CTD Data collected by FIMR since 1977

The data set comprises the CTD observations made by the FIMR on R/V Aranda
cruises since 1977 and CTD observations made by Finnish Coast Guard on P/S
Merikarhu at a fixed staton in the Gulf of Finland since 1999. Nearly all the
observations are from the Baltic Sea, mostly from the Gulf of Bothnia, the Gulf
of Finland and from the northern Baltic Proper.

Outside the Baltic Sea data set contains CTD data from cruises to the Weddell
Sea and to the Denmark Strait. The amount of CTD stations per year has varied
between 500 and 1500. The measurement interval of the present CTD sondes is
some centimetres, older sonde (used in years 1977-1985) had the interval of
some tens centimetres. The small 'hang alone' SIS sonde have been used as an
extra sonde on R/V Aranda and on a few cruises made with other vessels.

Every CTD down-cast has been stored as one file or two files which include
besides the proper CTD data (depth series per station) also the date, time and
the position information. The data from the year 1991 onwards have been
averaged in one dbar interval. The data of SBE sondes have been processed with
Sea-Bird's standard software.

Measured parameters: temperature, conductivity and pressure, from 1998 also
oxygen; Calculated parameters: salinity, density.

CTD sondes: Plessey 9040 (1977-1985), Mk-III (1986- 1997), SBE 911 plus
(1994-), SIS plus 500 (1988-), Seacat SBE19 (P/S Merikarhu 1999- ).

本数据集包含芬兰海洋研究所（FIMR）自1977年起在“阿伦达号”（R/V Aranda）科考航次中获取的温盐深测量仪（Conductivity Temperature Depth, CTD）观测数据，以及芬兰海岸警卫队自1999年起在芬兰湾固定站位由“梅里卡尔胡号”（P/S Merikarhu）采集的CTD观测数据。观测数据几乎全部源自波罗的海，其中以波的尼亚湾、芬兰湾及北波罗的海盆为主。

除波罗的海数据集外，本数据集还包含前往威德尔海与丹麦海峡的航次采集的CTD数据。年均CTD站位数量在500至1500个区间内波动。当前使用的CTD探头测量间隔约为数厘米，1977至1985年使用的老旧探头测量间隔则约为数十厘米。小型独立式SIS探头曾作为额外探头搭载于“阿伦达号”科考船及少数其他船舶的航次中。

每一次CTD下潜剖面数据均存储为单个或两个文件，文件中除包含标准CTD数据（单站位深度序列）外，还附带日期、时间及位置信息。1991年起的数据已按1分巴（dbar）间隔进行平均处理。SBE系列探头的数据均通过Sea-Bird公司的标准软件完成处理。

实测参数包括温度、电导率与压力；1998年起新增溶解氧参数。计算参数包括盐度与密度。

所用CTD探头型号如下：Plessey 9040（1977-1985年）、Mk-III型（1986-1997年）、SBE 911 Plus型（1994年至今）、SIS Plus 500型（1988年至今），以及Seacat SBE19型（搭载于“梅里卡尔胡号”，1999年至今）。