Marine ARM GPCI Investigation of Clouds (MAGIC)
1 October 2012 - 30 September 2013
Lead Scientist: Ernie Lewis
Observatory: AMF, MAG
Clouds remain a major source of uncertainty in climate projections. In this context, subtropical marine boundary layer (MBL) clouds play a key role in cloud-climate feedbacks that are not well understood yet play a large role in biases both in seasonal coupled model forecasts and annual mean climate forecasts. In particular, current climate models do not accurately represent the transition from the stratocumulus (Sc) regime, with its high albedo and large impact on the global radiative balance of Earth, to shallow trade-wind cumulus (Cu), which play a fundamental role in global surface evaporation and also albedo. Climate models do not yet adequately parameterize the small-scale physical processes associated with turbulence, convection, and radiation in these clouds. Part of this inability results from lack of accurate data on these clouds and the conditions responsible for their properties, including aerosol properties, radiation, and atmospheric and oceanographic conditions.
In MAGIC, the Marine ARM (Atmospheric Radiation Measurement) GPCI Investigation of Clouds, the second ARM Mobile Facility (AMF2) was deployed on the Horizon Lines cargo ship Spirit traversing the route between Los Angeles, California, and Honolulu, Hawaii, for one full year, from October 2012 through September 2013. AMF2's unique capabilities were utilized to observe and characterize the properties of clouds and precipitation, aerosols, and atmospheric radiation; standard meteorological and oceanographic variables; and atmospheric structure. Additionally, two intensive observational periods were conducted in January and July 2013, during which more detailed measurements of the atmospheric structure were made.
This first marine deployment of AMF2 yielded an unparalleled and extremely rich data set that will greatly enhance the ability to understand and represent clouds and precipitation, aerosols, and radiation, and the interactions among them; the processes that determine their properties; and factors that control these processes. Deployment of AMF2 on a ship that routinely traverses this route provided an opportunity to collect a long-term data set over a vast cloud region which is of intense interest to climate modelers. Specifically, the transect lies closely along the cross section used for the GPCI, and the data collected provided constraint, validation, and support for this modeling effort, and for associated modeling efforts such as the CGILS and EUCLIPSE. The founders of ARM recognized the importance of these marine cloud regimes and the original document recommending locales for ARM sites explicitly called for sites in the eastern north Pacific or eastern north Atlantic Ocean. This deployment, at long last, met the identified requirement for ARM measurements in this region.
GPCI = GCSS Pacific Cross-section Intercomparison, a working group of GCSS
GCSS = GEWEX Cloud Systems Study
GEWEX = Global Energy and Water Cycle Experiment, a core project of the World Climate Research Programme.
|Bruce Albrecht||Pavlos Kollias||Warren Wiscombe|
|Geoffrey Bland||Stephen Schwartz||Robert Wood|
|Charles Flagg||A. Siebesma||Minghua Zhang|
|Stephen Klein||Joao Teixeira|
Johnson J, L Regayre, M Yoshioka, K Pringle, S Turnock, J Browse, D Sexton, J Rostron, N Schutgens, D Partridge, D Liu, J Allan, H Coe, A Ding, D Cohen, A Atanacio, V Vakkari, E Asmi, and K Carslaw. 2020. "Robust observational constraint of uncertain aerosol processes and emissions in a climate model and the effect on aerosol radiative forcing." Atmospheric Chemistry and Physics, 20(15), 10.5194/acp-20-9491-2020.
Zheng Y, D Rosenfeld, and Z Li. 2020. "A more general paradigm for understanding the decoupling of stratocumulus‐topped boundary layers: the importance of horizontal temperature advection." Geophysical Research Letters, 47(14), e2020GL087697, 10.1029/2020GL087697.
Zheng X, S Klein, V Ghate, S Santos, J McGibbon, P Caldwell, P Bogenschutz, W Lin, and M Cadeddu. 2020. "Assessment of Precipitating Marine Stratocumulus Clouds in the E3SMv1 Atmosphere Model: A Case Study from the ARM MAGIC Field Campaign." Monthly Weather Review, 148(8), 10.1175/MWR-D-19-0349.1.
Feng X, F Xie, C Ao, and R Anthes. 2020. "Ducting and Biases of GPS Radio Occultation Bending Angle and Refractivity in the Moist Lower Troposphere." Journal of Atmospheric and Oceanic Technology, 37(6), 10.1175/JTECH-D-19-0206.1.
Goss HB, KS Dorsey, CB Ireland, MR Wasem, RA Stafford, and R Jundt. 2020. 2019 Atmospheric Radiation Measurement (ARM) Annual Report. Ed. by Kathryn Dorsey, ARM user facility. DOE/SC-ARM-19-032.
Muradyan P and R Coulter. 2020. Micropulse Lidar (MPL) Instrument Handbook. Ed. by Robert Stafford, U.S. Department of Energy. DOE/SC-ARM/TR-019.
Muradyan P and R Coulter. 2020. Radar Wind Profiler (RWP) and Radio Acoustic Sounding System (RASS) Instrument Handbook. Ed. by Robert Stafford, U.S. Department of Energy. DOE/SC-ARM/TR-044.
