FN Archimer Export Format
PT J
TI Sparse observations induce large biases in estimates of the global ocean CO2 sink: an ocean model subsampling experiment
BT 
AF HAUCK, Judith
   NISSEN, Cara
   LANDSCHUETZER, Peter
   ROEDENBECK, Christian
   BUSHINSKY, Seth
   OLSEN, Are
AS 1:1;2:1,2,3;3:4;4:5;5:6;6:7,8;
FF 1:;2:;3:;4:;5:;6:;
C1 Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
   Department of Atmospheric and Oceanic Sciences, Boulder, CO, USA
   Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA
   Flanders Marine Institute (VLIZ), Ostend, Belgium
   Max Planck Institut für Biogeochemie, Jena, Germany
   School of Ocean and Earth Science and Technology, University of Hawai’i at M¯anoa, Department of Oceanography, Honolulu, HI, USA
   Geophysical Institute, University of Bergen, Bergen, Norway
   Bjerknes Centre for Climate Research, Bergen, Norway
C2 INST A WEGENER, GERMANY
   UNIV COLORADO BOULDER, USA
   UNIV COLORADO BOULDER, USA
   VLIZ, BELGIUM
   MAX PLANCK INST BIOGEOCHEM, GERMANY
   UNIV HAWAII MANOA, USA
   UNIV BERGEN, NORWAY
   BCCR, NORWAY
IF 5
TC 17
UR https://archimer.ifremer.fr/doc/00842/95423/103231.pdf
   https://archimer.ifremer.fr/doc/00842/95423/103232.pdf
LA English
DT Article
CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
DE ;carbon dioxide;ocean carbon sink;pCO(2) observations;observation system design
AB Estimates of ocean CO2 uptake from global ocean biogeochemistry models and pCO(2)-based data products differ substantially, especially in high latitudes and in the trend of the CO2 uptake since 2000. Here, we assess the effect of data sparsity on two pCO(2)-based estimates by subsampling output from a global ocean biogeochemistry model. The estimates of the ocean CO2 uptake are improved from a sampling scheme that mimics present-day sampling to an ideal sampling scheme with 1000 evenly distributed sites. In particular, insufficient sampling has given rise to strong biases in the trend of the ocean carbon sink in the pCO(2) products. The overestimation of the CO2 flux trend by 20-35% globally and 50-130% in the Southern Ocean with the present-day sampling is reduced to less than 15% with the ideal sampling scheme. A substantial overestimation of the decadal variability of the Southern Ocean carbon sink occurs in one product and appears related to a skewed data distribution in pCO(2) space. With the ideal sampling, the bias in the mean CO2 flux is reduced from 9-12% to 2-9% globally and from 14-26% to 5-17% in the Southern Ocean. On top of that, discrepancies of about 0.4 PgC yr(-1) (15%) persist due to uncertainties in the gas-exchange calculation.This article is part of a discussion meeting issue 'Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities'. 
PY 2023
PD JUL
SO Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences
SN 1364-503X
PU Royal Soc
VL 381
IS 2249
UT 000983226900002
DI 10.1098/rsta.2022.0063
ID 95423
ER

EF