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
flagItaly
24%
8%
52%
8%
25
flagAustria
50%
10%
40%
0%
10
flagGreece
27%
33%
38%
0%
18
flagIndia
26%
24%
37%
10%
87
flagRussia
46%
6%
33%
13%
15
flagPoland
37%
14%
29%
16%
13313
flagUkraine
32%
14%
29%
19%
99
flagGermany
43%
11%
29%
14%
62
flagthe United Kingdom
42%
14%
24%
16%
107
flagthe United States
50%
9%
22%
15%
270
flagUnknown
50%
9%
22%
18%
22
flagCanada
65%
15%
15%
5%
20
flagAustralia
83%
0%
5%
5%
18