MARCUS Ship Navigation and Correction Data

 
Poster PDF

Authors

Tami Fairless — Pacific Northwest National Laboratory
Aifang Zhou — Brookhaven National Laboratory
Karen Lee Johnson — Brookhaven National Laboratory
Meng Wang — Brookhaven National Laboratory
Scott Giangrande — Brookhaven National Laboratory
Greg McFarquhar — University of Oklahoma
Adam Theisen — Argonne National Laboratory

Category

ARM field campaigns – Results from recent ARM field campaigns

Description

The second ARM Mobile Facility (AMF2) is designed to support ocean-based deployments. To date, two deployments have completed: Marine ARM GPCI Investigation of Clouds (MAGIC) (2012 – 2013) and ARM Cloud Aerosol Precipitation Experiment (ACAPEX) (2015). The latest deployment, Measurements of Aerosols, Radiation, and CloUds over the Southern Ocean (MARCUS), is currently underway. The Australian Antarctic supply vessel Aurora Australis is carrying the AMF2 as it travels between Hobart, Australia, and the Antarctic from 1 September 2017 - 1 April 2018. In order to support the data produced by the ARM ship campaigns, a suite of VAPs has been developed. This poster presents the status of the MARCUS navigation and ship correction data as well as first looks at corrected W-band (95 GHz) ARM Cloud Radar Active Remote Sensing of CLouds (WACR-ARSCL) from the deployment to date. During ship deployments, a number of AMF2 instruments collect Global Positioning System (GPS) and Inertial Navigation System (INS) measurements. The Navigation Best Estimate (NAVBE) VAP consolidates multiple sources of the data into a single, continuous data stream to be used when information is required about ship location and orientation and to provide a more complete estimate than would necessarily be available from any one instrument. At each time step, the measurement for which we have the most confidence is selected. The result is a data stream that contains ship position and attitude at 10Hz time resolution. Additionally, a 1-min data stream presents mean ship INS and GPS measurements. Complementing, and making use of the ship navigation VAP, a number of ship correction VAPs post-process data to correct the effect of ship motion (e.g., pitch, roll, heave) on measurements which are intended to be vertically pointing. The Micropulse Lidar (MPL) Ship Correction (MPLPOLFSSHIPCOR) and Ceilometer Ship Correction (CEILSHIPCOR) VAPs are intended to correct the effect of ship motion on the lidar measurements. The MWACR is installed on a stable table. Thus the MWACR Ship Correction (MWACRSHIPCOR) VAP corrects mean Doppler velocity for the heave of the ship. The MPL, CEIL, and MWACR SHIPCOR VAPs are used as input to WACR-ARSCL. Here, we get a first look at the clouds over the Southern Ocean during MARCUS.