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
23%
13%
63%
0%
30
flagNigeria
21%
7%
57%
14%
14
flagFrance
15%
7%
53%
15%
13
flagGreece
29%
20%
44%
5%
34
flagItaly
25%
9%
43%
18%
44
flagAustralia
42%
2%
42%
8%
49
flagAustria
31%
19%
38%
9%
73
flagRussia
40%
4%
38%
14%
49
flagSpain
38%
15%
38%
7%
13
flagPakistan
26%
5%
36%
31%
19
flagIndia
24%
23%
34%
15%
153
flagUkraine
36%
11%
32%
15%
238
flagPoland
36%
14%
31%
15%
15629
flagthe United States
45%
8%
31%
13%
426
flagGermany
41%
14%
26%
12%
456
flagCanada
53%
13%
26%
6%
30
flagthe United Kingdom
44%
12%
25%
16%
201
flagUnknown
50%
9%
22%
18%
22
flagthe Netherlands
64%
11%
17%
5%
17
flagSwitzerland
36%
18%
15%
30%
33