LBA-ECO CD-03 Nocturnal Meteorological Data, Forest and Pasture Sites, Para, Brazil

This data set contains measurements of nocturnal meteorological profiles collected from tethered balloon platforms during July 2001, October 2001, and November 2003. Measurements were made near the pasture/agricultural tower site at km 77 on BR-163 just south of the city of Santarem, and the near the Tapajos National Forest, km 83 tower site, Santarem, Para, Brazil. Measurements collected include air temperature, wind speed and direction, and specific humidity. The 2003 measurements also included CO2 concentrations. Sites were near enough to allow comparison between sounding profiles and tower data. There are three comma-delimited ASCII files with this data set.

Profiles were obtained from sunset until the first hours after sunrise. Each sounding provided information on temperature, humidity, horizontal wind magnitude and direction as the balloon went up and down. Typical soundings went up to 300 to 400 m. During most of the night, soundings were performed hourly. The balloon rose at a rate of 0.5 m per second in the first 100 m, and 2 m per second above it. The time between successive samplings was 10 s. Intensive periods of shallow, successive soundings were performed starting at dawn, to catch the early development of the convective boundary layer (CBL). These early morning soundings went up only to the capping inversion.

本数据集收录了2001年7月、10月及2003年11月期间，于巴西桑塔雷姆市以南BR-163公里77号处的放牧/农业塔站点及塔帕约斯国家森林公园公里83号塔站点，通过系留气球平台收集的夜间气象剖面测量数据。所收集的测量数据包括气温、风速与风向、以及比湿。2003年的测量数据还包括二氧化碳浓度。各站点位置相近，便于对探空剖面与塔数据之间的比较。数据集包含三个以逗号分隔的ASCII文本文件。剖面测量数据从日落直至日出后的数小时内获取。每次探空均提供了气球上下移动过程中温度、湿度、水平风速及其方向的详细信息。典型的探空高度可达300至400米。在夜间的大部分时间，探空测量以每小时一次的频率进行。气球在前100米以每秒0.5米的速度上升，超过100米后则以每秒2米的速度上升。连续采样之间的时间间隔为10秒。在黎明时分，进行了密集的浅层连续探空，旨在捕捉对流边界层（CBL）的早期发展。这些清晨的探空仅上升至顶层逆温层。