Campaign : Year of Tropical Convection (YOTC)

2008.05.01 - 2010.04.30

Lead Scientist : Sally McFarlane

Abstract

Example of a sonde profile available from the ARM Archive The realistic representation of tropical convection in global atmospheric models is a long-standing challenge for weather and global climate models. The lack of fundamental knowledge in this area causes difficulties in modeling and predicting prominent phenomena of the tropical atmosphere such as the inter-tropical convergence zone (ITCZ), El-Nino/Southern Oscillation (ENSO), monsoons, the Madden-Julian Oscillation (MJO), tropical cyclones, and the diurnal cycle of convection. To address the challenge of tropical convection, the World Climate Research Programme (WCRP) and the WWRP/THORPEX (World Weather Research Program/The Observing System Research and Predictability Experiment) are conducting a year of coordinated observing, modeling and forecasting of organized tropical convection. This effort is intended to exploit the vast amounts of existing observations of tropical convection, the expanding computational resources and the development of new, high-resolution modeling frameworks. The objective of the Year of Tropical Convection (YOTC) is to advance the characterization, diagnosis, modeling, parameterization and prediction of multi-scale convective/dynamic interactions.

The period May 2008 – April 2010 was chosen for the YOTC as this period captured a full ENSO cycle as well as several MJO episodes. As part of YOTC, multiple national agencies are pulling together cloud, atmospheric state, precipitation, and radiation data sets for this period. ARM has three sites within the Tropical Western Pacific that were collecting data during this period: Manus, Papua New Guinea; Nauru Island; and Darwin, Australia. The ARM sites consist of a suite of ground-based instruments that measure meteorological data, cloud properties, and radiative fluxes.

The table below lists key ARM data sets and their current availability for the YOTC period. Several data sets are currently under construction and will become available for the entire YOTC period within the next several months.

Availability of ARM data sets for YOTC period (5/1/08 4/30/10)

Meteorological Data Sets
Quantity Resolution DatastreamNameQuicklook PlotsOrder Data
Radiosondeprofiles of pressure, temperature, humidity, wind speed 2/day sondewnpn Manus
Nauru
Darwin
Continuous profiles of pressure, temperature, humidity, wind speed (mergedradiosonde and model data) 60 s; 266 vertical levels mergesonde1mace Manus
Nauru
Darwin
Surface pressure, temperature, humidity, wind speed 60 s smet60s Manus
Nauru
Darwin
Column water vapor for clear-sky and non-precipitating clouds 20 s mwrret1liljclou Manus
Nauru
Darwin
Surface Radiation Data Sets
SW and LW upwelling and downwelling surface radiative fluxes 60 s qcrad1long Manus
Nauru
Darwin
Estimated clear sky SW radiative fluxes 60 s 1swfanalskyrad1long Manus
Nauru
Darwin
Aerosol Data Sets
Aerosol optical depth 20 s mfrsraod1mich Manus
Nauru
Darwin
Cloud Data Sets
Visible hemispheric sky images 30 s tsiskyimage Manus
Nauru
Darwin
tsimovie Manus
Nauru
Darwin
Hemispheric cloud fraction 30 s; daytime only tsiskycover Manus
Nauru
Darwin
15 min; daytime only 15swfanalskyrad1long Manus
Nauru
Darwin
Cloud boundaries 10 s; up to 10 layers arsclbnd1cloth Manus
Nauru
Darwin
Vertical profile of cloud radar reflectivity 10 s; 45 m arscl1cloth Manus
Nauru
Darwin
Column liquid water path; non-precipitating clouds 20 s mwrret1liljclou Manus
Nauru
Darwin
Vertical profile of liquid water content, ice water content, particle size 10 s; 45 m microbasepi Manus
Darwin
Precipitation Data Sets
Local rain rate optical rain gauge 60 s smet60s Manus
Nauru
Darwin
Local rain rate tipping bucket 60 s rain Darwin
Disdrometer rain size distributions 60 s disdrometer Darwin
C-Polradar data reflectivity, hydrometeor class, precipitation 10 min; 3D gridded cpoldar Darwin
Combined/Averaged Data Sets
Atmospheric quantities hourly mean cmbe_atm Manus
Nauru
Darwin
Cloud/Radiation hourly mean cmbe_cldrad

These data sets will be made available here in the near future. Until then, the data are available by logging in to the ARM Data Archive.

Other Contacts

Co-Investigators
Chuck Long