LBA-ECO CD-03 Flux-Meteorological Data, km 77 Pasture Site, Para, Brazil: 2000-2005

Eddy correlation and micrometeorological measurements began in 2001 and continued through 2005 at the pasture site at km 77 on BR-163 just south of the city of Santarem, Para, Brazil. Measurements included turbulent fluxes (momentum, heat, water vapor, and CO2) using the eddy covariance (EC) approach. Other measurements included the CO2 profile, air temperature, humidity, wind speed profile, downward and upward solar and terrestrial radiation, downward and upward photosynthetically active radiation (PAR), atmospheric pressure, rainfall, soil temperature, soil moisture, and soil heat flux. Data are presented in 5 comma-separated ASCII value (csv) files each corresponding roughly to one calendar year.

At the beginning of the measurements, in September 2000, the field was a pasture. In November 2001, the pasture was burned, plowed, and planted in upland (non-irrigated) rice. Land use practices during the study period were recorded and are included in a table in Section 5 of this guide.

The EC system was composed of a 3D sonic anemometer (ATI 3D) and an infrared analyzer (LICOR 6262) installed on a 20m tower in the agricultural field. The methodology to calculate the flux is described in detail in Sakai et al. (2004) and a companion file is included that describes in detail the formulae used to calculate the eddy flux variables (CD03_Pasture_Flux_Calculations.pdf).

自2001年起，于巴西帕拉州桑坦雷姆市以南的BR-163公路77公里处的牧草地开展了涡度相关法与微气象学的测量工作，该工作持续至2005年。测量数据包括使用涡度协方差法获取的湍流通量（动量、热量、水汽和二氧化碳）以及其他数据，如二氧化碳剖面、空气温度、湿度、风速剖面、向下和向上的太阳辐射及地球辐射、向下和向上的光合有效辐射（PAR）、大气压力、降水量、土壤温度、土壤湿度以及土壤热通量。数据以5个逗号分隔的ASCII值（csv）文件呈现，每份文件大致对应一年的数据。测量工作开始于2000年9月，当时该地块为牧草地。2001年11月，牧草地被焚烧、耕作并种植了旱地（非灌溉）水稻。研究期间的土地利用实践被记录，并包含在本指南第5节的表格中。涡度相关系统由安装在农业田地20米高塔上的三维超声风速仪（ATI 3D）和红外分析仪（LICOR 6262）组成。计算通量的方法在Sakai等人（2004）的研究中进行了详细描述，并附有详细描述计算涡度通量变量公式的配套文件（CD03_Pasture_Flux_Calculations.pdf）。