観測船「みらい」航海MR12-03航海における船内セミナー発表スライド・学生時代から現在に至る研究テーマ紹介

1. Integrated oceanic observation
in the western equatorial Pacific
related to SPICE project
JAMSTEC/RIGC Takuya HASEGAWA

2. OUTLINE
(1) About Me
(2) My study history (briefly shown)
(3) SPICE-related observation during MR12-03

3. About me

4. Takuya Hasegawa (JAMSTEC/IORGC)
April 2007-present: JAMSTEC
April 2003-March 2007: JMA/MRI (JSPS Researcher)
April 1994-March 2003：Tohoku University (B.S., M.S., Ph.D.)
Tohoku University
JMA/MRI
JAMSTEC
Niigata-city
Pacific Ocean
Japan Sea

5. My Study
Mainly, tropical Pacific
(El Nino, etc.)

6. (2) My Study
Past and on-going my main study topics:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

7. Background: 平年時とエルニーニョ時の海面水温パターン
Sea surface temperature patterns in normal and El Nino condition
B
エルニーニョ時
（1997/11）
A
平年値
(11月)
B-A
平年偏差
海面水温 (sea surface temperature)
warm water pool
（暖水プール）
Nino3-index>0
東へ:Eastward shift of warm water pool
気象庁データ同化システム(ODAS)
Normal years average
(Nov.)
El Nino year (Nov.1997)
Difference (Anomaly)
(top minus middle)

8. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

9. 海洋表層貯熱量 (OHC: upper ocean heat content)
太平洋パターン (wavelet power）:
PDO (20yr)
QD (10yr)
ENSO (4yr)
QB (2yr)
(Hasegawa and Hanawa 2003より）
ENSO: 4yr
QD: 12yr
PDO: 20yr
中部赤道域
やや南側で
信号（大）
中緯度・黒潮・親潮
サブダクション経路
信号（大）
フィリピン海
西部赤道域
中部赤道域
東部赤道域で
信号（大）
各タイムスケールで
海域における振幅の強さが異なる
Different spatial pattern of wavelet
power at each time-scale
海面水温では分からない、
海洋内部の信号をOHCで把握できる
Large OHC signal of warm water pool

10. complex EOF 第１モード（寄与率６０％）
周期はおよそ3.5年（℃）
86/87
91/92
94
97/98
82/83
反時計回りの伝播
Anti-clockwise
propagation
A
B
C
D
0 年
0.5年
1.0年
1.5年
東進
east
ward
西進
west
ward
（年）
反時計回りの伝播：ENSOに関係
西部熱帯太平洋における OHC 偏差の強化
西部熱帯太平洋(WTP)
東部赤道太平洋
エルニーニョ発生期間と一致
El Ninoに関係したOHC伝播特性 (OHC propagation related to El Nino)
ENSOメカニズム理解・モデル評価に貢献
(Hasegawa and Hanawa 2003)
南北太平洋での伝播や輸送量の違い
(Haegawa et al. 2006; 2008)

11. 負相関：大
Negative
Correlation
相関：小
（OHC偏差：強化）
西部熱帯太平洋(WTP)
OHCの時間変化率と風応力カール（WSC）の相関係数
Correlation coef. bet. OHC and wind stress curl
負のWSC（高気圧性循環）
↓
Ekman downwelling
↓
水温躍層深度（深）
↓
OHC偏差：増加
西部赤道外熱帯太平洋の大気海洋変動特性
Oceanic and atmospheric variability in the western off-equatorial
Pacific
Possible air-sea interaction
in (east of) Philippine Sea
(Hasegawa and Hanawa 2007)

12. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

13. A
B
C
D
A
B
C
D
El Nino 10 yr scale
(QD-scale)
(yr)
(yr)
東部赤道域で信号大
東部赤道域で信号弱
recharge-discharge oscillator model的振る舞いと
伝播特性が合致して変動（Hasegawa et al. 2007）
Hasegawa and Hanawa (2003)PDO (Pacific Decadal Oscillation)とは異なる現象
北太平洋熱帯域で、反時計回りの伝播
Anti-cyclonic propagations are found at
- ENSO : ４ year time-scale
- 10年スケール(QD)変動：~10 year time-scale
- 10年スケールは南太平洋でも伝播信号を示す
（ENSOは南米沖でしか示さない）
10年スケールとエルニーニョ変調の関係
Relationship bet. QD-scale and modulation of El Nino
（Hasegawa and Hanawa 2006）

14. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

15. 北太平洋中緯度における数十年スケール変動
Multi-decadal variability in the mid-North Pacific
Mid-latitude of North Pacific：
OHC: clockwise propagation
（about 30-year time-scale）
East of Japan/Mid-Pacific：
OHC・SST・SLP: in phase
（大気海洋相互作用の可能性）
OHC propagation：
アリューシャン低気圧(NPI指数)
北太平洋亜熱帯モード水コア水温・
黒潮流量(気象庁G線)・
水平熱輸送（モデル結果）と関連
相関係数（大）
亜熱帯モード水
黒潮
Hasegawa et al. 2007

16. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

17. パプアニューギニア沖の沿岸湧昇と低海面水温
Coastal upwelling and realated cold temperature off PNG
岸 赤道
CTD観測点
28˚C
Before onset of 2002/03 El Nino： PNG沖沿岸湧昇・低海面水温が沿岸域に存在
岸に向かって浅くなる
Shallower near the coast
「かいよう」CTD観測表層水温断面図
CTD-observed upper-ocean temperature
80m
20m
R/V「かいよう」による海洋観測ライン
2001年12月２1日-23日 (KY0111航海)
同時期の衛星観測海面水温
沿岸湧昇海域の水温：
周辺海域より低温
Cold sea surface temperature
in upwelling region
沿岸湧昇の特徴を示す構造
Consistent to upwelling nature
緯度
深度(ｍ）
PNG
PNG
Hasegawa et al. 2008

18. OFES SST/海面流速パターン (2002/03エルニーニョ直前)
OFES-SST/surface current pattern bofore onset of 2002/93 El Nino
OFESのSST（カラー）と海面流速の
時間平均マップ
Hasegawa et al. 2011
ビスマルク海
Bismarck Sea
1999-2004年の
１月・１２月の５年間平均
(Long-term average)
沿岸湧昇期間 (PNG coastal upwelling period)
（２００１年１２月２０日 ２００２年１月２０日）の平均
南東向き流速
&
北西向き流速
北東向き流速
冷たい湧昇水を
赤道向きに輸送する可能性
Alongshore
沖
ニューギニア島
New Guinea
冷水域
周辺
湧昇期間の海洋表層熱収支解析：
ビスマルク海北部（西部南太平洋赤道域）の
海洋表層貯熱量の冷却の163%を南からの移流で
説明可能
モデル２５年間データ解析でも同様の結果
Hasegawa et al. 2010
Upwelled
cold water
can be
transported
to south part
of the equator
by the
northeastward
current

19. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

20. 太平洋表層の塩分変動
Upper-ocean salinity variability in the tropical Pacific
Upper ocean salinityHasegawa et al. 2012 revised Upper ocean temp.
塩分パターンと
水温パターンが異なる
Different spatial pattern
bet. sal. and temp.

21. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

22. 大気海洋領域モデル：
ニューギニア島の高山を除去して実験
(Model simulation: Removing high mountains in New Guinea)
4000-5000 m
Mountains
Remove the
Mountain (flatting topo)
Linkage bet. Upwelling, Wind, & Land

23. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Upper ocean salinity variability in 2000s
(f) Small scale interaction bet. Ocean, atmos. and land in WP
(g) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(h) Outreach activities (“New Year School”)

