Spiciness anomalies generated in the SouthEast Pacific are subducted in the thermocline and flow in the SEC towards the SouthWest Pacific (Fig 1). The.

Slides:



Advertisements
Similar presentations
Understanding Potential Factors Influencing the ITF in the 21 st Century Tony Lee NASA Jet Propulsion Laboratory California Institute of Technology.
Advertisements

Clima en España: Pasado, presente y futuro Madrid, Spain, 11 – 13 February 1 IMEDEA (UIB - CSIC), Mallorca, SPAIN. 2 National Oceanography Centre, Southampton,
Preliminary results on Formation and variability of North Atlantic sea surface salinity maximum in a global GCM Tangdong Qu International Pacific Research.
Downstream weather impacts associated with atmospheric blocking: Linkage between low-frequency variability and weather extremes Marco L. Carrera, R. W.
Interannual Variability in Summer Hydroclimate over North America in CAM2.0 and NSIPP AMIP Simulations By Alfredo Ruiz–Barradas 1, and Sumant Nigam University.
Response of the Atmosphere to Climate Variability in the Tropical Atlantic By Alfredo Ruiz–Barradas 1, James A. Carton, and Sumant Nigam University of.
Experiment Design: Validation: Ocean mesoscale variability was estimated on eddy kinetic energy (EKE), calculated from TOPEX/ Poseidon, ERS-1/-2 and Jason.
SSH anomalies from satellite. Observed annual mean state Circulation creates equatorial cold tongues eastern Pacific Trades -> Ocean upwelling along Equator.
Propagation of wave signals along the western boundary and their link to ocean overturning in the North Atlantic Vassil Roussenov 1, Ric Williams 1 Chris.
Morphology and forcing of intra-seasonal Kelvin waves in the tropical Atlantic. Irene Polo (Univ. Complutense Madrid) Alban Lazar (LOCEAN-IPSL) Belen Rodriguez-Fonseca.
Propagation of wave signals in models and altimetry for the North Atlantic Vassil Roussenov 1, Chris Hughes 2, Ric Williams 1, David Marshall 3 and Mike.
Average circulation, seasonal cycle and mesoscale dynamics of the Peru Current System: A modeling approach Pierrick Penven (IRD), Vincent Echevin (IRD),
The 1997/98 ENSO event. Multivariate ENSO Index Index is based on 6 parameters relevant to phase.
Chapter 5: Other Major Current Systems
Simulated Sea Surface Salinity Variability in the Tropical Pacific Xiaochun Wang Yi Chao JPL/Caltech Terrain-Following Ocean Models User Workshop Seattle,
El Nino Southern Oscillation (ENSO) 20 April 06 Byoung-Cheol Kim METEO 6030 Earth Climate System.
MODULATING FACTORS OF THE CLIMATOLOGICAL VARIABILITY OF THE MEXICAN PACIFIC; MODEL AND DATA. ABSTRACT. Sea Surface Temperature and wind from the Comprehensive.
Modes of Pacific Climate Variability: ENSO and the PDO Michael Alexander Earth System Research Lab michael.alexander/publications/
Wave communication of high latitude forcing perturbations over the North Atlantic Vassil Roussenov, Ric Williams & Chris Hughes How changes in the high.
Review High Resolution Modeling of Steric Sea-level Rise Tatsuo Suzuki (FRCGC,JAMSTEC) Understanding Sea-level Rise and Variability 6-9 June, 2006 Paris,
Eda Selected Slides Tide Gauge.
Spatial coherence of interannual variability in water properties on the U.S. northeast shelf David G. Mountain and Maureen H. Taylor Presented by: Yizhen.
The meridional coherence of the North Atlantic meridional overturning circulation Rory Bingham Proudman Oceanographic Laboratory Coauthors: Chris Hughes,
“ Combining Ocean Velocity Observations and Altimeter Data for OGCM Verification ” Peter Niiler Scripps Institution of Oceanography with original material.
Assimilated Taiwan Ocean Prediction (ATOP) & Climate Research at NCU by Leo Oey March
IWMO-2010, May 24 Fanghua Xu and Leo Oey Princeton University
Modulation of eastern North Pacific hurricanes by the Madden-Julian oscillation. (Maloney, E. D., and D. L. Hartmann, 2000: J. Climate, 13, )
Scientific Needs from the Climate Change Study in the Ocean Toshio Suga Tohoku University (Japan) International Workshop for GODAR-WESTPAC Hydrographic.
