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
20%
8%
70%
0%
24
flagItaly
27%
8%
44%
13%
36
flagAustria
37%
15%
43%
3%
32
flagAustralia
46%
2%
42%
6%
45
flagGreece
29%
22%
41%
6%
31
flagIndia
24%
23%
36%
13%
126
flagRussia
41%
6%
34%
17%
29
flagUkraine
33%
11%
33%
17%
193
flagPakistan
33%
6%
33%
26%
15
flagPoland
37%
14%
30%
16%
14763
flagthe United States
46%
9%
27%
14%
356
flagGermany
41%
16%
27%
12%
230
flagthe United Kingdom
44%
13%
24%
16%
166
flagUnknown
50%
9%
22%
18%
22
flagCanada
58%
16%
20%
4%
24
flagSwitzerland
23%
23%
15%
38%
13
flagthe Netherlands
71%
14%
14%
0%
14