24. エルニーニョ後のインド洋広域昇温・
フィリピン海昇温・日本冷夏（北半球夏季）
Indian Ocean warming, Philippine Sea warming and anomalous
cold summer in Japan in the El Nino termina;on years
Strong El Nino： Clear rela;onship
過去の研究で指摘されたエルニーニョと
北インド洋・フィリピン海昇温のパターンと類似
（昇温：+0.6以上）
[El, IO warming, Gill, PS high&warming]
Weak El Nino: Weak and different behaivors
北インド洋・フィリピン海で昇温はしているが、値は
strong El Ninoと比較して小さい（+0.3℃以下）
Strong El Nino – weak El Nino
北インド洋・フィリピン海昇温のパターンが強調
（差：0.3℃以上）
Sea surface temperature composite maps

25. Others
(as a co‐author)
# Annual Rossby wave in EQ‐Pacific
(Ando and Hasegawa 2010)
# Indian Ocean upper ocean heat variability
(Konda et al. 2010)
# Intraseasonal Inidian Ocean mixed layer temperature
(Horii et al.: on‐going)
# MJO and mixed layer change in the Indian Ocean
(Seiki et al. : on‐going)
# El Nino events reproduced in various global warming
(Yasuda et al.: on‐going)
# Heat flux variability in the mid‐la;tudes
(Nagano et al.: on‐going)

26. 海洋・大気の格子化データ
全てに
TRITON/TAO ブイデータや船舶観測データ
が使われています！
（世界各国の天気予報にも使用）
TRITON/TAO buoy array data and ship‐observa;onal
data are used in the all of oceanic and atmospheric
gridded data,
as well as weather forecast
opra;ons in the world

27. (2) My Study
Past and on-going studies:
(a) El Nino cycle mechanism
(b) 10 yr (QD- scale) variability in the Pacific Ocean
(c) Multi-decadal air-sea interaction in mid-North Pacific
(d) Upwelling in Bismarck Sea and El Nino
(e) Small scale interaction bet. Ocean, atmos. and land in WP
(f) Linkage among Tropical Pacific, Indian Ocean,
Philippine Sea, and Japan
(g) Outreach activities (“New Year School”)

28. 第III期におけるスクール概要
（第10回NYS 2012年1月大阪大学）
１：通常レクチャー
各分野（固体地球マクロ・ミクロ、宇宙惑星、
生命圏、環境、大気海洋etc）の最新の動向に関する招待講演（各1時間）
２：Exレクチャー
科学と社会の接点、アウトリーチ、教育、科学メディアなどに関する招待講演（各30分）
３：グループワーク
参加者（＋講師）が10名程度のグループに分かれて、テーマ別に議論（約２時間）
４：懇親会
交流、ナイトセッション、ポスター発表

29. OUTLINE
(1) About Me
(2) My Study (briefly shown):
(3) SPICE-related observation during MR12-03

30. Warm pool
Eastward shia
El Nino
Weakened
Easterly wind
ただし、エルニーニョ・ラニーニャ経年振動に関しては１９８０年代以降に研究が進んだWarm pool variability affects/contribute：
*El Nino onset
* Typhoon/Tropical C.
* Anomalous weather/climate in Asia and global
* “Warming of Ocean”
* Interaction between Indian Ocean and Pacific
ETC.
熱帯研究の目標：
エルニーニョなどの気候変動機構の理解や変動予測精度の向上を通じて、
持続発展可能な社会の構築に寄与する
One of Main Targets:
Warm pool variability
Air-sea interaction evolution