Low Frequency Variability of Subtropical North Pacific Ocean Circulation and Its Impacts on the Dynamic Environment of the Marginal Seas (NPOIMS) Chief.
Transport in the Subpolar and Subtropical North Atlantic
Eda Tide Gauge & AVISO. background John et al. (2001) Tide gauge ∆SSHA Observed Kuroshio transport fv=g(d ƞ /dx ) Goal: Kuroshio variation east.
Assuming 16 cm standard deviation. The final result – 5 of these records were noisy Halifax Grand Banks Line W 4100 m 2700 m 3250 m 2250 m 1800 m.
Sara Vieira Committee members: Dr. Peter Webster
Observation Plans in West Pacific Jianping Li 1), Guoxiong Wu 1) and Fan Wang 2) 1) LASG, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences.
Complex 2D Fields: Analysis of Eddies in the Southern Indian Ocean Project Leader: Greta Leber Joni Lum Changheng Chen David Yeomans Amelia Nahmias.
The Influence of the Indonesian Throughflow on the Eastern Pacific Biogeochimical Conditions Fig.1 The last year of the two runs is used to force offline.
11 Predictability of Monsoons in CFS V. Krishnamurthy Center for Ocean-Land-Atmosphere Studies Institute of Global Environment and Society Calverton, MD.
Annual and semi-annual variations of equatorial Atlantic circulation associated with basin mode resonance Peter Brandt 1, Martin Claus 1, Richard J. Greatbatch.
U.S. Navy Global Ocean Prediction Update Key Performers: A.J. Wallcraft, H.E. Hurlburt, E.J. Metzger, J.G. Richman, J.F. Shriver, P.G. Thoppil, O.M. Smedstad,
Bifurcation Dynamics L. Gourdeau (1), B. Kessler (2) 1), LEGOS/IRD Nouméa, New Caledonia, 2) NOAA/PMEL, Seattle, USA Why is it important to study the bifurcation.
Improved Satellite Altimeter data dedicated to coastal areas :
1 Daily modes of the South Asian monsoon variability and their relation with SST Deepthi Achuthavarier Work done with V. Krishnamurthy Acknowledgments.
Variations in the Activity of the Madden-Julian Oscillation:
1 Xujing Jia Davis Graduate School of Oceanography, University of Rhode Island Lewis M. Rothstein Graduate School of Oceanography, University of Rhode.
North Atlantic dynamical response to high latitude perturbations in buoyancy forcing Vassil Roussenov, Ric Williams & Chris Hughes How changes in the high.
Long-term variability of the Kuroshio Transport East of Taiwan and the climate it conveys Mao-Lin Shen 1 Yu-Heng Tseng 1,
Using the Argo Dataset to Describe the North Atlantic SubPolar Mode Water T. Hascoet, H. Mercier, V. Thierry, E. Autret, F. Gaillard Laboratoire de Physique.
TOGA Pan-Pacific Surface Current Study NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) April 1988 Miami, Florida.
Changes in the South American Monsoon and potential regional impacts L. Carvalho, C. Jones, B. Bookhagan, D. Lopez-Carr UCSB, USA A.Posadas, R. Quiroz.
Propagation of wave signals along the western boundary and their link to ocean overturning in the North Atlantic Vassil Roussenov 1, Ric Williams 1 Chris.
Interannual to decadal variability of circulation in the northern Japan/East Sea, Dmitry Stepanov 1, Victoriia Stepanova 1 and Anatoly Gusev.
Ocean Data Assimilation for SI Prediction at NCEP David Behringer, NCEP/EMC Diane Stokes, NCEP/EMC Sudhir Nadiga, NCEP/EMC Wanqiu Wang, NCEP/EMC US GODAE.
UBC/UW 2011 Hydrology and Water Resources Symposium Friday, September 30, 2011 DIAGNOSIS OF CHANGING COOL SEASON PRECIPITATION STATISTICS IN THE WESTERN.
Exploring the mesoscale activity in the Solomon Sea: a complementary approach with a numerical model and altimetric data L. Gourdeau 1, J. Verron 2, A.
