祁连山综合观测网：黑河流域地表过程综合观测网（阿柔超级站大孔径闪烁仪-2020）

该数据集包含了黑河流域地表过程综合观测网上游阿柔站的大孔径闪烁仪通量观测数据。上游阿柔站分别架设了BLS900和RR-RSS460型号的大孔径闪烁仪，北塔为RR-RSS460的接收端和BLS900的发射端，南塔为RR-RSS460的发射端和BLS900的接收端。观测时间为2020年1月18日至2020年12月31日。站点位于青海省祁连县阿柔乡草达坂村，下垫面是高寒草地。北塔的经纬度是100.4712E，38.0568N，南塔的经纬度是100.4572E，38.0384N，海拔高度约3033m。大孔径闪烁仪的有效高度13.0m，光径长度是2390m，采样频率是1min。
大孔径闪烁仪原始观测数据为1min，发布的数据为经过处理与质量控制后的数据，其中感热通量主要是结合自动气象站观测数据，基于莫宁-奥布霍夫相似理论通过迭代计算得到，主要的质量控制步骤包括：（1）剔除Cn2达到饱和的数据（BLS900：Cn2>7.25E-14，RR-RSS460：Cn2>7.84 E-14）；（2）剔除解调信号强度较弱的数据（BLS900：Average X Intensity<1000；RR-RSS460：Demod>-20mv）；（3）剔除降水时刻的数据；（4）剔除稳定条件下的弱湍流的数据（u*小于0.1m/s）。在迭代计算过程中，对于BLS900，选取Thiermann and Grassl(1992)的稳定度普适函数；对于RR-RSS460，选取Andreas(1988)的稳定度普适函数，详细介绍请参考Liu et al. (2011, 2013)。由于仪器调整和供电不足，大孔径闪烁仪数据由于信号和供电等问题缺失的日期为：2020.09.25-2020.10.16。
关于发布数据的几点说明：（1）上游LAS数据以BLS900为主，缺失时刻由RR-RSS460观测补充，两者都缺失则以-6999标记。（2）数据表头：Date/Time ：日期/时间（格式：yyyy/m/d h:mm），Cn2 ：空气折射指数结构参数（单位：m-2/3），H ：感热通量（单位：W/m2）。数据时间的含义，如0:30代表0:00-0:30的平均；数据以*.xlsx格式存储。
黑河流域地表过程综合观测网或站点信息请参考Liu et al. (2018)，观测数据处理请参考Liu et al. (2011)。

This dataset contains flux observation data from large aperture scintillometers (LAS) at the Arou Station in the upper reaches of the Heihe River Basin Surface Process Comprehensive Observation Network.

Two models of LAS, BLS900 and RR-RSS460, were installed at the upstream Arou Station. The north tower served as the receiving end of RR-RSS460 and the transmitting end of BLS900, while the south tower served as the transmitting end of RR-RSS460 and the receiving end of BLS900. The observation period spans from January 18, 2020 to December 31, 2020.

The station is located in Caodaban Village, Arou Township, Qilian County, Qinghai Province, with an underlying surface of alpine grassland. The coordinates of the north tower are 100.4712°E, 38.0568°N, and those of the south tower are 100.4572°E, 38.0384°N, with an altitude of approximately 3033 m. The effective height of the LAS is 13.0 m, the optical path length is 2390 m, and the sampling frequency is 1 min.

The original observation data of the LAS has a 1-minute time resolution. The released data has been processed and subjected to quality control. The sensible heat flux is mainly calculated through iterative calculations based on the Monin-Obukhov Similarity Theory, combined with observations from automatic weather stations. The main quality control steps include:
(1) Removing data with saturated Cn2 (BLS900: Cn2 > 7.25E-14; RR-RSS460: Cn2 > 7.84E-14);
(2) Removing data with weak demodulated signal strength (BLS900: Average X Intensity < 1000; RR-RSS460: Demod > -20 mv);
(3) Removing data collected during precipitation events;
(4) Removing weak turbulence data under stable conditions (u* < 0.1 m/s).

During the iterative calculation, the universal stability function proposed by Thiermann and Grassl (1992) was selected for BLS900, while the universal stability function proposed by Andreas (1988) was selected for RR-RSS460. For detailed information, please refer to Liu et al. (2011, 2013). Due to instrument adjustments and insufficient power supply, LAS data was missing due to signal and power issues from September 25, 2020 to October 16, 2020.

Notes on the released data:
(1) The upstream LAS data is mainly based on BLS900, and the missing time periods are supplemented by RR-RSS460 observations. If both are missing, the value -6999 is used as the marker.
(2) Table headers: Date/Time: Date/Time (format: yyyy/m/d h:mm), Cn2: Air refraction index structural parameter (unit: m^-2/3), H: Sensible heat flux (unit: W/m²). The meaning of the data time: for example, 0:30 represents the average of 0:00-0:30. The data is stored in *.xlsx format.

For information on the Heihe River Basin Surface Process Comprehensive Observation Network or the stations, please refer to Liu et al. (2018). For data processing of observation data, please refer to Liu et al. (2011).

搜集汇总

背景与挑战

背景概述

该数据集提供了2020年黑河流域阿柔超级站的大孔径闪烁仪观测数据，包括感热通量和空气折射指数结构参数，数据经过质量控制并标记了缺失情况，适用于高寒草地地表过程研究。