The formation and dynamics of cold- dome northeast of Taiwan Mao-Lin Shen 1 Yu-Heng Tseng 1 Sen Jan 2 1 Atmospheric Sciences,

Slides:

Advertisements

Similar presentations

Wind-Driven Circulation in a Stratified Ocean Consider the ocean in several isopycnal layers that can be separated into two groups: Layers that outcrop.

Advertisements

Thermohaline circulation ●The concept of meridional overturning ●Deep water formation and property Antarctic Bottom Water North Atlantic Deep Water Antarctic.

The formation and dynamics of cold-dome northeast of Taiwan 報告人：沈茂霖 (Mao-Lin Shen) 2015/5/17 Seminar report.

Physical Oceanographic Observations and Models in Support of the WFS HyCODE College of Marine Science University of South Florida St. Petersburg, FL HyCode.

Generalized Surface Circulation

(a)(b)(c) Simulation of upper troposphere CO 2 from two-dimensional and three-dimensional models Xun Jiang 1, Runlie Shia 2, Qinbin Li 1, Moustafa T Chahine.

MODULATING FACTORS OF THE CLIMATOLOGICAL VARIABILITY OF THE MEXICAN PACIFIC; MODEL AND DATA. ABSTRACT. Sea Surface Temperature and wind from the Comprehensive.

=(S,,0); 4=(S,,4000).

Mid-Atlantic Bight Transport over a Long Shallow Shelf.

Potential temperature ( o C, Levitus 1994) Surface Global zonal mean.

Climate Change Projections of the Tasman Sea from an Ocean Eddy- resolving Model – the importance of eddies Richard Matear, Matt Chamberlain, Chaojiao.

The Physical Modulation of Seasonal Hypoxia in Chesapeake Bay Malcolm Scully Outline: 1)Background and Motivation 2)Role of Physical Forcing 3)Simplified.

Sustained Ocean Observations in Support of Sea Surface Salinity Process Studies Gustavo Jorge Goni National Oceanic and Atmospheric.

Effects of Ocean-Atmosphere Coupling in a Modeling Study of Coastal Upwelling in the Area of Orographically-Intensified Flow Natalie Perlin, Eric Skyllingstad,

Equatorial Atmosphere and Ocean Dynamics

Evaporative heat flux (Q e ) 51% of the heat input into the ocean is used for evaporation. Evaporation starts when the air over the ocean is unsaturated.

“ New Ocean Circulation Patterns from Combined Drifter and Satellite Data ” Peter Niiler Scripps Institution of Oceanography with original material from.

“ Combining Ocean Velocity Observations and Altimeter Data for OGCM Verification ” Peter Niiler Scripps Institution of Oceanography with original material.

1.Introduction 2.Description of model 3.Experimental design 4.Ocean ciruculation on an aquaplanet represented in the model depth latitude depth latitude.

The Kuroshio: Observations, Modeling and Interpretations Chau-Ron Wu National Taiwan Normal University Academia Sinica on Novermber 19, 2012http://phyoce.es.ntnu.edu.tw/

Mode (Eighteen Degree) Water V.Y. Chow EPS Dec 2005.

Term Paper Guide Find an oceanic or relevant atmospheric phenomenon you are interested in (e.g., ENSO, PDO, AMO, TAV, IOD, NAO, hurricane activity, regional.

RA-228 AND RA-226 FROFILES FROM THE NORTHERN SOUTH CHINA SEA Hsiu-Chuan Lin, Yu-Chia Chung and Chi-Ju Lin Institute of Marine Geology and Chemistry, National.

Sara Vieira Committee members: Dr. Peter Webster

Southern Ocean Surface Measurements and the Upper Ocean Heat Balance Janet Sprintall Sarah Gille Shenfu Dong Scripps Institution of Oceanography, UCSD.

Regional Air-Sea Interactions in Eastern Pacific 6th International RSM Workshop Palisades, New York July 11-15, th International RSM Workshop Palisades,

Regional Scale Variability in Eastern Pacific: Relevance to SPURS-2 Campaign Janet Sprintall, Scripps Institution of Oceanography MoorSPICE Cruise, Solomon.

The Linear and Non-linear Evolution Mechanism of Mesoscale Vortex Disturbances in Winter Over Western Japan Sea Yasumitsu MAEJIMA and Keita IGA (Ocean.