THE BC SHELF ROMS MODEL THE BC SHELF ROMS MODEL Diane Masson, Isaak Fain, Mike Foreman Institute of Ocean Sciences Fisheries and Oceans, Canada The Canadian.
6/14/2016AOMIP Sea level Atlantic-to-Arctic: an examination of the altimeter record Gennady Chepurin and James Carton Dept. Atmospheric and Ocean.
Towards downscaling oceanic hydrodynamics - Suitability of a high-resolution OGCM for describing regional ocean variability in the South China Sea 针对海洋水动力的降尺度.
The impact of lower boundary forcings (sea surface temperature) on inter-annual variability of climate K.-T. Cheng and R.-Y. Tzeng Dept. of Atmos. Sci.
Seasonal Variations of MOC in the South Atlantic from Observations and Numerical Models Shenfu Dong CIMAS, University of Miami, and NOAA/AOML Coauthors:
M. Roberts, P. L. Vidale, D. Stevens, Ian Stevens, Len Shaffrey, UJCC team with help from many others at Met Office and NCAS-Climate and CCSR/NIES/FRCGC.
Complication in Climate Change
Spatial Modes of Salinity and Temperature Comparison with PDO index
2016 ROMS Asia-Pacific Workshop, Hobart, Australia
A Comparison of Profiling Float and XBT Representations of Upper Layer Temperature Structure of the Northwestern Subtropical North Atlantic Robert L.
TAV / PIRATA-17 Meeting, Kiel, Germany
Characteristics of mesoscale eddies in the Southwest Pacific
Meng Zhang (张萌), Hans von Storch
RAPID AND SLOW COMMUNICATION OF OVERTURNING
2.3.1(iii) Impacts of El Nino
Impacts of El Nino Observations Mechanisms for remote impacts.
Presentation transcript:

Spiciness anomalies generated in the SouthEast Pacific are subducted in the thermocline and flow in the SEC towards the SouthWest Pacific (Fig 1). The SEC feeds the Solomon Sea western boundary New Guinea Coastal Undercurrent (NGCU) which is a primary source of the EUC. Thus, variations of the NGCU characteristics might impact on the equatorial features and more generally on decadal climate variability. Therefore, the study of the Solomon Sea is one of the key issues of the SPICE program. Here, we focus on the variability of the Solomon Sea in term of sea level. It is a region of high sla variability (Fig 2), mostly because of ENSO (Ridgway 1993) and the SECC variability for the annual period (Qiu and Chen 2004 and Chen and Qiu 2004). However, previous altimetric studies didn’t distinguished this semi closed sea from the rest of the SouthWest Pacific since they used gridded products. We propose an original method to focus on the Solomon Sea and its specific behaviour. 1. Introduction 2. Methods 3. Results This study reveals a high sla variability in the Solomon Sea, mainly at interannual and seasonal time scales. The Solomon Sea evolves in phase but most of the variability is in the eastern part, characterized by complex recirculations, even if the western part is governed by a WBC dynamic. The eastern part is highly related to the east side of the Solomon islands at both seasonnal and interannual time scales. This can be due to the penetration of Rossby waves in the Solomon strait. At seasonnal time scale, there is no transport from the south of 11°S into the Solomon Sea : the seasonal variability is generated by Rossby waves from the east of the Solomon Islands and / or local wind forcing. At interannual time scale, the high variability in the Solomon Sea is associated with high eke. The Bismark Sea and the east side of the Solomon Islands signals are highly related. What is the exact role played by the NGCC to transport anomalies signal to the equator? At this time, we are not able to depict the variability associated to the narrow NGCC but we will investigate it with along track altimetric data. It could explain why the variability in the west is so small. Most of these questions will be investigated from a modelling approach with a hierarchy of high resolution (1/4° 1/12°) regional models. The altimetric dataset will be used to perform a realistic simulation of the regional circulations through data assimilation. 