The remote response of the South Asian Monsoon to reduced dust emissions and Sahara greening during the middle Holocene Journal Article uri icon

Overview

abstract

  • Abstract. Previous studies based on multiple paleoclimate archives suggested; a prominent intensification of the South Asian Monsoon (SAM) during the; mid-Holocene (MH, ∼6000 years before present). The main; forcing that contributed to this intensification is related to changes in; the Earth's orbital parameters. Nonetheless, other key factors likely played; important roles, including remote changes in vegetation cover and airborne; dust emission. In particular, northern Africa also experienced much wetter; conditions and a more mesic landscape than today during the MH (the; so-called African Humid Period), leading to a large decrease in airborne; dust globally. However, most modeling studies investigating the SAM changes; during the Holocene overlooked the potential impacts of the vegetation and; dust emission changes that took place over northern Africa. Here, we use a; set of simulations for the MH climate, in which vegetation over the Sahara; and reduced dust concentrations are considered. Our results show that SAM; rainfall is strongly affected by Saharan vegetation and dust concentrations,; with a large increase in particular over northwestern India and a; lengthening of the monsoon season. We propose that this remote influence is; mediated by anomalies in Indian Ocean sea surface temperatures and may have; shaped the evolution of the SAM during the termination of the African Humid; Period.;

publication date

  • June 17, 2021

has restriction

  • gold

Date in CU Experts

  • February 14, 2022 4:38 AM

Full Author List

  • Pausata FSR; Messori G; Yun J; Jalihal CA; Bollasina MA; Marchitto TM

author count

  • 6

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1814-9332

Additional Document Info

start page

  • 1243

end page

  • 1271

volume

  • 17

issue

  • 3