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Phytoplankton competition during the spring bloom in four Plankton Functional Type Models
(2012)Biogeosciences DiscussionsWe investigated the mechanisms of phytoplankton competition during the spring bloom,one of the most dramatic seasonal events in lower-trophic level ecosystems, in fourstate-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, Plank-TOM5 and CCSM-BEC. In particular, we investigated the relative importance of dif-5ferent ecophysiological processes on the determination of the community structure,focusing both on the bottom-up ...Working Paper -
Global ocean carbon uptake: Magnitude,variability and trends
(2012)Biogeosciences DiscussionsEstimates of the anthropogenic global-integrated sea-air carbon dioxide (CO2) fluxfrom 1990 to 2009, based on different models and measurements, range from−1.4to−2.6 PgC yr−1. The median values of anthropogenic CO2for each method showbetter agreement and are:−1.9 for Pg C yr−1for numerical ocean general circulation hind cast models (OGCMs) with parameterized biogeochemistry;−2.1 PgC yr−1for at-mospheric inverse models;−1.9 PgC yr−1for ...Working Paper -
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Spatiotemporal variability and long-term trends of ocean acidification in the California Current System
(2012)Biogeosciences DiscussionsDue to seasonal upwelling, the upper ocean waters of the California Current System (CCS) have a naturally low pH and aragonite saturation state (Ωarag), making this region particularly prone to the effects of ocean acidification. Here, we use the Regional Oceanic Modeling System (ROMS) to conduct preindustrial and transient (1995–2050) simulations of ocean biogeochemistry in the CCS. The transient simulations were forced with increasing ...Working Paper -
Global ocean storage of anthropogenic carbon
(2012)Biogeosciences Discussionshe global ocean is a significant sink for anthropogenic carbon (Cant), absorbing roughly a third of human CO2 emitted over the industrial period. Robust estimates of the magnitude and variability of the storage and distribution of Cant in the ocean are therefore important for understanding the human impact on climate. In this synthesis we review observational and model-based estimates of the storage and transport of Cant in the ocean. We ...Working Paper -
Global marine plankton functional typebiomass distributions: coccolithophores
(2012)Earth System Science Data DiscussionsCoccolithophores are calcifying marine phytoplankton of the class Prymnesiophyceae. They are considered to play an import role in the global carbon cycle through the production and export of organic carbon and calcite. We have compiled observations of global coccolithophore abundance from several existing databases as well as individual contributions of published and unpublished datasets. We make conservative estimates of carbon biomass ...Working Paper -
MAREDAT: towards a world atlas of MARine Ecosystem DATa
(2012)Earth System Science Data DiscussionsWe present a summary of biomass data for 11 Plankton Functional Types (PFTs)plus phytoplankton pigment data, compiled as part of the MARine Ecosystem biomassDATa (MAREDAT) initiative. The goal of the MAREDAT initiative is to provide global gridded data products with coverage of all biological components of the global ocean ecosystem. This special issue is the first step towards achieving this. The PFTs presented here include picophytoplankton, ...Working Paper -
Effect of photochemical aging on the ice nucleation properties of diesel and wood burning particles
(2012)Atmospheric Chemistry and Physics DiscussionsWorking Paper -
The MAREDAT global database of high performance liquid chromatography marine pigment measurements
(2012)Earth System Science Data DiscussionsA global pigment database consisting of 37103 pigment suites measured by high performance liquid chromatography was assembled in support of theMARineEcosytemDATa (MAREDAT) initiative. These data originate from 136 field surveys within theglobal ocean, were solicited from investigators and databases, compiled, and then quality controlled. Nearly one quarter of the data originates from the Laboratoired’Océanographie de Villefranche (LOV), ...Working Paper -
Flux correction for closed-path laser spectrometers without internal water vapor measaurements
(2012)Atmospheric Measurement Techniques DiscussionsRecently, instruments became available on the market that provide the possibility toperform eddy covariance flux measurements of CH4and many other trace gases, in-cluding the traditional CO2and H2O. Most of these instruments employ laser spec-troscopy, where a cross-sensitivity to H2O is frequently observed leading to an increased dilution effect. Additionally, sorption processes at the intake tube walls modifyand delay the observed H2O ...Working Paper