Marine environmental station database of Daoulas bay

located in northwestern france, the bay of brest constitutes a coastal macrotidal and semi-enclosed ecosystem (total area of 180 km2, maximum tidal amplitude of 8 m, average depth of 8 m) influenced by both freshwater inputs from rivers (to its east-side) and fast mixing exchanges with the atlantic ocean through a narrow (1.8 km of wide) and deep (40 m) channel (to its west-side). the average flushing time of the system is around 25 days. the shallowness of the bay and the water mixing induced by tidal currents prevent the ecosystem from vertical stratification and nutrient accumulation and therefore limit eutrophication. this environment is still very rich and shelters numerous species, macrobenthic communities and remarkable habitats (for instance: maerl beds, scallops and brittlestars sandy-shelly muds, flat oysters beds associated with black scallops, slipper limpet mixed sediments, zostera beds, intertidal pacific oyster population...).nevertheless, this ecosystem is also under the pressure of human activities: the north of the system shelters a population of 400 000 inhabitants whereas the south is more influenced by intensive agricultural activities. marine resources are also intensively exploited by professional fishing, shellfish aquaculture and recreational activities (diving, fishing and picking). one of the most productive area within the bay of brest is the daoulas bay – a very shallow embayment (max depth 8 m) - that receives the freshwater inputs of « the mignonne » river. this small bay harbours various aquaculture and fishing activities and also a protected marine area managed by natura 2000. to better understand physical and biological processes within this bay and their evolution under the context of global change, an observation station has been set up since 2006. at the beginning, only water temperature was measured with the help of automatic probes. nowadays, this observatory system includes a real time monitoring of the following environmental parameters: temperature, salinity, in vivo fluorescence (chlorophyll a), oxygen concentration, ph and turbidity.data are acquired with probes fixed on metallic structure at 50 cm over the sediment bottom on the foreshore in the intertidal zone. since 2006, several type of probes were used and are listed in the data: ebi 85 from global water (http://www.globalw.com) ; ds5 hydrolab from ott (http://www.ott.com) ; sp2t, stps or smatch from nke (http://www.nke-instrumentation.fr). for each of them, temperature and salinity accuracies are also available. time frequency of recording can differ from one probe to another but tends to be 15 minutes.

位于法国西北部的布列斯特湾，是一个沿海宏观潮汐和半封闭的生态系统（总面积约为180平方公里，最大潮差8米，平均水深8米），该生态系统受到来自河流的淡水输入（东侧）以及通过狭窄（宽1.8公里、深40米）的航道与大西洋进行快速混合交换（西侧）的双重影响。该系统的平均更新周期约为25天。由于湾内水域浅薄且受潮汐水流引起的混合作用，生态系统避免了垂直分层和营养物质的积累，从而限制了富营养化的发生。尽管如此，该环境仍极为丰富，庇护着众多物种、大型底栖群落以及显著的栖息地（例如：梅尔贝床、扇贝和海星沙质壳泥、平贝床与黑色扇贝相伴、鞋贝混合沉积物、海藻床、潮间带太平洋牡蛎种群等）。然而，这一生态系统也承受着人类活动的压力：系统北部居住着40万人口，而南部则更多受到密集农业活动的影响。海洋资源也因专业捕鱼、贝类养殖和休闲活动（潜水、钓鱼和采集）而遭到过度开发。布列斯特湾内最具生产力的区域之一是道乌拉斯湾——一个非常浅的水湾（最大深度8米），它接收来自“米尼翁”河的淡水输入。这个小湾内开展了各种养殖和捕鱼活动，同时也是一个由Natura 2000管理的保护区。为了更好地理解该湾内的物理和生物过程及其在全球变化背景下的演变，自2006年起设立了观测站。最初，仅利用自动探头测量水温。如今，该观测系统包括对以下环境参数的实时监控：温度、盐度、活体荧光（叶绿素a）、氧浓度、pH值和混浊度。数据通过安装在岸线潮间带沉积物底部50厘米处的金属结构上的探头采集。自2006年以来，使用了多种类型的探头，并在数据中列出：Global Water公司的Ebi 85探头（http://www.globalw.com）；Ott公司的DS5 Hydrolab探头（http://www.ott.com）；NKE公司的SP2T、STPS或SMATCH探头（http://www.nke-instrumentation.fr）。对于每一种探头，温度和盐度的精确度也是可用的。记录的时间频率因探头而异，但倾向于每15分钟记录一次。