### A F



### G N 

### E
B P 

### D L

I H K F
G G O J F

C F

M I F 

### E Q Q

R 

### R S S S 

### S T U V

W

X 

### X Y 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 

## 1 4 1 4

1 6 1 9  ́ 

## 1 7

U / I I C E E D G E



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 2 4 O c t 2 0 0 8 D a t a S o u r c e s D a t e R A D A R S A T . . . . . . . . . . . 2 4 O c t E N V I S A T / G M M . . . 2 3

- 2 4 O c t A n a l y s t s : P a c h e c o V e g a , C h r i s t i a n A G 3 S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 2

1 X B 3 1 2 3 1 3 X C 3

1 X

D 5 3 2 3 1 3 X E 6 2 4 3 1 3 X F 6 3 3 3 1 3 X

G 7 3 4 3 1 3 X H 7 4 3 3 1 3 X I 7 5 2 3 1 3 X

J 7 - 9 3 5 3 1 K 7 - 9 5 3 3 1 L 7 - 9 7 1 3 1

M 8 2 6 3 1 3 X N 8 4 4 3 1 3 X O 8 5 3 3 1 3 X

P 8 6 2 3 1 3 X Q 8 - 1 0 7 2 3 1 R 9 4 5 3 1 3 X

S 9 6 3 3 1 3 X T 9 7 2 3 1 3 X U 9 + 1 6 2 7 3 1

V 9 + 3 1 5 8 ● 7 3 W 9 + 6 3 3 1 3 X X 9 + 8 1 3 1 3 X

Y 9 + 8 1 3 1

### I F 

### A A B B

C C

C D

D 

### E

F G



### H H I J



### J K

K

K K 

### K L

L M 

### N O P



### Q R

R S 

### T

U I C

E E D

G

E 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 

## 1 6 1 4

2 0 2 1 1 0 1 7 1 0  ́ 

#  ́  ́



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 2 7
- 3 1 O c t 2 0 0 8 D a t a S o u r c e s D a t e R A D A R S A T . . . . . . 2 5
- 2 7 O c t E N V I S A T / G M M . . . 2 6

- 2 7 O c t Q U I K S C A T . . . . . . . . . . . 2 6 O c t A n a l y s t s : M i l l e r , J o s h M S T 1 S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 3 1 2 3 1 3 X B 5 2 3 3 1 3 X C 6 3 3 3 1 3 X

D 7 3 4 3 1 3 X E 7 4 3 3 1 3 X F 8 3 5 3 1 2 X

G 8 3 5 3 1 3 X H 8 5 3 3 1 3 X I 8 6 2 3 1 3 X

J 9 3 6 3 1 3 X K 9 6 3 3 1 3 X L 9 7 2 3 1 3 X

M 9 8 1 3 1 3 X N 9 + 1 5 3 7 3 1 O 9 + 1 6 2 7 3 1

P 9 + 3 1 5 8 ● 7 3 Q 9 + 5 4 3 1 R 9 + 6 3 3 1

S 9 + 7 2 3 1 T 9 + 8 1 3 1 U 1 0 8 2 3 1 3 X

### J A T

U W

X Y



### Z B B A

A
L Q

I

D D L

S D D D D D D R
D

H K E N

D D
C C C C P M C D D B G V

F O

Q
S I F

J 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 

### I c

e E d



### g

e



## 3 6

3 2 3 2 2 5  ́ 

#  ́
 ́  ́  ́ 

## 1 3 3 3

1 7 4 9
3 1  ́ 

## 7



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 1 0
- 1 4 N o v 2 0 0 8 D a t a S o u r c e s D a t e E N V I S A T / G M M . . . . . . . . 1 0 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 0 - 1

1 B 2

1 X C 2 - 4 1 2 3 1

D 4 2 2 3 1 3 X E 4

1 X F 5 2 3 3 1 3 X

G 5

1 X H 6 4 2 3 1 3 X I 7 2 5 3 1 3 X

J 7 4 3 3 1 3 X K 7 6 1 3 1 3 X L 7

1 X

M 7 - 9 4 4 3 1 N 8 2 6 3 1 3 X O 8 6 2 3 1 3 X

P 8 - 1 0 5 4 3 1 Q 9 5 4 3 1 3 X R 9 8 1 3 1 3 X

S 9

1 X T 9 + 1 7 1 7 3 1 U 9 + 2 1 6 8 ● 7 3

V 9 + 3 5 1 7 3 1 W 9 + 3 3 3 8 ● 7 3 X 9 + 4 5 3 1 3 X

Y 9 + 6 3 3 1 3 X Z 9 + 7 2 3 1 3 X A A 9 + 8 1 3 1 3 X B B 9 +

3 3 C C 1 0 8 2 3 1 3 X D D 1 0

3 8

### G J

K M N



### P

R S V

X O

U L

E T

B
G D D X F

Q

C W W B 

### A I

H

E I F

B B

X X

X X 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 

### I 

### c e E d

g

e



## 4 0

3 4 2 7

3 4

1 8  ́ 

#  ́

 ́  ́

 ́ 

##  ́ 

## 3 2 1 0

2 0

5 7 5 1



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 1 4 N o v 2 0 0 8 D a t a S o u r c e s D a t e E N V I S A T / G M M . . . 1 3

