Stratigraphic evidence of a Megahumid climate between 10,000 and 4000 years B.P. in the western part of the Chinese Loess Plateau

Z. D. Feng, C. B. An, L. Y. Tang, A.J. Timothy Jull

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Our field surveys show that a wetland/swamp layer is widely distributed in the western part of the Chinese Loess Plateau. The grayish-blue and aquatic mollusk-enriched layer at Sujianwan section (typical in the major valleys) is dated between ∼10,000 and 4000 cal. years B.P. A wetland/swamp sub-layer and a pedogenically altered wetland/swamp sub-layer bracket a middle complex of wetland/swamp and fluvial alternating couplets at Dadiwan section (typical in the branch valleys). The middle complex formed between ∼8000 and 6000 cal. years B.P. and contains abundant aquatic mollusks, as well as the highest percentage of the tree and shrub pollens. We propose that four mechanisms might have shared the responsibility for generating and maintaining the Megehumid climate in the western part of the Chinese Loess Plateau. They are (1) the insolation peak (7% more than today's) between 12,000 and 8000 years B.P., (2) the increased late summer insolation about 6000 cal. years B.P. in the Northern Hemisphere, (3) the shift of the long-term El Nino-like system towards the Asian side of the Pacific, and (4) positive vegetation feedbacks under a wet and warm climate.

Original languageEnglish (US)
Pages (from-to)145-155
Number of pages11
JournalGlobal and Planetary Change
Volume43
Issue number3-4
DOIs
StatePublished - Nov 2004

Fingerprint

swamp
loess
wetland
plateau
climate
insolation
valley
El Nino
field survey
Northern Hemisphere
shrub
pollen
vegetation
summer

Keywords

  • Chinese Loess Plateau
  • Holocene changes
  • Megahumid

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Stratigraphic evidence of a Megahumid climate between 10,000 and 4000 years B.P. in the western part of the Chinese Loess Plateau. / Feng, Z. D.; An, C. B.; Tang, L. Y.; Jull, A.J. Timothy.

In: Global and Planetary Change, Vol. 43, No. 3-4, 11.2004, p. 145-155.

Research output: Contribution to journalArticle

@article{08a3c44834e742178e51e1f73f38d8c9,
title = "Stratigraphic evidence of a Megahumid climate between 10,000 and 4000 years B.P. in the western part of the Chinese Loess Plateau",
abstract = "Our field surveys show that a wetland/swamp layer is widely distributed in the western part of the Chinese Loess Plateau. The grayish-blue and aquatic mollusk-enriched layer at Sujianwan section (typical in the major valleys) is dated between ∼10,000 and 4000 cal. years B.P. A wetland/swamp sub-layer and a pedogenically altered wetland/swamp sub-layer bracket a middle complex of wetland/swamp and fluvial alternating couplets at Dadiwan section (typical in the branch valleys). The middle complex formed between ∼8000 and 6000 cal. years B.P. and contains abundant aquatic mollusks, as well as the highest percentage of the tree and shrub pollens. We propose that four mechanisms might have shared the responsibility for generating and maintaining the Megehumid climate in the western part of the Chinese Loess Plateau. They are (1) the insolation peak (7{\%} more than today's) between 12,000 and 8000 years B.P., (2) the increased late summer insolation about 6000 cal. years B.P. in the Northern Hemisphere, (3) the shift of the long-term El Nino-like system towards the Asian side of the Pacific, and (4) positive vegetation feedbacks under a wet and warm climate.",
keywords = "Chinese Loess Plateau, Holocene changes, Megahumid",
author = "Feng, {Z. D.} and An, {C. B.} and Tang, {L. Y.} and Jull, {A.J. Timothy}",
year = "2004",
month = "11",
doi = "10.1016/j.gloplacha.2004.05.001",
language = "English (US)",
volume = "43",
pages = "145--155",
journal = "Global and Planetary Change",
issn = "0921-8181",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Stratigraphic evidence of a Megahumid climate between 10,000 and 4000 years B.P. in the western part of the Chinese Loess Plateau

AU - Feng, Z. D.

AU - An, C. B.

AU - Tang, L. Y.

AU - Jull, A.J. Timothy

PY - 2004/11

Y1 - 2004/11

N2 - Our field surveys show that a wetland/swamp layer is widely distributed in the western part of the Chinese Loess Plateau. The grayish-blue and aquatic mollusk-enriched layer at Sujianwan section (typical in the major valleys) is dated between ∼10,000 and 4000 cal. years B.P. A wetland/swamp sub-layer and a pedogenically altered wetland/swamp sub-layer bracket a middle complex of wetland/swamp and fluvial alternating couplets at Dadiwan section (typical in the branch valleys). The middle complex formed between ∼8000 and 6000 cal. years B.P. and contains abundant aquatic mollusks, as well as the highest percentage of the tree and shrub pollens. We propose that four mechanisms might have shared the responsibility for generating and maintaining the Megehumid climate in the western part of the Chinese Loess Plateau. They are (1) the insolation peak (7% more than today's) between 12,000 and 8000 years B.P., (2) the increased late summer insolation about 6000 cal. years B.P. in the Northern Hemisphere, (3) the shift of the long-term El Nino-like system towards the Asian side of the Pacific, and (4) positive vegetation feedbacks under a wet and warm climate.

AB - Our field surveys show that a wetland/swamp layer is widely distributed in the western part of the Chinese Loess Plateau. The grayish-blue and aquatic mollusk-enriched layer at Sujianwan section (typical in the major valleys) is dated between ∼10,000 and 4000 cal. years B.P. A wetland/swamp sub-layer and a pedogenically altered wetland/swamp sub-layer bracket a middle complex of wetland/swamp and fluvial alternating couplets at Dadiwan section (typical in the branch valleys). The middle complex formed between ∼8000 and 6000 cal. years B.P. and contains abundant aquatic mollusks, as well as the highest percentage of the tree and shrub pollens. We propose that four mechanisms might have shared the responsibility for generating and maintaining the Megehumid climate in the western part of the Chinese Loess Plateau. They are (1) the insolation peak (7% more than today's) between 12,000 and 8000 years B.P., (2) the increased late summer insolation about 6000 cal. years B.P. in the Northern Hemisphere, (3) the shift of the long-term El Nino-like system towards the Asian side of the Pacific, and (4) positive vegetation feedbacks under a wet and warm climate.

KW - Chinese Loess Plateau

KW - Holocene changes

KW - Megahumid

UR - http://www.scopus.com/inward/record.url?scp=8544243533&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=8544243533&partnerID=8YFLogxK

U2 - 10.1016/j.gloplacha.2004.05.001

DO - 10.1016/j.gloplacha.2004.05.001

M3 - Article

AN - SCOPUS:8544243533

VL - 43

SP - 145

EP - 155

JO - Global and Planetary Change

JF - Global and Planetary Change

SN - 0921-8181

IS - 3-4

ER -