A distributed atmosphere - sea ice - ocean observatory in the central Arctic Ocean: concept and first results

• Main Authors: Hoppmann, Mario, Nicolaus, Marcel, Rabe, Benjamin, Wenzhöfer, Frank, Katlein, Christian, Scholz, Daniel
• Format: Conference Object
• Language: unknown
• Published: 2017
• Subjects: Arctic; Arctic Ocean; Sea ice
• Online Access: https://epic.awi.de/id/eprint/44434/; https://epic.awi.de/id/eprint/44434/1/Hoppmann_MOSAiC2017_FRAMbuoys_poster_small.pdf; https://hdl.handle.net/10013/epic.50759; https://hdl.handle.net/10013/epic.50759.d001

To understand the current evolution of the Arctic Ocean towards a less extensive, thinner and younger sea ice cover is one of the biggest challenges in climate research. Especially the lack of simultaneous in-situ observations of sea ice, ocean and atmospheric properties leads to significant knowledge gaps in their complex interactions, and how the associated processes impact the polar marine ecosystem. Here we present a concept for the implementation of a long-term strategy to monitor the most essential climate- and ecosystem parameters in the central Arctic Ocean, year round and synchronously. The basis of this strategy is the development and enhancement of a number of innovative autonomous observational platforms, such as rugged weather stations, ice mass balance buoys, ice-tethered bio-optical buoys and upper ocean profilers. The deployment of those complementing platforms in a distributed network enables the simultaneous collection of physical and biogeochemical in-situ data on basin scales and year round, including the largely undersampled winter periods. A key advantage over other observatory systems is that the data is sent via satellite in near-real time, contributing to numerical weather predictions through the Global Telecommunication Network (GTS) and to the International Arctic Buoy Programme (IABP). The first instruments were installed on ice floes in the Eurasian Basin in spring 2015 and 2016, yielding exceptional records of essential climate- and ecosystem-relevant parameters in one of the most inaccessible regions of this planet. Over the next 4 years, and including the observational periods of the Year of Polar Prediction (YOPP, 2017-2019) and the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC, 2020), the distributed observatory will be continued and extended by deployments of additional instruments in the central Arctic each year, benefitting from international logistical efforts. The continuous data generated by this new autonomous drifting system is expected to provide new insights into the complex Arctic climate- and ecosystem on multiple scales. It is especially valuable in the context of the MOSAiC experiment, extending its coverage both in space and time.