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
31%
12%
56%
0%
16
flagItaly
25%
6%
50%
12%
32
flagAustria
40%
12%
44%
4%
25
flagGreece
27%
24%
41%
6%
29
flagAustralia
48%
2%
39%
6%
43
flagIndia
24%
23%
36%
11%
117
flagRussia
48%
4%
36%
12%
25
flagPakistan
28%
7%
35%
28%
14
flagUkraine
31%
12%
33%
18%
170
flagPoland
37%
14%
30%
16%
14438
flagthe United States
48%
9%
26%
14%
333
flagGermany
42%
14%
26%
14%
189
flagthe United Kingdom
43%
13%
25%
16%
158
flagUnknown
50%
9%
22%
18%
22
flagCanada
58%
16%
20%
4%
24
flagSwitzerland
25%
16%
16%
41%
12
flagthe Netherlands
66%
16%
16%
0%
12