Quantifying the time lag between organic matter production and export in the surface ocean: Implications for estimates of export efficiency

Stange, Paul, Bach, Lennart T., Le Moigne, Frederic A. C., Taucher, Jan, Boxhammer, Tim and Riebesell, Ulf (2017) Quantifying the time lag between organic matter production and export in the surface ocean: Implications for estimates of export efficiency Geophysical Research Letters, 44 (1). pp. 268-276. DOI 10.1002/2016GL070875.

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Abstract

The ocean's potential to export carbon to depth partly depends on the fraction of primary production (PP) sinking out of the euphotic zone (i.e., the e-ratio). Measurements of PP and export flux are often performed simultaneously in the field, although there is a temporal delay between those parameters. Thus, resulting e-ratio estimates often incorrectly assume an instantaneous downward export of PP to export flux. Evaluating results from four mesocosm studies, we find that peaks in organic matter sedimentation lag chlorophyll a peaks by 2 to 15 days. We discuss the implications of these time lags (TLs) for current e-ratio estimates and evaluate potential controls of TL. Our analysis reveals a strong correlation between TL and the duration of chlorophyll a buildup, indicating a dependency of TL on plankton food web dynamics. This study is one step further toward time-corrected e-ratio estimates

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/228224 ; info:eu-repo/grantAgreement/EC/FP7/211384
Keywords: carbon export; biological pump; time lag; mesocosm; export efficiency; plankton community
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2016GL070875
ISSN: 0094-8276
Projects: KOSMOS, BIOACID, SOPRAN, MESOAQUA, EPOCA
Expeditions/Models/Experiments:
Date Deposited: 09 Jan 2017 08:15
Last Modified: 08 Jun 2017 07:29
URI: http://oceanrep.geomar.de/id/eprint/35505

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