31. Numerical model simulated volume transport (0-300m),
showing large values of coastal currents (NICU, etc.)
near PNG
ADCP moorings by France, USA
(2012-2014)
ADCP moorings by JAMSTEC
TRITON buoys maintained in R/V MIRAI
MR12-03 cruise
_
Papua New
Guinea
Sea surface temperature long-term average for January,
showing “warm water pool”
Whole purpose of the CLIVER-SPICE international project:
To understand oceanic circulation and coastal currents variability
in the tropical and subtropical region of the western South Pacific_
[10^6m^3/s]
# The two JAMSTEC-ADCP moorings are included in the CLIVER-SPICE moorings
near PNG with cooperation of France and USA SPICE-moorings:
SPICE国際プロジェクトの一環（係留系チーム：日・米・仏）
# JAMSTEC-ADCP moorings will observe current velocity, temperature and salinity of
New Ireland Coastal Undercurrent (NICU). 「2つの南半球西岸境界流の」の東側であるNICUを観測
Oceanic Observations off PNG in MR12-03
Coastal currents near PNG affect volume and thermal
variation of “warm water pool”, which also affects rainfall
change in PNG and many countries in the western Pacific
region, and also affects onset of El Nino event that
induces weather and climate changes in the world. To
observe coastal currents near PNG is very important for
deeper understanding of oceanic and atmospheric
changes near PNG and also at global scale.
_
High temperature
 strong rainfall
Eastward shit of
warm water pool
 onset of El Nino
equatorial and global
weather/climate change

32. # Numerical model simula;on
current velocity (161‐241m average)
JAMSTEC’s
moorings
cm/sec
cm/sec
NICU
SICU
NGCU
NBCU
NGCU
EUC
NICU: New Ireland Coastal Undercurrent
SICU: Solomon Islands Coastal Undercurrent
NBCU: New Britain Coastal Undercurrent
NGCU: New Guinea Coastal Undercurrent
EUC: Equatorial Undercurrent
PNG沖中層ADCP設置ポイント
Deployment points of the subsurface ADCP moorings of PNG
NICU
There are various coastal currents
near PNG. They are important for
warm water transport to warm pool.
# NICU: 暖水プール変動に寄与
NICU is one of the currents
that have not been well observed.
NICU variability is not well
Understood at present.
# NICUをターゲット（世界初の本格観測）
Mooring period:
From August 2012,
for roughly 1.5 years

33. PNG沖中層ADCP係留系(2.6S & 2.8S)デザイン概要
Design for subsurface ADCP moorings off PNG (2.6S & 2.8S)
Sea surface
CTD sensor (605-685m depth)
Anchor
Releaser (double)
~3500 m depth
Upward ADCP sensor (600-680m depth)
Top float (260-400m depth)
with upward ADCP (current velocity) &
CTD (temperature and salinity) sensors
~
~
Current velocity
observed by ADCP
(50m~650m)
NICU
Two moorings
for NICU
Sea bottom
NICU
200m
Counter current newly found
in MR10-07

34. アルゴフロート投入
Argo float launching
# PNG-Argo-float observes temperature, salinity from roughly 650m to surface.
# One Argo float will be launched near ADCP-mooring point during MR12-03 cruise.
# Special version for PNG-Argo-Float
(hardware is same, but control software is newly made)
PNG沖特別仕様（ミッションパラメータ変更・制御ソフト開発）
Observation cycle: 1 day
Communication via Iridium (Float mission can be changed via email after launching)
Parking depth etc. can be changed after lunching
Some parameters are changed automatically by the software
Argo float
launching
area
Expected
area of Argo
float drifting
Intended
cruise track

35. XCTD/SADCP/MBES/LADCP/CTD 観測
XCTD/SADCP/MBES/LADCP/CTD observa;on along track

36. Two subsurface ADCP moorings off New Ireland Island, observing current velocity
from 50m to 650m, temperature and salinity at nearly 300m and 650m.
(Cooperation with CLIVAR-SPICE mooring project)
In addition, Argo floats (temperature and salinity) will be launched near mooring point.
Also, along cruise track, temperature and salinity will be observed by CTD and
XCTD (0-1000m), and current velocity will be observed by SADCP and LADCP.
Bottom topography is explored by MBES for future mooring deployment.
These observations will contribute to deeper understanding of mechanism of
warm water supply to warm pool through NICU, which can be related to weather
and climate changes in PNG and other many countries.
Summary for subsurface ADCP and related observations near PNG
エルニーニョ発生や異常気象を引き起こす暖水プールの体積・水温・塩分の変動について、
南半球 (NICU）からの寄与を解明

37. END