environmental change

Luo

Sun

2007

CHINESE SCI BULL

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Based on deep-sea pollen results (512-76 m) from ODP Site 1143 in the southern South China Sea (SCS), the climate and vegetation evolution sequence on the surrounding islands and the exposed continental shelf are discussed. The pollen records show that the pollen influx was quite low before 8.15 Ma and increased dramatically afterwards. The influx changes can be ascribed, on one side, to tectonics deformations around the southern SCS resulting in rapid uplift of islands and subsequent increase of the sediment rates and pollen influx and on the other side to climate cooling and monsoon enhancement. Around 2.63 Ma was another obvious boundary, the increasing of pollen and spores influx since this time was mainly related to global climate cooling. Spectrum analysis of pollen influx values shows that 2 Ma, 0.67 Ma, and 0.19-0.17 Ma cycles existed during 12-3.0 Ma, while 0.1 Ma and 46.9 ka cycles existed during 3.0-2.0 Ma.

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Changes in the vegetation and trade winds in equatorial northwest Africa 140,000–70,000 yr B.P. as deduced from two marine pollen records

Cited by 56 publications

References 9 publications

Evolution of the West African Mangrove During the Late Quaternary: A Review

Evolution of the West African Mangrove During the Late Quaternary: A Review

Vegetation and climatic history of southwest Africa: A marine palynological record of the last 300,000 years

Deep sea pollen record during 12–1.6 Ma from the southern South China Sea and its response to environmental change

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