Survey, British Antarctic Survey, British Antarctic Survey, Alfred-Wegener-Institut, Alfred-Wegener-Institut, Alfred-Wegener-Institut, Alfred-Wegener-Institut (2014) Atmospheric Boundary Layer Over Coastal [...] Rothera Airstrip (Photo: Alfred-Wegener-Institut) Polar 5 at Rothera. (Photo: Alfred-Wegener-Institut) Twin-Otter (BAS) viewed from Polar 5 near Rothera. (Photo: Alfred-Wegener-Institut) View from Polar [...] Polar 5. (Photo: Alfred-Wegener-Institut) Nygard, T. , Vihma, T. , Birnbaum, G. , Hartmann, J. , Lachlan-Cope, T. , Ladkin, R. , Lüpkes, C. and Weiss, A. (2016) Validation of eight atmospheric reanalyses in

been successfully applied to North Atlantic/Arctic Ocean Sea Ice Model (NAOSIM) developed at the Alfred Wegener Institute (AWI). We are currently working to apply the systems to Finite-volumE Sea ice-Ocean [...] simulation without data assimilation, red: model simulation with data assimilation. (Graphic: Alfred-Wegener-Institut) Spatial pattern of sea ice extent in September, from 1990 to 2010 (every 5 years). [...] simulation without data assimilation, black: model simulation with data assimilation. (Graphic: Alfred-Wegener-Institut) Spatial pattern of sea ice motion in August 2006: Left panel: model simulation without

currently being carried out in the circumpolar regions of the world. ICRSS-2006 group shot (Photo: Alfred-Wegener-Institut) 10th ICRSS 2008 (Whitehorse, Yukon, Canada) The 10 th International Circumpolar Remote [...] being carried out in the circumpolar regions and elsewhere. ICRSS-2008 conference photo (Photo: Alfred-Wegener-Institut) 11th ICRSS 2010 (Cambridge, United Kingdom) The 11th International Circumpolar Remote [...] of work currently being carried out in the circumpolar regions. ICRSS-2010 group photo (Photo: Alfred-Wegener-Institut) 12th ICRSS 2012 (Levi, Finland) The theme of the 12 th CRSS symposium, May 14-18 2012

Amy Forster preparing diatom slides (Photo: Alfred-Wegener-Institut) The extraction of microfossil remains like diatom valves or chironomid head capsules requires a chemical preparation of sediment samples [...] keys. Chironomid head capsule of the genus Paralauterborniella sp. (Photo: Larisa Nazarova, Alfred-Wegener-Institut)

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shrimp from the mudflats (Photo: M. Bögner Alfred-Wegener-Institut) Not a typical mudflat dweller - researcher stuck in the mud (Photo: M. Bögner Alfred-Wegener-Institut) The brown shrimp Crangon cragnon [...] cragnon is a typical inhabitant of the mudflats. (Photo: M. Bögner Alfred-Wegener-Institut) A research traveller (Photo: M. Bögner Alfred-Wegener-Institut)

Birnbaum Dr. Thomas Krumpen Melt ponds on Multi year ice (Photo: Alfred-Wegener-Institute) Melt ponds on First-year ice (Photo: Alfred-Wegener-Institute) Instrumentation The aircraft Polar 5 was equipped with [...] respectively. Flight legs at 200 ft (61 m) (Graphic: W. Cohrs, Alfred-Wegener-Institute) Flight legs at 2000 ft (610 m) (Graphic: W. Cohrs, Alfred-Wegener-Institute)

Birnbaum Dr. Thomas Krumpen Melt ponds on Multi year ice (Photo: Alfred-Wegener-Institute) Melt ponds on First-year ice (Photo: Alfred-Wegener-Institute) Instrumentation The aircraft Polar 5 was equipped with [...] respectively. Flight legs at 200 ft (61 m) (Graphic: W. Cohrs, Alfred-Wegener-Institute) Flight legs at 2000 ft (610 m) (Graphic: W. Cohrs, Alfred-Wegener-Institute)

L2120i Cavity RingDown-Spectrometer Picarro L2120i with vaporizer (photo: Alfred Wegener Institute, Levent Vorpahl) (Photo: Alfred-Wegener-Institut, Levent Vorpahl) Picarro L2140i Cavity RingDown-Spectrometer [...] with PAL HTC-xt Autosampler and A0211 Vaporizer for H and O isotopes (in water samples). (Photo: Alfred-Wegener-Institut, Levent Vorpahl) Picarro L2130i Cavity RingDown-Spectrometer 1 Picarro L2130i Cavity [...] with A0101 Autosampler and A0211 Vaporizer for H and O isotopes (in water samples). (Photo: Alfred-Wegener-Institut, Levent Vorpahl) Polar Terrestrial Environmental Systems: <link en science geosciences

for operation. (Photo: Alfred Wegener Institut) Deployment of the DEPAS OBS. (Photo: Alfred Wegener Institut) DEPAS OBS after emerging at the sea surface. (Photo: Alfred Wegener Institut) Number of instruments [...] Technology A description of the DEPAS instruments can be found in this publication: Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung et al., 2017: DEPAS (Deutscher Geräte-Pool