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
25%
7%
50%
10%
28
flagGreece
22%
31%
45%
0%
22
flagAustria
50%
6%
43%
0%
16
flagIndia
26%
22%
37%
13%
99
flagPakistan
27%
9%
36%
27%
11
flagRussia
45%
5%
35%
15%
20
flagUkraine
31%
13%
31%
18%
113
flagPoland
37%
14%
29%
16%
13734
flagthe United States
49%
9%
24%
14%
295
flagthe United Kingdom
42%
13%
23%
18%
119
flagGermany
49%
11%
22%
15%
114
flagUnknown
50%
9%
22%
18%
22
flagthe Netherlands
70%
10%
20%
0%
10
flagAustralia
64%
3%
17%
10%
28
flagCanada
66%
14%
14%
4%
21