Interpreting the <sup>13</sup>C/<sup>12</sup>C ratio of carbon dioxide in an urban airshed in the Yangtze River Delta, China
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Abstract. Observations of atmospheric CO2 molar fraction and its 13C isotope composition (δ13C) in urban airsheds provide constraints on the roles of anthropogenic and natural sources in local and regional C cycles. In this study, we report observations of these quantities in Nanjing at hourly intervals from March 2013 to August 2015 using a laser-based optical instrument. Nanjing is the second largest city located in the highly industrialized Yangtze River Delta (YRD), Eastern China. The mean CO2 molar fraction and 13C were 439.7 ppm and −8.48 ‰ over this observational period. The peak monthly mean δ13C (−7.44 ‰, July 2013) was 1.03 ‰ higher than that observed at the Mauna Loa Observatory. The highly enriched 13C signal was attributed to the influence of cement production in the region. By applying the Keeling plot and the Miller–Tans method to midnight and midday observations, respectively, we showed that the 13C signal of C sources in the Nanjing Municipality was 0.48 ‰ lower than that in the YRD. Flux partitioning calculations revealed that natural ecosystems in the YRD were a negligibly small sink of atmospheric CO2, consistent with the Carbon Tracker inverse modeling result.Keywords:
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The development status and existing problems on logistics policy are analyzed in Yangtze River Delta by defining coupled strategy and confirming its related main body. The objective, principle and coupled strategy of constructing basal logistics policy platform in Yangtze River Delta are confirmed. Then the overall objective target and policy direction of the coupled development of logistics industry in Yangtze River Delta are proposed. Based on the coupled strategy, a basal logistics policy platform in Yangtze River Delta is constructed, which can provide some help and guidance for building better policy environment for the coupled development of logistics industry in Yangtze River Delta.
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Cooperation in tourism is an important part of economic cooperation within the Yangtze River Delta.Based on related theories,the present paper makes a study on the background and present situation of the cooperation in this respect,as well as the many problems arising from its rapid development.Meanwhile,a series of strategies are proposed regarding its further development.
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China Yangtze River Delta is not only one of metropolis circles where economic and social development is on the top level, but also one of the most tourism developed regions. Guides are asked for improving their professional ability with the development of tourism. This article analyses and studies the charactes based on markets scales and features of tourists of Zhujiang Delta, Yangtze River Delta and Yellow River Delta, which are devided by region, features of markets and features of tourists. This article also offers some advices for guide about reception measures.
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In order to scientifically evaluate the competitiveness of yacht industry, an evaluation index system is established based on GEM model. The competitiveness of the yacht industrial in the Yangtze River Delta Area is calculated by using the GEM analytical method, and the relevant factors are analyzed. The results show that the GEM value of competitiveness of the yacht industrial in the Yangtze River Delta Area is 530,indicating that Yangtze River Delta Area has certain advantage, but not absolute advantage in the competitiveness of the yacht industry.
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