Effects of sea ice cover on satellite-detected primary production in the Arctic Ocean

TitleEffects of sea ice cover on satellite-detected primary production in the Arctic Ocean
Publication TypeJournal Article
Year of Publication2016
AuthorsKahru M, Lee Z.P, Mitchell B.G, Nevison C.D
JournalBiology Letters
Volume12
Date Published2016/11
Type of ArticleArticle
ISBN Number1744-9561
Accession NumberWOS:000389637100002
Keywordsglobal change; ocean colour; primary production; sea ice
Abstract

The influence of decreasing Arctic sea ice on net primary production (NPP) in the Arctic Ocean has been considered in multiple publications but is not well constrained owing to the potentially large errors in satellite algorithms. In particular, the Arctic Ocean is rich in coloured dissolved organic matter (CDOM) that interferes in the detection of chlorophyll a concentration of the standard algorithm, which is the primary input to NPP models. We used the quasianalytic algorithm (Lee et al. 2002 Appl. Opti. 41, 575525772. (doi: 10.1364/AO.41.005755)) that separates absorption by phytoplankton from absorption by CDOMand detrital matter. We merged satellite data from multiple satellite sensors and created a 19 year time series (1997-2015) of NPP. During this period, both the estimated annual total and the summer monthly maximum pan-Arctic NPP increased by about 47%. Positive monthly anomalies in NPP are highly correlated with positive anomalies in open water area during the summer months. Following the earlier ice retreat, the start of the high-productivity season has become earlier, e.g. at a mean rate of -3.0 d yr(-1) in the northern Barents Sea, and the length of the high-productivity period has increased from15 days in 1998 to 62 days in 2015. While in some areas, the termination of the productive season has been extended, owing to delayed ice formation, the termination has also become earlier in other areas, likely owing to limited nutrients.

DOI10.1098/rsbl.2016.0223
Short TitleBiol. Lett.
Student Publication: 
No