- 1 4 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 1 - 3 1 1 3 1 B 2

1 X C 3 - 5 3 1 3 1

D 4

1 X E 5 3 2 3 1 3 X F 7 4 3 3 1 3 X

G 7

1 X H 8 4 4 3 1 3 X I 8 6 2 3 1 3 X

J 8 7 1 3 1 3 X K 8

1 X L 9 + 1 7 1 7 3 1

M 9 + 2 1 6 8 ● 7 3 N 9 + 3 5 1 7 3 1 O 9 + 3 3 3 8 ● 7 3

P 9 + 5 4 3 1 3 X Q 9 + 6 3 3 1 3 X R 9 + 6 3 3 1

S 9 + 7 2 3 1 3 X T 9 + 8 1 3 1 3 X U 9 + 8 1 3 1

V 9 +

3 3 W 1 0 8 2 3 1 3 X X 1 0

3 8

### A

C

I F I F

I E

D F G 

### J O

B
H E

K K

H M N L

J Q R

T U

V 

### W Y 

### X

V P S

Y Y

Y

Y Y Z Z

A

A 

### A

A

A A 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 

### I c

e E d g e 

## 3 1 4 7

3 9
3 7
2 2  ́  ́

 ́  ́  ́  ́ 

## 2 1 4 2

3 5 4 9

2 0 4 1



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 1 7
- 2 1 N o v 2 0 0 8 D a t a S o u r c e s D a t e R A D A R S A T . . . . . . . . . . . 1 8 N o v O L S . . . . . . . . . . . . . . . . 1 7 N o v E N V I S A T / G M M . . . 1 6

- 1 7 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 0 - 1

1 B 2 1 1 3 1 3 X C 3

1 X

D 3 - 5 1 3 3 1 E 4 3 1 3 1 3 X F 5 2 3 3 1 3 X

G 6 2 4 3 1 3 X H 6 4 2 3 1 3 X I 7 1 6 3 1 3 X

J 7 5 2 3 1 3 X K 8 2 6 3 1 3 X L 8 3 5 3 1 3 X

M 8 5 3 3 1 3 X N 9 5 4 3 1 3 X O 9 + 2 7 7 3

P 9 + 2 1 6 9 ● 7 3 5 3 3 Q 9 + 3 4 2 8 ● 7 3 R 9 + 4 5 7 3

S 9 + 4 1 4 9 ● 7 3 5 3 3 T 9 + 5 4 3 1 3 X U 9 + 7 2 3 1 3 X

V 9 + 7 2 3 1 W 9 + 8 1 3 1 3 X X 9 +

3

Y 1 0 1 9 7 3

8 Z 1 0 7 3 9 8 ● 5 5 A A 1 0

3 8I F

A A

B C

C D

D E

E

F F

G G

G H I J K

L M N

O P

Q

Q Q

Q

Q Q

Q Q

Q

Q R

S S

S 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N  ́

 ́  ́



### 3 5

1 7 1 7 1 7 4 1

5 6 2 4 I C E E D G

E A 1 - 3 1 1 3 1 3 X B 1 - 3 1 1 3 1

C 3 - 5 3 1 3 1 3 X D 5 - 7 3 3 3 1 3 X

E 5 - 7

1 X F 7 - 9 4 4 3 1 3 X

G 7 - 9 5 3 3 1 3 X H 7 - 9 5 3 3 1

I 9 + 2 6 1 7 3 1 3 3 X J 9 + 2 7 7 3

K 9 + 2 4 3 9 ● 7 3 L 9 + 3 6 3 1 3 X

M 9 + 4 5 3 1 3 X N 9 + 4 5 7 3

O 9 + 6 3 3 1 3 X P 9 + 7 2 3 1 3 X
Q 9 + 8 1 3 1 3 X R 9 +

3 S 1 0

3 8



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 0 4 N o v 2 0 1 0 D a t a S o u r c e s D a t e R

A D A R S A T . . . . . . . . . . . 0 4 N o v A L O S . . . . . . . . . . . . . . . 0 4 N o v E N V I S A T / G M M . . . . . . . . 0 4 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E EI

