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
26%
10%
63%
0%
19
flagItaly
27%
6%
48%
12%
33
flagAustria
38%
11%
46%
3%
26
flagAustralia
46%
2%
42%
6%
45
flagGreece
30%
23%
40%
6%
30
flagIndia
24%
23%
37%
12%
121
flagRussia
42%
7%
35%
14%
28
flagUkraine
31%
12%
34%
18%
182
flagPakistan
33%
6%
33%
26%
15
flagPoland
37%
14%
30%
16%
14591
flagGermany
41%
16%
27%
12%
210
flagthe United States
47%
9%
26%
14%
341
flagthe United Kingdom
44%
13%
25%
16%
160
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