DOI: 10.5285/da84490d169246d381f59bccdfd143f1
title: Arctic Cloud Summer Expedition (ACSE): composite ship motion data for Icebreaker Oden from on board ship navigation data and University of Leeds' XSens motion sensor package.

description: This dataset contains combined measurements of platform motion and final velocity and attitude corrections for turbulence measurements on the foremast of Icebreaker Oden utilising data from the ship's navigation unit alongside data from the University of Leeds' XSens motion and heading sensory package. These data include ship speed over group, course, heading etc, for Icebreaker Oden durning Arctic Cloud Summer Expedition (ACSE). ACSE took place in the Arctic during summer 2014. These measurements were used to complement a suite of other observations taken during the cruise. Those of the UK contribution, as well as selected other data, are available within the associated data collection in the Centre for Environmental Data Analysis (CEDA) archives. Other cruise data may be available in the NOAA ACSE and The Bolin Centre for Climate Research SWERUS (SWEdish-Russian-US) holdings - see online resources linked to this record.

The XSens motion pack was mounted at the base of the sonic anemometer, in the same reference frame (rotated 30 deg to port from bow). Rotation angles given in the dataset are with respect to the earth frame, with x-axis positive to east. 

Corrections combine high rate data from the Xsens package with low rate data from the ship navigation system (heading and speed) to derive the full earth-relative platform motion at 20Hz. The motion calculation follows Edson et al. (1988) and Prytherch et al. (2015) - see linked documentation.

These data are provided as supportive data for use with the other datasets within this collection, helping to account for ship movement during the expedition for later data analysis. These data were prepared for archiving as NetCDF data at the Centre for Environmental Data Analysis (CEDA) by Ian Brooks, University of Leeds.

The Arctic Cloud Summer Expedition (ACSE) was a collaboration between the University of Leeds, the University of Stockholm, and NOAA-CIRES. ACSE aimed to study the response of Arctic boundary layer cloud to changes in surface conditions in the Arctic Ocean as a working package of the larger Swedish-Russian-US Investigation of Climate, Cryosphere and Carbon interaction (SWERUS-C3) Expedition in Summer 2014. This expedition was a core component to the overall SWERUS-C3 programme and was supported by the Swedish Polar Research Secretariat.

ACSE took place during a 3-month cruise of the Swedish Icebreaker Oden from Tromso, Norway to Barrow, Alaska and back over the summer of 2014. During this cruise ACSE scientists measured surface turbulent exchange, boundary layer structure, and cloud properties. Many of the measurements used remote sensing approaches - radar, lidar, and microwave radiometers - to retrieve vertical profiles of the dynamic and microphysical properties of the lower atmosphere and cloud.

The UK participation of ACSE was funded by the Natural Environment Research Council (NERC, grant: NE/K011820/1) and involved instrumentation from the Atmospheric Measurement Facility of the UK's National Centre for Atmospheric Science (NCAS AMF). This dataset collection contains data mainy from the UK contribution with some additional data from other institutes also archived to complement the suite of meteorological measurements.