K L

J G

B

L K

C K H A K M A D M

L G C

K F
G

C G

E I F C 

### N O

P

Q 

### R

S

S

T T

T U

U

V W

X X X

X X X

X X

X X X 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N I C E E D G E



## 4 1 2 1

2 0

2 0  ́

 ́  ́

 ́ 2 1

1 8 5 2

3 6



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 0 8
- 1 2 N o v 2 0 1 0 D a t a S o u r c e s D a t e R A D A R S A T . . . . . . . . . . . 0 8 N o v O L S . . . . . . . . . . . . . . . . 0 8 N o v E N V I S A T / G M M . . . . . . . . 0 8 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 1 - 3 1 1 3 1 3 X B 3 - 5 1 3 3 1 3 X

C 3 - 5 3 1 3 1 3 X D 3 - 5 3 1 3 1

E 3 - 5

1 X F 5 - 7 3 3 3 1 3 X

G 5 - 7 4 2 3 1 3 X H 7 - 9 1 7 3 1 3 X

I 7 - 9 1 7 7 3 3 3 J 7 - 9 3 5 3 1 3 X

K 7 - 9 5 3 3 1 3 X L 7 - 9 6 2 3 1 3 X

M 7 - 9 6 2 3 1 N 9 + 1 6 2 9 ● 7 3

O 9 + 2 4 3 9 ● 7 3 P 9 + 3 6 7 3

Q 9 + 5 4 3 1 3 X R 9 + 5 4 7 3 S 9 + 6 3 3 1 T 9 + 7 2 3 1 3 X U 9 +

3 3 V 1 0 1 9 7 3

8 W 1 0 2 8 7 3

8 X 1 0

3 8H E J L

I T

S S

R I

A

W
Q

W E F A A D

B

H C

W W H A H W W U W
V P M N

K O

W

B

I F

W G

F E
Q A I C

E E D G E 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N 2 2 4 4

2 2 2 3  ́

 ́ 

#  ́  ́ 1 5

1 5 5 2

3 1



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 1 1 N o v 2 0 1 0 D a t a S o u r c e s D a t e R A D A R S A T . . . . . . . . . . . 1 0 N o v E N V I S A T / G M M . . . . . . . . 1 0 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 1 - 3 1 1 3 1 3 X B 3 - 5 3 1 3 1 3 X

C 3 - 5

1 X D 5 - 7 2 4 3 1 3 X

E 5 - 7 4 2 3 1 3 X F 5 - 7

1 X

G 7 - 9 3 5 3 1 3 X H 7 - 9 5 3 3 1 3 X

I 7 - 9 6 2 3 1 3 X J 7 - 9 6 2 3 1

K 7 - 9

3 3 L 9 + 1 8 7 3 3 3

M 9 + 1 6 2 9 ● 7 3 N 9 + 2 4 3 9 ● 7 3

O 9 + 3 6 7 3 P 9 + 5 4 7 3

Q 9 + 6 3 3 1 3 X R 9 + 6 3 3 1 S 9 + 7 2 3 1 3 X T 9 +

3 3 U 1 0 1 9 7 3

8 V 1 0 2 8 7 3

8 W 1 0

3 8A C D

E F

G H

I I I M N

Q Q R T

T T T

T T T T

T

T V

T U

S O L

J D I C I G K

B

T D P

O

I F C C 1 4 5 ° W 1 5 0 ° W 1 5 5 ° W

1 6 0 ° W 1 6 0 ° W

1 6 5 ° W 1 6 5 ° W

1 7 0 ° W 1 7 0 ° W

1 7 5 ° W 1 7 5 ° W

1 8 0 ° 1 8 0 ° 1 7 5 ° E 1 7 0 ° E75°N75°N70°N70°N65°N65°N  ́

 ́  ́
 ́

 ́ 

## 5 0

2 8 2 7 2 7 1 8

0 9 2 2

3 0

1 4 I C E E D G E



## C O L O R C O D E S B A S E D O N T O T A L C O N C E N T R A T I O N

1
- 3 T E N T H S L E S S T H E N

1 T E N T H I C E F R E E

9

- 1 0 T E N T H S 7
- 8 T E N T H S 4
- 6 T E N T H S

U N D E F I N E D I C E I C E S H E L F F A S T I C E ( T E N T E N T H S ) 

# I C E A N A L Y S I S C h u k c h i S e a N A T I O N A L / N A V

A L I C E C E N T E R A n a l y s i s W e e k 1 5
- 1 9 N o v 2 0 1 0 D a t a S o u r c e s D a t e A L O S . . . . . . . . . . . . . . . 1 4 N o v R A D A R S A T . . . . . . . . . . . 1 5 N o v E N V I S A T . . . . . . . . . . . . 1 5 N o v A n a l y s t s : S z o r c , C h r i s ( N A V Y C I V ) U N C L A S S I F I E D C M = T H E O R E T I C A L I C E T H I C K N E S S I N C E N T I M E T E R S ́ 

