Shelf seas definitions

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J N U S C C M A R B V U F O X H L E S S U
C G C R I T I C A L D E P T H U A C R W F
R D B B O M L F U G X V X X U R N O N Q S
P V D U E B C R J W A H Q W D S G L N T C
F N P T D E O U C M M J D A Y N M O Q K J
B X E W F C M S L Q P G V C K L U G X W I
W U I X E C P T L K P N A B B S I I N P H
T F U E P V E U B X J O T I G S R C O I N
A D X N L C N L U L I T Y O J X V A T U I
W S M O O I S E Y R H K V U X N O L K I I
C D M Z S O A F U F J N K K R M R E N W S
B S I S U A T L C J M A T T G N T F A T B
A X U I R W I F A K U L H T W D I F L N D
M C Y T P Q O R M A R P B I S Y C I P J J
K H N I M T N W K C E O D G J P E C O M X
M Y K R B I D F Y M P R E N H U S I L A G
N P E U A C E J C W A E X M P R M E O N E
I T R E X F P G G R W M A Y S C I N H F Y
C V D N D P T R D X S N A B H O H C E E O
B Y W I O L H W X J T Q D I T M W Y E F W
U F B T Q I C L L A C J L E Q K N H Q A J

Clues

  • areas above the continental shelf drop-off (often around 200m) (8, 4)
  • circulation consisting of a series of shallow, slow, counter-rotating vortices at the ocean's surface aligned with the wind. These circulations are developed when wind blows steadily over the sea surface. (8, 8)
  • depth where no photosynthesis occurs (8, 5)
  • depth where rate of photosynthesis matches rate of respiration (lower boundary of euphoric zone) (12, 5)
  • energy transferred between trophic levels (10, 10)
  • permanent plankton (12)
  • plankton skeleton (8)
  • temporary plankton (12)

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