Early anthropogenic CH4 emissions and the variation of CH4 and (CH4)-C-13 over the last millennium

This study presents a new hypothesis to explain the observed variation of C

Low atmospheric CO2 levels during the Little Ice Age due to cooling-induced terrestrial uptake

Low atmospheric carbon dioxide (CO2) concentration during the Little Ice Age has been used to derive the global carbon cycle sensitivity to temperature. Recent evidence confirms earlier indications that the low CO2 was caused by increased terrestrial carbon storage. It remains unknown whether the terrestrial biosphere responded to temperature variations, or there was vegetation re-growth on abandoned farmland. Here we present a global numerical simulation of atmospheric carbonyl sulfide concentrations in the pre-industrial period. Carbonyl sulfide concentration is linked to changes in gross primary production and shows a positive anomaly during the Little Ice Age. We show that a decrease in gross primary production and a larger decrease in ecosystem respiration is the most likely explanation for the decrease in atmospheric CO2 and increase in atmospheric carbonyl sulfide concentrations. Therefore, temperature change, not vegetation re-growth, was the main cause of the increased terrestrial carbon storage. We address the inconsistency between ice-core CO2 records from different sites measuring CO2 and δ13CO2 in ice from Dronning Maud Land (Antarctica). Our interpretation allows us to derive the temperature sensitivity of pre-industrial CO2 fluxes for the terrestrial biosphere (γL = -10 to -90 Pg C K-1), implying a positive climate feedback and providing a benchmark to reduce model uncertainties

Past and future carbon fluxes from land use change, shifting cultivation and wood harvest

Carbon emissions from anthropogenic land use (LU) and land use change (LUC) are quantified with a Dynamic Global Vegetation Model for the past and the 21st century following Representative Concentration Pathways (RCPs). Wood harvesting and parallel abandonment and expansion of agricultural land in areas of shifting cultivation are explicitly simulated (gross LUC) based on the Land Use Harmonization (LUH) dataset and a proposed alternative method that relies on minimum input data and generically accounts for gross LUC. Cumulative global LUC emissions are 72 GtC by 1850 and 243 GtC by 2004 and 27–151 GtC for the next 95 yr following the different RCP scenarios. The alternative method reproduces results based on LUH data with full transition information within <0.1 GtC/yr over the last decades and bears potential for applications in combination with other LU scenarios. In the last decade, shifting cultivation and wood harvest within remaining forests including slash each contributed 19% to the mean annual emissions of 1.2 GtC/yr. These factors, in combination with amplification effects under elevated CO2, contribute substantially to future emissions from LUC in all RCPs

Rationalizing ideologies, social identities and corruption among civil servants in Indonesia during the Suharto era

This study investigated how the social identities assumed by individuals as part of their professional roles influence the nature and use of a range of rationalizations for their corruption or the corrupt acts of others. Thirty senior Indonesian public servants were interviewed about the causes and factors that perpetuated corruption during the Suharto era, and how they rationalized corrupt behavior within the role of being a civil servant. Findings revealed that corruption was routine and embedded in the daily activities and administrative structures of Indonesian public servants. Rationalizing ideologies that supported corruption included a denial of responsibility, social weighting and an appeal to higher loyalties. Central to these rationalizations were explanations around the low levels of civil service salaries, poor accountability, and corrupt leadership at senior levels of the government. However, the expression of these rationalizations varied across three social or role identities of the Indonesian civil servant: the professional civil servant, the collegial civil servant, and the corrupt civil servant. The implications of these findings for interventions in organizations in developing countries are discussed