Stream Temperature - Placid Woods (PDWD) Water year 2004-2005

Stream Temperature: Site: Placid Woods (PDWD): In the Baltimore urban long-term ecological research (LTER) project, (Baltimore Ecosystem Study, BES) we use the watershed approach to evaluate integrated ecosystem function. The LTER research is centered on the Gwynns Falls watershed, a 17,150 ha catchment that traverses a gradient from the urban core of Baltimore, through older urban residential (1900 - 1950) and suburban (1950- 1980) zones, rapidly suburbanizing areas and a rural/suburban fringe. Stream temperature is continuously measured throughout the Gwynns Falls watershed along with supplemental sites around Baltimore County/City. A total of 22 sites contain sensors (HOBO Pro v2 Water Temperature Data Logger - U22-001) that take an instantaneous temperature reading every 2 minutes. These data are downloaded on a monthly basis. This dataset is for Placid Woods, a stream in Carney, MD that is part of the Jennifer Branch stream network. This was too small to delineate using USGS StreamStats. Purpose: Long-term monitoring of stream temperature in a suburban watershed. Theme keywords: stream, watershed, temperature, suburban, Baltimore Ecosystem Study Review process for BES stream temperature data: Raw data were recorded and logged every 2-minutes using HOBO Pro v2 Water Temperature Data Logger - U22-001. Data are exported into Microsoft Excel documents. Then organized by site and by month Each month's data were entered into a pivot table in Microsoft Excel and daily means and counts of daily data points were calculated. Plots were graphed of sites with close geographic proximity on the same graph to illustrate possible outlier data. Missing and odd data were flagged, and notes taken from the field visits are provided where applicable.溪流温度：普拉西德伍兹（PDWD）站点 本数据集隶属于巴尔的摩城市长期生态研究（Long-Term Ecological Research，LTER）计划，即巴尔的摩生态研究（Baltimore Ecosystem Study，BES），采用流域研究方法评估生态系统整体功能。本次LTER研究以格温斯福尔斯流域为核心，该流域面积达17150公顷，覆盖从巴尔的摩城市核心区、1900-1950年建成的老旧城区住宅区、1950-1980年建成的郊区地带、快速郊区化区域，直至城乡交错带的完整梯度。 格温斯福尔斯流域全域及巴尔的摩县/市周边的补充站点均持续监测溪流温度。共计22个站点搭载了HOBO Pro v2型水温数据记录仪（型号U22-001），每2分钟采集一次瞬时水温数据，数据每月下载一次。 本数据集对应普拉西德伍兹溪流，该溪流位于马里兰州卡尼市，隶属于珍妮特支流水系。由于流域面积过小，无法通过美国地质调查局（United States Geological Survey，USGS）的StreamStats工具完成流域划分。 数据集用途：对郊区流域的溪流温度开展长期监测。 主题关键词：溪流、流域、水温、郊区、巴尔的摩生态研究 BES溪流温度数据审核流程：原始数据通过HOBO Pro v2型水温数据记录仪（型号U22-001）每2分钟记录并存储，随后导出至Microsoft Excel文档，按站点与月份进行分类整理。每月数据将导入Microsoft Excel数据透视表，计算每日平均水温及当日有效数据点数。将地理位置邻近的站点数据绘制于同一张图表中，以识别潜在异常值；对缺失数据与异常数据进行标记，并根据实地踏勘记录补充相关备注（如适用）。