Abstract. The Arctic marine climate system is changing rapidly, which is seen in the warming of the
ocean and atmosphere, decline of sea ice cover, increase in river discharge,
acidification of the ocean, and changes in marine ecosystems. Socio-economic
activities in the coastal and marine Arctic are simultaneously changing. This
calls for the establishment of a marine Arctic component of the Pan-Eurasian
Experiment (MA-PEEX). There is a need for more in situ observations on the
marine atmosphere, sea ice, and ocean, but increasing the amount of such
observations is a pronounced technological and logistical challenge. The
SMEAR (Station for Measuring Ecosystem–Atmosphere Relations) concept can be
applied in coastal and archipelago stations, but in the Arctic Ocean it will
probably be more cost-effective to further develop a strongly distributed
marine observation network based on autonomous buoys, moorings, autonomous
underwater vehicles (AUVs), and unmanned aerial vehicles (UAVs). These have to
be supported by research vessel and aircraft campaigns, as well as various
coastal observations, including community-based ones. Major manned drifting
stations may occasionally be comparable to terrestrial SMEAR flagship
stations. To best utilize the observations, atmosphere–ocean reanalyses need
to be further developed. To well integrate MA-PEEX with the existing
terrestrial–atmospheric PEEX, focus is needed on the river discharge and
associated fluxes, coastal processes, and atmospheric transports in
and out of the marine Arctic. More observations and research are also needed
on the specific socio-economic challenges and opportunities in the marine and
coastal Arctic, and on their interaction with changes in the climate and
environmental system. MA-PEEX will promote international collaboration;
sustainable marine meteorological, sea ice, and oceanographic observations;
advanced data management; and multidisciplinary research on the marine Arctic
and its interaction with the Eurasian continent.