4. Conclusions/Perspectives VARIABILITY IN THE SOLOMON SEA FROM ALTIMETRIC SEA LEVEL DATA Angélique Melet 1, Lionel Gourdeau 2, William S. Kessler 3, Jacques Verron 1 1.LEGI, France 2. LEGOS, IRD Nouméa 3. NOAA/PMEL, Seattle Altimetric Data : This work is based on original along track Topex-Poseidon data (Fig4). New data processing (CTOH/LEGOS) has been applied to recover proper data and to gain more information on the altimetric signal (Fig 5) in this region of complex topography with numerous islands (Fig 3). A track by track specific and customized post processing has been used to finalize the dataset. We also used the AVISO sla gridded product for the T/P period. Tide Gauges : These new altimetric data have been assessed against tide gauge data (JASL dataset, daily SSH corrected from atmospheric effects with altimetric corrections). 11 tide gauges were used (Fig 4), an exemple is given for Honiara and TP086. Numerical Simulations : Model 1 : - Resolution : ¼°, 46 levels. - Regional with four open and radiative boundaries forced by the Drakkar OGCM. - Interannual forcing (CORE –radiations and precipitations- and ERA40 – atmospheric data-). - Initial conditions : Levitus T and S fields. - Starts in Years 1991 to 2000 have been exploited. Model 2 : model 1 with a nested high resolution grid over the Solomon Sea. - Resolution : 1/12° -Nest : Agrif 2 ways (retroaction of the fine grid on the coarse grid). Fig 1. Source : Spice Spice Scientific Background. Salinity on the isopycnal 25.5 (color) and isopycnal depth (contours) from Levitus climatology. Fig 2. Rms of sla from aviso gridded product. Fig 9. Mean vertical transport from the regional simulation ( ). Fig 7. Track TP086 and Honiara tide gauge positions. Fig 8. Altimetric and tide gauge sla time series. Raw dataInter annual SeasonalIntra seasonal Fig 11. Rms of sla for different temporal scale. Fig 15. Eof of sla from aviso gridded product Mode 1. Fig 17. Aviso gridded product 1 cpy harmonic.  1/4° resolution isn’t enough to generate eddy scales, thus the variability isn’t well represented in the model.  The first mode of sla eof represents 71% of the variance in altimetric data and seems to be highly correlated with ENSO.  The high sea level variability in the northeastern part of the Solomon Sea occurs in an area of high EKE which exhibits a high interannual activity.  Strongest sla variability in the PSW is located on each side of the Solomon Islands from Interannual to seasonnal time scales.  The interannual signal is higher than the annual cycle.  In the Solomon Sea, there is a lower variability on the west side (characteristic of the WBC) than on the east side (complex recirculations dynamic).  Emergence of a 60 days frequency in the Solomon Sea ?  The eastern and western parts of the Solomon Sea are not directly correlated.  The western part of the Solomon Sea is better correlated with the south side of PNG (NGCC fed by NQC and maybe by a more direct path from the Coral Sea at the Louisiade archipelago).  The eastern part of the Solomon Sea is better correlated with the east side of the Solomon Islands (the archipelago is not an obstacle for the sla signal).  The Bismarck Sea is better correlated with the east side of the Solomon Islands than with the western part of the Solomon Sea. Fig 4. TP tracks, tide gauges. Fig 5. Number of cycles and sla rms for aviso and the new altimetric dataset (TP251).  Maximum of amplitude in the SE part of the Solomon Sea.  Phase jump at the south limit of the Solomon Sea : no direct inflow between 155 and 163°E.  Rossby waves propagation near 6.5°S east of the Solomon Sea.  Solomon Sea evolves in phase with sla maximum in march (phase of the Rossby wave entering by the Solomon Strait. Fig 20. Amplitude and phase for the 1 cpy harmonic. The phase jump at 10°S isn’t similar to the altimetric one, because of a ill- defined bathymetry ? Fig 19. Eof for interannual sla. Maximum of variability isn’t north enough. Different temporal variabilities : Fig 12. Rms of sla and spectrum in the Solomon Sea. Relations between different areas in and around the Solomon Sea : East of Solomon Islands Solomon Sea, East side North of New Britain 3°S East of the Solomon Is. West Solomon Sea side East Solomon Sea side South of PNG,Coral Sea West Solomon Sea side South of PNG:11.5,13°S West Solomon Sea side Fig 13. Mean areas in and around the Solomon Sea spectrum and sla time series. Interannual variability : Fig 14. Mean EKE from aviso gridded product Fig 16. EKE time serie for 150:155°E 5:9°S from aviso gridded product Seasonal variability : Model : Fig 18. Hovmuller of seasonal sla at 6.5°S.