Compare of UV radiation and CDOM in the Chukchi Sea and East Siberian, Arctic

Abstract

We investigated the penetration of solar radiation on the Chukchi Sea and East Siberian, Arctic from 6 to 19 August 2016 using IBRV ARAON. We measured the intensity of UV radiation, CDOM and UV-absorbing compounds (Mycosporine-like amino acids) in the 14 stations. The penetration depth (Z: 1%) of UV-B, UV-A, and PAR on the middle Chukchi Sea relatively deeper than East Siberian stations. The CDOM concentration on East Siberian was relatively higher than middle Chukchi Sea due to influenced organic matter by river off or melting water of permanence frozen zone from East Siberia. Especially, the penetration depth of UV-B showed the average around 5 m at East Siberian and around 15 m at middle Chukchi Sea. Also the CDOM concentration on the Siberian presented higher 0.02 m-1 than middle Chukchi Sea (0.01 M-1). The CDOM was affected the transmission of UV-B radiation to compare of UVA and PAR. We suggest that global warming accelerated the melt of permanence frozen zone in the Siberia to supply the CDOM concentration in the sea water. According CDOM protected the penetration of UV-B on the sea water

the limited UV transmission influenced the phytoplankton community and primary production.