## N M = 1 6 8 H R A N A L D R I F T V E C T O R S I N N A U T I C A L M I L E S 

## I F = I C E F R E E A 1 - 3

1 X B 3 - 5 2 2 3 1 3 X

C 3 - 5 3 1 3 1 3 X D 3 - 5

1 X

E 3 - 5

1 F 5 - 7 1 5 3 1 3 X

G 5 - 7 3 3 3 1 3 X H 5 - 7

1 X

I 7 - 9 6 2 3 1 3 X J 7 - 9

1 X

K 9 + 1 8 7 3 3 3 L 9 + 1 7 1 9 ● 7 3

M 9 + 2 7 7 3 3 3 N 9 + 2 5 2 9 ● 7 3

O 9 + 4 5 7 3 3 3 P 9 + 6 3 7 3

Q 9 + 7 2 3 1 3 X R 9 + 7 2 3 1 S 9 + 8 1 3 1 3 X T 1 0 1 9 7 3

8 U 1 0 2 8 7 3

8 V 1 0 3 7 7 3

8

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# ICE CHART SYMBOLOGY The World Meteorology Organization (WMO) system for sea ice symbology is more frequently referred to as the "Egg Code" due to the oval shape of the symbol.



# S o 

# S d C t 

# - Total concentration of ice in area, reported in tenths. May be expressed as a single number or as a range, not to exceed two tenths (3-5, 5-7 etc.) C a 

# C b 

# C c 

# - Partial concentration (C a 

# , C b 

# , C c 

# ) are reported in tenths, as a single digit. These are reported in order of decreasing thickness. C a 

# is the concentration of the thickest ice and C c 

# is the concentration of the thinnest ice. S a 

# S b 

# S c 

# - Stages of development (S a 

# , S b 

# , S c 

# ) are listed using the code shown in Table 1 below, in decreasing order of thickness. (NOTE: If there is a dot (.), all stages of development codes to the left of the dot (.) are assumed to carry the dot (.)) These codes correspond directly with the partial concentrations above. C a 

# is the concentration of stage S a 

# , C b 

# is the concentration of stage S b 

# , and C c 

# is the concen tration of S c 

# . S o 

# S d 

# - Development stage (age) of remaining ice types. S o 

# if reported is a trace of ice type thicker/older than S a 

# . S d 

# is a thinner ice type which is reported when there are four or more ice thickness types. F a 

# F b 

# F c 

# - Predominant form of ice (floe size) corresponding to S a 

# , S b 

# and S c 

# respectively. Table 2 below shows the codes used to express this information. Pa g e 1 of 3 The E gg Code

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# Table 1. Egg Codes for Stag es of Ice Development (S x 

# Codes) Stage of Development for Sea Ice Code Figure Stage of Development for Fresh Water Ice New Ice-Frazil, Grease, Slush, Shuga (0-10 cm) 1 New Ice (0 - 5 cm) Nilas, Ice Rind (0 - 10 cm) 2 Young (10 - 30 cm) 3 Gray (10 - 15 cm) 4 Thin Ice (5 - 15 cm) Gray - White (15 - 30 cm) 5 Medium Ice (15 - 30 cm) First Year (30 - 200 cm) 6 First Year Thin (30 - 70 cm) 7 Thick Ice (30 - 70 cm) First Year Thin - Fi rst Stage (30 - 70 cm) 8 First Stage Thick Ice (30 - 50 cm) First Year Thin - S econd Stage (30 - 70 cm) 9 Second Stage Thick Ice (50 - 70 cm) Medium First Year (70 - 120 cm) 1. Very Thick Ice (70 - 120 cm) Thick First Year (>120 cm) 4. Old - Survived at least one season's melt (>2 m) 7. Second Year (>2 m) 8. Multi-Year (>2 m) 9. Ice of Land Origin Table 2. Egg Codes for Forms of Ice (F x 

# Codes) Forms of Sea Ice Code Figure Forms of Fresh Water Ice ~F Belts and Strips symbol followed by ice concentration New Ice (0-10 cm) X Pancake Ice (30 cm - 3 m) 0 Brash Ice (< 2m) 1 Ice Cake (3 - 20 m) 2 Small Ice Floe (20 - 100 m) 3 Medium Ice Floe (100 - 500 m) 4 Big Ice Floe (500 m - 2 km) 5 Vast Ice Floe (2 - 10 km) 6 Giant Ice Floe (> 10 km) 7 Fast Ice 8 Fast Ice Pa g e 2 of 3 The E gg Code

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# If you have any comments or suggestions, please E-mail the National Ice Center Public Affairs Officer

. Home Page | FOIA | Disclaimer | Privacy Act | Frequently Asked Questions Customer Feedback | Director/CO Biography | Directions to the NIC | Contact Us Ice of Land Origin 9 Undetermined or Unknown (Iceberg, Growlers, Bergy Bits) / Pa g e 3 of 3 The E gg Code

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