Investigation of Mixed Layer Depth in the Southern Ocean by using a 1-D mixed layer model Chin-Ying Chien & Kevin Speer Geophysical Fluid Dynamics Institute,

Typical Distributions of Water Characteristics in the Oceans.

Summary Report Lecturer: Chia-Ping Chiang Date: 2009/Jun/25.

Long-term variability of the Kuroshio Transport East of Taiwan and the climate it conveys Mao-Lin Shen 1 Yu-Heng Tseng 1,

Regional Oceanography I

Global Ocean Circulation (2) 1.Wind-driven gyre-scale circulation of the surface ocean and upper thermocline 2.Global heat and freshwater water transport,

Oceanic mixed layer heat budget in the Eastern Equatorial Atlantic using ARGO floats and PIRATA buoys M. Wade (1,2,3), G. Caniaux (1) and Y. du Penhoat.

Class 8. Oceans Figure: Ocean Depth (mean = 3.7 km)

Cross-Gyre Thermohaline Transport in the Tropical Atlantic: The role of NBC Rings Bill Johns Zulema Garraffo Division of Meteorology and Physical Oceanography.

One float case study The Argo float ( ) floating in the middle region of Indian Ocean was chosen for this study. In Figure 5, the MLD (red line),

Estimating Vertical Eddy Viscosity in the Pacific Equatorial Undercurrent Natalia Stefanova Masters Thesis Defense October 31, 2008 UW School of Oceanography.

Geostrophy, Vorticity, and Sverdrup

A QUASI-GLOBAL CONFIGURATION OF ROMS (OR, TOWARDS GOMS?) Guillermo Auad & Art Miller (CRD/SIO) Grid features : ● zonal resolution: 0.8º (fixed); meridional.

On the effect of the Greenland Scotland Ridge on the dense water formation in the Nordic Seas Dorotea Iovino NoClim/ProClim meeting 4-6 September 2006.

Wind-SST Coupling in the Coastal Upwelling --- An Empirical Numerical Simulation X. Jin, C. Dong, and J. C. McWilliams (IGPP/UCLA) D. B. Chelton (COAS/OSU)

Coastal Oceanography Outline Global coastal ocean Dynamics Western boundary current systems Eastern boundary current systems Polar ocean boundaries Semi-enclosed.

(a)(b)(c) Simulation of upper troposphere CO 2 from two-dimensional and three-dimensional models Xun Jiang 1, Runlie Shia 2, Qinbin Li 1, Moustafa T Chahine.

G. Panteleev, P.Stabeno, V.Luchin, D.Nechaev,N.Nezlin, M.Ikeda. Estimates of the summer transport of the Kamchatka Current a variational inverse of hydrographic.

Page 1© Crown copyright 2006 Boundary layer mechanisms in extra-tropical cyclones Bob Beare.

Forces and accelerations in a fluid: (a) acceleration, (b) advection, (c) pressure gradient force, (d) gravity, and (e) acceleration associated with viscosity.

SPURS Synthesis Research Objectives: Budget calculations Resolve important terms of the freshwater and heat budgets of the upper 1000 m on temporal scales.

Bimodal Behavior of the Seasonal Upwelling off the northeastern coast of Taiwan Yu-Lin Eda Chang Department of Earth Sciences, National Taiwan Normal University,

Tropical Atlantic SST in coupled models; sensitivity to vertical mixing Wilco Hazeleger Rein Haarsma KNMI Oceanographic Research The Netherlands.

Eddies in the Beaufort Sea & its impact to ecosystem Watanabe (2011, JGR) & Nishino et al. (2011, GRL) 2) Preliminary results of XCTD measurement during.

Sverdrup, Stommel, and Munk Theories of the Gulf Stream

Seasonal Variations of MOC in the South Atlantic from Observations and Numerical Models Shenfu Dong CIMAS, University of Miami, and NOAA/AOML Coauthors:

How ENSO influence the Luzon Strait transport 汇报人：叶瑞杰专业年级： 2016 级物理海洋博士.

TAIYO KOBAYASHI and Shinya Minato

Bruce Cornuelle, Josh Willis, Dean Roemmich

Oliver Elison Timm ATM 306 Fall 2016

MONSOONS AND OCEAN CURRENTS Figure 10.15

Kuang Fangfang, Pan Aijun, Zhang Junpeng

SHALLOW SHELF UPWELLING DYNAMICS AND COOL WATER MIXING BETWEEN TWO DIFFERENT REGION THROUGH KARIMATA STRAITS M. F. Akhir, P.H. Kok, Z. Zainol Institute.