Sarkar M, P Zuidema, B Albrecht, V Ghate, J Jensen, J Mohrmann, and R Wood. 2020. "Observations pertaining to precipitation within the Northeast Pacific Stratocumulus-to-Cumulus Transition." Monthly Weather Review, 148(3), 10.1175/MWR-D-19-0235.1.
Yang W, A Marshak, and G Wen. 2019. "Cloud edge properties measured by the ARM shortwave spectrometer over ocean and land." Journal of Geophysical Research: Atmospheres, 124(15), doi: 10.1029/2019JD030622.
Smalley M, K Suselj, M Lebsock, and J Teixeira. 2019. "A novel framework for evaluating and improving parameterized subtropical marine boundary layer cloudiness." Monthly Weather Review, 147(9), 10.1175/MWR-D-18-0394.1.
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Campaign Data Sets
|IOP Participant||Data Source Name||Final Data|
|Mary Jane Bartholomew||Parcivel Disdrometer||Order Data|
|J.-Y. Christine Chiu||CIMEL Sunphotometer||Order Data|
|Paul DeMott||Ice Spectrometer||Order Data|
|Ernie Lewis||Ship Leg Summaries||Order Data|
|Patrick McBride||Solar Spectral Flux Radimeter||Order Data|
|Patrick Minnis||VISST: Cloud Properties derived from Geostationary Satellite Data||Order Data|
|R. Reynolds||Air Temperature Measurements (Psychrometer)||Order Data|
|R. Reynolds||Atmospheric Optical Depth||Order Data|
|R. Reynolds||Best Estimate 1-min Downwelling Radiation Data||Order Data|
|R. Reynolds||Best Estimate 1-min Meteorology Data||Order Data|
|R. Reynolds||Best Estimate 1-min Sea Surface Temperature Data||Order Data|
|R. Reynolds||Bridge Display (Wind)||Order Data|
|R. Reynolds||Bulk Aerodynamic Fluxes||Order Data|
|R. Reynolds||Infrared Seasurface Skin Temperature Autonomous Radiometer||Order Data|
|R. Reynolds||RH Quality Assurance (Psychrometer)||Order Data|
|R. Reynolds||Raw Navigation/GPS Data||Order Data|
|R. Reynolds||Ship Leg Reports||Order Data|
|R. Reynolds||Sunshine Pyranometer||Order Data|
|Gunnar Senum||Mentor Processed Cloud Condensation Nuclei Counter||Order Data|
|Gunnar Senum||Mentor Processed Humidigraph||Order Data|
|Gunnar Senum||Mentor Processed Hydroscopic Tandem Diffentential Mobility Analyser||Order Data|
|Gunnar Senum||Mentor Processed Nephelometer||Order Data|
|Gunnar Senum||Ultra High Sensitivity Aerosol Spectrometer||Order Data|
|Stephen Springston||Mentor Processed Meteorological Data||Order Data|
|Stephen Springston||Mentor Processed Particle Soot Absorption Photometer||Order Data|
|Richard Wagener||European Centre for Medium Range Weather Forecasting||Order Data|
MAG Data Sources
|Name||Full Name||Browse Data|
||Aerosol Observing System||Browse Data|
||Meteorological Measurements associated with the Aerosol Observing System||Browse Data|
||Atmospheric Sounder Spectrometer for Infrared Spectral Technology||Browse Data|
||Cloud Condensation Nuclei Particle Counter||Browse Data|
||Boundary-layer height data with CEIL||Browse Data|
||Condensation Particle Counter||Browse Data|
||High Spectral Resolution Lidar||Browse Data|
||Humidified Tandem Differential Mobility Analyzer||Browse Data|
||Infrared Thermometer||Browse Data|
||Ka ARM Zenith Radar||Browse Data|
||KAZR Ship Motion Correction||Browse Data|
||Marine Surface Meteorological Instrumentation||Browse Data|
||Micropulse Lidar||Browse Data|
||Cloud mask from Micropulse Lidar||Browse Data|
||MPL Corrected for Ship Motion||Browse Data|
||Marine W-Band (95 GHz) ARM Cloud Radar||Browse Data|
||MWACR Ship Motion Correction||Browse Data|
||Microwave Radiometer||Browse Data|
||Microwave Radiometer, 3 Channel||Browse Data|
||MWR Retrievals||Browse Data|
||Navigational Location and Attitude||Browse Data|
||Navigational Location and Attitude Best Estimate||Browse Data|
||Ozone Monitor||Browse Data|
||Planetary Boundary Layer Height||Browse Data|
||Portable Radiation Package||Browse Data|
||Particle Soot Absorption Photometer||Browse Data|
||Radar Wind Profiler||Browse Data|
||Shortwave Array Spectroradiometer-Zenith||Browse Data|
||Balloon-Borne Sounding System||Browse Data|
||Stabilized Platform||Browse Data|
||Total Sky Imager||Browse Data|
||Ultra-High Sensitivity Aerosol Spectrometer||Browse Data|