Holocene and Last Glacial Maximum dust deposition rate: Updated datasets and interpolated fields

COSENTINO, NICOLÁS; TORRE, GABRIELA; LAMBERT, FABRICE; ALBANI, SAMUEL

Roma

Congreso; XXI INQUA Congress 2023; 2023

International Union for Quaternary Research

Mineral dust aerosols are a key component of the Earth system, as their dynamics are controlled by and affect climate through diverse mechanisms. To quantify the role of dust on climate variability at glacial-interglacial time scales, it is key to retrieve information on past dust activity as registered geologically in loess deposits, peat bogs, lake and marine sediments, and ice. The two main dust parameters that can be quantified from these archives include deposition rate and particle size distribution. Quantifying these parameters is essential for guiding Earth system simulations with prognostic dust.Several compilations of these parameters exist spanning the last ∼30 thousand years before present (ka BP), the newest released seven years ago. During these last years, there has been significant progress in the global coverage of paleo-dust proxies. Here, we update these previous compilations of global paleo-dust deposition flux and grain size observations. Two improvements are introduced. First, given the expected high variability of dust deposition fluxes during the last deglaciation, this new compilation discriminates between pre-industrial Holocene (PIH, year 1850 AD-11.7 ka BP) and Last Glacial Maximum (LGM, 19.0-26.5 ka BP) observations, filtering out dust flux constraints corresponding to the last deglaciation. Second, we derive an explicit uncertainty of bulk and