Water Transparency (Diffuse attenuation coefficient at 490nm, Kd490 in m^-1 at 4km resolution): The diffuse attenuation coefficient Kd490 measures the light penetration in the water column at the blue-green wavelengths (ca. 490 nm). It represents a good indicator of water transparency resulting from the combined action of absorption and backscattering by the water constituents, and the structure of the surrounding light field.
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- Syria, Jordan, Montenegro, Austria, Gibraltar, Lebanon, Saudi Arabia, Malta, Former Yugoslav Republic of Macedonia, Guinea-Bissau, Togo, Sierra Leone, Sudan, Niger, Burkina Faso, Sweden, Monaco, Cyprus, Latvia, Guernsey, Benin, Liechtenstein, Nigeria, Mauritania, Somalia, Poland, Belarus, Faroe Islands, Netherlands, Lithuania, Côte d’Ivoire, Tunisia, San Marino, Senegal, Vatican City, South Sudan, Moldova, Central African Republic, Romania, Egypt, Denmark, Chad, Morocco, Albania, Slovenia, Cape Verde, Western Sahara, Cameroon, Serbia, Switzerland, Greece, France, Ethiopia, Guinea, Kosovo, Croatia, Spain, Czech Republic, Germany, Italy, Bulgaria, United Kingdom, Hungary, Greenland, Slovakia, Finland, Belgium, Luxembourg, Åland Islands, Iraq, Isle of Man, Andorra, Libya, Ukraine, Turkey, Eritrea, Georgia, Estonia, Ghana, Israel, Gambia, Algeria, Iceland, Ireland, Palestinian territory, Bosnia and Herzegovina, Mali, Jersey, Norway, Portugal, Russia, Djibouti