Pollen distribution in marine sediment samples along the south-western African coast
Fuente:
PANGAEA
Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2003
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1867170455884922880 |
|---|---|
| author | Dupont, Lydie M Wyputta, Ulrike |
| author_facet | Dupont, Lydie M Wyputta, Ulrike |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The distribution of pollen in marine sediments is used to reconstruct pathways of terrigenous input to the oceans and provides a record of vegetation change on adjacent continents. The wind transport routes of aeolian pollen is comprehensively illustrated by clusters of trajectories. Isobaric, 4-day backward trajectories are calculated using the modelled wind-field of ECHAM3, and are clustered on a seasonal basis to estimate the main pathways of aeolian particles to sites of marine cores in the south-eastern Atlantic. Trajectories and clusters based on the modelled wind-field of the Last Glacial Maximum hardly differ from those of the present-day. Trajectory clusters show three regional, and two seasonal patterns, determining the pathways of aeolian pollen transport into the south-eastern Atlantic ocean. Mainly, transport out of the continent occurs during austral fall and winter, when easterly and south-easterly winds prevail. South of 25°S, winds blow mostly from the west and southwest, and aeolian terrestrial input is very low. Generally, a good latitudinal correspondence exists between the distribution patterns of pollen in marine surface sediments and the occurrence of the source plants on the adjacent continent. The northern Angola Basin receives pollen and spores from the Congolian and Zambezian forests mainly through river discharge. The Zambezian vegetation zone is the main source area for wind-blown pollen in sediments of the Angola Basin, while the semi-desert and desert areas are the main sources for pollen in sediments of the Walvis Basin and on the Walvis Ridge. A transect of six marine pollen records along the south-western African coast indicates considerable changes in the vegetation of southern Africa between glacial and interglacial periods. Important changes in the vegetation are the decline of forests in equatorial Africa and the north of southern Africa and a northward shift of winter rain vegetation along the western escarpment. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_726897 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Pollen distribution in marine sediment samples along the south-western African coast Dupont, Lydie M Wyputta, Ulrike Angola Benguela Front; Angola Diapir Field; Center for Marine Environmental Sciences; Congo Fan; Eastern Niger fan; GeoB1028-5; GeoB1710-3; GeoB1722-1; GeoB2301-1; GeoB2302-1; GeoB2304-1; GeoB2305-1; GeoB2306-1; GeoB2307-1; GeoB2308-1; GeoB2309-1; GeoB2310-1; GeoB4901-6; GeoB4902-4; GeoB4903-3; GeoB4904-6; GeoB4905-2; GeoB4906-5; GeoB4908-4; GeoB4909-4; GeoB4910-4; GeoB4911-1; GeoB4912-3; GeoB4913-4; GeoB4914-5; GeoB4915-3; GeoB4916-4; GeoB4917-5; GeoB4918-4; Gravity corer (Kiel type); M20/2; M41/1; M6/6; MARUM; Meteor (1986); MUC; MultiCorer; Namibia continental slope; NE off San Thome; northern Congo fan; off Angola; off Cameroon; off Gabun; off northern Gabun; off south Gabun; PROBOSWA; SL; SO86; Sonne; southern Congo fan; Walvis Ridge, Southeast Atlantic Ocean The distribution of pollen in marine sediments is used to reconstruct pathways of terrigenous input to the oceans and provides a record of vegetation change on adjacent continents. The wind transport routes of aeolian pollen is comprehensively illustrated by clusters of trajectories. Isobaric, 4-day backward trajectories are calculated using the modelled wind-field of ECHAM3, and are clustered on a seasonal basis to estimate the main pathways of aeolian particles to sites of marine cores in the south-eastern Atlantic. Trajectories and clusters based on the modelled wind-field of the Last Glacial Maximum hardly differ from those of the present-day. Trajectory clusters show three regional, and two seasonal patterns, determining the pathways of aeolian pollen transport into the south-eastern Atlantic ocean. Mainly, transport out of the continent occurs during austral fall and winter, when easterly and south-easterly winds prevail. South of 25°S, winds blow mostly from the west and southwest, and aeolian terrestrial input is very low. Generally, a good latitudinal correspondence exists between the distribution patterns of pollen in marine surface sediments and the occurrence of the source plants on the adjacent continent. The northern Angola Basin receives pollen and spores from the Congolian and Zambezian forests mainly through river discharge. The Zambezian vegetation zone is the main source area for wind-blown pollen in sediments of the Angola Basin, while the semi-desert and desert areas are the main sources for pollen in sediments of the Walvis Basin and on the Walvis Ridge. A transect of six marine pollen records along the south-western African coast indicates considerable changes in the vegetation of southern Africa between glacial and interglacial periods. Important changes in the vegetation are the decline of forests in equatorial Africa and the north of southern Africa and a northward shift of winter rain vegetation along the western escarpment. |
| title | Pollen distribution in marine sediment samples along the south-western African coast |
| topic | Angola Benguela Front; Angola Diapir Field; Center for Marine Environmental Sciences; Congo Fan; Eastern Niger fan; GeoB1028-5; GeoB1710-3; GeoB1722-1; GeoB2301-1; GeoB2302-1; GeoB2304-1; GeoB2305-1; GeoB2306-1; GeoB2307-1; GeoB2308-1; GeoB2309-1; GeoB2310-1; GeoB4901-6; GeoB4902-4; GeoB4903-3; GeoB4904-6; GeoB4905-2; GeoB4906-5; GeoB4908-4; GeoB4909-4; GeoB4910-4; GeoB4911-1; GeoB4912-3; GeoB4913-4; GeoB4914-5; GeoB4915-3; GeoB4916-4; GeoB4917-5; GeoB4918-4; Gravity corer (Kiel type); M20/2; M41/1; M6/6; MARUM; Meteor (1986); MUC; MultiCorer; Namibia continental slope; NE off San Thome; northern Congo fan; off Angola; off Cameroon; off Gabun; off northern Gabun; off south Gabun; PROBOSWA; SL; SO86; Sonne; southern Congo fan; Walvis Ridge, Southeast Atlantic Ocean |
| url | https://doi.org/10.1594/PANGAEA.726897 |