Tarmachan Automatic Weather Station (National Trust for Scotland/University of Dundee)

Mountain weather station on the south-facing slopes of Meall nan Tarmachan on the National Trust for Scotland's National Nature Reserve (NNR). The site is at 710 m above sea level, overlooking Loch Tay. Snowcover has historically been an important part of the climate of the site, but in recent years has become increasingly transient. The NNR is the most important in Scotland for its arctic alpine flora, we are noticing changes in species distribution and to habitats indicative of the effects of climate change. Hence the establishment of this weather station to allow changes in climate at altitude to be monitored. This site installed May 2018 ~20 m beyond the headwall of a disused quarry. Winds may cause undercatch of rainfall (though the gauge is of an aerodynamic design) and more particularly snow. Recorded wind speeds may underestimate winds generally around the mountain owing to effects of the quarry wall. An earlier site was operated nearby in the early 2000s but sadly data have been lost. Data are recorded on a Campbell Scientific CR1000 data logger, running with 10 s scan rate and 15 min logging interval. Snow depths may be inferred by examining TCDT (temperature-corrected depth to target) data - obtained from a SR50A sensor on an arm c. 2.3 m above ground. These are available only for limited periods in 2019 and again winter 2021/22, and are now discontinued. However, snow cover can be inferred by examining the differential between air temperature and ground temperature: the ground sensor is insulated when snow covers the ground. Sensor details: see metdata Real-time data are displayed graphically at https://hydro-data.dundee.ac.uk/tarmachan (no downloads)该气象站设于苏格兰国民信托（National Trust for Scotland）管理的国家自然保护区（National Nature Reserve, NNR）内梅勒南塔马坎（Meall nan Tarmachan）的南坡，海拔710米，俯瞰泰湖（Loch Tay）。降雪曾是该区域气候的重要组成部分，但近年来其持续时长愈发短暂。 该国家自然保护区拥有苏格兰最为重要的北极高山植物区系，我们已观测到物种分布与栖息地的变化，这些变化均为气候变化影响的表征。为此，我们设立该气象站以监测高海拔区域的气候变迁。该站点于2018年5月布设，位于一处废弃采石场的壁顶后方约20米处。受采石场岩壁的影响，记录的风速可能低于山地整体风速水平；同时，尽管雨量筒采用气动设计，风力仍可能导致降雨（尤其是降雪）的捕获量不足。 2000年代初期，附近曾运行过一处早期站点，但遗憾的是相关数据已丢失。 数据由Campbell Scientific CR1000数据记录仪采集，扫描频率为10秒，记录间隔为15分钟。 雪深可通过分析TCDT（温度校正目标深度，temperature-corrected depth to target）数据推算——该数据由安装在距地面约2.3米悬臂上的SR50A传感器获取。此类数据仅在2019年的部分时段及2021/2022年冬季可用，现已停止采集。不过，可通过分析气温与地温的差值推断积雪覆盖情况：当地面被积雪覆盖时，地温传感器会处于隔热状态。 传感器详细信息请参阅元数据（metdata）。 实时数据以图形化形式展示于https://hydro-data.dundee.ac.uk/tarmachan（不支持下载）。