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PC23A
age (ka)
grain size ( m)
0
60
40
10
20
1 10 1000.10.01 1000 10000
30
50
grain size ( m)
UMK-3A
age (ka)
0
60
40
10
20
1 10 1000.10.01 1000 10000
30
50
grain size ( m)
BOW-9A
age (ka)
0
60
40
10
20
1 10 1000.10.01 1000 10000
30
50
GRIP
18O ( )
0
60
40
10
20
-36 -38 -40-34-32 -42 -44
50
grain size ( m)
UMK-3A
0
60
40
10
20
1 10 1000.10.01 1000 10000
50
grain size ( m)
BOW-9A
0
60
40
10
20
1 10 1000.10.01 1000 10000
30
50
2020
6060
MIS1
MIS2
MIS3
MIS4タイプ１砂サイズ
のピークがある
タイプ２砂サイズ
のピークがない
・・・ タイプ１タイプ
・・・タイプ・・・タイプ１・・・タイプ
季節的海氷域（冬：海氷がある／夏：海氷がない）北部域で海水が凍結を始め徐々に拡大していく
IRD
BOW-9A
UMK-3A
PC23A
GRIP
10 20 30 40 50 60 700
0.5
1
1.5
2
2.5
0.5
1
1.5
2
2.5
0.5
1
1.5
2
2.5
-44
-42
-40
-38
-36
-34
-32
O (
) IRD
()
(smoothed/vol_calib)
IRD ()
(smoothed)
IRD ()
(smoothed)
18
・・・・・・・・・
PC23A
PC23A
PC23A
IRD
Sakamoto 2007Sakamoto 2007
BOW-9A
UMK-3A
depth (m)
-44
-42
-40
-38
-36
-34
-32
18O ()
CaO (ms%)
4 8 12 16
2 4 60 8
2 4 6 8 10 12
CaO (ms%)
CaO (ms%)
15
10
5
25
20
15
10
5
25
20
15
10
5
age (ka)40 60 7010 5030200
PC23A
GRIP
4
4
16
12
MIS2 MIS4170°E 180° 170°W
50°N
55°N
60°N
UMK-3ABOW-9A
PC23A
170°E 180° 170°W
50°N
55°N
60°N
UMK-3ABOW-9A
PC23A
depth (m)
age (ka)
depth (m)
age (ka)