LBA-ECO CD-03 FLUX-METEOROLOGICAL DATA, KM 77 PASTURE SITE, PARA, BRAZIL: 2001-2005

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).

涡度相关与微气象观测于2001年启动，至2005年持续开展，观测点位位于巴西帕拉州圣塔伦市南侧BR-163公路77公里处的牧场样地。
观测内容涵盖采用涡度协方差（eddy covariance, EC）方法获取的湍流通量（动量、热量、水汽与二氧化碳）；其余观测项目还包括二氧化碳廓线、气温、空气湿度、风速廓线、上下行太阳与长波辐射、上下行光合有效辐射（photosynthetically active radiation, PAR）、大气压强、降雨量、土壤温度、土壤含水量以及土壤热通量。数据集以5个逗号分隔的ASCII值（csv）文件存储，每个文件大致对应一个自然年度。
观测启动前的2000年9月，该地块为牧场；2001年11月，牧场经焚烧、翻耕后被种植为旱地（非灌溉）水稻。研究期间的土地利用方式均已记录，并收录于本指南第5章节的表格中。
涡度协方差观测系统由安装于农田20米高塔上的三维超声风速仪（ATI 3D）与红外气体分析仪（LICOR 6262）组成。通量计算方法详见Sakai等人（2004）的研究，同时附带一份详细说明涡度通量变量计算公式的配套文件（CD03_Pasture_Flux_Calculations.pdf）。