Observations of the North Atlantic Subtropical Mode Water

Impact of the vertical resolution on Climate Simulation using CESM

Mark A. Bourassa and Qi Shi

Aura Science Team meeting

TALLEY Copyright © 2011 Elsevier Inc. All rights reserved

LT Ricardo Roman OC3570 March 7, 2006

Ship observation and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea Rui.

Predictability of Tropical Cyclone Genesis in the IPRC Regional Model

Lecturer: Chia-Ping Chiang Date: 2009/5/7

Presentation transcript:

The formation and dynamics of cold- dome northeast of Taiwan Mao-Lin Shen 1 Yu-Heng Tseng 1 Sen Jan 2 1 Atmospheric Sciences, Nation Taiwan University, Taiwan (R.O.C.) 2 Institute of Oceanography, Nation Taiwan University, Taiwan (R.O.C.) October 26, 2010

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Outline Overview of the documented cold-dome and suggested formation mechanisms Temporal SST variation during and Argo data northeast of Taiwan Numerical model and the associated results Analysis of formation mechanisms Conclusion

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page 3 Introduction (1/5) Sea Surface Temperature (SST) November

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Introduction (2/5) An active upwelling and nutrient-rich area The exchange of Kuroshio Water and Continental Water of East China Sea (Isobe, 2008; Matsuno et al., 2009) Fundamental characteristics have been well- documented by Gong et al. (1992), Lin et al. (1992), Tang and Tang (1994), Chen et al. (1995) and Tang et al. (1999), etc.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Introduction (3/5) Cheng, Ho et al., 2009, Sensors Chen, 1995 Kuroshio Tropical Water Kuroshio Surface Water

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page 6 Introduction (4/5) Liu et al., 1992 Suggested the year round upwelling should be 5 m/day. Chen et al., 1995 Contribution of Kuroshio Water Kuroshio Tropical Water Hsueh, Wang, Chern, 1992, JGR. Stated how the baroclinic transport work in this region.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page 7 Introduction (5/5) What contribute to the formation mechanisms of cold- dome ? Which one dominates the formation process? What kind of connections between cold-dome and the surrounding currents, e.g. Kuroshio and Taiwan Strait flow?

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Observation (1/3) ─ MW and IR merged SST May May Jul Typhoon Fung- Wong passed on Jul 28. Nov Area for meridional averaging Hovmoller plot

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Time-longitude plot of filtered SST north of Taiwan. the dashed lines denote typhoons from left to right is Kalmaegi, Fung-Wong, Sinlaku and Jangmi, respectively. Of 2009 the dashed line denotes typhoon Morakot.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Observation (3/3) ─ cold-dome in winter Argo float, WMOID , for (a) the trajectory; (b) MW_IR SST and a marker denotes the Argo data on December 16, The rests are subsurface comparisons of (c) temperature and (d) salinity.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page 11 DUPOM (North Pacific adaptation of TIMCOM)

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Numerical model (1/2) Surface sources of heat and fresh water Levitus94 seasonal climatology Bathymetry unfiltered ETOPO-2 depth data supplemented with the Taiwan’s NCOR 1-minute high accuracy depth archive in the Asian Seas Winds stress monthly Hellerman and Rosenstein winds stress Vertical mixing Modified Richardson number dependent formula based on Pacanowski and Philander (1981)

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Numerical model (2/2) ─ Domain

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Numerical results (1/4) On day 157, Year 37 Model results Z = 6 mZ = 54 m Z = 75 m Z = 98 m

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Numerical results (2/4) ─ Trajectories Kuroshio Tropical Water (KTW), m.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Numerical results (3/4) ─ Trajectory North Mien-Hua Canyon Mien-Hua Canyon A trajectory shows the route of Kuroshio Tropical Water. The background flow field are model results at z = 159 m.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (1/10) Possible mechanisms Wind-driven Ekman upwelling Boundary layer effect Current-driven Ekman upwelling Ekman boundary mixing Dynamic uplift due to geostrophic adjustment mesoscale eddy Kuroshio Topographically controlled upwelling Vertical mixing

