eprintid: 10195473
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/19/54/73
datestamp: 2024-08-06 14:04:16
lastmod: 2024-08-06 14:04:16
status_changed: 2024-08-06 14:04:16
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Zhao, Anni
creators_name: Feng, Ran
creators_name: Brierley, Chris M
creators_name: Zhang, Jian
creators_name: Hu, Yongyun
title: Aerosol uncertainties in tropical precipitation changes for the mid-Pliocene warm period
ispublished: pub
divisions: UCL
divisions: B03
divisions: C03
divisions: F26
note: Copyright © Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
abstract: The mid-Pliocene Warm Period (mPWP, 3.3-3.0gMa) was characterised by an atmospheric CO2 concentration exceeding 400gppmv with minor changes in continental and orbital configurations. Simulations of this past climate state have improved with newer models but still show some substantial differences from proxy reconstructions. There is little information about atmospheric aerosol concentrations during the Pliocene, but previous work suggests that it could have been quite different from the modern period. Here we apply idealised aerosol scenario experiments to examine the importance of aerosol forcing on mPWP tropical precipitation and the possibility of aerosol uncertainty explaining the mismatch between reconstructions and simulations. The absence of industrial pollutants leads to further warming, especially in the Northern Hemisphere. The Intertropical Convergence Zone (ITCZ) becomes narrower and stronger and shifts northward after removal of anthropogenic aerosols. Though not affecting the location of monsoon domain boundary, removal of anthropogenic aerosol alters the amount of rainfall within the domain, increasing summer rain rate over eastern and southern Asia and western Africa. This work demonstrates that uncertainty in aerosol forcing could be the dominant driver in tropical precipitation changes during the mid-Pliocene: causing larger impacts than the changes in topography and greenhouse gases.
date: 2024-05-23
date_type: published
publisher: COPERNICUS GESELLSCHAFT MBH
official_url: https://doi.org/10.5194/cp-20-1195-2024
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2282806
doi: 10.5194/cp-20-1195-2024
lyricists_name: Brierley, Christopher
lyricists_id: CCBBR95
actors_name: Brierley, Christopher
actors_id: CCBBR95
actors_role: owner
funding_acknowledgements: [National Natural Science Foundation of China]; [National Science Foundation]; [National Center for Atmospheric Research]
full_text_status: public
publication: Climate of the Past
volume: 20
number: 5
pagerange: 1195-1211
pages: 17
issn: 1814-9324
citation:        Zhao, Anni;    Feng, Ran;    Brierley, Chris M;    Zhang, Jian;    Hu, Yongyun;      (2024)    Aerosol uncertainties in tropical precipitation changes for the mid-Pliocene warm period.                   Climate of the Past , 20  (5)   pp. 1195-1211.    10.5194/cp-20-1195-2024 <https://doi.org/10.5194/cp-20-1195-2024>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10195473/1/cp-20-1195-2024.pdf