Gravitational separation in the stratosphere – a new indicator of atmospheric circulation Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8787-2013 3 September 2013 The O2/N2 ratio observed in the middle stratosphere, corrected for gravitational separation, showed the same mean air age as estimated from the CO2 mole fraction. Therefore, gravitational separation is usable as a new indicator of changes in the atmospheric circulation in the stratosphere. Read more
North–south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses Climate of the Past DOI 10.5194/cp-9-2043-2013 2 September 2013 On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north–south transect, data collected in the central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and temporal coherency. Read more
Climate response to imposed solar radiation reductions in high latitudes Earth System Dynamics DOI 10.5194/esd-4-301-2013 2 September 2013 The results of this paper suggest that, until emissions reductions are sufficient to limit the warming influence of increasing greenhouse gas concentrations, polar reductions in solar radiation, if they could be efficiently and effectively implemented, warrant further research as an approach to moderating the early stages of both high-latitude and global warming. Read more
Consistent increase in Indian monsoon rainfall and its variability across CMIP-5 models Earth System Dynamics DOI 10.5194/esd-4-287-2013 28 August 2013 The possibility of an impact of global warming on the Indian monsoon is of critical importance for the large population of this region. Future projections within the Coupled Model Intercomparison Project Phase 3 (CMIP-3) showed a wide range of trends with varying magnitude and sign across models. Here the Indian summer monsoon rainfall is evaluated in 20 CMIP-5 models for the period 1850 to 2100. Read more
Quantitative evaluation of emission controls on primary and secondary organic aerosol sources during Beijing 2008 Olympics Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8303-2013 22 August 2013 To assess the primary and secondary sources of fine organic aerosols after the aggressive implementation of air pollution controls during the 2008 Beijing Olympic Games, 12 h PM2.5 values were measured at an urban site at Peking University (PKU) and an upwind rural site at Yufa during the CAREBEIJING-2008 (Campaigns of Air quality REsearch in BEIJING and surrounding region) summer field campaign. Read more
Editorial: The publication of geoscientific model developments v1.0 Geoscientific Model Development DOI 10.5194/gmd-6-1233-2013 14 August 2013 In this editorial, GMD Executive Editors assess the lessons learned over the first few years of the journal’s life, and describe some changes to GMD’s editorial policy, which will ensure that the models and model developments are published in such a way that they are of maximum value to the community. Read more
Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7683-2013 9 August 2013 Experiments were conducted to investigate light absorption of organic aerosol in fresh and photo-chemically aged biomass-burning emissions. Read more
ACE-FTS observations of acetonitrile in the lower stratosphere Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7405-2013 2 August 2013 This work reports the first infrared satellite remote-sensing measurements of acetonitrile (CH3CN) in the Earth’s atmosphere using solar occultation measurements made by the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) between 2004 and 2011. Read more
A decadal satellite analysis of the origins and impacts of smoke in Colorado Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7429-2013 2 August 2013 We analyze the record of aerosol optical depth (AOD) measured by the MODerate resolution Imaging Spectroradiometer (MODIS) aboard the Terra satellite in combination with surface PM2.5 to investigate the impact of fires on aerosol loading and air quality over Colorado from 2000 to 2012, and to evaluate the contribution of local versus transported smoke. Read more
LGM permafrost distribution: how well can the latest PMIP multi-model ensembles perform reconstruction? Climate of the Past DOI 10.5194/cp-9-1697-2013 1 August 2013 Here, global-scale frozen ground distribution from the Last Glacial Maximum (LGM) has been reconstructed using multi-model ensembles of global climate models, and then compared with evidence-based knowledge and earlier numerical results. Read more
