Arctic forest change in a warming climate

Jack Marchant的项目细节如下：标题：气候变暖中的北极森林变化概要：由于物种范围的变化，生物群落和它们之间的过渡带预计将在气候变化的影响下发生变化。其中一个非常重要的过渡带是北方森林向北极冻土带的过渡，随着气候变暖，森林有可能进入冻土带。主要植被类型的变化对能量平衡以及陆地和大气之间温室气体交换的标志和大小都有深远的潜在影响，这是地球上最广泛(按面积)的生态边界。反过来，这些变化可能会促进北极地区及其他地区进一步加剧变暖。因为这样的移动可能比简单的、均匀的、向极地移动的变化更多(Rees等人)。(2020)需要紧急关注的关键问题是：环北极地区的森林是否正在推进，如果是，速度是多少，在哪里，为什么？这个项目将建立在监督者以前的补充工作的基础上，确定森林结构和由于变化而可能发生的转变，将遥感和植物生态学方法结合起来，并借鉴其他人在北极周围地区最近的研究(Rees等人。2020年，以及其中的参考文献)作为一个坚实的起点。以遥感为主导的方法将使我们能够大大扩展到目前在北极各地报告的地点和相关研究的零星分布之外。在解决俄罗斯北极大部分地区缺乏相关信息的问题时，这一点尤其重要，因为在物理研究面临许多地缘政治挑战的时候。

Jack Marchant's project details are as follows:Title : Arctic forest change in a warming climateOutline:Biomes and the transition zones between them are expected to shift under the influence of a changing climate because of species' range shifts. One such very important transition zone is that of the boreal forest to arctic tundra and the potential for forest advance into tundra with climatic warming. Shifts in dominant vegetation type have profound potential impacts upon both energy balance, as well as sign and magnitude of exchanges of greenhouse gases between land and atmosphere, along what is Earth's most extensive (by area) ecological boundary. These shifts, in turn, may feedback to promote further enhanced warming across Arctic regions and beyond. Since such shifts may be more varied than a simple, uniform, poleward displacement (Rees et al. 2020) key questions requiring urgent attention are: whether or not forest advance is underway around the circumpolar Arctic and, if so, at what rates, where and why?This project will build upon previous, complementary, work of the supervisors in determining forest structure and potential transitions as a result of change, combining both remote sensing and plant ecology approaches, as well as drawing upon recent studies by others at localities around the circumpolar Arctic (Rees et al. 2020, and references therein) as a solid starting point. A remote-sensing-led approach will allow us to expand significantly beyond the currently rather patchy distribution of reported sites and associated studies at localities around the Arctic. This is particularly relevant at the current time when addressing the dearth of relevant information for much of the Russian Arctic at a time of many geopolitical challenges for physical study.