study of the ocean circulation at the entrance of ... · importance of the “little triangle”...
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Study of the Ocean Circulation at the
Entrance of Indonesian Throughflow
CLIVAR Seminar at FIO/SOA
QIngdao, May 22, 2015
Dongliang Yuan
CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology, Chinese Academy of Sciences
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Historical study
CSK study (Nitani 1975) disclosed
the Western Pacific Ocean
circulation to be consistent with
the Munk theory
Munk(1950)J. Meteor.
Linear dynamics theory
副热带环流
亚极地环流
热带环流
Bifurcation
Sverdrup
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ENSO discharge-recharge paradigm
NEC bifurcation
El Niño:
Kuroshio↓、MC↑;
La Niña:
Kuroshio↑、MC↓
(Qiu and Lukas, 1996; Kim,
2004; Qiu and Chen, 2010)
WBC is believed to damp the warm pool recharge and discharge
Role of the WBCs in the warm pool variability not clear due to lack of observations.
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Yuan and Han 2006 JPO
Yuan and Liu 2009 JPO
Yuan et al. 2013 J Clim.
Yuan et al. 2011 J Clim.
在国际物理海洋学和气候学研究的权威学术期刊JPO和JClim上发表论文4篇
IOD can impact ENSO through Itf, the so-called “Oceanic Channel” dynamics
IOD-ENSO teleconnections 3、西太环流动力学为提高ENSO可预报性提供了基础
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Mak 11.6
Lombok 2.6
Ombai, 4.9
Timor, 7.5
Imbalance ~ 2-3 Sv (upper 200 m): uncertainty and/or missing links, partly Karimata, but mostly the broad eastern Halmahera/Maluku portal?
?
15
International Observations of the Indonesian Seas
Arlindo INSTANT
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Ocean Circulation at the ITF entrance
Kashino et al., 2007
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WEPOCE III(summer 1988)(Hacker et al., 1989; Lukas et
al., 1991)
Surface drifters
Jul-Sep,1988
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Cruise surveys
1992年10月
1994年2月
1999年2月 Kashino et al. (2001) Kashino et al.(1996)
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Mooring measurements
• WOCE IV(Kashino et al., 1999)
• June 1993-July 1994 (Cresswell and Luick,
2001)
ASEAN-Australia Regional
Ocean Dynamics Expeditions WOCE IV
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ITF entrance
Major scientific questions:
MC transport and its
interannual variations;
SEC and transports from
S. hemisphere;
Circulation and
variability of the WBC
confluence;
ITF eastern channel
transports;
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发现经典的大洋环流理论存在缺陷
2、西太环流动力学理论取得重要进展
Meridional geopstophic transoprt
Yuan et al. 2014 JPO
opposite
Sverdrup and –Ekman
Defect of the Sverdrup theory
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reduced-gravity, quasigeostrophic model
governed by the potential vorticity equation,
LR Rossby deformation radius
ψ streamfunction of a depth-averaged flow
ζ relative vorticity,
AH horizontal viscosity coefficient
β gradient of the Coriolis parameter
J() Jacobian operator.
WBC confluence
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Circulation at the entrance of the ITF
Observe and simulate the eddy shedding in the eastern Sulawesi Sea for the first time
Wang and Yuan, 2012, 2014
(JPO)
Nonlinear collision of WBCs at a
gap
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Double-Gyre WBC theory
Jiang et al, 1995 JPO Simonnet et al, 2005 JMS
Wang and Yuan,
2012, 2014, JPO
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发现经典的大洋环流理论存在缺陷
2、西太环流动力学理论取得重要进展
Yuan et al. 2014 JPO
New undercurrent in W. Pacific
NESC
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Global general circulation
AGC MVT
Wind-driven MVT
Difference
Super Gyre?
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Western Pacific mooring array
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MUC and its ISV
8ºN
Zhang, Hu, et al., 2014, JGR
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2014 RCO/LIPI-IOCAS Joint Cruise
Nov. 14-29, 2014, retrieve a mooring
deployed in the Malugu Strait in Dec.
2012 with 2 years of time series.
model 50-300m
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Lombok mooring
Mooring station CTD cast
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Karimandan Strait
Accumulate 7 years of time series
获取的海流连续观测资料
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Rotate mooring
New moorings
2015 cruise plan
Agreement signed(2014-2018)
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2015 Prospect 专项-基金委开放航次联合航次
Aug. – Oct. 2015
2015 NSFC Shared Open Cruise
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Importance of the “Little Triangle” circulation
“The Little
Triangle” Cross road of
different masses
and oceanic waves;
Path of the ITF;
One of the most
complicated
circulation system
in the world ocean.
Due to lack of observations, the
ocean circulation at the Pacific
Entrance of ITF have not been
studied well.
Mean transport of ITF: 8-10 Sv;
Interannual anom. of ITF: <0 – 26 Sv;
IA of heat transport: ~net heat flux over WP
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IOCAS/RCO-LIPI cooperation