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Paul Miller

Universitetslektor

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Dynamic Vegetation Simulations of the Mid-Holocene Green Sahara

Författare

  • Lu Zhengyao
  • Paul Miller
  • Qiong Zhang
  • Qiang Zhang
  • David Wårlind
  • Lars Nieradzik
  • Jesper Sjolte
  • Benjamin Smith

Summary, in English

The “Green Sahara” is a period when North Africa was characterized by vegetation cover and wetlands. To qualitatively identify the orbital-climatic causation of the Green Sahara regime, we performed dynamic vegetation model (LPJ-GUESS) simulations, driven by climate forcings from coupled general circulation model (EC-Earth) simulations for the mid-Holocene, in which the vegetation is prescribed to be either modern desert or artificially vegetated with a reduced dust load. LPJ-GUESS simulates a vegetated Sahara covered by both herbaceous and woody vegetation types consistent with proxy reconstructions only in the latter scenario. Sensitivity experiments identify interactions required to capture the northward extension of vegetation. Increased precipitation is the main driver of the vegetation extent changes, and the temperature anomalies determine the plant functional types mainly through altered fire disturbance. Furthermore, the simulated vegetation composition also depends on the correct representation of soil texture in a humid environment like Green Sahara.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • eSSENCE: The e-Science Collaboration
  • Centrum för miljö- och klimatvetenskap (CEC)
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • MERGE: ModElling the Regional and Global Earth system
  • Kvartärgeologi

Publiceringsår

2018-08-20

Språk

Engelska

Sidor

8294-8303

Publikation/Tidskrift/Serie

Geophysical Research Letters

Volym

45

Issue

16

Dokumenttyp

Artikel i tidskrift

Förlag

American Geophysical Union (AGU)

Ämne

  • Physical Geography

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1944-8007