Extended Data Fig. 2: Mass and number density spectra of the grain-size dataset.
From: Chicxulub impact winter sustained by fine silicate dust
a Mass density spectrum of Tanis sediment sample X-2761-8A displayed by filled orange circles, which corresponds to the uppermost K-Pg claystone interval just below a Paleocene lignite and yields a median grain-size of 2.88 µm. The measured mass density spectrum was fitted by a trimodal lognormal size distribution as depicted by the blue solid line. This fitted model curve is the sum of lognormal size distributions comprising 3 modes. Model parameters are as follows: w0 = 0.002, Dpg,0 = 0.18 μm, lnσg,0 = 0.3087 (mode 1, green solid line), w0 = 0.125, Dpg,0 = 2.6 μm, lnσg,0 = 1.1193 (mode 2, cyan solid line), w0 = 0.01, Dpg,0 = 30 μm, lnσg,0 = 0.7284 (mode 3, magenta solid line), b Converted grain-size distribution into number density spectrum displayed by filled cyan circles. The converted spectrum is fitted by a lognormal size distribution (blue solid line), which is the input parameter for our GCM study. Converted model median grain-size corresponds to 0.125 µm with a logarithmic standard deviation of 0.446.
