Screening of cloud microorganisms isolated at the Puy de Dôme (France) station for the production of biosurfactants Atmospheric Chemistry and Physics DOI 10.5194/acp-16-12347-2016 29 September 2016 A total of 480 microorganisms collected from 39 clouds sampled in France were isolated and identified. This unique collection was screened for biosurfactant production by measuring the surface tension. 41 % of the tested strains were active producers.Pseudomonas, the most frequently detected genus in clouds, was the dominant group for the production of biosurfactants. Further, the potential impact of the production of biosurfactants by cloud microorganisms on atmospheric processes is discussed. Read more
First characterization and validation of FORLI-HNO3 vertical profiles retrieved from IASI/Metop Atmospheric Measurement Techniques DOI 10.5194/amt-9-4783-2016 27 September 2016 HNO3 concentrations are obtained from the IASI instrument and the data set is characterized for the first time in terms of vertical profiles, averaging kernels and error profiles. A validation is also conducted through a comparison with ground-based FTIR measurements, with good results. The data set is then used to analyse HNO3 spatial and temporal variability for the year 2011. The latitudinal gradient and the large seasonal variability in polar regions are well represented with IASI data. FORLI-HNO3 vertical profiles retrieved from IASI/Metop">Read more
Quantifying ice loss in the eastern Himalayas since 1974 using declassified spy satellite imagery The Cryosphere DOI 10.5194/tc-10-2203-2016 23 September 2016 Here we utilize declassified spy satellite imagery to quantify ice volume loss of glaciers in the eastern Himalayas over approximately the last three decades. Clean-ice and debris-covered glaciers show similar magnitudes of ice loss, while calving glaciers are contributing a disproportionately large amount to total ice loss. Results highlight important physical processes affecting the ice mass budget and associated water resources in the Himalayas. Read more
Oxidation of sulfides and rapid weathering in recent landslides Earth Surface Dynamics DOI 10.5194/esurf-4-727-2016 22 September 2016 Rapid dissolution of bedrock and regolith mobilised by landslides can be an important control on rates of overall chemical weathering in mountain ranges. In this study we analysed a number of landslides and rivers in Taiwan to better understand why this occurs. We find that sulfuric acid resulting from rapid oxidation of highly reactive sulfides in landslide deposits drives the intense weathering and can set catchment-scale solute budgets. This could be a CO2source in fast-eroding mountains. Read more
Muographic data analysis method for medium-sized rock overburden inspections Geoscientific Instrumentation, Methods and Data Systems DOI 10.5194/gi-5-427-2016 21 September 2016 A paper focusing on the application of elementary particle physics to the measurements of rock overburden density structures that might be directly applicable to natural resources and undiscovered cave explorations, and even to searching for hidden chambers in historic architectural structures. Read more
A geological model for the management of subsurface data in the urban environment of Barcelona and surrounding area Solid Earth DOI 10.5194/se-7-1317-2016 16 September 2016 This study shows the need for a symbiotic relationship between government and research groups for efficient management of geologic data in urban environments. Through its implementation, both the city administration and private companies benefit from the feedback of geologic knowledge acquired during this process, thereby substantially reducing the cost of construction projects and facilitating the development of aquifer management plans. Read more
Dispersion in deep polar firn driven by synoptic-scale surface pressure variability The Cryosphere DOI 10.5194/tc-10-2099-2016 15 September 2016 The upper 50–100 m of the world’s ice sheets consists of the firn layer, a porous layer of snow that is slowly compacted by overlying snow. Understanding air movement inside the firn is critical for ice core climate reconstructions. Buizert and Severinghaus identify and describe a new mechanism of firn air movement. High- and low-pressure systems force air movement in the firn that drives strong mixing, called dispersion. Dispersion is the main mechanism for air mixing in the deep firn. Read more
Sea-ice indicators of polar bear habitat The Cryosphere DOI 10.5194/tc-10-2027-2016 14 September 2016 Polar bears, found in 19 distinct regions of the Arctic, depend on sea ice as a platform for hunting. Using satellite data of sea ice for the period 1979–2014, we found that the date of sea-ice retreat in spring is arriving weeks earlier, and the date of sea-ice advance in fall is arriving weeks later, in all 19 regions. We calculated several other measures of sea ice, which all show declines. These measures were designed to be useful for management agencies to assess polar bear habitat. Read more
Using present-day observations to detect when anthropogenic change forces surface ocean carbonate chemistry outside preindustrial bounds Biogeosciences DOI 10.5194/bg-13-5065-2016 13 September 2016 Ocean carbonate observations from surface buoys reveal that marine life is currently exposed to conditions outside preindustrial bounds at 12 study locations around the world. Seasonal conditions in the California Current Ecosystem and Gulf of Maine also exceed thresholds that may impact shellfish larvae. High-resolution observations place long-term change in the context of large natural variability: a necessary step to understand ocean acidification impacts under real-world conditions. Read more
Long-term visibility variation in Athens (1931–2013): a proxy for local and regional atmospheric aerosol loads Atmospheric Chemistry and Physics DOI 10.5194/acp-16-11219-2016 12 September 2016 Historical time series are unique sources of information for past climate and atmospheric composition change. The 82-year time series of visibility data collected at the National Observatory of Athens (NOA) was an excellent proxy for the long-term evolution of particulate pollution in the eastern Mediterranean, at times when direct aerosol measurements were missing. Evolution of particulate pollution of both local and regional origin is nicely reflected on visibility records of NOA. Read more
