What is represented by the the colour range in this map?

water temperature
sea currents speed
water salinity
sea depth
Launched June 10, 2011, Aquarius is NASA’s first satellite instrument specifically designed to study the salt content of ocean surface waters. The complete first year dataset of NASA's Aquarius instrument reveals seasonal changes in the Amazon River's plume. Depending on the prevailing currents, the river's freshwater outflow heads east toward Africa or bends up north to the Caribbean.
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Answers by country

water temperature
sea currents speed
water salinity
sea depth
answers
flagRepublic of Ireland
28%
14%
57%
0%
14
flagItaly
23%
6%
50%
13%
30
flagAustria
41%
8%
45%
4%
24
flagGreece
27%
24%
41%
6%
29
flagPakistan
23%
7%
38%
30%
13
flagRussia
45%
4%
37%
12%
24
flagIndia
24%
23%
36%
11%
117
flagUkraine
30%
13%
33%
19%
164
flagAustralia
55%
2%
31%
7%
38
flagPoland
37%
14%
30%
16%
14303
flagthe United States
48%
9%
26%
13%
325
flagGermany
45%
14%
23%
14%
166
flagthe United Kingdom
43%
14%
23%
17%
140
flagUnknown
50%
9%
22%
18%
22
flagCanada
58%
16%
20%
4%
24
flagthe Netherlands
63%
18%
18%
0%
11
flagSwitzerland
27%
18%
18%
36%
11