Probing the position of the Jakarta metropolitan area in global inter-urban networks through the lens of manufacturing firms

This paper presents an analysis of the position of the Jakarta metropolitan area (JMA) in global inter-urban networks. Our starting point is our aim to provide a more nuanced understanding of the JMA’s connectivity in world city networks (WCNs). To this end, we steer clear of top-down approaches, which tend to analyze cities in singular taxonomies of global prominence, and instead propose a framework that is attuned to the JMA’s contexts to provide an alternative and complementary reading of how the JMA has been inserted into the WCN. To this end, by drawing on the interlocking network model, which helps to proxy inter-urban networks based on the multi-locational operations of manufacturing firms, we examine the JMA’s network positionality on the global and national scales. The results provide evidence of the JMA’s global inter-city relations being strongly geared toward East Asian cities. In addition, the results suggest that the JMA cannot be detached from its national geography, as evidenced by its strong connections with cities located on the island of Java

The potential impact on atmospheric ozone and temperature of increasing trace gas concentrations

The response of the atmosphere to emissions of chlorofluorocarbons (CFCs) and other chlorocarbons, and to increasing concentrations of other radiatively active trace gases such as CO2, CH4, and N2O is calculated by a coupled chemical-radiative transport one-dimensional model. It is shown that significant reductions in the ozone concentration and in the temperature are expected in the upper stratosphere as a result of increasing concentrations of active chlorine produced by photodecomposition of the CFCs. The ozone content is expected to increase in the troposphere, as a consequence of increasing concentrations of methane and nitrogen oxides. Due to enhanced greenhouse effects, the Earth's surface should warm up by several degrees. The amplitude and even the sign of future changes in the ozone column are difficult to predict as they are strongly scenario-dependent. An early detection system to prevent noticeable ozone changes as a result of increasing concentrations of source gases should thus be based on a continuous monitoring of the ozone amount in the upper stratosphere rather than on measurements of the ozone column only. Measurements of NOx, Clx, and HOx are also required for unambiguous trend detection and interpretation