1 / 21

Origins of MJO in central, equatorial Indian Ocean Mechanisms for initiation not well understood

Origins of MJO in central, equatorial Indian Ocean Mechanisms for initiation not well understood MJO affects: Monsoons (Onset and Intensity) TC activity in all 3 ocean basins Teleconnections to mid-latitudes Coupling to ENSO (influences onset, intensification and irregularity of ENSO)

gloria
Download Presentation

Origins of MJO in central, equatorial Indian Ocean Mechanisms for initiation not well understood

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Origins of MJO in central, equatorial Indian Ocean Mechanisms for initiation not well understood MJO affects: Monsoons (Onset and Intensity) TC activity in all 3 ocean basins Teleconnections to mid-latitudes Coupling to ENSO (influences onset, intensification and irregularity of ENSO) DYNAMO---DYNAmics of the MJO Defined phases of the MJO

  2. AMIE and CINDY/DYNAMO Sites CINDY2011/DYNAMO AMIE-Manus AMIE-Gan

  3. DYNAMO—Fall 2011 • GOAL: • Improve the understanding of MJO initiation processes • OBJECTIVES: • Collect observations in the equatorial Indian Ocean needed to understand MJO initiation • Identify critical deficiencies in numerical models responsible for the low prediction skill of MJO initiation • Provide observations that will assist in the improvement of model parameterizations • Provide information that will enhance MJO monitoring and climate predictions on intraseasonal timescales

  4. Radar array in relation to DYNAMO Hypotheses • Deep convection can be organized into an MJO convective envelope only when the moist layer has become sufficiently deep over a region of the MJO scale • Specificconvective populations at different stages are essential to MJO initiation • The barrier layer, wind- and shear-driven mixing, shallow thermocline, and mixing-layer entrainment all play essential roles in MJO initiation in the Indian Ocean

  5. Sounding/Radar Array Dick Johnson and Paul Ciesielski leading radiosonde program

  6. DYNAMO observing network and TRMM 3B43 Oct-Dec precipitation climatology Gan Ship radar 1 Ship radar 2 Diego Garcia

  7. Radar array RV Revelle and RV Mirai: • Scanning C-band and vertically-pointing W-band radars Gan “Supersite”: • DOE AMF2 radars: Could include scanning polarimetric X- and Ka-band radars and a vertically pointing W- or Ka-band radar • Texas A&M SMART-Radar: Scanning C-band • NCAR S-Polka radar: Scanning, polarized, dual wavelength (Ka- and S-band)

  8. Strengths of individual radars AMF2 • Vertically pointing W-band Doppler radars (also in ships): • Non-precip & precip clouds • Light rain • Radiative heating • X- and Ka-band polarimetric Doppler radars: • Air motions in clouds • Liquid water SMART-R and ships • C-band Doppler radars: • Convective and stratiform precipitation • Mesoscale air motions S-PolKa • S- and Ka-band polarimetric Doppler radar: • Hydrometeor type • Non- precip & precip clouds • Air motions • Humidity profile in relation to clouds • Boundary layer

  9. Habitat islands (linked by road) Gan island Geographic setting Addu Atoll

  10. Installation sites suggested by survey team Spit SPolKa AMF2 Addu Atoll

  11. Atmospheric Observations from the R/V Roger Revelle

  12. Atmospheric Observations from the Revelle TOGA C-band Doppler Radar NOAA HSRL Doppler Lidar NOAA W-band radar NCAR ISS Aerosol measurements Air-sea fluxes

  13. Who is involved… • Brewer/Wolfe/Fairall • W-band radar, high resolution lidar • Rutledge • C-band scanning Doppler radar • Johnson/Brown (NCAR) • Ship Integrated Sounding System, 915 MHz profiler and radiosonde • Bates • Aerosol, CCN measurements

  14. NASA-TOGA radar • Used successfully in TOGA COARE and elsewhere • 5 cm Doppler radar, single polarization • State of the art signal processor upgrade done • NASA/Wallops personnel and Bob Bowie from CHILL traveling to Darwin now for radar installation next week

  15. Objectives for TOGA based research • Document 3-D structure of precipitating clouds over the course of MJO initiation and link to moisture field • Characterize convective and mesoscale structure, and degree of convective organization and link to environmental shear • Estimate divergence profiles from VAD scans to diagnose heating profiles and the nature of these profiles as the MJO evolves • Document the 2-D flow structure in organized convective systems and compare to conceptual models for momentum transport • Produce high quality rain maps based on TOGA reflectivity data (S-polKa polarimetric data will help develop appropriate Z-R relationships)

  16. TOGA COARE observations of mesoscale organization and rainfall contributions Rickenbach and Rutledge (1998) Pre-MJO and at leading portion of MJO Light wind and post MJO westerly phase

  17. R/V Revelle Built: 1996 Length: 277’ Beam: 52'5” Draft (max): 17’ Crew: 22 Scientific berthing: 37 http://shipsked.ucsd.edu/Ships/Roger_Revelle/

  18. ESRL (Lidar) Revelle O2 deck Placement w/ PMEL Frames Tip cal ESRL (W-Band) TOGA Radar

  19. Example of similar installation on the R/V Ronald Brown

  20. IOP SOP Project Timeline 1-OCT 1- NOV 1-DEC 1-JAN 1-FEB 1-MAR 1-APR EOP AMF2, SMART-R, Darwin, Manus S-PolKa, RV Revelle, RV Sagar-Kenya and RV Southern Surveyor (plus EOP observations) RV Mirai (plus IOP observations)

  21. Cruise 1, 29 August to 26 September, Darwin to Phuket Thailand • Cruise 2, Sept 29 to 31 Oct. Port: TBD soon • Cruise 3, Nov 5 to 10 December. Port: TBD soon • Cruise 4, Dec 13 to 5 Jan. Port: TBD soon • Cruise 5, 11 Jan to 16 Feb, ending at Capetwon where the radar will be removed. CSU-CHILL Update

More Related