Search Results

You are looking at 1 - 10 of 34 items for :

  • Southern Ocean x
  • DYNAMO/CINDY/AMIE/LASP: Processes, Dynamics, and Prediction of MJO Initiation x
  • All content x
Clear All
Jean-Philippe Duvel

–2012. We consider only TDs initiated inside a large southern Indian Ocean domain (SIO; 0°–30°S, 50°–110°E). The region is limited to the west at 50°E in order to avoid Madagascar and Mozambique channel regions that certainly have particular initiation processes related to orography and to the African continent. There are around 700 TDs, as defined in the previous section, and 240 TSs according to IBTrACS initiated in this SIO domain. Thus, there are around 35% of the TDs (the cyclogenetic TD) that

Full access
Denny P. Alappattu and Qing Wang

Dynamics of MJO (DYNAMO; October 2011–March 2012) conducted over the central tropical Indian Ocean ( Yoneyama et al. 2013 ). During DYNAMO, 114 AXCTDs and 321 AXBTs were deployed in 12 research flights between 11 November and 13 December 2011 using NOAA’s WP-3D Orion aircraft (P-3) in the southern tropical Indian Ocean. The 12 flights of the P-3 during DYNAMO were made in three phases of the MJO event over the southern tropical Indian Ocean in November 2011. The purposes of this research note are to

Full access
Richard H. Johnson, Paul E. Ciesielski, James H. Ruppert Jr., and Masaki Katsumata

DYNAMO sounding data have been used to determine the apparent heat source Q 1 and apparent moisture sink Q 2 for the northern and southern sounding arrays (NSA and SSA, respectively) over the central Indian Ocean during the DYNAMO special observing period (SOP; October–November 2011). The sounding data have undergone extensive quality control prior to the computation of the budgets ( Ciesielski et al. 2014a ). In addition, a procedure has been applied to mitigate the effects of the mountainous

Full access
Douglas C. Stolz, Steven A. Rutledge, Weixin Xu, and Jeffrey R. Pierce

observed over the CIO have been linked to transport from southern Asia and the Indian subcontinent in particular ( Krishnamurti et al. 1998 ; Bates et al. 2002 ). Previous researchers have demonstrated distinct patterns of variability in the distribution of atmospheric aerosols in association with the MJO globally, over major ocean basins, and at individual sites ( Tian et al. 2008 , 2011 ; Beegum et al. 2009 ; Reid et al. 2012 ; Guo et al. 2013 ; Langley DeWitt et al. 2013 ). Key findings from

Full access
James N. Moum, Simon P. de Szoeke, William D. Smyth, James B. Edson, H. Langley DeWitt, Aurélie J. Moulin, Elizabeth J. Thompson, Christopher J. Zappa, Steven A. Rutledge, Richard H. Johnson, and Christopher W. Fairall

from a research vessel during the Southern Ocean Gas Exchange Experiment . J. Atmos. Oceanic Technol. , 30 , 2907 – 2925 , doi:10.1175/JTECH-D-12-00181.1 . DeWitt , H. L. , D. J. Coffman , K. J. Schulz , W. A. Brewer , T. S. Bates , and P. K. Quinn , 2013 : Atmospheric aerosol properties over the equatorial Indian Ocean and the impact of the Madden-Julien oscillation . J. Geophys. Res. , 118 , 5736 – 5749 , doi:10.1002/jgrd.50419 . Fairall , C. W. , E. F. Bradley , J

Full access
Kunio Yoneyama, Chidong Zhang, and Charles N. Long

turbulence to the MJO; identical twin sites in the IO (Addu Atoll) and western Pacific (Manus Island) to sample the same MJO event at its initiation and mature stages; and an aircraft operation to sample the atmospheric and oceanic boundary layers and large-scale variability between atoll and ship sites. Fig. 1. Observation network for the field campaign. Dashed lines indicate the intensive southern/northern sounding arrays, which consists of Addu Atoll and Male, Maldives; Diego Garcia Island, Colombo

Full access
Tomoe Nasuno, Tim Li, and Kazuyoshi Kikuchi

) specific humidity, (c) zonal wind, and (d) meridional wind. Fig . 3. Time series of the 3-day running mean daily precipitation rate in TRMM 3B42v7 (black), ERA-Interim forecast (red), and the precipitation rate derived from moisture budget residual (blue) over the (a) Indian Ocean domain (10°N–10°S, 60°–90°E), (b) northern sounding array (0°–5.5°N, 73°–80°E), and (c) southern sounding array (7.5°S–0°, 73°–80°E). The solid and broken lines indicate the convective initiation date and the beginning of the

Full access
Hyodae Seo, Aneesh C. Subramanian, Arthur J. Miller, and Nicholas R. Cavanaugh

. 2013a , b ). For the study of MJO, SCOAR is configured in a circumglobal tropical channel (see Fig. 2a for the model domain), with southern and northern boundaries at 31°S and 39°N, which are well outside the typical meridional extent of MJO ( Ray et al. 2009 ). The horizontal resolutions in ROMS and WRF are 40 km with the matching grids and land–sea mask. For improved representation of the shallow diurnal thermocline, a large number of vertical levels are allotted in the upper ocean. For example

Full access
Sue Chen, Maria Flatau, Tommy G. Jensen, Toshiaki Shinoda, Jerome Schmidt, Paul May, James Cummings, Ming Liu, Paul E. Ciesielski, Christopher W. Fairall, Ren-Chieh Lien, Dariusz B. Baranowski, Nan-Hsun Chi, Simon de Szoeke, and James Edson

findings can be found in section 6 . 2. Methodology a. Observational data The core of DYNAMO sounding network consisted of six sites in the central Indian Ocean that formed the basis of two ship- and land-based sounding arrays located both north and south of the equator ( Fig. 1 ). The best data coverage during DYNAMO occurred during the special observing periods (SOP) when sites in the southern sounding array (SSA) launched eight sondes per day and the two northern sounding array (NSA) sites Malé and

Full access
Simon P. de Szoeke, James B. Edson, June R. Marion, Christopher W. Fairall, and Ludovic Bariteau

initiates downwelling waves in the equatorial thermocline that in the Pacific Ocean lead to equatorial El Niño–Southern Oscillation (ENSO) anomalies ( McPhaden et al. 1992 ). Intraseasonal cycles of SST were observed on Revelle during the months of October and November during DYNAMO. The ocean also responds thermodynamically to the surface heat flux. SST increased gradually in the beginning of October, November, and December, reaching maximum temperature at 0.1-m depth on the afternoons of 15 October

Full access