Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current.

Song, Hajoon, Long, Matthew C., Gaube, Peter, Frenger, Ivy, Marshall, John and McGillicuddy Jr., Dennis J. (2018) Seasonal variation in the correlation between anomalies of sea level and chlorophyll in the Antarctic Circumpolar Current. Open Access Geophysical Research Letters, 45 (10). pp. 5011-5019. DOI 10.1029/2017GL076246.

[img]
Preview
Text
2018_song_grl_accepted.pdf - Accepted Version

Download (1829Kb) | Preview
[img] Text
Song_et_al-2018-Geophysical_Research_Letters.pdf - Published Version
Restricted to Registered users only until 30 November 2018.

Download (3800Kb)

Supplementary data:

Abstract

The Antarctic Circumpolar Current (ACC) has highly energetic mesoscale phenomena, but their impacts on phytoplankton biomass, productivity, and biogeochemical cycling are not understood well. We analyze satellite observations and an eddy‐rich ocean model to show that they drive chlorophyll anomalies of opposite sign in winter versus summer. In winter, deeper mixed layers in positive sea surface height (SSH) anomalies reduce light availability, leading to anomalously low chlorophyll concentrations. In summer with abundant light, however, positive SSH anomalies show elevated chlorophyll concentration due to higher iron level, and an iron budget analysis reveals that anomalously strong vertical mixing enhances iron supply to the mixed layer. Features with negative SSH anomalies exhibit the opposite tendencies: higher chlorophyll concentration in winter and lower in summer. Our results suggest that mesoscale modulation of iron supply, light availability and vertical mixing plays an important role in causing systematic variations in primary productivity over the seasonal cycle.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2017GL076246
ISSN: 0094-8276
Projects: MOBY
Date Deposited: 29 May 2018 11:34
Last Modified: 07 Aug 2018 09:16
URI: http://oceanrep.geomar.de/id/eprint/43177

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...