Tuesday June 258:00am Talks, nominally 15 minutes, with time for questions and discussion.

Jim Moum / BAMS outlineAurélie Moulin / diurnal warm layerBill SmythAlan Brewer

9:30 coffee

Aurélie Moulin / physics of freshwater poolsLiz Thompson / precipitation radar perspectives on air sea interactionsSteve RutledgeSimon de SzoekeEric Skyllingstad / cold pool/convective system modeling

12:00 lunch

Chris ZappaJune MarionChris FairallJim Edson

2:30pm Discussion

How are we going to complete BAMS paper?Identify and prioritize scientific issues for discussion WednesdayData availableOutstanding tasks for individuals and collaborationsSet Wednesday schedule

4:00 adjourn

6:00 BBQ at Jim Moum’s house Wednesday June 268:00am Small working groups meet to resolve specific issues, organize papers, etc. 2:00pm Progress reports to whole group; plan Thursday agenda 4:00pm Relaxing excursion to Marys Peak or Chip Ross Park Thursday June 278:00am Progress reports to whole group?12:00 adjourn

AIR-SEA INTERACTIONS FROM WESTERLY WIND BURSTS DURING THE NOVEMBER 2011 MJO IN THE INDIAN OCEAN James N. Moum, Simon P. de Szoeke, William, D. Smyth, James B. Edson, H. Langley DeWitt, Aurelie J. Moulin, Elizabeth J. Thompson, Christopher J. Zappa, Stephen A. Rutledge, Richard H. Johnson and Christopher W. Fairall Abstract The Madden-Julian Oscillation (MJO) is identified with convectively-active events that intensify over the Indian Ocean, appearing as pulses of low outgoing long-wave radiation (OLR), caused by low radiance temperature from high clouds. During November 2011, the second month of the DYNAMO (DYNAmics of the MjO) experiment, we observed a full spectrum of intense multiscale interactions within an MJO convective envelope, including synoptic, convective mesoscale, and turbulent scale variations in both the atmosphere and ocean. A developing tropical cyclone and a strong MJO event coincided near 0°N, 80°E, the site of the Research Vessel Roger Revelle. Embedded within the MJO event, two energetic bursts of sustained eastward wind (>10 m s -1, 0-8 km height) and enhanced precipitation passed over the ship, each propagating eastward at roughly the Kelvin wave speed. Intermittent rain observed at the ship before the wind bursts became more widespread, stratiform , and long-lived during the wind bursts. While shallow atmospheric cold pool fronts modestly increased the wind for tens of minutes to hours in the vicinity of rain showers, the bursts increased the wind stress by 0.2 N m–2 for two days (with peak stresses above 0.7 N m–2 during the first wind burst, possibly enhanced by the tropical disturbance). The ocean response was rapid, energetic, and complex, accelerating the Yoshida-Wyrtki Jet at the equator from less than 0.5 m s -1 to more than 1.5 m s-1 over a 2-day period and doubling eastward transport along the ocean’s equatorial waveguide. Subsurface turbulent heat fluxes were comparable to the surface heat flux, thus playing a comparable role in cooling sea surface temperature (SST). The sustained eastward surface jet continued to energize shear-driven entrainment at its base after the MJO wind bursts, thereby further modifying SST for a period of several weeks after the MJO had passed. AFFILIATIONS: MOUM, DESZOEKE, SMYTH, MOULIN – College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis , OR; EDSON – Department of Marine Sciences, University of Connecticut, Groton, CT; DEWITT – NOAA Pacific Marine Environmental Laboratory, Seattle, WA; THOMPSON, RUTLEDGE, JOHNSON – Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO; ZAPPA - Ocean and Climate Physics Division, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY; FAIRALL – NOAA Earth System Research Laboratory, Boulder, CO CORRESPONDING AUTHOR: James N. Moum, College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5503e-mail: moum@coas.oregonstate.edu tropical convection jargon

in honor of Thanksgiving dinner 2011

start of the active phase of MJO2