VCR Fowling Point Salt Marsh Flux Tower, 2019-2023

This dataset contains eddy covariance CO2 and H2O fluxes, sensible and latent heat fluxes, and meteorological measurements collected in an intertidal salt marsh. The flux tower is part of the Virginia Coastal Reserve Long Term Ecological Research (VCR LTER) site on the Eastern Shore of Virginia, USA. The marsh is on the Atlantic Ocean side of the Delmarva Peninsula and faces shallow coastal lagoons backed by barrier islands. No major rivers drain into the area. The tower is located 2 km from the shoreline and 85 m from a major creek edge. The marsh is dominated by Spartina alterniflora (also referred to as Sporobolus alterniflorus ), with an average height of 0.6 m. The semidiurnal tidal cycle inundates the marsh platform twice daily, with 10% of time points having water above the mud platform (indicated by the MHHW dataset variable). Fluxes were measured at 10Hz and averaged over 30 minutes. The CO2 and energy fluxes were gap-filled using the REddyProc software package (doi: 10.5194/bg-15-5015-2018). Using the nighttime approach, the gross primary production and ecosystem respiration fluxes were partitioned from the net ecosystem exchange flux. The research was conducted at the Virginia Coastal Reserve Long Term Ecological Research (VCR LTER) site on the Eastern Shore of Virginia, USA. The flux tower site (37-deg 24'39.85"N, 75-deg 50'0.53"W) a lagoonal salt marsh which is located near the area of Fowling point. The site is located at about 2.2 kilometers away from the mainland and 10.7 kilometers away from Hog Island, the nearest barrier island. The flux tower is situated at about 80 meters away from the creek edge, on the lagoonal salt marsh.

本数据集涵盖潮间带盐沼中采集的涡动协方差（eddy covariance）CO₂与H₂O通量、感热通量（sensible heat flux）与潜热通量（latent heat flux），以及气象观测数据。该通量塔隶属于美国弗吉尼亚东海岸的弗吉尼亚海岸保护区长期生态研究（Virginia Coastal Reserve Long Term Ecological Research, VCR LTER）站点。该盐沼位于德尔马瓦半岛（Delmarva Peninsula）大西洋一侧，毗邻以障壁岛（barrier islands）为依托的浅海潟湖，区域内无主要河流汇入。该通量塔距海岸线2公里，距主要潮沟（creek）边缘85米。该盐沼的优势植被为互花米草（Spartina alterniflora，亦称Sporobolus alterniflorus），平均株高0.6米。半日潮周期（semidiurnal tidal cycle）每日两次淹没沼滩平台，10%的时间点内水体覆盖泥滩平台（该状态由MHHW数据集变量标记）。通量以10Hz的频率采集，并以30分钟为间隔进行平均。CO₂与能量通量采用REddyProc软件包（doi: 10.5194/bg-15-5015-2018）完成间隙填充（gap-filled）。通过夜间方法，研究人员从净生态系统交换（net ecosystem exchange）通量中拆分得到总初级生产力（gross primary production）与生态系统呼吸（ecosystem respiration）通量。本研究开展于美国弗吉尼亚东海岸的弗吉尼亚海岸保护区长期生态研究（VCR LTER）站点。该通量塔站点坐标为37°24′39.85″N，75°50′0.53″W，属于潟湖型盐沼，毗邻福林角（Fowling point）区域。该站点距大陆约2.2公里，距最近的障壁岛霍格岛（Hog Island）约10.7公里。通量塔坐落于潟湖型盐沼中，距潮沟边缘约80米。