• Issue
    Volume 29, Issue 10
    i-iv, 1567-1853
    October 2015

Issue Information

Free Access

Issue Information

  • Pages: i-iv
  • First Published: 11 November 2015

Research Articles

Free Access

Responses of carbon uptake and oceanic pCO2 to climate change in the North Atlantic: A model study with the Bergen Earth System Model

  • Pages: 1567-1583
  • First Published: 29 August 2015
Key Points

  • The subpolar and subtropical gyre regions show substantially different responses to climate change
  • The subpolar CO2 uptake reduction is driven by biogeochemical processes
  • Relatively small contribution differences can shift the effects of climate change on regional scale

Free Access

Intense nitrogen cycling in permeable intertidal sediment revealed by a nitrous oxide hot spot

  • Pages: 1584-1598
  • First Published: 03 September 2015
Key Points

  • Nitrous oxide is produced by microorganisms in barrier island beach sand
  • Nitrous oxide production is correlated with nitrate reduction
  • Microbial processes in barrier island aquifers are an important nitrogen sink

Free Access

Controls on biogenic silica burial in the Southern Ocean

  • Pages: 1599-1616
  • First Published: 07 September 2015
Key Points

  • Biogenic Si burial south of 40°S is 2.3 ± 1.0 Tmol per yr
  • Maximum opal burial decreases with increasing number of ice-covered days
  • In ice-free regions, opal burial increases with increasing silicic acid

Free Access

Biogenic carbon fluxes from global agricultural production and consumption

  • Pages: 1617-1639
  • First Published: 08 September 2015
Key Points

  • Global crop NPP in 2011 was 5.25 Pg C with 2.05 Pg C harvested
  • Livestock intake in 2011 was 2.42 Pg C with 52% foraged from noncropland
  • Global cropland budget accounts for approximately 80% of harvested carbon

Free Access

Seasonal and interannual variability of sea-air CO2 fluxes in the tropical Atlantic affected by the Amazon River plume

  • Pages: 1640-1655
  • First Published: 09 September 2015
Key Points

  • CO2 undersaturation in the Amazon River plume supported by biological activity
  • The area is a net sink of atmospheric CO2
  • Positive temperature anomalies led to CO2 outgassing in the NEC in 2010

Free Access

Climatological distribution of aragonite saturation state in the global oceans

  • Pages: 1656-1673
  • First Published: 18 September 2015
Key Points

  • Climatological aragonite saturation in surface and subsurface global oceans are presented
  • Mechanisms controlling aragonite saturation state distributions are discussed
  • Subannual and decadal changes of aragonite saturation state are presented

Free Access

Recent decadal trends in global phytoplankton composition

  • Pages: 1674-1688
  • First Published: 23 September 2015
Key Points

  • Fifteen year assimilated ocean color observations show global decline in diatoms
  • Regional and global diatom decline coincide with changes in physics and nutrients
  • Evidence of regional shifts in phytoplankton composition

Free Access

Coupling atmospheric mercury isotope ratios and meteorology to identify sources of mercury impacting a coastal urban-industrial region near Pensacola, Florida, USA

  • Pages: 1689-1705
  • First Published: 18 September 2015
Key Points

  • Isotopic composition of TGM differed among meteorologically identified sources
  • Background atmospheric TGM displayed moderately positive δ202Hg values
  • Anthropogenic emissions drive TGM isotopic composition to lower δ202Hg values

Free Access

Anthropogenic CO2 uptake, transport, storage, and dynamical controls in the ocean imposed by the meridional overturning circulation: A modeling study

  • Pages: 1706-1724
  • First Published: 21 September 2015
Key Points

  • Three-dimensional carbon budget is estimated using a biogeochemical model
  • Subtropical cells are important for determining the anthropogenic CO2 budget
  • Anthropogenic CO2 budget in mode waters is also discussed

Free Access

Dissolved organic carbon pools and export from the coastal ocean

  • Pages: 1725-1738
  • First Published: 22 September 2015
Key Points

  • Global DOC export from coastal ocean to the open ocean varied between 4.4 to 27.0 Pg C yr−1
  • Global DOC export is consistent with regional estimates

Open Access

Disentangling the contribution of multiple land covers to fire-mediated carbon emissions in Amazonia during the 2010 drought

  • Pages: 1739-1753
  • First Published: 08 September 2015
Key Points

  • The 10.77% (96,855 km2) of MT burned during the 2010 dry season
  • Mato Grosso gross c emission in 2010 was 56.21 ± 22.5 Tg C
  • Old-growth forest fire emission in 2010 in the Brazilian Amazon was 14.81 Tg C

Free Access

Leaky nitrogen cycle in pristine African montane rainforest soil

  • Pages: 1754-1762
  • First Published: 02 October 2015
Key Points

  • First investigation of gross soil N dynamics in tropical forest in Africa
  • Reinforce that tropical montane forests are not generally N limited
  • Open N cycle driven by nitrification and low immobilization of mineralized N

Free Access

Surface distribution of dissolved trace metals in the oligotrophic ocean and their influence on phytoplankton biomass and productivity

  • Pages: 1763-1781
  • First Published: 23 September 2015
Key Points

  • The distribution of trace metals in waters of the global ocean was determined
  • No multiyear variation in the distribution of trace metals in the Atlantic Ocean was observed
  • Some metals correlate with primary productivity, suggesting potential metal limitation

Free Access

Explicitly representing soil microbial processes in Earth system models

  • Pages: 1782-1800
  • First Published: 22 September 2015
Key Points

  • Microbial-explicit models differ in predictions from conventional models
  • Applying microbial-explicit models may improve global C cycle projections
  • Spanning microbial to global scales requires integrative model-data approaches

Open Access

Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming

  • Pages: 1801-1815
  • First Published: 05 October 2015
Key Points

  • Deep ocean oxygen overshoots pre-industrial condition under 2 and 4 × CO2 level
  • Enhanced deep convection in the Weddell Sea cause global deep ocean oxygenation
  • Warming and slow freshening of deep water cause enhanced deep convection

Free Access

The mutual importance of anthropogenically and climate-induced changes in global vegetation cover for future land carbon emissions in the MPI-ESM CMIP5 simulations

  • Pages: 1816-1829
  • First Published: 24 July 2015
Key Points

  • Future natural vegetation change can mitigate CO2 emissions from LULCC
  • Possible interdependencies between future natural vegetation changes and LULCC
  • The refilling of carbon pools after stopping LULCC takes century time scales

Open Access

Nutrient cycling in the Atlantic basin: The evolution of nitrate isotope signatures in water masses

  • Pages: 1830-1844
  • First Published: 05 October 2015
Key Points

  • Atlantic N cycling processes investigated using dual nitrate isotopes
  • N recycling and high N:P remineralization observed in subtropics from N fixation
  • NADW isotope signatures affected by subtropical Atlantic N recycling

Open Access

Coralline algae as a globally significant pool of marine dimethylated sulfur

  • Pages: 1845-1853
  • First Published: 29 September 2015
Key Points

  • Coralline algae, globally ubiquitous ecosystem engineers, harbor a large pool of dimethylated S
  • Latitude drives global-scale spatial variation
  • Temperature drives local-scale temporal variation