SGP97 GCIP/NESOB Surface: Sensible, Latent and Ground Heat Flux Composite

This 30 minute Sensible, Latent and Ground Heat Flux Composite is one of two surface-layer flux data sets provided in the Atmospheric Radiation Measurement(ARM)/Global Energy and Water Cycle Experiment (GEWEX) Continental-Scale International Project (GCIP) Near Surface Observation Data Set - 1997 (NESOB-97). This Sensible, Latent and Ground Heat Flux composite was formed from three data sources: the ARM Southern Great Plains (SGP) Clouds and Radiation Testbed (CART) Energy Balance/Bowen Ratio (EBBR) sites, the National Oceanic and Atmospheric Administration (NOAA)/Atmospheric Turbulence and Diffusion Division (ATDD) Little Washita Watershed site, and the ARM SGP Eddy Correlation (ECOR) sites. Data from 14 ARM/EBBR stations, 1 NOAA/ATDD station, and 8 ARM/ECOR stations were merged to form this composite. The University Corporation for Atmospheric Research/Joint Office for Science Support (UCAR/JOSS) did not do any quality control on the data set. Heat flux sensors consist of a differential temperature sensor which measures heat flow. Heat flux is a vector quantity of energy flowing through a 1 meter square surface in one second. Sensible heat flux is the transfer of sensible heat between the surface and the air, or vice versa. Latent heat flux is the transfer of latent heat (heat released or absorbed by water) between the surface and the air, or vice versa. Ground, or soil, heat flux is the transfer of sensible heat in the soil, either toward the surface or away from the surface. The Little Washita site records only 1 soil heat flux value. The EBBR sites record soil heat flux values from 5 different sensors. The ARM soil sensors are located in a half-circle approximately 2 meters in diameter under the net radiometer, which extends to the south about 1 meter from the EBBR frame. The soil conditions at the EBBR sites are varied from very sandy soil to very clay-laden soil. However, all of the sensors for one particular EBBR site are in the same soil type. Information on the soil characteristics at each of the ARM Soil Water and Temperature System (SWATS) sites (which are located nearby the ARM EBBR sites) is available as part of the ARM/GCIP NESOB-97. (These include the "Organic Carbon and Matter", "Soil Texture", "Parameters for Soil Water Retention Models", "Bulk Density", Particle Size", and "Soil Water Retention" data sets). The EBBR sites also record Bowen Ratio, home_15 and home_30 values, as well, whereas the Little Washita site does not. Since this is a composite data set, only the first 3 fields of data from the Little Washita site will have values, while the rest of the parameters on a line will always be missing. Missing values are -999.99999.
(NOAA)/Atmospheric Turbulence and Diffusion Division (ATDD) Little Washita, Oklahoma long term flux monitoring site. This composite was developed by the merging of the computed 30-minute averaged values of Net Radiation as derived by University Corporation for Atmospheric Research/Joint Office for Science Support (UCAR/JOSS) from the 20-second values provided by ARM for its SIROS and SIRS stations, and the 30-minute averaged values of Incoming/Outgoing PAR and Net Radiation as provided by NOAA/ATDD for its Little Washita station. UCAR/JOSS computed standard deviations for the averaged data when at least 15 observations were available within the 30-minute averaging interval. JOSS did not do any other quality control on the data set. The NESOB-97 Net Radiation and PAR Composite Dataset contains eight metadata parameters and nine data parameters and flags. The metadata parameters describe the date, time, network, station and location at which the data were collected. Data values are valid for the 30 minutes preceeding the time of observation. All times are UTC. The data parameters have an associated QC flag but UCAR/JOSS does not Quality Control the data at the present time. The Quality Control flag is set to "U" for "Unchecked", unless the datum is missing, in which case the flag is set to "M". Note that the SIROS stations were changed over to SIRS in August 1997. Resources in this dataset:Resource Title: GeoData catalog record. File Name: Web Page, url: https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/428b1ca5-4e93-4553-8373-29d739077c1f

此三十分钟内的明智、潜热及地表热通量综合数据集，为大气辐射测量（ARM）/全球能量与水循环实验（GEWEX）大陆尺度国际项目（GCIP）近地表观测数据集——1997年（NESOB-97）所提供的两个表面层热通量数据集之一。本明智、潜热及地表热通量综合数据集由三个数据源构成：大气辐射测量（ARM）南部大平原（SGP）云和辐射测试平台（CART）能量平衡/鲍文比（EBBR）站点、国家海洋与大气管理局（NOAA）/大气湍流与扩散处（ATDD）小瓦希塔流域站点，以及ARM SGP涡度相关（ECOR）站点。合并了14个ARM/EBBR站点、1个NOAA/ATDD站点及8个ARM/ECOR站点数据以形成该综合数据集。大气研究大学公司/科学支持联合办公室（UCAR/JOSS）未对数据集进行任何质量控制。热通量传感器由一个测量热流的差分温度传感器组成。热通量是能量以矢量形式在每秒内通过1平方米表面的量。明智热通量是地表与空气之间明智热量的传递，或反之。潜热通量是地表与空气之间潜热量（水释放或吸收的热量）的传递，或反之。地表或土壤热通量是土壤中明智热量向地表或远离地表的传递。小瓦希塔站点仅记录1个土壤热通量值。EBBR站点记录来自5个不同传感器的土壤热通量值。ARM土壤传感器位于网式辐射计下约2米直径的半圆区域内，从EBBR框架向南延伸约1米。EBBR站点的土壤条件从极细沙土壤到极黏土土壤均有不同。然而，一个特定EBBR站点的所有传感器都处于相同的土壤类型中。关于ARM土壤水与温度系统（SWATS）站点（位于ARM EBBR站点附近）的土壤特性信息作为ARM/GCIP NESOB-97的一部分提供。（包括“有机碳与物质”、“土壤质地”、“土壤水分保持模型参数”、“体积密度”、“粒径”和“土壤水分保持”数据集）。EBBR站点还记录了鲍文比、home_15和home_30值，而小瓦希塔站点则不记录。由于这是一个综合数据集，小瓦希塔站点的前三个数据字段将具有值，而其他参数行上的参数将始终为空。缺失值为-999.99999。（NOAA）/大气湍流与扩散处（ATDD）俄克拉荷马州小瓦希塔长期通量监测站点。本综合数据集是通过合并由大气研究大学公司/科学支持联合办公室（UCAR/JOSS）从ARM提供的SIROS和SIRS站点的20秒值计算得出的净辐射30分钟平均值，以及NOAA/ATDD提供的Little Washita站点的入射/出射光合有效辐射（PAR）和净辐射30分钟平均值而开发的。当30分钟平均时间间隔内至少有15个观测值可用时，UCAR/JOSS计算了平均数据的标准偏差。JOSS未对数据集进行其他质量控制。NESOB-97净辐射和PAR综合数据集包含八个元数据参数和九个数据参数及标志。元数据参数描述了数据收集的日期、时间、网络、站点和位置。数据值有效于观测时间前30分钟。所有时间均为协调世界时。数据参数与质量控制标志相关联，但UCAR/JOSS目前不对数据进行质量控制。质量控制标志设置为“U”表示“未检查”，除非数据缺失，此时标志设置为“M”。请注意，SIROS站点于1997年8月改为SIRS。本数据集中的资源包括：资源标题：GeoData目录记录。文件名：网页，网址：https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/428b1ca5-4e93-4553-8373-29d739077c1f