Rainfall intensity–duration thresholds for bedload transport initiation in small Alpine watersheds Natural Hazards and Earth System Sciences DOI 10.5194/nhess-12-3091-2012 18 October 2012 In this study, the characteristics of rainfall events leading to bedload transport were investigated in five small Alpine catchments located in different geographical and morphological regions of Switzerland, Italy and France. Read more
High-resolution interpolar difference of atmospheric methane around the Last Glacial Maximum Biogeosciences DOI 10.5194/bg-9-3961-2012 16 October 2012 Here we present new high-resolution methane records from the North Greenland Ice Core Project and the European Project for Ice Coring in Antarctica Dronning Maud Land ice cores covering Termination 1, the Last Glacial Maximum, and parts of the last glacial back to 32 000 years before present. Read more
Contrasting trends of mass and optical properties of aerosols over the Northern Hemisphere from 1992 to 2011 Atmospheric Chemistry and Physics DOI 10.5194/acp-12-9387-2012 15 October 2012 This study compares the long-term variation of mass and optical properties of atmospheric aerosols over the Northern Hemisphere, including China, the US, Canada and Europe. Contrasting trends of mass and optical properties were found from 1992 to 2011. Read more
Particle backscatter and relative humidity measured across cirrus clouds and comparison with microphysical cirrus modelling Atmospheric Chemistry and Physics DOI 10.5194/acp-12-9135-2012 5 October 2012 Advanced measurement and modelling techniques are employed to estimate the partitioning of atmospheric water between the gas phase and the condensed phase in and around cirrus clouds, and thus to identify in-cloud and out-of-cloud supersaturations with respect to ice. Read more
Marine bacteria in deep Arctic and Antarctic ice cores: a proxy for evolution in oceans over 300 million generations Biogeosciences DOI 10.5194/bg-9-3799-2012 5 October 2012 Ice cores offer the opportunity to study evolution of marine microbes over ~ 300 million generations by analysing their genomes vs. depth in glacial ice over the last 700 000 yr as frozen proxies for changes in their genomes in oceans. Read more
It takes a community to raise a hydrologist: the Modular Curriculum for Hydrologic Advancement (MOCHA) Hydrology and Earth System Sciences DOI 10.5194/hess-16-3405-2012 21 September 2012 In this paper we combine literature review, community survey, discussion and assessment to provide a holistic baseline for the future of hydrology education. The ultimate objective of our educational initiative is to enable educators to train a new generation of “renaissance hydrologists,” who can master the holistic nature of our field and of the problems we encounter. Read more
Should we apply bias correction to global and regional climate model data? Hydrology and Earth System Sciences DOI 10.5194/hess-16-3391-2012 21 September 2012 With this article, we advocate communicating the entire uncertainty range associated with climate change predictions openly and hope to stimulate a lively discussion on bias correction among the atmospheric and hydrological community and end users of climate change impact studies. Read more
Diurnal variations of organic molecular tracers and stable carbon isotopic composition in atmospheric aerosols over Mt. Tai in the North China Plain: an influence of biomass burning Atmospheric Chemistry and Physics DOI 10.5194/acp-12-8359-2012 18 September 2012 This study demonstrates that crop-residue burning activities can significantly enhance the organic aerosol loading and alter the organic composition and stable carbon isotopic composition of aerosol particles in the troposphere over the North China Plain. Read more
Incorporating student-centered approaches into catchment hydrology teaching: a review and synthesis Hydrology and Earth System Sciences DOI 10.5194/hess-16-3263-2012 13 September 2012 As hydrologists confront the future of water resources on a globalized, resource-scarce and human-impacted planet, the educational preparation of future generations of water scientists becomes increasingly important. Read more
Occurrence of lower cloud albedo in ship tracks Atmospheric Chemistry and Physics DOI 10.5194/acp-12-8223-2012 12 September 2012 The concept of geoengineering by marine cloud brightening is based on seeding marine stratocumulus clouds with sub-micrometer sea-salt particles to enhance the cloud droplet number concentration and cloud albedo, thereby producing a climate cooling effect. The efficacy of this as a strategy for global cooling rests on the extent to which aerosol-perturbed marine clouds will respond with increased albedo. It is found that the sign (increase or decrease) and magnitude of the albedo response in ship tracks depends on the mesoscale cloud structure, the free tropospheric humidity, and cloud top height. Read more
