Radiometer grid at Falkenberg and surroundings, spectral solar irradiance and cloud imagery, FESSTVaL campaign

<strong>Abstract:</strong> This data set contains observations of the down-welling short wave irradiance spectrum from a network of custom-made multi-band radiometers at the Falkenberg site from June 14 to 30, 2021. The main variable is the global horizontal irradiance, which is calibrated against a high quality sun tracker at Falkenberg. Additional data includes raw measurements, pre-calibrated spectra (with limitations, see quality), and total column water vapor from spectra. Within the two weeks, we provide (with varying temporal coverage) cloud camera images at 5 seconds interval, which is helpful for interpreting the irradiance measurements (among other things). The strength of this data set is not the absolute accuracy, but rather the spatial measurements and ability to catch variability with high resolution. Note: This entry includes the level0 radiometer data, the level1 radiometer data / spectra and, as the main product for this the descriptions given here applies, the level2 product. <strong>TableOfContents: </strong>(for level2 only) <em><strong>Irradiance:</strong></em> solar irradiance; quality <em><strong>water vapor:</strong></em> atmosphere_mass_content_of_water_vapor; quality <strong>Technical Info:</strong> dimension: 864001 x N [10 Hz sampling] 86400 x N [1 second sampling] 1440 x N [1 minute sampling]; temporalExtent_startDate: 2021-06-14 00:00:00; temporalExtent_endDate: 2021-06-30 00:00:00; temporalResolution: 0.1 [10 Hz sampling] 1 [1 second sampling] 60 [1 minute sampling]; temporalResolutionUnit: seconds; spatialResolution: none; spatialResolutionUnit: none; horizontalResolutionXdirection: none; horizontalResolutionXdirectionUnit: none; horizontalResolutionYdirection: none; horizontalResolutionYdirectionUnit: none; verticalResolution: none; verticalResolutionUnit: meters; horizontalStart: 0; horizontalStartUnit: meters; horizontalEnd: 0; horizontalEndUnit: meters; instrumentNames: FROST version 1; instrumentType: https://doi.org/10.5194/egusphere-2022-726; instrumentLocation: Falkenberg; instrumentProvider: none <strong>Methods:</strong> Measurements were taken in a small scale grid setup at Falkenberg: 20 sensors in 4 by 5 grid with a 50 meter grid spacing. Another 4 sensors were placed in all direction about 5 km away from the main grid at Falkenberg. The sampling rate is 10 Hz, with accurate GPS clock synchronisation, to catch all cloud-induced irradiance variability. Measurements were taken for 2 weeks, from June 14 to 30, 2021. For more details on the sensor itself, please see the (accepted for publication) pre-print here: https://egusphere.copernicus.org/preprints/2022/egusphere-2022-726/. <strong>Quality</strong>: Data gathering, quality, calibration (The global horizontal irradiance is calibrated against a high quality sun tracker at Falkenberg.), and performance is covered in detail in the manuscript https://doi.org/10.5194/egusphere-2022-726 and other to be publications specified later. <strong>Units: </strong>(for level2 only) <em><strong>Irradiance:</strong></em> W/m²; 1 <em><strong>water vapor:</strong></em> kg/m²; 1 <strong>geoLocations:</strong> <em><strong>BoundingBox:</strong></em> westBoundLongitude: 14.071 degrees East; eastBoundLongitude: 14.204 degrees East; southBoundLatidude: 52.1534 degrees North; northBoundLatitude: 52.1704 degrees North; geoLocationPlace: Germany, UTM zone 33U <em><strong>Location:</strong></em> 52.165 °N; 14.120 °E; between 0.4 m and 0.9 m above ground; between 53 m and 67 m above mean sea level <strong>Size:</strong> <em><strong>Level0:</strong></em> ~1.2 GB (zip archive) <em><strong>Level1:</strong></em> ~0.115 GB (zip archive, radgrid data); 23.843 GB zip-archives, cloudcam images) <em><strong>Level2:</strong></em> ~0.292 GB (4 zip-archives) <strong>Format: </strong>netCDF; cloudcam images: jpg <strong>DataSources:</strong> Single site ground-based measurements. <strong>Contact: </strong>Wouter Mol, email: wbmol (at) wur.nl <strong>Webpage:</strong> https://www.cen.uni-hamburg.de/en/icdc/data/atmosphere/samd-st-datasets/samd-st-fesstval/fval-wur-radgrid-l2-v1.html <strong>Funding</strong>: Dutch Research Council (NWO), Shedding Light On Cloud Shadows: VI.Vidi.192.068 <strong>Provenance &amp; History:</strong> This new version 2 includes updated metadata for the existing data set, and additional level 0, 1, and 2 data + cloud camera images.

