Summer upwelling at the Boknis Eck time series station (1982 to 2012) - a combined glider and wind data analysis.

Karstensen, Johannes , Liblik, Taavi, Fischer, Jürgen , Bumke, Karl and Krahmann, Gerd (2014) Summer upwelling at the Boknis Eck time series station (1982 to 2012) - a combined glider and wind data analysis. Open Access Biogeosciences (BG), 11 . pp. 3603-3617. DOI 10.5194/bg-11-3603-2014.

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Abstract

Two consecutive summer upwelling events, each lasting for less than 24 h, were surveyed in high temporal and vertical resolution close to the Boknis Eck time-series station (BE) in the western Belt Sea (Baltic Sea) in summer 2010 with an autonomous glider. Driven only by moderate offshore winds both events resulted in more than 5 K cooling of surface waters, while only for the second event were significant irreversible changes in the vertical stratification observed. Generalizing the glider survey observations with hourly wind data from nearby meteorological stations, it is found that upwelling in the BE area occurs for wind directions between 190 to 260° and wind speed exceeding 4 m s−1. Based on these thresholds the wind-induced summer (June to September) upwelling conditions in the BE area for the period 1982 to 2012 are reconstructed. On average about 18 days of upwelling favourable wind conditions are found for the four summer months, with significant interannual variability ranging from 7.7 days (2006) to more than 28 days (1985). By aligning upwelling favourable wind conditions with the monthly BE surveys it is found that extreme anomalies in BE surveys follow extended periods of upwelling favourable winds.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/284321
Additional Information: WOS:000339265800010
Keywords: Polarfuchs
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-11-3603-2014
ISSN: 1726-4170
Projects: GROOM, EGO-COST, Boknis Eck, Future Ocean
Date Deposited: 19 Feb 2014 07:49
Last Modified: 04 Dec 2014 10:52
URI: http://oceanrep.geomar.de/id/eprint/23647

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