Macquarie Island Aerobiology and Wind Climate Project: Phase 3

Metadata record for data from ASAC Project 246See the link below for public details on this project.From the abstract of the referenced paper:Analyses of data collected during the summer of 1979-80 from pollen traps and a flag tatter experiment along a transect across Macquarie Island, between Bauer Bay and Sandy Bay, suggest that the most sheltered locations are in the lee of prominent ridges, especially below the eastern coastal cliff tops, but also, paradoxically, on the lower slopes of the windward (west) coast. The presence of feldmark community pollen grains from 'downwind' and higher altitudes in the west coast pollen traps indicates that, during the period here documented, the island formed a topographic barrier such that when there were winds from westerly quarters of sufficient velocity, not only would the predictable lee side rotor circulations have been produced, but also a trapped windward (west coast) rotor that, at low altitudes, would have run counter to the prevailing winds. Flag tatter data from the most exposed sites indicate local wind climates of greater severity than any measured in the same way at comparable maritime latitudes across similar topographic barriers elsewhere. It can be inferred that windward rotors are not uncommon on Macquarie Island.The effectiveness of Macquarie Island as a barrier to local ocean and atmospheric circulation is a function of balances between tectonic and denudational (including marine) processes and glacial eustasy, and would have varied over time. This, and the resulting effect of local wind circulation on fallout patterns, need to be considered when interpreting pollen diagrams.

本数据集为ASAC项目246的元数据记录，详见下方链接以获取该项目的公开详情：
所引用论文的摘要内容如下：
对1979-1980年夏季在麦夸里岛（Macquarie Island）鲍尔湾（Bauer Bay）与桑迪湾（Sandy Bay）间的样带上采集的花粉陷阱（pollen traps）与旗布磨损实验（flag tatter experiment）数据开展的分析显示，植被遮蔽最充分的区域位于显著山脊的背风侧，尤其是东部海岸崖顶下方，但反常的是，迎风（西侧）海岸的低坡地带同样存在这类遮蔽区域。
在西海岸花粉陷阱中检出来自「下风向」及更高海拔区域的石质苔原群落（feldmark community）花粉颗粒，这一结果表明：在本研究记录的时段内，麦夸里岛构成了一道地形屏障——当出现足够强度的西风系气流时，不仅会形成可预测的背风侧旋翼环流，还会在迎风侧（西海岸）形成受困的旋翼环流，这类环流在低海拔区域会与盛行风向相反。
对暴露程度最高的站点采集的旗布磨损实验数据显示，该区域的局地风况严酷程度，高于其他地区同类地形屏障周边、同纬度海洋性区域采用相同方法测得的风况。
由此可推断，迎风侧旋翼环流在麦夸里岛并非罕见现象。
麦夸里岛对局地海洋与大气环流的屏障效能，取决于构造作用、剥蚀作用（含海洋剥蚀）与冰川海面变化（glacial eustasy）之间的动态平衡，且该效能会随时间发生变化。
在解释花粉图谱（pollen diagrams）时，需考虑这一屏障效能的动态变化，以及局地风环流对花粉沉降模式造成的连带影响。