Quantifying aerosol mixing state with entropy and diversity measures Atmospheric Chemistry and Physics DOI 10.5194/acp-13-11423-2013 25 November 2013 This paper presents the first quantitative metric for aerosol population mixing state, defined as the distribution of per-particle chemical species composition. Read more
Paleosols in the Transantarctic Mountains: indicators of environmental change Solid Earth DOI 10.5194/se-4-451-2013 20 November 2013 Paleosols on unconsolidated deposits are emphasized in this study. Examples are given from the McMurdo Dry Valleys (78° S) and two outlet glaciers in the central and southern TAMS, including the Hatherton–Darwin Glacier region (80° S) and the Beardmore Glacier region (85°30’ S). Read more
Inverse streamflow routing Hydrology and Earth System Sciences DOI 10.5194/hess-17-4577-2013 19 November 2013 Here we develop a methodology to invert the routing process, i.e., to derive the spatially distributed runoff from streamflow (e.g., measured at gauge stations) by inverting an arbitrary linear routing model using fixed interval smoothing. Read more
Peak glacial 14C ventilation ages suggest major draw-down of carbon into the abyssal ocean Climate of the Past DOI 10.5194/cp-9-2595-2013 15 November 2013 Here we present a new, though still fragmentary, ocean-wide Δ14C data set showing that during the Last Glacial Maximum (LGM) and Heinrich Stadial 1 (HS-1) the maximum 14C age difference between ocean deep waters and the atmosphere exceeded the modern values by up to 1500 14C yr, in the extreme reaching 5100 14C yr. Read more
Heterogeneous formation of polar stratospheric clouds – Part 2: Nucleation of ice on synoptic scales Atmospheric Chemistry and Physics DOI 10.5194/acp-13-10769-2013 6 November 2013 This paper provides compelling evidence for the importance of heterogeneous nucleation, likely on solid particles of meteoritic origin, and of small-scale temperature fluctuations, for the formation of ice particles in the Arctic stratosphere. Read more
Where to find 1.5 million yr old ice for the IPICS “Oldest-Ice” ice core Climate of the Past DOI 10.5194/cp-9-2489-2013 5 November 2013 The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be found in the Antarctic ice sheet Read more
Ratios among atmospheric trace gases together with winds imply exploitable information for bird navigation: a model elucidating experimental results Biogeosciences DOI 10.5194/bg-10-6929-2013 4 November 2013 A model of avian goal-oriented navigation is described that is based on two empirical findings building a bridge from ornithology to atmospheric chemistry. Read more
A thermodynamic approach to link self-organization, preferential flow and rainfall–runoff behaviour Hydrology and Earth System Sciences DOI 10.5194/hess-17-4297-2013 1 November 2013 This study investigates whether a thermodynamically optimal hillslope structure can, if existent, serve as a first guess for uncalibrated predictions of rainfall–runoff. Read more
Filamentary structure in chemical tracer distributions near the subtropical jet following a wave breaking event Atmospheric Chemistry and Physics DOI 10.5194/acp-13-10517-2013 31 October 2013 This paper presents a set of observations and analyses of trace gas cross sections in the extratropical upper troposphere/lower stratosphere (UTLS). Read more
Nitrous Oxide (N2O) production in axenic Chlorella vulgaris microalgae cultures: evidence, putative pathways, and potential environmental impacts Biogeosciences DOI 10.5194/bg-10-6737-2013 25 October 2013 Using antibiotic assays and genomic analysis, this study demonstrates nitrous oxide (N2O) is generated from axenic Chlorella vulgaris cultures. In batch assays, this production is magnified under conditions favouring intracellular nitrite accumulation, but repressed when nitrate reductase (NR) activity is inhibited. Read more
