Regional Variability in Carbon and Energy Fluxes: Towards a Global Synthesis

OPP-9732105 OECHEL，沃尔特圣迭戈州立大学该项目将利用卫星、飞机和地面测量来检查全球气候和北极苔原系统相互作用产生的气体和能量通量。将确定北极冻土带对全球大气二氧化碳气体浓度的贡献，以了解北极地区在全球变化中的作用。之前的研究表明，在不同的季节和不同的年份，冻土带既可以是二氧化碳的来源，也可以是二氧化碳的汇。这项研究将把早期的结果从单一分水岭扩展到环极尺度，以了解控制北极二氧化碳排放或吸收的大范围过程。对这些过程的了解对于预测如果气候变暖或如果更多的碳将被封存，北极苔原地区是否会释放更多温室气体至关重要。该项目的实地测量和模拟结果将与其他陆地-大气-冰相互作用项目结合使用，以确定全球变化对北极陆地系统或由北极陆地系统造成的区域影响。

ABSTRACT OPP-9732105 OECHEL, WALTER SAN DIEGO STATE UNIVERSITY The project will utilize satellite, aircraft and ground-based measurements to examine gas and energy fluxes resulting from the interaction of global climate and arctic tundra systems. The contribution of arctic tundra to global atmospheric carbon dioxide gas concentration will be determined in order to understand the role of arctic regions in global change. Previous studies have shown that tundra can be either a source or sink of carbon dioxide in different seasons and different years. This study will expand the earlier results from a single watershed to a circumpolar scale in order to understand the large-scale processes controlling carbon dioxide emission or uptake in the Arctic. Knowledge of the processes is crucial to predicting whether the Arctic tundra regions will release more greenhouse gases if climate warms or if more carbon will be sequestered. The field measurements and modeling results of this project will be used in combination with other land-atmosphere-ice interaction projects to determine the regional impacts of global change on or by terrestrial systems in the Arctic.