By A. Dahlback (auth.), Prof. Dr. Dag O. Hessen (eds.)

Although there are a few organic strategies which are supported by way of UV radiation, so much organisms are under pressure via it in quite a few methods, e.g. via DNA damage.
Top foreign specialists current an built-in review of UV radiation and its results on terrestrial, freshwater and marine Arctic biota. elevated stratospheric ozone depletion and the corresponding elevate in flooring degrees of UV radiation in addition to ambient, "natural" UV radiation as a key ecological consider the Arctic spring and summer season are mentioned intimately. also, uncomplicated info on Arctic ecosystems is given. the amount presents not just an outstanding account of present-day wisdom of the topic, but additionally describes the cutting-edge on which destiny study could be built.

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Aas, J. K. Højerslev, R. Sandvik, and E. 1 Introduction The Arctic can be delimited by the Arctic Circle at 66 ° 32 'N, which is the southern boundary of the midnight sun. For many purposes, however, it will be more meaningful to base the limits of the Arctic on climate, vegetation, or seawater characteristics (Murray 1998). In this chapter, we have chosen to define Arctic marine waters as the sea within the region delineated by the Arctic Monitoring and Assessment Programme (AMAP). The boundaries of this region are a compromise between major oceanographic features, permafrost limits, vegetation boundaries, and political boundaries (Murray 1998).

20). Z(310, 10 %) is calculated by Eq. 21). Z(310, 10 %) is calculated by Eq. 15). 5.

61 Southern Balticb Bay water Coastal water Open-seawater Salinity Mean Min. 1. Regional distribution of the spectral slope g of yellow substance 30 E. Aas et al. Spectral Properties and UV-Attenuation in Arctic Marine Waters 31 absorption spectrum of yellow substance cannot be predicted with satisfactory accuracy unless the local mean value of the slope g is known. Yellow substance (CDOM) constitutes a part of the dissolved organic matter (DOM) or dissolved organic carbon (DOC), but unfortunately there is no constant ratio between ay(l) and DOC.

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