@article{fdi:010086333,
  title = {{M}illennial variability of terrigenous transport to the central-southern {P}eruvian margin during the last deglaciation (18-13 kyr {BP})},
  author = {{Y}seki, {M}. and {T}urcq, {B}runo and {C}aquineau, {S}andrine and {S}alvatteci, {R}. and {S}olis, {J}. and {S}kilbeck, {C}. {G}. and {V}elazco, {F}. and {G}utierrez, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}econstructing precipitation and wind from the geological record could help researchers understand the potential changes in precipitation and wind dynamics in response to climate change in {P}eru. {T}he last deglaciation offers natural experimental conditions to test the response of precipitation and wind dynamics to high-latitude forcing. {W}hile considerable research has been done to reconstruct precipitation variability during the last deglaciation in the {A}tlantic sector of {S}outh {A}merica, the {P}acific sector of {S}outh {A}merica has received little attention. {T}his work aims to fill this gap by reconstructing types of terrigenous transport to the central-southern {P}eruvian margin (12 and 14 degrees {S}) during the last deglaciation (18-13 kyr {BP}). {F}or this purpose, we used grain-size distribution in sediments of marine core {M}77/2005-3 ({C}allao, 12 degrees {S}) and core {G}14 ({P}isco, 14 degrees {S}). {W}e analyzed end-members ({EM}s) to identify grain-size components and reconstruct potential sources and transport processes of terrigenous material across time. {W}e identified four end-members for both {C}allao and {P}isco sediments. {I}n {C}allao, we propose that the changes in the contributions of {EM}4 (101 mu m) and {EM}2 (58 mu m) mainly reflect the hydrodynamic energy and diffuse sources, respectively, while the variations in {EM}3 (77 mu m) and {EM}1 (11 mu m) reflect changes in the eolian and fluvial inputs, respectively. {I}n {P}isco, where there are strong winds and an extensive coastal desert, changes in the contribution of {EM}1 (10 mu m) reflect changes in river inputs, while {EM}2 (52 mu m), {EM}3 (75 mu m), and {EM}4 (94 mu m) reflect an eolian origin. {A}t millennial scale, our record shows an increase in the fluvial inputs during the last part of {H}einrich {S}tadial 1 (similar to 16-14.7 kyr {BP}) at both locations. {T}his increase was linked to higher precipitation in the {A}ndes related to a reduction of the {A}tlantic {M}eridional {O}verturning {C}irculation and meltwater discharge in the {N}orth {A}tlantic. {I}n contrast, during the {B}olling-{A}llerod interstadial (degrees 14:7-13 kyr {BP}), there was an eolian input increase, associated with stronger winds and lower precipitation that indicate an expansion of the {S}outh {P}acific {S}ubtropical {H}igh. {T}hese conditions would correspond to a northern displacement of the {I}ntertropical {C}onvergence {Z}one-{S}outh {P}acific {S}ubtropical {H}igh system associated with a stronger {W}alker circulation. {O}ur results suggest that variations in river discharge and changes in surface wind intensity in the western margin of {S}outh {A}merica during the last deglaciation were sensitive to {A}tlantic {M}eridional {O}verturning {C}irculation variations and the {W}alker circulation on millennial timescales. {I}n the context of global warming, large-scale increases in precipitation and fluvial discharge in the {A}ndes as a result of a declining {A}tlantic {M}eridional {O}verturning {C}irculation and southward displacement of the {I}ntertropical {C}onvergence {Z}one should be considered.},
  keywords = {{PEROU} ; {PACIFIQUE} ; {ANDES} ; {ZONE} {SUBSTROPICALE}},
  booktitle = {},
  journal = {{C}limate of the {P}ast},
  volume = {18},
  numero = {10},
  pages = {2255--2269},
  ISSN = {1814-9324},
  year = {2022},
  DOI = {10.5194/cp-18-2255-2022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086333},
}