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (2/10) Wind-driven Ekman upwelling Boundary layer effect Current-driven Ekman upwelling Ekman boundary mixing Dynamic uplift: mesoscale eddy Kuroshio Topographical upwelling Vertical mixing Garrett et al. (1993), ARF. Boundary mixing

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (3/10) Wind-driven Ekman upwelling Boundary layer effect Current-driven Ekman upwelling Ekman boundary mixing Dynamic uplift: cyclonic eddy Kuroshio Topographical upwelling Vertical mixing

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis ─ Wind-driven upwelling Wind-driven Ekman upwelling, : the thickness of Ekman layer Chang, Wu and Oey, 2009 Mean: -0.3 m/day Max: 0.7 m/day Wind-driven Ekman upwelling Needs 4~5 months to uplift 100 m with maximum upwelling velocities (7)

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis ─ Boundary layer effects Boundary layer effect Current-driven Ekman upwelling Max: only about m/day Ekman boundary mixing Meridional current velocity distribution (Tang et al., 2000). Garrett et al. (1993), ARF. Boundary mixing W (m/day) Garrett et al. (1993), ARF. Boundary mixing Inverse currents introduced little dowelling transport.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (6/10) Wind-driven Ekman upwelling: -0.3 m/day Boundary layer effect Current-driven Ekman upwelling: m/day Ekman boundary mixing: inverse flow Dynamic uplift mesoscale eddy Kuroshio Topographically controlled upwelling Vertical mixing Isotherm redistribution due to upwelling. Zonal temperature profile at 25.6°N Buoyancy instabilityDiffusion, little H. Advection Temperature increasing UpwellingMixing

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (7/10) Isothermal plain have lower depth east of Kuroshio and higher depth on CDFR. The isothermal plain on CDFR can be shallower than 50 m deep. Isothermal plain at 21 ℃ calculated by model output.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (8/10) ─ Isotherm uplift Comparison of uplift height introduced by different mechanism. Topographical upwelling, eddy-introduced dynamic uplift and other minor effects.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (9/10) ─ Topographic effects Only the realistic bathymetry can constrain sufficient cold water source for surface cold-dome formation. Flow field and temperature at 50 m numerical experiments. (a) Realistic bathymetry (b) Deepened Case(c) Shallowed Case

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis (10/10) ─ vertical mixing Instantaneous zonal profiles of temperature and eddy diffusivities at 25.6°N. The vertical temperature gradient near surface coupled with the high surface eddy diffusivities suggested energetic vertical heat transfer in surface cold-dome. (a) Zonal Temperature ( ℃ ) profile (b) Vertical eddy diffusivities (cm 2 /s)

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Conclusion (1/2) Different cold-dome patterns from the observations. Evident cold-domes can be found due to the typhoons. Dynamic uplift introduced by Kuroshio dominates the fundamental pattern of cold-dome. Bathymetry not only suggests topographically controlled upwelling, but also constrains cold water in deep sea northeast of Taiwan.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Conclusion (2/2) Mesoscale eddy contributes few dynamic uplift but can reduces horizontal advection for cold-dome. Dynamic due to the surface and bottom boundary layers is too weak for the observed cold-dome formation. Vertical mixing plays an important role for surface cold-dome formation.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Thank you for your attention. Questions?

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Observation ─ Argo floats Fig. 5. The Argo data, marked as red solid circles, since 3 August 2001 to 6 September 2009 in the study region, only 2047 data are available. Argo data gathered on Kuroshio main stream totally 21 profiles in from May to October, stand for summer pattern (b), and 12 profiles in from November to April, stand for winter pattern (c). (a) (b) (c)

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Mechanism Analysis ─ Uplift height Take the depth of isotherm 21 ℃ at 122.8°E and 24.4°N as reference. Large uplifted height in summer. Fig. 15. Contour of Uplift height.

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page /5/9 Observation ─ cold-dome in summer Fig. 7. Argo float, WMOID , for (a) trajectory of the float; (b) MW_IR SST and the a marker denotes the Argo data on 17 July The rest figures are subsurface comparisons of (c) temperature, (d) salinity, and (e) T-S profiles of the four measures. Typhoon Kalmaegi passed this region on July The path of Typhoon Kalmaegi are marked as hollow circles in (a).

Mao-Lin Shen, Yu-Heng Tseng and Sen Jan Page 35