Gaseous elemental mercury measurements of boundary layer air made by a Tekran 2537 during the SIPEX II voyage of the Aurora Australis, 2012

Instrument description:
Gaseous elemental mercury (GEM) was measured at five minute intervals. GEM was collected and analysed on two parallel gold traps. While GEM was collected on one gold trap, the mercury on the other traps was simultaneously being thermally desorbed and detected by a cold vapour atomic fluorescence spectrometer. The Tekran was calibrated approximately every 24 - 48 hours using an internal Hg permeation source. The internal calibration source was checked prior to shipping the instrument to Australia using an external Hg source. The internal calibration source will be verified upon return of the instrument.

Instrument Setup:
This instrument was sampling from a weather protected inlet positioned ~3 m off the front port side of the Monkey Deck of the Aurora Australis, directly above the bridge. The 35m heated Teflon sample line end and filter is contained within the "Ned Kelly", a large (~30 cm diameter) stainless steel can which protects against rain, snow, sea spray and major impacts. This sample line ran 25m down to the Tekran instrument which was located in a the Met-Lab. Ar (99.999% purity) was fed into the MetLab via quarter inch Teflon tubing from the oxygen store on the Monkey deck.
A 2D R.M. Young (model 5305-AQ) anemometer was also deployed at the same elevation on the aft side of the sample inlet. The anemometer was oriented with zero degrees pointed directly forward of the ship. Mean Wind speed and direction were captured using Campbell Scientific CR1000 datalogger at five-minute intervals.

The files included in this dataset are the raw outputs from the Tekran 2537. They include headers, though not always at the top of the file, because headers are only written when the instrument is started or after recalibration. Also included are scanned log books containing meteorological observations, maintenance notes, and when adjustments were made to the sample line (which alters anemometer data).

仪器说明：
气态元素汞（Gaseous Elemental Mercury, GEM）以5分钟为间隔进行测定。采用两套并行金阱采集并分析气态元素汞：当一套金阱采集汞样品时，另一套金阱中的汞将同步进行热解吸，并通过冷蒸气原子荧光光谱仪完成检测。Tekran分析仪约每24-48小时通过内置汞渗透源进行一次校准；在该仪器发往澳大利亚前，已通过外置汞源对内置校准源进行核查；待仪器运回后，还将再次核验内置校准源性能。

仪器布设：
本仪器的采样进气口设于"Aurora Australis"号猴甲板（Monkey Deck）左舷前部舰桥正上方约3米处，配有气象防护装置。35米长的加热特氟龙（Teflon）采样管线末端及过滤器收纳于"Ned Kelly"大型不锈钢防护舱内，该舱直径约30厘米，可抵御雨雪、海浪飞沫及外力撞击。该采样管线沿舰体向下延伸25米，连接至位于气象实验室（Met-Lab）内的Tekran分析仪。纯度为99.999%的氩气通过1/4英寸特氟龙管线，从猴甲板的氧气储罐输送至气象实验室。
在采样进气口后侧同一高度处，同时部署了一台R.M. Young公司型号为5305-AQ的二维风速风向仪，其0度方位指向舰船正前方。风速与风向的平均值通过坎贝尔科学（Campbell Scientific）CR1000数据采集器以5分钟为间隔记录。

本数据集包含的文件为Tekran 2537分析仪的原始输出结果，这些文件带有表头信息，但表头并非始终位于文件起始位置——仅当仪器启动或重新校准后才会写入表头。此外还包含扫描版日志簿，其中记录了气象观测结果、维护记录以及采样管线调整（该调整会影响风速仪数据）的相关信息。