upper ocean processes in the indian ocean associated with the madden-julian oscillation toshiaki...
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![Page 1: Upper Ocean Processes in the Indian Ocean associated with the Madden-Julian Oscillation Toshiaki Shinoda (Texas A&M Univ., Corpus Christi), Weiqing Han](https://reader037.vdocuments.us/reader037/viewer/2022103121/56649c755503460f94928d37/html5/thumbnails/1.jpg)
Upper Ocean Processes in the Indian Ocean associated with the Madden-Julian
Oscillation Toshiaki Shinoda (Texas A&M Univ., Corpus Christi), Weiqing Han (Univ. of
Colorado), Yuanlong Li (Univ. of Colorado), Chunzai Wang (NOAA/AOML)
1. Large-scale ocean variability: Satellite observations and OGCM experiments2. Impact on Indonesian Throughflow3. Diurnal cycle4. Variability of the Seychelles-Chagos thermocline ridge
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Large-scale Ocean Variability
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CINDY/DYNAMO field campaign September 2011 – March 2012
Describe large-scale upper ocean variations surrounding the intensive array based on the analysis of the satellite-derived data and OGCM experiments.
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MJO events during DYNAMO
Strong convection in the Indian Ocean associated with the MJO
Strong westerly anomalies
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Satellite-derived Data
Surface winds: Windsat Daily 3-day average 0.25x0.25 deg. Precipitation: TRMM 3B52 3-hourly 0.25x0.25 deg. Sea Surface Height (SSH): AVISO Daily 1x1 deg. Sea Surface Temperature (SST): Blended Analysis (Reynolds et al. 2007) Daily 0.25x0.25 deg. Surface current: OSCAR 5-day average 1x1 deg. Sea Surface Salinity (SSS): Aquarius weekly 1x1 deg.
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Horizontal resolution: 1/25º, 1/12º Period: 2003-2012 Surface forcing fields: NOGAPS
Global Hybrid Coordinate Ocean Model (HYCOM)
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RAMA
Windsat
NCEP
Surface winds
Shinoda et al. (2013)
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Large–scale SST variation
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Large-scale surface salinityAquarius
RAMA
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Zonal Current SSH
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Reflected Rossby wavesSSH (Satellite) SSH (HYCOM) D20 (HYCOM)
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Yoneyama et al. (2013)
Webber et al. (2010)
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Impact on Indonesian Throughflow
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Seasonal variation of the Indonesian ThroughflowObservation (Gordon et al. 2008) Modeling (Shinoda et al. 2012)
PAC Rossby waves
Wyrtki Jet
Velocity component (50 m depth: shading )and SSH(contour) along the line
Wyrtki Jet
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Yoshida Jet
Wyrtki Jet
Global HYCOM
How do strong MJO events during DYNAMO impact the Indonesian Throughflow?
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Large changes in upper ocean currents
Southward current is very weak in Jan.-Feb. in contrast to the seasonal cycle (rapid recovery of southward currents in Jan.-Feb.)
Meridional velocity at Makassar Strait
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Yoshida jet
Indonesian Throughflow
Anomalous northward currents in the Indonesian Sea in January can be traced back to the Yoshida Jet generated by the MJO
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Diurnal Cycle
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High vertical resolution (1m) in the upper 10m HYCOM is able to reproduce observed diurnal warming
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Impact of diurnal cycle on intraseasonal variability
TOGA COARE Nov. 1992-Mar. 1993
Shinoda (2005), Shinoda and Hendon (1988)
SCTR 55°–70°E, 12°–4°S CEIO (65°–95°E, 3°S–3°N)
Li et al. (2013)
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Thermocline Ridge Variability
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Impact of SCTR interannual variation
Interannual variations of SCTR (e.g., deeper thermocline during IOD)How does ocean interannual variabiliti (OIV) impacts intraseasonal SST in SCTR?Additional HYCOM experiments (NoOIV): No interannual variation of surface forcing fields.
---------- 95% significance ----------- 85% significance based on F-test
The OIV effect enhances the intraseasonal SSTs in the eastern TR region by about 0.1 C (20% of the total SST variability) (significant at 95% level) and slightly reduces them in the western TR (not significant).
Li et al. (2014)
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Amplitude of the 20-90-day SST
Enhancing effect, strong-TR years,
Shallow Z20
Reducing effect, weak-TR years,
Deep Z20
Yearly Z20 from MR and NoOIV
MR NoOIV
• A Strong TR (shallow thermocline) enhances intraseasonal SSTs, while a weak TR (deep thermocline) reduces intraseasonal SSTs.
The OIV effect varies from year to year !
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SSTt
HF
ENT
Composite analysis for strong and weak TR years
Weak-year composite Strong-year composite
SST variability, HF and ENT are greatly enlarged by a strong TR year, but only slightly reduced by a weak TR.
An asymmetry between strong and weak years
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MLD is an important cause
Weak-year composite Strong-year composite
> 10 m< 5 m
An important source of the asymmetry: the MLD changes, which is shallower than normal by at least 10m in strong TR years, but is deeper than normal by only less than 5m in weak TR years. This difference leads to the strong/weak asymmetry of ENT and HF and thus the overall enhancing effect of the OIV.
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12S-4S Mean Winter Temperature
Strong TR
Weak TR
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SummaryA variety of upper ocean processes associated with the MJO that influence SST are identified by the analysis of OGCM experiments and satellite observations. These include:
Equatorial jetDiurnal cycleVariation of theromocline ridgeRemote ocean variability
Further analyses are needed to understand how SST changes caused by these upper ocean processes feedback on the atmosphere.
References:Li, Y., W. Han, T. Shinoda, C. Wang, R.-C. Lien, J.N. Moum, and J.W. Wang, 2013: Effects of Solar Radiation Diurnal Cycle on the Tropical Indian Ocean Mixed Layer Variability during Wintertime Madden-Julian Oscillation Events. J. Geophys. Res., DOI:10.1002/jgrc.20395.
Li Y., W. Han, T. Shinoda, C. Wang, M. Ravichandran, J.-W. Wang, 2014: Revisiting the Wintertime Intraseasonal SST Variability in the Tropical South Indian Ocean: Impact of the Ocean Interannual Variation. J. Phys. Oceanogr., doi: http://dx.doi.org/10.1175/JPO-D-13-0238.1.
Shinoda, T,. Jensen, M. Flatau, S. Chen, W. Han, C. Wang 2013: Large-scale oceanic variability during the CINDY/DYNAMO field campaign from satellite observations. Remote Sensing –Special issue on Observing the Ocean’s Interior from Satellite Remote Sensing, 5, 2072-2092.
Shinoda, T., W. Han, E. J. Metzger, H. E. Hurlburt , 2012: Seasonal Variation of the Indonesian Throughflow in Makassar Strait. J. Phys. Oceanogr., 42, doi:10.1175/JPOD-11-0120.1.