<strong>摘要：</strong>本数据集包含2021年6月14日至30日期间，在Falkenberg站点通过定制多波段辐射计（multi-band radiometer）网络获取的下行短波辐照度光谱（down-welling short wave irradiance spectrum）观测数据。主要变量为全球水平辐照度（global horizontal irradiance），该变量基于Falkenberg站点的高质量太阳追踪器（sun tracker）进行校准。附加数据包括原始测量值、预校准光谱（pre-calibrated spectrum，存在局限性，详见质量部分）以及从光谱中提取的整层水汽（total column water vapor）。在这两周内，我们提供时间覆盖范围不一、间隔为5秒的云相机图像（cloud camera image），这有助于解释辐照度测量结果（及其他用途）。本数据集的优势并非绝对精度，而是空间测量能力及高分辨率捕捉变化的能力。注：本条目包含level0辐射计数据、level1辐射计数据/光谱，以及作为主要产品的level2数据（此处描述适用于该产品）。<strong>目录：</strong>（仅适用于level2）<em><strong>辐照度：</strong></em>太阳辐照度；质量 <em><strong>水汽：</strong></em>大气水汽质量含量（atmosphere_mass_content_of_water_vapor）；质量 <strong>技术信息：</strong>维度：864001 × N [10 Hz采样]、86400 × N [1秒采样]、1440 × N [1分钟采样]；时间范围起始日期：2021-06-14 00:00:00；时间范围结束日期：2021-06-30 00:00:00；时间分辨率（temporal resolution）：0.1 [10 Hz采样]、1 [1秒采样]、60 [1分钟采样]；时间分辨率单位：秒；空间分辨率：无；空间分辨率单位：无；水平分辨率X方向：无；水平分辨率X方向单位：无；水平分辨率Y方向：无；水平分辨率Y方向单位：无；垂直分辨率：无；垂直分辨率单位：米；水平起始：0；水平起始单位：米；水平结束：0；水平结束单位：米；仪器名称：FROST version 1；仪器类型：https://doi.org/10.5194/egusphere-2022-726；仪器位置：Falkenberg；仪器提供商：无 <strong>方法：</strong>测量在Falkenberg站点的小规模网格设置（small-scale grid setup）中进行：20个传感器组成4×5网格，网格间距为50米；另有4个传感器放置在Falkenberg主网格周围约5公里处的各个方向。采样率为10 Hz，通过精确GPS时钟同步（GPS clock synchronization）捕捉所有云致辐照度变化（cloud-induced irradiance variability）。测量持续两周，从2021年6月14日至30日。关于传感器本身的更多细节，请参见已接收待发表的预印本：https://egusphere.copernicus.org/preprints/2022/egusphere-2022-726/。 <strong>质量：</strong>数据采集、质量、校准（全球水平辐照度基于Falkenberg站点的高质量太阳追踪器校准）及性能的详细信息见手稿https://doi.org/10.5194/egusphere-2022-726及后续指定的其他出版物。 <strong>单位：</strong>（仅适用于level2）<em><strong>辐照度：</strong></em>瓦每平方米（W/m²）；1 <em><strong>水汽：</strong></em>千克每平方米（kg/m²）；1 <strong>地理位置：</strong><em><strong>边界框（BoundingBox）：</strong></em>西边界经度：东经14.071度；东边界经度：东经14.204度；南边界纬度：北纬52.1534度；北边界纬度：北纬52.1704度；地理位置：德国，UTM 33U区 <em><strong>具体位置：</strong></em>北纬52.165°；东经14.120°；地面以上0.4米至0.9米之间；平均海平面以上53米至67米之间 <strong>大小：</strong><em><strong>Level0：</strong></em>约1.2 GB（压缩包，zip archive） <em><strong>Level1：</strong></em>约0.115 GB（压缩包，radgrid数据）；23.843 GB压缩包（云相机图像） <em><strong>Level2：</strong></em>约0.292 GB（4个压缩包） <strong>格式：</strong>网络通用数据格式（netCDF）；云相机图像：jpg <strong>数据源：</strong>单站点地面观测。 <strong>联系方式：</strong>Wouter Mol，邮箱：wbmol (at) wur.nl <strong>网页：</strong>https://www.cen.uni-hamburg.de/en/icdc/data/atmosphere/samd-st-datasets/samd-st-fesstval/fval-wur-radgrid-l2-v1.html <strong>资助：</strong>荷兰研究理事会（NWO），项目“Shedding Light On Cloud Shadows: VI.Vidi.192.068” <strong>来源与历史：</strong>本版本2包含现有数据集的更新元数据，以及附加的level0、level1、level2数据和云相机图像。