@article {5819, title = {{Large and local-scale influences on physical and chemical characteristics of coastal waters of Western Europe during winter}}, journal = {Journal of Marine Systems}, volume = {139}, year = {2014}, pages = {79{\textendash}90}, abstract = {

There is now a strong scientific consensus that coastal marine systems of Western Europe are highly sensitive to the combined effects of natural climate variability and anthropogenic climate change. However, it still remains challenging to assess the spatial and temporal scales at which climate influence operates. While large-scale hydro-climatic indices, such as the North Atlantic Oscillation (NAO) or the East Atlantic Pattern (EAP) and the weather regimes such as the Atlantic Ridge (AR), are known to be relevant predictors of physical processes, changes in coastal waters can also be related to local hydro-meteorological and geochemical forcing. Here, we study the temporal variability of physical and chemical characteristics of coastal waters located at about 48{\textdegree}N over the period 1998-2013 using (1) sea surface temperature, (2) sea surface salinity and (3) nutrient concentration observations for two coastal sites located at the outlet of the Bay of Brest and off Roscoff, (4) river discharges of the major tributaries close to these two sites and (5) regional and local precipitation data over the region of interest. Focusing on the winter months, we characterize the physical and chemical variability of these coastal waters and document changes in both precipitation and river runoffs. Our study reveals that variability in coastal waters is connected to the large-scale North Atlantic atmospheric circulation but is also partly explained by local river influences. Indeed, while the NAO is strongly related to changes in sea surface temperature at the Brest and Roscoff sites, the EAP and the AR have a major influence on precipitations, which in turn modulate river discharges that impact sea surface salinity at the scale of the two coastal stations. {\textcopyright} 2014 Elsevier B.V.

}, keywords = {Climate variability, Coastal systems, Large-scale hydro-climatic indices, River inputs, Time-series, Weather regimes}, issn = {09247963}, author = {Paul Tr{\'e}guer and Goberville, Eric and Barrier, Nicolas and St{\'e}phane L{\textquoteright}Helguen and Morin, Pascal and Bozec, Yann and Rimmelin-Maury, Peggy and Czamanski, Marie and Emilie Grossteffan and Cariou, Thierry and R{\'e}p{\'e}caud, Michel and Qu{\'e}m{\'e}ner, Loic} } @article {5820, title = {{Synchronous response of marine plankton ecosystems to climate in the Northeast Atlantic and the North Sea}}, journal = {Journal of Marine Systems}, volume = {129}, year = {2014}, pages = {189{\textendash}202}, abstract = {

Over the last few decades, global warming has accelerated both the rate and magnitude of changes observed in many functional units of the Earth System. In this context, plankton are sentinel organisms because they are sensitive to subtle levels of changes in temperature and might help in identifying the current effects of climate change on pelagic ecosystems. In this paper, we performed a comparative approach in two regions of the North Atlantic (i.e. the Northeast Atlantic and the North Sea) to explore the relationships between changes in marine plankton, the regional physico-chemical environment and large-scale hydro-climatic forcing using four key indices: the North Atlantic Oscillation (NAO), the Atlantic Multidecadal Oscillation (AMO), the East Atlantic (EA) pattern and Northern Hemisphere Temperature (NHT) anomalies. Our analyses suggest that long-term changes in the states of the two ecosystems were synchronous and correlated to the same large-scale hydro-climatic variables: NHT anomalies, the AMO and to a lesser extent the EA pattern. No significant correlation was found between long-term ecosystem modifications and the state of the NAO. Our results suggest that the effect of climate on these ecosystems has mainly occurred in both regions through the modulation of the thermal regime. {\textcopyright} 2013 Elsevier B.V.

}, keywords = {Climate Change, Large-scale hydro-climatic indices, Long-term changes, North Atlantic, Phytoplankton, Zooplankton}, author = {Goberville, Eric and Gr{\'e}gory Beaugrand and Martin Edwards} }